I have two of the seplos bms v3.0 with the active balancer setup, the v0.7 tracks soc really well now compared to v0.6, it now tracks in line with my lynx shunt, there is still an issue with the reset as you mentioned, this is more to do with the current resolution at the top end. The active balance communication is only a turn on the balancer , it is not communicating or allowing configuration of the active balancer, you either need to put it into standby for 10 hours with the button or the BMS will trigger the dry contact on over voltage alarm, it then needs the preset values to be met to start balancing which is 50ms differential down to 30ms differential then your on the BMS passive balancer. I have bought some neey to try instead.
Thanks for sharing. I have the total opposite experience with SOC being accurate. I will show this in the next video. It basically stops counting SOC below 6% and above 98.5% and therefore loses track.
@@OffGridGarageAustralia I unfortunately cant post a picture, I upgraded on the 13th March and it was tracked near enough to be useful in my production environment that I felt comfortable to switch from the Lynx shunt to the Seplos BMS at the Battery monitor it has drifted slightly over time without an 100% reset it is currently 56% seplos vs 58.8% lynx shunt after 20 days of partial cycling but this is for me down to the difference in resolution 0.1 vs 0.8 x 2 Seplos BMS's obviously worse the more you scale out the batteries. I need some of your sunny weather and Amps outside to get some more 100% resets :-) I will email you some of the VRM graphs as they show it nicely. Thanks for the testing as always, I look forward to a good OGG video! Be interesting to see if the Peter Can bus system would help, I suspect as the Peter system will be presented with the wrong SoC data the problem would be the same....
@@richardnorman7132 Thanks, got your email and data... I'll email you some sun☀😊 The Peter board will only relay what data they get from the BMS. So hence it is important for the BMS to calibrate back to 100% when the battery is considered fully charged. At least once in a while. You probably will notice as well that the drift between shunt and BMS will only increase over time without proper reset. Yes, resolution plays a role here if you have these small loads and contributes to the drift.
Nice update! Thanks. I got seplos v3 bms with 2a active balance. It actual work good some limitations. -It comes with a dedicated switch to turn it off or on -it also have a connection to the dry contact of the bms to trigger the balance voltage. The limitation is that the balance voltage is not good not from 3.45v. The good side is that it has a dedicated switch that you can turn on it off. I only use it to balance pack and it will be off until next event I’ve unbalanced pack. Seplos would need to redesign their active balance I would like you test the active balance too.
Thank you. I have seen this switch at the bac of their vertical battery and was wondering if this is just a manual overwrite of the automation. Has the Seplos BMS relay contacts? Can't remember, but the Polo batteries don't have them exposed to the outside.
Andy, the SOC calculation was wrong with previous firwmare (but now, you already updated it ^^, it's too late to show the mistake ;) only during discharge. With Cristof48 and myself, we identified the issue, and forced Seplos to update ; now, the SOC calculation is great, but no more feature has been added, you're right.
@derfreiemensch good question. My main reason is for active balancing, the passive balancing, whilst it works, and technically burns of energy, as I understand. Whilst my cells are grade A, and always within 2mv variance, I still need the faster active balancing when there is a lot of amps being charged.
Hello from California I’m doing a repurpose of a ford fusion hybrid battery for my solar power bank. Any tips would be great. Love your channel and your knowledge to help others. Cheers my friend PS I’m 100% off grid living in my RV on a undisclosed location
Hi Andy. I have the Seplos BMS v3 with its 2A Active Balancer. I ended up by disconnecting the Seplos Active Balancer, replaced by a NEEY 4A unit. Synthesis of the reasons : the balancer cannot be configured, nor monitored. Details (coming from my own tests & talks with Seplos support guys): A) The balancer triggers by itself when the cells voltage difference is greater than 50mv and from 3v. That is the way the balancer is "autonomous" and can be used with any BMS => unfotunately those settings are hard coded in the balancer and CANNOT be changed (far too low trigger point for me). B) the dry contact connectiting with the Seplos BMS brings "some" control through settings 100 & 101, which are cells voltage delta based with stupidly high default settings : triggers when the delta is over 500mV and stops when delta is 300mV) => while this gives a kind of setting to control the active balancer this is far insufficient and does not solve the 3v start point from A). C) no way to know when and if this active balancer actually works, out of looking at its (blinking) led on the electronic board (or the one on its reset button) => a big lack for those monitoring things a bit/connecting to home assistant or similar. NEEY 4A does the job perfectly and replaced the Seplos active balancer in my vertical Seplos box (and it fits fine in it :)) As for the SOC from the Seplos BMS, I ended up trying to use it (I totally disklike to overvoltage thing to reach 100% + found it globally inaccurate and not reliable) and bought a Victron Smartshunt to get such information (and in a way I can exactly master what is 100% and what is 0%)
@@kchiem No trouble to connect... on a daily basis, the remote monitoring is actually done by an ESP32, which connects to the NEEY using BT and sending data through MQTT/Wifi to Home Assistant. I am getting a really reliable connection.
Thank you so much for sharing. That is very valuable information. Especially, how the BMS 'controls' the balancer. I was hoping it activates the active balancer when the passive balancer on the BMS comes on, but this does not seem to be the case. It's a shame that Seplos misses all these opportunities to build good and reliable devices. I really like their BMS but the software is just not really usable. I'm still testing their V3 BMS with my PowerWall 2.0 but found it needs a lot of tweaked parameters to work some kind of... So, hopefully, I can convince their engineers and R&D team to improve the software. But even little changes take a long time if they even get approved...
@@OffGridGarageAustraliaunfortunately there is no use of the passive balancer settings and both are living their live in parallel, blindly at some point. Seplos would be able to update the software on the bms to change the way they trigger the active balancer through the dry contact, but this would works only if there is a way to disable the active balancer « self trigger hard coded settings » (otherwise it will continue to activate from 3v), which seems unlikely for the units already produced (unless there is an hidden way to update the active balancer Seplos did not tell me about )
No idea, Seplos didn't mentioned any of that... I just use 4851 and it works... I think it has something to do with the automatic setting of master and slave addresses.
Seplos 2A Active Balancer. At US$100 it is too expensive. IF it was truly SMART and connected to the BMS in an intelligent way, where the settings could be accessed/changed via BT. Yes, I could see that being useful. Most of the time, the passive balancing of the BMS is OK, and the active balancer is not needed. If you had correctly top balanced a pack when new, there is a good chance you would not need an active balancer very often, so a power switch on the outside of the battery box would be a good idea. Your cheap balancer solution works fine for me on my V2 BMS's.
I think Seplos has such a switch on their vertical box to power on the active balancer (I've seen it in their video). It also turns on automatically, when the delta is over 50mV.
After 1,5 year running the old v2.9, I'm done with seplos. I wanted to upgrtade my 5 packs to the new v3, but there support is so bad, I'll go with the new jk, it can't be more worse.
Yes, the innovation of their BMS is not great. JK is doing so much better. I have swapped the V2.9 with the JK BMS in one of my batteries already. It's a lot of work because nothing fits and is compatible like in the batteries with Pace BMS. The v2.8 was actually a lot better than 2.9 and worked surprisingly well. It even resets to 100% all the time reliably.
BTW Andy, I have received the USB to RS485 ordered following your link but I'm afraid I could not connect to my Seplos 200E on port 1 (or2). I was trying to verify that it is the correct one but cannot remember in which video you posted the link.
Hello. I've done the same and the adapter is good and working,but not perfect unfortunately. I've ordered according to Andy's link from his webpage. The windows found the driver without the need of installing drivers, but was unable to connect. I've searched for seplos BMS connection schematics and for usb/rs485 adapter schematics, but nothing helped. Finally I decided to switch data A and data B cables. I made it on wire 1 and 2 (orange/white orange) but it didn't helped me at all. So I try the same on wire 7 and 8 (brown/white brown). So the final solution was to interrupt the wires 1 and 2 and to switch(exchange) wires 7 and 8. I've used some wago clamps just to give it a try and finally let it be like that. Now it works like a charm.
@@peterpanacik2708 I think I was using 7 & 8 in my connection but I'll have to check again and I never used any other of the wires. Did you have to invert 7 & 8? Swapping one for the other?
@@9111logic according to the seplos manual the Seplos V3 uses the RJ45 connector with active pins 1,2,3 and 6,7,8 in mirror configuration. 1, 2, 7,8 are data lines and 3,6 are ground lines I don't know why they use ground wires/lines with rs485 as it is floating communication,but any way.... According to standard data A and data B should be enough. Anyway. There are two ways to do it. 1.) Either you are going to crimp your own cable, so you need to make cable connection Seplos site pin7-adapter site pin8 (should also work with mirror application Seplos site pin2-adapter site pin1) for dataA and Seplos site pin8-adapter site pin7 (should also work with mirror application Seplos site pin1-adapter site pin2) for dataB. You can use GND connection just to be sure Seplos site pin 6-adapter site pin6(mirror configuration pin3 -pin3) OR 2.) you can miss the RJ45 connector as I was, or be lazy to crimp,or anything else, so you will use a standard RJ45 patch cable, put away 15cm long piece of upper insulation so you will see twisted wires, cut(interrupt) orange and whiteorange cables, and cut and interconnect brown cable with brownwhite and vice versa. It's hard to describe. It's a matter of one single drawing. Hope you have understood all the descriptions and it will help you to successfully connect to your BMS ;) .
Hi Andy, the two charging methods used by seplos bms v2 and v3 are working perfectly. Also the reset to 100% works perfectly in both cases. The embedded passive balancing system is great and it's able to balance all cells even after several days away from the full charge. I left several comments aroud 6 months ago on how to make it working in both methods... Peppe from Napoli.
Ah, here is Peppe again. Seplos always works for him apparently, despite me testing the exact opposite. Share your settings, my friend and tell us a bit more about WHAT is actually working... I assume you use OVP to control charging... The balancer is a joke as we have seen multiple times.
I currently have a set of 5 x 100Ah batteries in parallel for EV charging. There are 3 Seplos Polo with bms V3 model V10 and firmware 0.7, one Orient Power with Pace bms, and one Power Quenn with a JK bms (I changed it). Before the update to 0.7, the SOC calculation was catastrophic, I had a difference of 40% at the end of discharge between Seplos and the other bms. In Charge, the Seplos reached 98.5% very quickly when the others were at around 60%. Now, with version 0.7 the gap has been reduced, the SOC indication between the JK and the seplos is approximately identical, and the Pace SOC with a difference of around 7%. At the end of the charge, the Seplos show a cell imbalance of approximately 40 to 50 mv. Do you know why Seplos quickly abandoned the marketing of Polo-type models? is it because of the pouch cells ?
You're working with Cyrille, right? I think I have seen your video in French when you tested the three Seplos and the SOC was all over the place. Thanks for sharing these results of the three BMS, very interesting. I don't know why they discontinued the Polo series. I think it was a good battery design but maybe too expensive to manufacture for them due to the round curves it had. There is a lot of competition out there in this 48V100Ah segment. I don't think the pouch cells had any issues as they were perfectly compressed in their own little fixture inside the box.
They definitely bailed on the pouch cells. This really confused me when I first started looking at the wall mount battery first called the Polo-L, and then Polo L-208, and now 104-L. Seplos marketing can’t decide what to call it and I was confused because the Polo-L used pouch cells but the Polo 208-L / 104-L uses prismatic cells.
Hello Andy. Thank you for the great video again. If I remember right, you used to have a seplos config printscreen published at your website/my settings. Now mainly JK settings are there. Can you please add config for Seplos V3 you used in this video for example? Maybe printscreen, maybe a direct config file to download ;) thank you. Greetings from Slovakia ;)
Hi Andy, but I also have the problem with the new JK BMS that my battery stays at the requested charging voltage the whole time and doesn't go into float mode. The reason is that with an RCV of 55.2V only 55.11V is reached and the inverter does not increase the voltage any further. This means that the trigger for switching to float mode is not triggered. I think it is due to a calibration problem. I tried setting the 55.11V as 55.2V but the next time I charge the voltage is still below 55.2V. Neither JK nor Goodwe have responded to a request so far. The firmware is the latest x.11. Perhaps you can look into the topic of calibration. Or someone from the community knows the problem and has a solution. Best regards Andeas
Yes, correct. if your inverter does not have a charge voltage offset, it won't work with any BMS. Your inverter measures differently to the BMS. You can only calibrate the BMS as per your inverter to make it work. Victron has the SVS - Shared Voltage Sense which shares the same voltage across all devices.
Hi Andy ! love your channel ! I’m planning to build my own DIY LFP battery soon … What do you think it’s the best choice ? Jk BMS ? or a Seplos BMS with a separate active balancer ? the best quality/price/ beginner proof choice ? thanks for your work !
Strange, whenever I need to disconnect the Seplos Can Comm I go to the MPPT in my Cerbo where it says "Charge controlled by BMS" and press reset to return to MPPT controlled. Sometimes though it resets the Lynx battery status display to 0% and if I then reset to 100% and manually type the correct previous value, the system does not come to a halt. If, on the contrary, I wait too long, then Lynx thinks the battery is dead and shuts down the inverters and puts the MPPTs in float.
Yeah, the MPPTs have this option but not the Multiplus. And even with the 4 MPPTs, I have to be quick otherwise their comms times out and report a BMS communication lost which ends in a shutdown of the system. It's not ideal, I wish Victron would have single toggle somewhere to either us MPPT charging or external BMS.
@@OffGridGarageAustralia Let's hope that they introduce a single command for all MPPTs, I have two now so I will have the same problem as soon as I commission the second one.
@@9111logic I have never managed to turn off the External Control in all 4 MPPTs I have, Before one of them throws the error and shuts everything down. I'm not expecting, Victron will ever introduce such a switch in Venus. Normally, once you got a BMS connect, you stay connected and don't switch back to MPPT Mode. This is more for us 'tinkerer'...
@@OffGridGarageAustralia Unfortunately I had problems keeping the two different batteries running smoothly when the Seplos-based 304 A pack was connected to Venus via Can bus. Odipie technicians cannot help with the rs485 nor the Can of the smaller 100A so I am currently running them controlled by the MPPT until I can build the second 304 A unit. This way they tag along nicely.
Andy this 30min timer only works With a higher voltage. Try 56.8V Pack overvoltage protection and also let all settings as there is pre Set from the factory. Cell ov warn 3.5V cell ovp at 3.65V. For me this works every Day. I tried first with the 3.45V but this Has Not worked for me.
@@betterlifeacademy1744 I think, we have tested all that already back when we had a comprehensive look at the Seplos V3 BMS. Links are in the video description.
Andy I'm running 2 x Seplos3 v0.6 BMS's without active balancers, each controlling 16 x 280Ah cells and I dont have the 99.9% issue you're having, my batteries charge to 100% perfectly every time. I'm also running Victron with a Cerbo GX but Im 3 phase and have feed-in turned on for exporting, everything is working as it should. Let me know if you want to compare settings.
After you have completed setting up and you have done the work. Do you start doing a maintenance check every day, week, month, or just set back for an alarm ‼️? You did say a couple of days. But you do have new equipment that will keep you busy. But you’re primarily system we see very little work done on them.
I check them on an hourly base, haha. Seriously, I'm going to build a better test setup soon where we can test all kind of batteries and also inverters. Yes, there is still heaps of equipment waiting and so many videos to come...
Heya, nice test so it seems that the new firmware doesn't work better as the older version's that's to bad would be nice if you would see some progress.
I wouldn't disconnect the comms, but the displayed SOC is still off quite a bit in the BMS and unreliable. At the moment, there is no working solution to get the BMS reset to 100% when fully charged without hitting the overvoltage protection. This is a bad design and less than ideal. I'm working with Seplos on this but I can't see any progress or even a fix...
But if coms kept then surly voltage will remain (as you said @34 mins ) unnecessarily high voltage all day. Can you keep coms but just use the batteryshunt for SOC? I have victron MP2 15kva on the way to replace growatts and have 4 x 14.3kw V3 seplos mason kits. would really like to know best way to set these up with Victron @@OffGridGarageAustralia
@@giollaliddy5817 Yes, that is probably the best way to run the system: set the BMS as the controlling BMS and ignore their SOC calculation. Leave the smart shunt as the battery monitor for your whole system.
My experiance is that the alarm*16 for 30min is still not working. I would really like this feature as it makes it posible to balance the pack a little. The V0.7 have improved the SOC measureing. On V0.6 the SOC could just suddenly drop from 40 to 0 when it realize that the voltage is too low. I have also played with the active balancer. Im not impressed. Its relay based, so you can hear the "clicking". The remote "dry contact" from bms did not turn on. I could only turn it on manually by pressing a switch. Maybe its better with the v0.7 firmware. Compaired with Neey, its a dinosaour balancer with all the relays 🤣.
Thanks so much for sharing. I have not read any positive comment about this balancer so far. I know the technical details and how and when it activates, but yeah definitely a 🦖
Hi Andy, please can you do a video about SOC displays, I have 2 jk 200amp BMS working on 304an EVE batteries. The soc goes up and down with no real relationship to the actual soc. One set is powering a gwiz electric car and the other is running the house. It will often say to low or to high, resetting the BMS battery ah figure will bring it back to what is closer to the actual Soc. I want a display i can rely on.😮 Ideas please, the best Soc display 👍 Thanks Ellis
I have two JK BMS running for a very long time and they both show the SOC correctly. Sure, they need calibrating from time to time, but once set, it does it all automatically. What do you mean by 'the soc goes up and down'. Got an example?
Thanks for the reply, so for example today the soc said 89%, resetting the ah it now says 73%. An even better example is it showed a similar voltage but only 3%😂 I will add some screenshots 👍
Andy, does the 100% soc need to be hit to record a cycle or does the bms add the totals up to make a full cycle? Like a discharge limit of 40% and a charge limit of 80%?
The BMS counts Ah in and out and uses that to calculate the cycles. The 100% is really just a display. You won't believe how many emails I'm getting from people asking why their battery never charges to 100%😊
Part 2 can't come quick enough for me, as usual I am in the 💩with my system, I have "Another Brick on the Wall" and I might be needing a bms upgrade asap. My new SOFAR HYD inverter won't work with my old version jk or user defined settings(lead acid). I get a constant BatOVP ID070 fault. Any SOC and any setting 😭😭😭 Thanks for the info Andy. Shine on Cheers Gaz 🏴
You've got a lot of trouble with your system. Have you made this drawing with all your connections so you can systematically find the issue? Get a big piece of paper and go...
@@OffGridGarageAustralia I did do that but this is a different inverter mate. We got a refund on the naughty LUX POWER it was definitely faulty. This SOFAR SOLAR HYD inverter registers the ct clamp, load, pv and battery voltage but alarms out with a Batt over voltage protection. SOFAR Tech support is useless. Turn it off and on again or buy a ready made compatible battery. They clearly have no time for DIY Even the Lead acid setting with my bench power supply it still alarms out at any voltage or charge setting it alarms out. Thanks mate after your latest series I have ordered a JK inverter BMS. If after this it don't work, I quit.
On my sailboat i need to switch my batteries for 16S 280Ah LiFepo4. But due to room restrictions i need to distribute the cells in 4 packs of 4. What is the best way? For balance cables a take thicker ones and all of the same length. But what about spreading those 4 packs? Just the cheaper bus bars as well as 2x70mm2 cables as short as possible between packs to keep the resistance between any 2 cells similar? Or does it make any difference because current needs to flow across all cells anyway?
I wouldn't be too concerned, especially not about the balance cables. Standard size and different lengths should be fine as there is no current going through them. The interconnections... 70mm is a great option but at 100A you will see a voltage drop and a cell difference because of that. That could be a problem. What BMS do you use?
Download and Upload is defined by its topology. You DOWNLOAD a programm into a PLC, because the PLC is by its topology BELOW the computer. And you download something from the internet, because the internet is OVER the computer in its topology. Thats nothing chinese, because also Siemens call it in this way at their TIA Portal. Also on Rockwell PLC and so on. Summerized: The BMS is below the computer, so thats why they call it download.
This whole firmware update process is very user-unfriendly and will only be done by nerds or installers (who never actually do this). This kind of equipment should support fully automated update without any cable shenanigans. 🤷♀️
I'm sorry, but expecting you to upload firmware via 9600 baud in 2024 is stupid, if you want to stick to serial then at least support 115kbps, but you could also put usb, cf, etc. in for firmware updates.
This is the proof of bad idea of communication... No communication is better because there is nothing to disconnect... Information about your system is enough to know what is the voltage of your battery, and what power you are getting in and out... This means, all this work here is useless... I don't have any of this issue... So it is not worthy... Good for the seplos, but is not necessary...
Yes, I get your point, but from a certain system size on, you want comms between battery and the inverter from a pure safety perspective. I drove my battery shelf without comms for ~2years and never had any issues. Until I connected the BMS and could actually see the data. One battery turned off frequently because of an over temperature problem in summer time and I didn't even noticed that. It turned off the battery, cooled down and turned it back on. I didn't know about it as everything just 'worked'. But that's very bad system design and can be quite dangerous.
but you forgot a major point: they were the first selling these inverter bms which let us build diy lfp batteries to integrate them seemingly into growatt or sma or other manufacturers. and seplos was the first selling cases with bms as diy kits for lfp cells. If you do not need those other do and JK had back then messed up a lot with their can bus bms cause I had purchased that when they had released it but that was a huge mess cause it could not do can as they had announced it. You had to order that with the right presetting from the factory and you could not change that afterwards on your own.
Andy I do notice the K is up and it’s moving up. Thumbs up 👍 83.6 K now 😊
Yes, I can't keep up any more. Thanks for all your support!
This is for your outstanding support and informative content. Thank you Andy. #Seplos V3.0
Thanks a lot for your support!
I have two of the seplos bms v3.0 with the active balancer setup, the v0.7 tracks soc really well now compared to v0.6, it now tracks in line with my lynx shunt, there is still an issue with the reset as you mentioned, this is more to do with the current resolution at the top end. The active balance communication is only a turn on the balancer , it is not communicating or allowing configuration of the active balancer, you either need to put it into standby for 10 hours with the button or the BMS will trigger the dry contact on over voltage alarm, it then needs the preset values to be met to start balancing which is 50ms differential down to 30ms differential then your on the BMS passive balancer. I have bought some neey to try instead.
Thanks for sharing. I have the total opposite experience with SOC being accurate. I will show this in the next video. It basically stops counting SOC below 6% and above 98.5% and therefore loses track.
@@OffGridGarageAustralia I unfortunately cant post a picture, I upgraded on the 13th March and it was tracked near enough to be useful in my production environment that I felt comfortable to switch from the Lynx shunt to the Seplos BMS at the Battery monitor it has drifted slightly over time without an 100% reset it is currently 56% seplos vs 58.8% lynx shunt after 20 days of partial cycling but this is for me down to the difference in resolution 0.1 vs 0.8 x 2 Seplos BMS's obviously worse the more you scale out the batteries. I need some of your sunny weather and Amps outside to get some more 100% resets :-) I will email you some of the VRM graphs as they show it nicely. Thanks for the testing as always, I look forward to a good OGG video! Be interesting to see if the Peter Can bus system would help, I suspect as the Peter system will be presented with the wrong SoC data the problem would be the same....
@@richardnorman7132 Thanks, got your email and data... I'll email you some sun☀😊
The Peter board will only relay what data they get from the BMS. So hence it is important for the BMS to calibrate back to 100% when the battery is considered fully charged. At least once in a while.
You probably will notice as well that the drift between shunt and BMS will only increase over time without proper reset. Yes, resolution plays a role here if you have these small loads and contributes to the drift.
Nice update! Thanks. I got seplos v3 bms with 2a active balance. It actual work good some limitations.
-It comes with a dedicated switch to turn it off or on
-it also have a connection to the dry contact of the bms to trigger the balance voltage.
The limitation is that the balance voltage is not good not from 3.45v. The good side is that it has a dedicated switch that you can turn on it off. I only use it to balance pack and it will be off until next event I’ve unbalanced pack. Seplos would need to redesign their active balance
I would like you test the active balance too.
Thank you. I have seen this switch at the bac of their vertical battery and was wondering if this is just a manual overwrite of the automation. Has the Seplos BMS relay contacts? Can't remember, but the Polo batteries don't have them exposed to the outside.
Andy, the SOC calculation was wrong with previous firwmare (but now, you already updated it ^^, it's too late to show the mistake ;) only during discharge. With Cristof48 and myself, we identified the issue, and forced Seplos to update ; now, the SOC calculation is great, but no more feature has been added, you're right.
Thank you. I have the opposite experience and tests done. SOC calculation is worse than ever. It will be in the next video...
Thanks
Thank you very much for your support.
Oh no! It's daylight saving time in Germany now and I have to wait until 9 PM for the latest OGGA show... 😢😅
I need to change the time when I publish the videos!!!!!!!😄
Thank you Andy as always supreme content. ❤
Thank you very much.
Nice to see this. Stuck between a rock and a hard place choosing between seplos 3, and the new jk bms. Upgrading from seplos e10
Why change the BMS? It work perfect at my system and reset everyday to 100% if enough sunshine.
Definitely go with the JK. I cannot recommend the Seplos V2 or V3. The V1 with FW 2.8 was actually the best they had.
@derfreiemensch good question. My main reason is for active balancing, the passive balancing, whilst it works, and technically burns of energy, as I understand. Whilst my cells are grade A, and always within 2mv variance, I still need the faster active balancing when there is a lot of amps being charged.
@@OffGridGarageAustraliathanks for this. I will definitely look at the jk further.
My heart skipped a beat with black heat shrinked cable going to a positive. Glad you checked it before you closed the last breaker 😂
They are all black and have no writing. I ALWAYS check. Imagine, the polarity was wrong😬
@@OffGridGarageAustralia
I’m old, so I need all the clues I can get. I wire by color 🤣
@@SkypowerwithKarl I'll fix this up for you in the next video😂
Hello from California
I’m doing a repurpose of a ford fusion hybrid battery for my solar power bank. Any tips would be great. Love your channel and your knowledge to help others. Cheers my friend
PS I’m 100% off grid living in my RV on a undisclosed location
Hello🙋♂️
What voltage do these batteries have?
Do they have their own BMS?
How do you connect to an inverter/charger?
Hi Andy.
I have the Seplos BMS v3 with its 2A Active Balancer. I ended up by disconnecting the Seplos Active Balancer, replaced by a NEEY 4A unit. Synthesis of the reasons : the balancer cannot be configured, nor monitored.
Details (coming from my own tests & talks with Seplos support guys):
A) The balancer triggers by itself when the cells voltage difference is greater than 50mv and from 3v. That is the way the balancer is "autonomous" and can be used with any BMS => unfotunately those settings are hard coded in the balancer and CANNOT be changed (far too low trigger point for me).
B) the dry contact connectiting with the Seplos BMS brings "some" control through settings 100 & 101, which are cells voltage delta based with stupidly high default settings : triggers when the delta is over 500mV and stops when delta is 300mV) => while this gives a kind of setting to control the active balancer this is far insufficient and does not solve the 3v start point from A).
C) no way to know when and if this active balancer actually works, out of looking at its (blinking) led on the electronic board (or the one on its reset button) => a big lack for those monitoring things a bit/connecting to home assistant or similar.
NEEY 4A does the job perfectly and replaced the Seplos active balancer in my vertical Seplos box (and it fits fine in it :))
As for the SOC from the Seplos BMS, I ended up trying to use it (I totally disklike to overvoltage thing to reach 100% + found it globally inaccurate and not reliable) and bought a Victron Smartshunt to get such information (and in a way I can exactly master what is 100% and what is 0%)
Do you have any trouble connecting to the NEEY over bluetooth while it's in the Seplos box?
@@kchiem No trouble to connect... on a daily basis, the remote monitoring is actually done by an ESP32, which connects to the NEEY using BT and sending data through MQTT/Wifi to Home Assistant. I am getting a really reliable connection.
@@matthieusevestre6401 Is the ESP32 running ESPHome? Can you link to what's needed for the ESP32 to communicate with the NEEY?
Thank you so much for sharing. That is very valuable information. Especially, how the BMS 'controls' the balancer. I was hoping it activates the active balancer when the passive balancer on the BMS comes on, but this does not seem to be the case.
It's a shame that Seplos misses all these opportunities to build good and reliable devices. I really like their BMS but the software is just not really usable. I'm still testing their V3 BMS with my PowerWall 2.0 but found it needs a lot of tweaked parameters to work some kind of...
So, hopefully, I can convince their engineers and R&D team to improve the software. But even little changes take a long time if they even get approved...
@@OffGridGarageAustraliaunfortunately there is no use of the passive balancer settings and both are living their live in parallel, blindly at some point.
Seplos would be able to update the software on the bms to change the way they trigger the active balancer through the dry contact, but this would works only if there is a way to disable the active balancer « self trigger hard coded settings » (otherwise it will continue to activate from 3v), which seems unlikely for the units already produced (unless there is an hidden way to update the active balancer Seplos did not tell me about )
hi, I had the connexion probleme to connect the pc to rs485-1 I had to disconnect the ground in my adapter, but need the ground in RS-485-2 ????
No idea, Seplos didn't mentioned any of that... I just use 4851 and it works...
I think it has something to do with the automatic setting of master and slave addresses.
Seplos 2A Active Balancer. At US$100 it is too expensive. IF it was truly SMART and connected to the BMS in an intelligent way, where the settings could be accessed/changed via BT. Yes, I could see that being useful. Most of the time, the passive balancing of the BMS is OK, and the active balancer is not needed. If you had correctly top balanced a pack when new, there is a good chance you would not need an active balancer very often, so a power switch on the outside of the battery box would be a good idea. Your cheap balancer solution works fine for me on my V2 BMS's.
I think Seplos has such a switch on their vertical box to power on the active balancer (I've seen it in their video). It also turns on automatically, when the delta is over 50mV.
After 1,5 year running the old v2.9, I'm done with seplos. I wanted to upgrtade my 5 packs to the new v3, but there support is so bad, I'll go with the new jk, it can't be more worse.
Yes, the innovation of their BMS is not great. JK is doing so much better.
I have swapped the V2.9 with the JK BMS in one of my batteries already. It's a lot of work because nothing fits and is compatible like in the batteries with Pace BMS.
The v2.8 was actually a lot better than 2.9 and worked surprisingly well. It even resets to 100% all the time reliably.
BTW Andy, I have received the USB to RS485 ordered following your link but I'm afraid I could not connect to my Seplos 200E on port 1 (or2). I was trying to verify that it is the correct one but cannot remember in which video you posted the link.
That is strange as I have tested all my adapters and they all work with all BMS I have.
Hello. I've done the same and the adapter is good and working,but not perfect unfortunately. I've ordered according to Andy's link from his webpage. The windows found the driver without the need of installing drivers, but was unable to connect. I've searched for seplos BMS connection schematics and for usb/rs485 adapter schematics, but nothing helped. Finally I decided to switch data A and data B cables. I made it on wire 1 and 2 (orange/white orange) but it didn't helped me at all. So I try the same on wire 7 and 8 (brown/white brown). So the final solution was to interrupt the wires 1 and 2 and to switch(exchange) wires 7 and 8. I've used some wago clamps just to give it a try and finally let it be like that. Now it works like a charm.
@@peterpanacik2708 I think I was using 7 & 8 in my connection but I'll have to check again and I never used any other of the wires. Did you have to invert 7 & 8? Swapping one for the other?
@@peterpanacik2708 Do you mean swapping 7 for 8? 🤔 I'll check again but I think I was only using wires 7 and 8 but in the raccomanded order.
@@9111logic according to the seplos manual the Seplos V3 uses the RJ45 connector with active pins 1,2,3 and 6,7,8 in mirror configuration. 1, 2, 7,8 are data lines and 3,6 are ground lines I don't know why they use ground wires/lines with rs485 as it is floating communication,but any way.... According to standard data A and data B should be enough.
Anyway. There are two ways to do it.
1.) Either you are going to crimp your own cable, so you need to make cable connection Seplos site pin7-adapter site pin8 (should also work with mirror application Seplos site pin2-adapter site pin1) for dataA and Seplos site pin8-adapter site pin7 (should also work with mirror application Seplos site pin1-adapter site pin2) for dataB. You can use GND connection just to be sure Seplos site pin 6-adapter site pin6(mirror configuration pin3 -pin3)
OR
2.) you can miss the RJ45 connector as I was, or be lazy to crimp,or anything else, so you will use a standard RJ45 patch cable, put away 15cm long piece of upper insulation so you will see twisted wires, cut(interrupt) orange and whiteorange cables, and cut and interconnect brown cable with brownwhite and vice versa.
It's hard to describe. It's a matter of one single drawing. Hope you have understood all the descriptions and it will help you to successfully connect to your BMS ;) .
Hi Andy, the two charging methods used by seplos bms v2 and v3 are working perfectly. Also the reset to 100% works perfectly in both cases. The embedded passive balancing system is great and it's able to balance all cells even after several days away from the full charge. I left several comments aroud 6 months ago on how to make it working in both methods... Peppe from Napoli.
Also my system run perfect and reset to 100% at 55,4V, if you set in DVCC 55,4V the system run a little higher and all resets to 100%
@peppeper9325 Could you let me know where those comments are, just so I can go back and read them? That would be very helpful.
Ah, here is Peppe again. Seplos always works for him apparently, despite me testing the exact opposite. Share your settings, my friend and tell us a bit more about WHAT is actually working... I assume you use OVP to control charging... The balancer is a joke as we have seen multiple times.
I currently have a set of 5 x 100Ah batteries in parallel for EV charging. There are 3 Seplos Polo with bms V3 model V10 and firmware 0.7, one Orient Power with Pace bms, and one Power Quenn with a JK bms (I changed it).
Before the update to 0.7, the SOC calculation was catastrophic, I had a difference of 40% at the end of discharge between Seplos and the other bms. In Charge, the Seplos reached 98.5% very quickly when the others were at around 60%.
Now, with version 0.7 the gap has been reduced, the SOC indication between the JK and the seplos is approximately identical, and the Pace SOC with a difference of around 7%.
At the end of the charge, the Seplos show a cell imbalance of approximately 40 to 50 mv.
Do you know why Seplos quickly abandoned the marketing of Polo-type models? is it because of the pouch cells ?
You're working with Cyrille, right? I think I have seen your video in French when you tested the three Seplos and the SOC was all over the place.
Thanks for sharing these results of the three BMS, very interesting.
I don't know why they discontinued the Polo series. I think it was a good battery design but maybe too expensive to manufacture for them due to the round curves it had. There is a lot of competition out there in this 48V100Ah segment.
I don't think the pouch cells had any issues as they were perfectly compressed in their own little fixture inside the box.
They definitely bailed on the pouch cells. This really confused me when I first started looking at the wall mount battery first called the Polo-L, and then Polo L-208, and now 104-L. Seplos marketing can’t decide what to call it and I was confused because the Polo-L used pouch cells but the Polo 208-L / 104-L uses prismatic cells.
Thanks Andy
No worries
Hello Andy. Thank you for the great video again. If I remember right, you used to have a seplos config printscreen published at your website/my settings. Now mainly JK settings are there. Can you please add config for Seplos V3 you used in this video for example? Maybe printscreen, maybe a direct config file to download ;) thank you. Greetings from Slovakia ;)
Hi Andy, but I also have the problem with the new JK BMS that my battery stays at the requested charging voltage the whole time and doesn't go into float mode. The reason is that with an RCV of 55.2V only 55.11V is reached and the inverter does not increase the voltage any further. This means that the trigger for switching to float mode is not triggered. I think it is due to a calibration problem. I tried setting the 55.11V as 55.2V but the next time I charge the voltage is still below 55.2V. Neither JK nor Goodwe have responded to a request so far. The firmware is the latest x.11. Perhaps you can look into the topic of calibration. Or someone from the community knows the problem and has a solution. Best regards Andeas
Yes, correct. if your inverter does not have a charge voltage offset, it won't work with any BMS. Your inverter measures differently to the BMS. You can only calibrate the BMS as per your inverter to make it work.
Victron has the SVS - Shared Voltage Sense which shares the same voltage across all devices.
Like# 1 - BOOM
We’ve had 53” of snow in the last week!
🥇
Hi Andy ! love your channel ! I’m planning to build my own DIY LFP battery soon … What do you think it’s the best choice ? Jk BMS ? or a Seplos BMS with a separate active balancer ? the best quality/price/ beginner proof choice ?
thanks for your work !
Definitely go with the JK-BMS for your battery.
Strange, whenever I need to disconnect the Seplos Can Comm I go to the MPPT in my Cerbo where it says "Charge controlled by BMS" and press reset to return to MPPT controlled. Sometimes though it resets the Lynx battery status display to 0% and if I then reset to 100% and manually type the correct previous value, the system does not come to a halt. If, on the contrary, I wait too long, then Lynx thinks the battery is dead and shuts down the inverters and puts the MPPTs in float.
Yeah, the MPPTs have this option but not the Multiplus. And even with the 4 MPPTs, I have to be quick otherwise their comms times out and report a BMS communication lost which ends in a shutdown of the system.
It's not ideal, I wish Victron would have single toggle somewhere to either us MPPT charging or external BMS.
@@OffGridGarageAustralia Let's hope that they introduce a single command for all MPPTs, I have two now so I will have the same problem as soon as I commission the second one.
@@9111logic I have never managed to turn off the External Control in all 4 MPPTs I have, Before one of them throws the error and shuts everything down.
I'm not expecting, Victron will ever introduce such a switch in Venus. Normally, once you got a BMS connect, you stay connected and don't switch back to MPPT Mode. This is more for us 'tinkerer'...
@@OffGridGarageAustralia Unfortunately I had problems keeping the two different batteries running smoothly when the Seplos-based 304 A pack was connected to Venus via Can bus. Odipie technicians cannot help with the rs485 nor the Can of the smaller 100A so I am currently running them controlled by the MPPT until I can build the second 304 A unit. This way they tag along nicely.
Oh si la mayoría de baterias en paralelo tienen un límite de corriente de carga algunos en 10amp otros en 15 ,otros en 20amp por qué???
Andy this 30min timer only works With a higher voltage. Try 56.8V Pack overvoltage protection and also let all settings as there is pre Set from the factory. Cell ov warn 3.5V cell ovp at 3.65V.
For me this works every Day. I tried first with the 3.45V but this Has Not worked for me.
That would be even worse if it works only with higher voltages. This software is a nightmare...
@@OffGridGarageAustralia just for you to test i dont know the exact 100soc parameters.
@@betterlifeacademy1744 I think, we have tested all that already back when we had a comprehensive look at the Seplos V3 BMS. Links are in the video description.
@@betterlifeacademy1744 Ah, OK, I think I have tested this already with all versions of their BMS and also higher voltages.
Andy I'm running 2 x Seplos3 v0.6 BMS's without active balancers, each controlling 16 x 280Ah cells and I dont have the 99.9% issue you're having, my batteries charge to 100% perfectly every time. I'm also running Victron with a Cerbo GX but Im 3 phase and have feed-in turned on for exporting, everything is working as it should. Let me know if you want to compare settings.
I assume you charge until you reach the Cell overvoltage protection. The BMS will always reset to 100% then.
After you have completed setting up and you have done the work. Do you start doing a maintenance check every day, week, month, or just set back for an alarm ‼️? You did say a couple of days. But you do have new equipment that will keep you busy. But you’re primarily system we see very little work done on them.
I check them on an hourly base, haha. Seriously, I'm going to build a better test setup soon where we can test all kind of batteries and also inverters.
Yes, there is still heaps of equipment waiting and so many videos to come...
@@OffGridGarageAustralia Thumbs up 👍 for your work and dedication.
Hello Andy, can you tell me if you are going to test the seplos bms v3 + active balancer (2A) from seplos? Greetings from Poland :)
Heya, nice test so it seems that the new firmware doesn't work better as the older version's that's to bad would be nice if you would see some progress.
I'm working with them, but progress is very slow.,
so at this point with multpiplus 2 and seplos v3 bms is it better to just use no coms and let victron control things?
I wouldn't disconnect the comms, but the displayed SOC is still off quite a bit in the BMS and unreliable.
At the moment, there is no working solution to get the BMS reset to 100% when fully charged without hitting the overvoltage protection. This is a bad design and less than ideal. I'm working with Seplos on this but I can't see any progress or even a fix...
But if coms kept then surly voltage will remain (as you said @34 mins ) unnecessarily high voltage all day. Can you keep coms but just use the batteryshunt for SOC? I have victron MP2 15kva on the way to replace growatts and have 4 x 14.3kw V3 seplos mason kits. would really like to know best way to set these up with Victron @@OffGridGarageAustralia
@@giollaliddy5817 Yes, that is probably the best way to run the system: set the BMS as the controlling BMS and ignore their SOC calculation. Leave the smart shunt as the battery monitor for your whole system.
so whats the best. JK bms at this moment ... ?? tnx
My experiance is that the alarm*16 for 30min is still not working. I would really like this feature as it makes it posible to balance the pack a little.
The V0.7 have improved the SOC measureing. On V0.6 the SOC could just suddenly drop from 40 to 0 when it realize that the voltage is too low.
I have also played with the active balancer. Im not impressed. Its relay based, so you can hear the "clicking". The remote "dry contact" from bms did not turn on.
I could only turn it on manually by pressing a switch. Maybe its better with the v0.7 firmware.
Compaired with Neey, its a dinosaour balancer with all the relays 🤣.
Thanks so much for sharing. I have not read any positive comment about this balancer so far. I know the technical details and how and when it activates, but yeah definitely a 🦖
Hi Andy, please can you do a video about SOC displays, I have 2 jk 200amp BMS working on 304an EVE batteries. The soc goes up and down with no real relationship to the actual soc. One set is powering a gwiz electric car and the other is running the house. It will often say to low or to high, resetting the BMS battery ah figure will bring it back to what is closer to the actual Soc. I want a display i can rely on.😮 Ideas please, the best Soc display 👍 Thanks Ellis
I have two JK BMS running for a very long time and they both show the SOC correctly. Sure, they need calibrating from time to time, but once set, it does it all automatically. What do you mean by 'the soc goes up and down'. Got an example?
Thanks for the reply, so for example today the soc said 89%, resetting the ah it now says 73%. An even better example is it showed a similar voltage but only 3%😂
I will add some screenshots 👍
Andy, does the 100% soc need to be hit to record a cycle or does the bms add the totals up to make a full cycle? Like a discharge limit of 40% and a charge limit of 80%?
The BMS counts Ah in and out and uses that to calculate the cycles. The 100% is really just a display. You won't believe how many emails I'm getting from people asking why their battery never charges to 100%😊
@@OffGridGarageAustralia That makes sense Andy thanks.
Part 2 can't come quick enough for me, as usual I am in the 💩with my system, I have "Another Brick on the Wall" and I might be needing a bms upgrade asap.
My new SOFAR HYD inverter won't work with my old version jk or user defined settings(lead acid). I get a constant BatOVP ID070 fault. Any SOC and any setting 😭😭😭
Thanks for the info Andy.
Shine on
Cheers
Gaz 🏴
You've got a lot of trouble with your system. Have you made this drawing with all your connections so you can systematically find the issue? Get a big piece of paper and go...
@@OffGridGarageAustralia I did do that but this is a different inverter mate. We got a refund on the naughty LUX POWER it was definitely faulty.
This SOFAR SOLAR HYD inverter registers the ct clamp, load, pv and battery voltage but alarms out with a Batt over voltage protection.
SOFAR Tech support is useless. Turn it off and on again or buy a ready made compatible battery. They clearly have no time for DIY
Even the Lead acid setting with my bench power supply it still alarms out at any voltage or charge setting it alarms out.
Thanks mate after your latest series I have ordered a JK inverter BMS.
If after this it don't work, I quit.
I notice you dont change the dip switches to canbus paralell? Is there a reason for this or did you just not show it?
You don't need to change the switches with the V3 BMS. It sets the addresses automatically.
On my sailboat i need to switch my batteries for 16S 280Ah LiFepo4. But due to room restrictions i need to distribute the cells in 4 packs of 4. What is the best way? For balance cables a take thicker ones and all of the same length. But what about spreading those 4 packs? Just the cheaper bus bars as well as 2x70mm2 cables as short as possible between packs to keep the resistance between any 2 cells similar? Or does it make any difference because current needs to flow across all cells anyway?
Motor consumes 100A max. But can run for an hour or longer (then maybe at 50A)
I wouldn't be too concerned, especially not about the balance cables. Standard size and different lengths should be fine as there is no current going through them.
The interconnections... 70mm is a great option but at 100A you will see a voltage drop and a cell difference because of that. That could be a problem. What BMS do you use?
@@OffGridGarageAustralia for the sailboat i bought the „old“ JK BMS 200A
Download and Upload is defined by its topology.
You DOWNLOAD a programm into a PLC, because the PLC is by its topology BELOW the computer.
And you download something from the internet, because the internet is OVER the computer in its topology.
Thats nothing chinese, because also Siemens call it in this way at their TIA Portal. Also on Rockwell PLC and so on.
Summerized: The BMS is below the computer, so thats why they call it download.
Well... a question of definition.
@@OffGridGarageAustraliaSure, its confusing :)
This whole firmware update process is very user-unfriendly and will only be done by nerds or installers (who never actually do this). This kind of equipment should support fully automated update without any cable shenanigans. 🤷♀️
Yes, I agree...
Have you got new glasses!? 🙂
No, just several😊
I still think Seplos should pay you for all this research.
I'm happy to work WITH them to get some results for all of us. But things are moving very slowly over there...
Never ever turn off BMS-controll again
good like it
👍👍👍
I'm sorry, but expecting you to upload firmware via 9600 baud in 2024 is stupid, if you want to stick to serial then at least support 115kbps, but you could also put usb, cf, etc. in for firmware updates.
That's the software Seplos provides. I don't see a problem here. It only takes a bit longer to flash the fw. But how often do you actually do that...
Sounds like Seplos told everyone who uses their V2 BMS to get lost
V2 is dead, no further development or updates (unless there is a critical flaw).
new firmware, so new process to calibrate the SOC
What is it this time?
@@OffGridGarageAustralia you need to full charge and full discharge to learn the bms the new soc. No ?
@@cristof48 No, I tried this many times and it updates the capacity but not the SOC calculation.
LTO battery 24v / 48v 90ah ?? Really give 20yrs long life ??😢😢
Nobody know, ey?!
😎
Thank you, my friend.
🐸🐸🐸
Andy, definitely order Active balancer from Seplos or any other balancer. I would like to see how to connect active balancer to Seplos BMS V3.0 Thanks
Crappy. Forget it
Yes, read @matthieusevestre6401 comment here. It's not worth investigating or testing, it seems.
Get one and test it 😎
JK just rules. IMO.
Yes, absolutely.
Lithuania,,, 😅boom
This is the proof of bad idea of communication...
No communication is better because there is nothing to disconnect...
Information about your system is enough to know what is the voltage of your battery, and what power you are getting in and out...
This means, all this work here is useless...
I don't have any of this issue...
So it is not worthy...
Good for the seplos, but is not necessary...
Yes, I get your point, but from a certain system size on, you want comms between battery and the inverter from a pure safety perspective.
I drove my battery shelf without comms for ~2years and never had any issues. Until I connected the BMS and could actually see the data. One battery turned off frequently because of an over temperature problem in summer time and I didn't even noticed that. It turned off the battery, cooled down and turned it back on. I didn't know about it as everything just 'worked'. But that's very bad system design and can be quite dangerous.
you lost me today. I line diagram of what was going on would be noice
That's what Seplos does, it loses everyone...
Just testing the new fw which apparently fixes a few things.
What did you expect from a 0.7 version? You are just part of a big public beta test 😂
What a load of b$#@$$s, I'm so glad I don't do seplos
I love all you videos ❤ except seplos
Its dire
but you forgot a major point: they were the first selling these inverter bms which let us build diy lfp batteries to integrate them seemingly into growatt or sma or other manufacturers.
and seplos was the first selling cases with bms as diy kits for lfp cells.
If you do not need those other do and JK had back then messed up a lot with their can bus bms cause I had purchased that when they had released it but that was a huge mess cause it could not do can as they had announced it. You had to order that with the right presetting from the factory and you could not change that afterwards on your own.