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SOLVED? Seems that I got caught by assuming my almost identical voltages meant the same SOC.. I thought they were close enough for the BMS to balance them, apparently not. After top balancing everything again all seems much better. I should probably delete this thread as it doesnt offer...

Hi there. I hope you've got it solved. Out of curiosity have you used a multimeter to confirm the cell voltages against the app data? I am very new to all this. But I'm having the same results (very unbalanced cells shown by the app) however, when checked with a multimeter, all my cells appear...

Sorry to hijack this post. It seemed better than creating a new one with similar issues. I have a 4s3p set up (somewhat irrelevant, but anyway). Cell 1 of pack 1 charges and settles much much faster than the others and triggers a warning in the app, so much so that I can stand there and...

Sorry to jump in. I'm likely going to need to try this sometime. But when you say 'Red to Black' do you mean positive from power supply to positive cell terminal? To me it didn't read like +/+ , but can't get my head around it the other way. ?

*edit. Looks very possible that for some reason one bms had 1 parameter which was different. The Discharge toggle was option off, Charge was on though, hence why I didn't give it much thought on my charging issue. ---- Thanks for your reply.. i think my problems are just unfolding for me...

Hi folks So ive just wired in my system and connected my mppt dcdc charger. However the only lights i have are for the battery and battery type. I have selected blue for lithium. I have checked the voltage of the solar panel, and that gives me roughly 25v where it is now. I feel this should...

One thing. The studs arent super long. Is quite tight with the busbar, fuse and BMS all on one stud. But does just fit.

Finally finished the build. Now waiting to have a use for it! BMS Bluetooth app is the carplounge BMS monitor. The other I tried didn't allow for parameter settings. https://play.google.com/store/apps/details?id=com.carplounge.bms Purchased 173ah cells. The xiaoxang app says 190ah available...

So far seems ok. This is my first time with these things, so no comparisons unfortunately. I would have like them to have come with absolutely no bulging. But half of them have. However the capacity tests all came back closer to 180ah, and they are rated 173ah. So no complaints. I am waiting...

Oopsie daisy. 0.44v Second capacity test was done during the day when I was working. Came home just over 12 hours later and the capacity tester still draws power even after the 2.6 low voltage disconnect. Bit of a bummer, as I now have inaccurate result and a beaten cell. Was under some...

Beep! Woke up to a finished test. Pulled 183ah 2.6v LVD Would be nice if you could turn off the beeping though haha. 11 more to go ?. Is it ok to leave cells fully depleted for a few days? Or should I hook them back up immediately?

I'm guessing that the tester chooses the voltage based on the input. Which if I'm correct is why it states 2.8v

Top balance done. Charged to 3.64v Now capacity testing starts.. Although the cables are immediately hot and the wall plug is flimsily. I'm a little sceptical if I should carry on. *Maybe I should purchase larger wire and a decent quality plug! But I'm a little to hasty to wait. The capacity...

3.295 start voltage measured with my new clamp meter from Amazon. https://www.amazon.se/dp/B07Z398YWF/ref=cm_sw_r_cp_apa_glt_i_4VHFN5Y8G2Q48Q6KTMPA?_encoding=UTF8&psc=1 Have connected them all in parallel, and charging at 3.6v, started at 7amps. Did a silly thing buy purchasing a charger...

Next steps Top balancing with "Wanptek Adjustable DC power supply 30V 10A LED Digital Lab Bench Power Source" Ali express. SEK 511.75 36%OFF | Wanptek Adjustable DC power supply 30V 10A LED Digital Lab Bench Power Source Stabilized Power Supply Voltage Regulator Switch...

More photos

Cells arrived today. Happy valentine's ? All seem good. Packaging was and sturdy. All 12 cells voltage all come in at 3.295v. The cells all seem to have a slight bulge/expansion in the middle. Temperature is around -5°c outside, so waiting for them to warm up before balancing and testing. Is...

Thank you, very helpful ? appreciate your help/ time

Thank you. I can't find the fuses usually used in a high enough amp rating (300a) available nearby. Would one like in the photo attached be acceptable?

May I ask is it a good idea to use a bussbar to connect a Fuse to the battery main positive? Seems safe and saves wire/lugs and distance between battery and fuse.

From reading the comments, the main consensus seems that the case/box is basically just protection from something creating a short.. If so, could something like this link also be used https://www.amazon.se/dp/B07ZHD5TQ1/ref=cm_sw_r_cp_apa_glt_i_EMJ5ACS212ZZ1XSH13MS?_encoding=UTF8&psc=1 If you...

Balancing and capacity test. So my cells should hopefully arrive February. I'd quite like to be ready for then. Minimising single use items would be great. Questions first: 1) My ideal capacity test idea. I'm going to purchase a victron smart shunt 500a, and JBD smart BMS 200a. So my...

Have been doing my research, and also came to wonder if this smart shunt could do the capacity testing. What I'm understanding from this thread, the shunt on its own even with with the Bluetooth won't record the final data. However.. I have an old smartphone, could I theoretically just download...

@Tlovell Thank you for showing your results, I will read this a couple of times and hopefully recreate your tests. As they seem like solid examples to follow, along with many of Wills YouTube videos. Really appreciate your attention to detail with this post.

Tested and waiting for shipment

Hello. * Not sure if this should be in the newbie corner?! I decided to make the decision to purchase x12 EVE 173ah 3.2v lifePo4 cells, and x3 JBD 200a smart BMS from Daisy at Docan technology (Shenzhen) co., Limited. The reviews were good, and Daisy Efest was very helpful to guide me through...

Going to jump in on your hijack. Has anyone purchased x2 100a BMS instead of 1 200a BMS? I'm interested as to how one wires them, could someone theoretically use x3 weaker BMS instead of one stronger?