Quote:
Originally Posted by Rucker
Does your owner's manual or vendor website discuss top balancing the battery? It might be an algorithm and you just have to make sure the charge is at a certain point before top balancing kicks in automatically.
I thought it was a very good point Bussbry made that there might be one cell off but let's assume for the moment they are balanced. What is your actual voltage reading? You say they are charged enough but what is the value?
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The batteries are parallel, so if one cell dropped and a BMS opened the other would still be online you would think. He’s reporting that the DC and AC drops so I would *think* it’s more of a current or connection issue than one runaway cell causing both batteries to drop out.
Wellll as I type I guess one cell could drop out and then it would transfer the complete load to the other battery and it may not handle it all on its own and then drop too so this could still make sense.
The diagnostic could be difficult to perform but I think you would have to look for lights on the bms that could lend insight or see if you can get a volt meter on the bms input and watch what happens when they drop and just before. If you see BMS input voltage go up prior to the drop that battery is prolly dropping out first. If it happens at the same time on both batteries the issue probably lies elsewhere. Would be interesting to find out, but who knows if you can access that part of the battery easily.
the sealed cells I would think are fine unless they're old. but see if there is a difference between either of the two main batteries. they should be near exact on voltage under load and charge.
but I am down in Pheonix so not too far. do you know if there is a Voltage difference or high impedance on either cell?
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