March 16, 20242 yr Hello, I have been using a 4,8 kW LiFePO4 battery with my Growatt spf3500es off grid inverter with no problems at all, until today when I disconnected the battery to put it on a new rack. When I reconnected it, also the data cable for the bms, the inverter didn’t accept the Li setting anymore (setting 5 on the inverter), got error code 4 and the inverter shows 0,0% charge, which is not correct as I charged the battery to 90% before, and using the USE2 setting it show 51,2%. The inverter turned itself off. Without this setting, I can’t use the SoC percentage for the inverter to switch back to grid. I usually have it switch back to grid at 25% SoC. I now only can get the battery working by manually setting the charge and float voltages. (USE2 on setting 5). I would love to get the inverter back to working how it was, so any suggestions would be very welcome. Maybe it’s a typical Growatt issue? Or maybe someone could suggest a ‘back to grid’ voltage if I can’t use the 25% setting. I’m quite sure this battery is a 15 cell battery: the working voltage is 42V to 54V, the advised charging voltage is 53,5V to 54V. What voltage would be around a 25% SoC? Thank you in advance for any suggestions. Edited March 16, 20242 yr by Julian K
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.