FlyDoc

Thank you to everyone for their replies. @Steve87Your suggestion of the equal cable lengths seems to have done the trick. We adjusted the cable lengths so that they were equal coming from the batteries to the busbar. Within the busbar box, we also made sure the connections were equal-spaced. Thank you!

Hello, I would appreciate some guidance. Existing System - 8kW Deye inverter and one Freedom Won 10/8 installed six months ago. Works well. New system - Added a second Freedom Won 10/8 battery. The existing battery is the master. The new battery is the slave. Installer added the second battery. Powered on BMS of master first. Then powered BMS of second/slave battery. Both are connected via an ethernet cable. Battery info in Deye manually updated from 200Ah to 400Ah battery capacity. Problem. Both batteries are charging and discharging at different rates. SOC seems to be picked up from the master battery by the inverter. The master battery discharges more quickly (green indicator turns blue as battery hits 89% - on slave, this happens about 17 mins later under constant discharge load). Any guidance on balancing both batteries so they charge and discharge at roughly the same rate? Are there any settings in the Deye that need to be changed? Thank you!