I have an offgrid system, running for 1 year, made of a 8kWh BYD LVS battery, a MPPT RS450-100, and a Multiplus II 5000 VA.
Everyday, after the battery reaches 100%, I observe a strange increase of the max cell voltage, during hours :
Is it normal ? Does anyone have an idea of what happens ? The BMS should be balancing the cell's voltage instead, no ?
Thank you very much for your help