I hope it’s OK to post here, my installer doesn’t give me a very.. Satisfying answer.
Allmost from the start the system doesn’t balance untill 100%. Reason is that always 1 battery (we have 4) stays behind. So, e.g 3 at 99% and one at 93. With as result it will try day after day to balance. So I switch it off.
I asked, please check it out, we have the idea one battery is not OK. I heard now for the 2nd time that the % is only a calculated figure and that the battery is full. I just can’t believe this. Also, I am told not to switch off the balancing, since they are the experts. But when I then say, sure, but why do you tell me to ask questions about Dess nor functioning right here, at the community, instead of solving it for me?
So.. I have the feeling they don’t know how this really works. Or, they do know, but then I wonder why I would let it balance they after day.
If the batteries are all reaching the same voltage it is not always the same as them reaching the same State of charge.
How is the bank wired? and which battery in the stack is doing it? If it is in a stack and it is one of the middle ones then it is a simple case of ohms law and the more ideal solutions (which is more expensive for owners) is individual connection of all batteries to a buss bar with same length cable from each battery.
For sure, measure the voltage of each battery at 99 or 100%.. if all 4 have the same voltage, soc for each battery is the same. Read-out accuracy of voltage meter should be 0.01Volts, like 55.25 Volts, if one is 53.55 Volts, charge just this battery to 55.25 volts
I had similar behaviour, where one of 10 packs where reaching the 100% limit, but in average they had 99%. No reset to 100% happened. Resolution provided by support was to downgrade the BMS firmware. It’s a Pace BMS in all packs.
Having a new system with 3 MP2 6k5, 4 Pytes v5a batteries I also had to manually intervene in balancing them.
I connected each battery separately once and disconnected them when they reached a specific charging level in V (battery #4 was the one that was „off" by a few percent).
After each of them was done, i connected them again (only the CAN cable, they’re connected to a Lynx separately each) the system then was able to get to 100%.
Not sure if this is a good way to do it (someone will probably berate me shortly if not ), but it worked for me.
To add: they probably would’ve reached equilibrium by themselves eventually, but presumably this was the quicker way.
), but it worked for me.
