The Yixiang DIY Box with EVE LF280K cells TESTED! 'Strange' voltage and capacity check!
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- เผยแพร่เมื่อ 8 ก.พ. 2025
- After a few days, I finally managed to fully charge and top balance the Yixiang DIY box loaded with EVE LF280K cells (also delivered by Yixiang). These were the 'special' cells we have tested before which showed some premature voltage increase while charging. Can we see something similar while top balancing the pack and also during discharging for the capacity test?
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Thanks!
Thanks, Joe!
Mike from Canada. Thanks for all the great information.
Always a pleasure to watch! Thank you Andy!
Nice video! It shows nicely, how you have to lower the charge current (dependant of the balance capability) if you really want to top balance a battery pack. Nice graphs!
Yes, the 2A balancer is great but also has its limitations. Especially if several cells are close to 3.65V, it has almost no chance unless the charge current is very small.
The 'normal' capacitive balancers do a better job here as they work on all cells simultaneously.
Superb episode Andy. Brilliant analysis and explanation. regards from Holy Island Max++
Hi Andy, that all turned out very good. Thanks to you I have started using Home Assistant and Batmon. Not very good at it yet but did have some help to set up and it is reporting fine. I love those graphs that you have produced you can see exactly what's going on with each cell. Thanks alot!!!!
Man, love it. You help me run my own system here in Italy.
Great! We can all learn from these experiments.
I'm excited to see what happens. It took me a few cycles, but since then everything's been running perfect =)
Bin gespannt wie ein Regenschirm ^^
Wow, thanks for showing the numbers as you top balanced that pack with an active balancer. Everyone needs a Batmon/HA setup. What you have shown, is that you have so much more precision in terms of diagnosing battery/pack issues when you can collate all those cell values. Another interesting parameter would be to measure and collate the current thru the balance wires for each cell. Maybe one day. Any system without an active balancer should be regarded as half baked, especialy if you use all the battery capacity. I have an offgrid 15kWh pack that had a passive balancer that couldnt keep up and eventually had a 200mV deltaV at 56V. Slapped on a 2A JK standalone active balancer and set balancer to come on when delta V > 20mV ( no ability to set 3.4V) then > 10mV and let it run whilst living off grid using about 4kWhr overnight. Took 3 months for deltaV to get < 10mV at 56V. No run away cells or BMS tripping. So top active balancing can be done while you begin to use your pack but it may take a long time.
Very interesting video ! As usual !
Thank you very much!
Hallo Andy,
your battery was now top balanced once. The interesting part would be how the cells behave at the next few cycles.
I would suggest to charge the battery for the tests with constant current instead with the fence solar system. It would be hard to detect abnormal curves with an inconsistent current.
Beautiful explanation and illustration of balancing in HA.
Waiting some MB31 in Portugal!
You are helping me a lot!
It’s been a real interesting test! I’ve not seen many TH-camrs making so beautiful tests like you.
You got us hooked to the screen man! 😊
Thanks a lot. That's how the channel started 3 years ago. I was curious about all these experiments myself. I'm very happy to share all the data here on the channel.
@OffGridGarageAustralia and we appreciate you inviting us to join your solar ride. Thanx Andy. You are highly appreciated
It'll be interesting to see the curves after 10 or so charge/discharge cycles and see if they all start evening out. As always ... awesome job Andy👍
Whoop whoop!!! Well done and so well deserved!!!
Thank you Andy for this video. This is a very timely one for me because my LFP battery, after 6 months in operation is starting to get a deviation of 250+ mV near the top of the charge. Unfortunately by BMS is passive balance but have been wondering if its a bad cell or if the pack just needs to be properly balanced. After some great suggestions from forum members on another website, and now after seeing this video, i'm thinking there is nothing wrong with my pack, just that it needs proper balancing which is a skill thats still fairly new to me but has become a lot less confusing thanks to all your great videos and help from some others. Looking to get a plug in active balancer soon to help out.
Thanks Andy, as always! 👍👍
Wow amazing results 👏
Thank you! 😊
Great video Andy !
let it few more cycles to see what happens, winter is over for you, more energy is available now
maybe you can try esphome-jk-bms instead of having to put up with that awful beeping (you will then not loose any data on HA when using the JK app in the same time !).
just 10 or 20 esp8266/esp32 to prepare (and as many small 3d printed boxes) for your "few" BMSes 🤣
Or ask JK to replace that beep with a frog sound🐸
Thanks Andy
Thank you, Wayne! Have a great weekend, my friend!
94100 subs. You rock Andy. We would hit 250k by xmas
Thanks Andy☺
Thanks for your interesting video's and your patience and persitence in dealing with JK.
Good experiment Andy! 👌
Thank you! Cheers!
Dear Andy, Thank you for all the videos your making and the joy you bring with it.
Q: what is the adjustable power supply you are using in this video to charge the battery? Thanks a lot!
Hallo Andy,
one thought about the balancer:
It is not really putting 2A from the highest to the lowest cell.
It ist putting 2A into a capacitor and afterwards putting 2A from the capacitor into the lowest cell.
In total average there are only around 1A transfered from one cell to another !
And now with 16 MB31 cells :D :D Haha that would be cool test and comparison
2:30 - I have a similiar experience with an EVE grade A cell pack. Yes grade A, the qr codes are from 1 day and 1 plant and 1 assembly line but even there there is a weakes cell and another 2nd weakest cell which kick in during discharge or rather start decreasing earlier than the others.
If i discharge with 20 A which is about 1000 W then I can note the time the cell passes a certain mark like 3.1 Volt and how long it takes till i kicks the undervoltage proctection of 2,5 V
In that case I have a figure how many minutes this fast cell is ahead of the others. If I assume the other 15 would discharge the same way on the last mile from 3.1 V then we are talking about 30 minutes or 1/2 hour.
This cell than would cost me 1/2 hour x 1000 W or 0,5 kWh capacity of the whole battery. Regardless how good all others could be the weakest determines and kills the capacity.
It took quite a while to get the setup properly and discharge at a constant rate to get comparable results. At the end I charge fully over 3 days and then started a discharge party at 1500 W which meant to get through the party in that night in 8 hours before dawn. And then I added those cells from the bat mon integration into a home assistant report and the issues became visible. 1 fast discharger or runaway and another one following a bit behind, while 10 others are very simiiar, 4 are a tiny bit off and those to runaway cells.
at the end I wanna enjoy the 13,5 kWh I have instead of complaining about 0,8 kWh missing. I had fun to build the EEL V4 DIY and it worked out so far - let us wait and see how the battery will perform over next 8000 charges and discharges.
And one fine day we will find a nice reliable dealer selling cells that are really grade A and perform together as if they were twins.
Good video 😊
Thank you.
Also at my place, Batmon often dont read the data. But only with the new JK BMS never has problems with the 2 year old version
Heya, oke that 1st test looks very good. so it must be good cell's
Hi Andy. Thank you for this research. I find the home assist very interesting. I still have to go into the basement to view the BMS over the phone. I don't know if you've made a video of that yet. or maybe I missed that one. Which home assistant do you use for this? Im also using the lf280k. But now only charging to 55,2V. first time i went to 57,6. The balancing took 2 days here with a victron mp2 3000. Yes we had bad weather. The system is running great now. And we switched to a victron mp2 5000 for faster charging in a shorter period. Prost. and enjoy your jagermeister ;). Thank you for all your clear help and explanation
I use the Batmon integration for HA. It is not 100% reliable but works well enough for my experiments.
th-cam.com/video/Iq0vvR-mQUs/w-d-xo.html
Like# 813 - Don't judge me - 🤯🤯🤯 wow, just wow on the top balancing
get that Tesla Wall Charger installed!!!
👍👍👍 Thank you !
I'm watching ALL of your videos this week! I have a question though: at the end of the day what is the difference between these diy 15kwh batteries you are building and the big name brand ones e.g. Powerwall, Franklin, Sunpower, etc.
Why are those $10,000 and the diy's $2000?
Hi Andy their is a better battery monitoring software for home assistant. It monitors your battery every 5 seconds without switching the blue tooth on and off. it keeps your bms locks to home assistant and you do not have the bms falling in and out
Oké, and can you tell us what software that is?
Please what software is that?
Sounds interesting. Let us know what it is...
Would be even better if it is wired instead of using Bluetooth.
@@gewoonandre My Latest boards support wired connection to the new JK-BMS inverter type, using the RS485-1 Port. Check Andy's under BMS Communication for my info. You would just need the more cost effective standalone board.
I’m also interested to the HA’s software! Thanks
Hello Andy, thanks for te great vid! I have the same problems with Batmon, the data streams stops a lot of time, I was also reading the RS485 data from the JK Bms to the Cerbo, it seems that they can not work togetheher? I have removed the Batmon and now the RS485 works great on the Verbo.
When your BMS reaches above a certain amount of cycled capacity BATmon wont give proper data anymore unless you reset the bms stats. SOC, Power, temp, voltage and charge will be misreported/missing. individual cell voltages will still be available but that will be the only usable data.
Hi Andy, how did you construct the Battery Summary card in HA, where you show the voltage, current, SOC, Bal and Delta all on the same row?
🎉🎉🎉
Just wondering what is the heat gain on that coiled extension?
Apparently figures 8 will not result in heat gain.
First comment, so 🥇
There is no heat building up. This has nothing to do with the shape or form and how the cable is coiled up but only about the heat radiation between the cable and the air. The smaller you coil, the more cable you have in the same space and therefore it gets warmer.
What you mean is heat by induction, but we have L and N in one cable so the electrical fields will offset mostly.
Another informative show thx. I wanted to know if you have seen the TESUP V7 for home use it's wind gen with interchangeable blades for dif wind conditions, I like everything about it.
I think it's made in (U.K.) awsome specs.
No, I haven't seen or heard about it. I just don't have enough wind in my location to really consider it.
@@OffGridGarageAustralia that thing works on less wind than most they have a video on it Y.T. it's very impressive. And thanks (buy a dodge truck) lol.
Do you have a video on how you setup home assistant ? Hardware/software ?
Hi Andy, is it possible to post the YAML for the Batmon/HA integration... Cards used etc.
I am also interested in how he constructed the Battery Summary card in HA...
Hi Andy, wann geht es endlich mit dem Batterie-Raum weiter? Wände aufstellen etc. Das würde mich jetzt mehr interessieren, als das X-te Zellen-Test-Video. LG aus Hessen
I'm not that good with these voltages and staff but i need to buy the full backache from them the battery and the case, do you recommend that fro me
Hi Andy how did you disable the low voltage cut off on the Victron ? These video's are excellent.
I logged into the Phoenix inverter via the Victron Connect app and set the Low Voltage Disconnect to 39V. I usually have it at around 44V, so very low already, but have to go lower for these tests.
how do you connect JK BMS to Home assistant ?
Wow, 15 kWh is a lot. I have expanded my solar with two more panels on the shed. Now close to 7600 Wp in multiple directions.
About 8 months of the year 5 kWh should be quite enough to make it through the night, and in 2 months of winter there is simply not enough left to even top those up.
Would it make any sense for me to get a battery this big? It seems very cheap to build apart from the Victron gear, which I could replace with a hybrid inverter from Growatt that will keep the grid meter at 0 amps as much as possible. I could get a dynamic contract, but then I will need a more expensive system and a huge battery for the sunny hours that the energy price goes negative.
Can I get some help with a simple question; what is the name of the green dry switch connectors? I ordered several of these kits and none came with the four prong plug.
How much can the battery/bms discharge? Can it be more than 2000w continuous? where can i find this information?
It depends on the BMS. This specific one I tested can discharge with 200A at 48V, so 200A x 48V = 9600W. In theory at least.
Hi Andy, greathing from the Netherlands. great video, i just build my first Yixiang 48V DIY Battery Kit with 280Ah EVE cells, I found something strange..... Maybe this is interesting for everyone.!! While installing the battery I noticed something, All batteries were between 0.19mΩ and 0.20mΩ before I placed them in the DIY box and compressed them. But after I placed both PCB boards and before I wanted to connect the measuring wires, I wanted to check the IR again. Very strange, it surprised me a bit. the internal resistance was suddenly 0.30 mΩ on all 16 individual cells. Can you or someone else check that also on your battery? I thought I had placed too much compression on the cells, but that was not the case... as soon as I disassembled the PCB - A and PCB - B, and i measure again, the cells were 0.20mΩ again. Conclusion: probably inductive voltage?? metal over the batteries?
😊😊
🥉
Today’s numbers 93.8k moving up 🆙
Hi Andy, have you ever heard of Envision cells? They are so cheap it's tempting.
Never heard of them...
@@OffGridGarageAustralia That's a surprise you haven't.
On Google search, They supplied Nissan, Now BMW and they are building a giga factory in the north h east of England.
Fogstar UKare s long cells for £54 per cell l, Inc VAT and delivery.
@@OffGridGarageAustralia I am surprised you don't mate.
They seem legit with a Google search.
They make/made EV batteries for Nissan, Merc and BMW and in 2022 they started building a giga factory in the North of England (Sunderland).
£54 Inc VAT and delivery from a UK supplier has me very tempted.
@@OffGridGarageAustralia Have a Google they seem legit.
Garry, I have built two boxes with fogstar envision 305 grade B, just commissioned the system for a friend. They appear rock solid mate, and I have just ordered 32 cells more as they appear stronger than the eve 280 grade A.
Sie haben mal ein Video gemacht wo es um Eel Boxen ging Ich finde das Video nicht mehr . Wie adressiert man mehrere Boxen ?
Yes, I made a lot of videos about EEL DIY boxes. It depends on what BMS these boxes have. There are differences on how the addressing works.
The breaker trips at 275, not double that, i asked
Hello
🥈
Hi Andy in a previous video you talk about a Bluetooth dongle via Ethernet that you have at your page also ,is it possible to make it work with jk bms? inverter and home assistant?
My Latest boards support wired connection to the new JK-BMS inverter type, using the RS485-1 Port. Check Andy's under BMS Communication for my info. You would just need the more cost effective standalone board.
Have a look here and you find the SMLight device which is a Ethernet to Bluetooth bridge. I didn't have any success connecting to HA using batmon integration for HA. All other BT device worked fine but not the the BMS through this integration. Hence I installed the HA server inside the garage and I can now use the built-in BT device in that server to use batmon integration.
off-grid-garage.com/accessories/
More info here: th-cam.com/video/Iq0vvR-mQUs/w-d-xo.html
Danke schön Andy, as always! (Nice kind comment). 😀
@@FutureSystem738 Thanks Dave!
I was gonna buy eve lf90k, do you think they are good or can I get something better in that price range in that size?
I have lf105 in my scooter. One year later and around 10k km the capacity is the same. No degradation so far.
Thanks :)
The famous pool fence is still alive so it must be end of winter down under.
I like the visualisation provided by the bat mon integration in home assistant cause they simply show the real world battery cell performances compared with the china craker ZKE Tech single cell results. They were not really helpfull nor great, I wasted a lot of time for 2 batteries charging these cells and measuring the capacity over and over again.
The only experience I gained from that testing battery (partly I had tested the wweakest cells over 20 times) is that the cell capacity increased by most of the cells and all of the weakest ones.
It made a difference of 1,5 to 2% from first round of testing to 20th round of the same test. Roughly 80% of the cells showed this behaviour and 20% not , the good ones stayed where they had been.
And then I learned about the impact of temperature. Below 15°C you get significant lower results. So I moved to another testing spot where the heating was working and I had 25°C more or less in a 24 to 26°C range. Since then I got perfect matching results based on comparision of cell X during test cycle 12 to 20. Before that the temperature had an impact and results were far lower.
About Wind Turbine do it i Tell you abour that Long Time ago
🐸🐸🐸
Hello Berlin!
Andy, I'm sure you're aware of the DCS battery disaster and all the lawsuits being filed, with YT community rallying support for the Australian YT channel. When are you going to address this?
I think DCS have undoubtedly signed their own death warrant. Who would touch them now?
Do you have a page of your jk bms configuration? it will be my first battery and I have no idea what should be set.
I'm in same situation. Would like to have some support on the subject also...
Yes, of course. All info is on my homepage here:
off-grid-garage.com/my-settings/
😮😮!WARNING!😮😮 The YIXIANG box has 50mm² cable coming from the BMS to the cable connector! It has a 200A BMS. To be able to pull 200A it should AT LEAST have a 70mm² cable (95mm² is adviced for 200A) CHANGE the 50mm² cable!!!😮 - This is a FIRE HAZZARD! -
According to the NEC specification, when you choose aluminum, a wire gauge of 2/0 AWG is best for your 200 amp. However, for copper clads and copper wiring, the electrical installation regulation body recommends you go for 4/0 AWG
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Moin 👍👍👌
Andi, Moin!
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