Henryc

Hi guys, I'm stumped and would appreciate some advice on my solar installation. I have 2x Growatt SPF 5000 ES inverters connected to 2x Averge (Leoch) 100Ah 51.2V Lithium batteries. I also have 20x 415W solar panels connected. Batteries talk to the inverters via BMS (CAN) and the system ran faultlessly for 1 1/2 years. Recently the system started tripping the power. Instead of allowing the system to switch from battery to AC at night, the system would switch off completely. I discovered that the batteries were not discharging at the same rate. The one battery (master) would run down completely to cut-off point and the inverter would switch-off and go into fault mode. I decided to do a manual changeover at night before the batterties are drained until I've resolved the problem. In sunshine the Master battery will resume charging but the slave never charges. I think the system is only running off the Master battery at the moment. The Slave remains at 60% SOC. If I manually switch the system off at night the master battery will charge the slave (equalise) until the point where cut-off is reached on the Master battery. I updated both batteries' firmware and BMS seems to work as the combined battery SOC is displayed on the inverter. Ave of the 2 batteries. Any ideas?