How to wire seplos V3 BMS and active balancer
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- เผยแพร่เมื่อ 26 มิ.ย. 2024
- A full walk through of how to properly wire the Seplos V3 BMS and Active Balancer. Inspired by the torture of incomplete assembly videos with terrible music.
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By far the best video on how to put the Seplos V3 together. All the other videos, including Seplos themselves, rush over the most complex bit, which is the wiring! And the documentation is shambolic when it comes to working out what goes where. I just put mine together in around 3 hours, and would have been 3 days if it wasn't for your video! Huge thanks and I really hope that Seplos link to this in their videos.
I'm happy the video helped you out Jonny. I noticed the same lack of simple assembly instructions, so I put these videos together for people like you and me, who just want to know where to connect this and that and get it working. Seplos thanked me in one of my other videos and suggested and implied an interest in me showcasing their products. I have some interesting ideas for them and would love to build more of their products and showcase them, but they haven't followed up since. I enjoy building and sharing stuff that cuts the learning curve for others. I hope my other videos are just as helpful to you. Well done on completing the build!
You are the best of all seplos videos at least for beginners like me,thank you so much, save me a lot of headache and frustration.
That was my intention. Happy to help buddy!
Hi Gary
I m assembly same battery as you, they give me 2 sets of active balance cable, all mark as B 😢 and in 1 set they have B0 black. I don't have any clue where it go !
One more question, most of wire go to positive stud of battery cell?
Hi. The trick with the balance cables is to look at the length. One set is longer than the other and the longer set of course will go to the set of cells furthest from the connections, which is the "B" set of cells, which are 9-16.
Each wire has a label which also tells you where they need to go. All wires on the balance cable go to the positive terminals with the exception of the 2 extra wires which go to negative 1 and negative 9. So, yes, most wires connect to the positive terminals. The temperature sensors connect to the negative terminals, as does the Active Balancer negative power wire.
Good Luck with the build
I got 2 times b9-b16 ;) haha and now I am waiting the seller ship me correct one
so it seems to be common that they are not taking care to send correct ones with the box
hello Gary! nice and good video .. do you have a video with the setting on the BMS studio?
I have yet to make that video. Unfortunately my PC died on me recently and I lost some data.
You may need to use an altered RJ45 utilising pin 1,2 and 5. See my responses to @banhvo4958 for more info. Using any old lan cable could cause damage to the BMS.
The settings you will want to change are:
Settings - Baud rate 19200 and access COM 5
Parameter settings:
Line 89 and 90 (capacity) 305Ah
Line 102 (Voltage) I set to 56V, as the standard 57.6 was too high for my liking.
I think that is all I changed. If you see Ah setting at 290Ah, change those to 305Ah if your capacity is 305Ah.
You will need to replicate some of these setting on your inverter if the batteries and inverter are to work in harmony. See my inverter settings video for help on this.
@GaryMeatsFood I have make a new cable with pin 1,2 and 5 and now I can connect to the bms ... but now when I set AoBo protocol on invertor there is an Alarm as batname fail. If i set on user define is no alarm
@@VladBYT If AoBo gives alarm, or battery fail warning, then user define is OK to use. You will need to change some settings on the inverter, especially the floating voltage and equalisation voltage. I set mine to 57V and 56.7V respectively.
@@VladBYT Also the reason why you have battery fail alarm is most likely because the battery protocol setting on the BMS has not been set. I believe it needs to be plyontech in the software if you are to use AoBo on the inverter. However, user define is perfectly fine.
Active Balancer signal from BMS happens when "Cell Diff" Alert is triggered. So, modify settings at BMS Studio so cell diff trigger is the same than Active Balancer setting for start balancing. According to Active Balance documentation is 40mV but by default is set much higher. Don't know why Seplos did it.
I believe cell drift is set to 50mV and should bring cells to within 3mV after active balancing. It’s good habit to hit the balance button on a monthly basis when the battery is topped up.
@@GaryMeatsLife30mV only. From this point is passive balancer task, unfortunately.
Hi from Australia, I have same inverter, using jk inverter BMS, I have a problem with state of charge, after few months of charging discharging cycles, SOC drifts, JK BMS shows 100% after each charge cycle but voltage is lowered in each cycle (in realty it is 70 to 80%). After 7 or 8 cycles, despite showing 100% the battery is 2 or 3 kWh lower in capacity. When 100% SOC, if I change the capacity in BMS settings and change it to the same value, the SOC drops to 60 or 70% and then Solis inverter starts charging for another 2 or 3 kWh. The shift in SOC by Jk BMS is becoming pain, please advise if anyone has any suggestions to fix this issue.
I am by no means an expert, but it sounds like your cells are out of balance. The BMS will show 100% when the first cell reaches 100%. If this cell is out of balance by an average of 10% to the other cells, then the actual state of charge would be around 90%. To the end user, it looks like the capacity is drifting, when in fact the BMS is just protecting the cell which has the highest voltage. If you balance the cells, this should make the lost capacity available to you again....for a while, but it will drift again. You could balance them every 4-6 months, or as often as you like.
A passive balancer won't do a proper job with cells far out of balance. You need an active balancer, or you can do a manual top balance.
Hi Gary
Just finished, turn battery on,amber and green light
on and
----WARN----Y
check it out:
CAPA---WARN.
Please help,what can I fix this. Thank you
This is an easy fix, don't panic. You have a capacity warning because your cell capacity is 305Ah and your settings on the BMS are set to 290Ah. Once you change this in the BMS Studio, the warning will disappear. But I stress, it's not a warning you need to be concerned about.
I haven't made a BMS Studio video yet, but if you need help, let me know. You will need to connect with a special RJ45 and change a couple of settings.
Look at post #2 in this forum below. It was the info that moved me forward. Also check out post #11 for the parameters you should change. Read the whole thread and make sure you select the baud rate of 19200 when making the connection. This rate will also need to be changed on your inverter. If you have a solis inverter, my other video covers that.
diysolarforum.com/threads/seplos-v3-bms-no-port-com-connection.85837/#post-1131983
Thank you
Please give me a link to that special rj45.thanks a lot!
@@banhvo4958 You need a USB to RS485 Converter for Modbus. Here is the one I used www.amazon.co.uk/dp/B078X5H8H7?psc=1&ref=ppx_yo2ov_dt_b_product_details
You can cut one end off any internet (LAN) cable and connect pins 1,2 and 5 to connection B, A and GND in that order. This will let you connect the battery to your computer, selecting PORT 5 and the correct baud rate when making the connection.
What is pin 1 you might ask? Look at the back of the LAN cable (the bit with no tab) and you will see pin 1 is the left wire. Pin 1 is Orange & White. Pin 2 is Orange. Pin 5 is Blue and White.
A successful connection will give you a red power light and a flashing RXD light.
Change Parameter line 89 and 90 to 305Ah.
Change Parameter line 91 to 100Ah.
Change Parameter line 102 to 56V.
These are the main settings I recall changing on mine.
Disclaimer: This is what worked for me. Follow any instructions at your own risk.
Thank you Gary!