Battery SOC up and down
I have been trying to discover the correct settings for my inverter in relation to communication with BMS.
Why I think settings are incorrect...
The reported input and output of my 20kWh batteries totals only around 14kWh.
I have had the BMS connected with RS485 and they behave smoothly and predictably, but only storing and delivering 12kWh (between SOC 100% to 15%)
Trying BMS connected via CAN looks hopeful when first connecting, as reported SOC immediately drops to a value which would leave space to store the full 20kWh, like from 77% to 55%. However it then goes haywire with SOC jumping up and down and switching charging on and off, so e.g.
reports SOC 14% starts charging,
a few seconds later SOC 37% stops charging
repeat until I worry that I will damage something and switch system off.
My installer declared bankruptcy a couple of months after the installation, so no joy there, but I think they were out of their depth anyway.
Any guidance would be very gratefully received.
My system, Sunsynk 5.5 inverter, Batteries Delong LFP 51200 - 10 x2
I didn't get anything. Did you add a ".uk" to the end of my email address? Many do but it's just ".co"