Peter
New Member
Thanks Peter. Now my brain hurts.
Sorry...
It has taken me a while to wrap my head around the functions of a typical BMS, that was the readers digest version.
At first blush I do think you have a BMS issue, there are acceptable 16 cell (48 volt) BMS's available at reasonable cost. Ball park is around $40 each, these would be from a chinese suplier who has given fantastic support over the last 6 months or so. You might be lucky and the balance connector is the same as your current BMS. Otherwise you would need to solder in a new set of balance wires, which you can get from the same guy.
An alternative is an excellent USA designed kit that is about $90 each. But that one is a kit of parts and PCB that you need to solder up. You would then also need a replacement balance wires connector.
Check the voltages, check the BMS's for obvious blown up bits, check the voltage of each parallel cell group, check charger output voltage. We can come up with a plan of attack from there.
Please don't loose sight of the sense of humour, as long as the actual cells themselves are ok, we will be able to resurect your batteries and you will learn a lot in the process