K8MEJ
Owner, Off-Grid Power Systems
I have two banks of EVE 280Ah in 4S (12v) configuration and each with an OverKill 4S BMS. To start with, I'd like to cycle the system between 20%-80% SOC. On my BMS I have full cell voltage=14.00v, 80%=13.28v, and 20%=12.88v. On my MultiPlus and both MPPT controllers I have absorption voltage=14.00v, float voltage=13.40v, repeated absorption time=1Hr, repeated absorption interval=7days, and absorption time=2Hr.
Charger Questions:
BMV-712 questions:
Thank you in advance for any suggestions. Configuring the BMS, chargers, and BMV for consistency is still not fully clear to me.
Charger Questions:
- Should I change absorption voltage to 13.28v instead of 14.00v? or a different value?
- Should I change float voltage to something below 13.28v?
BMV-712 questions:
- Should Battery Capacity be set to 560Ah or 80% of that?
- Should charged voltage=14.00v or the 80% voltage of 13.28v?
- What would I set tail current to be?
- Given my desire to run the system between 20%-80%, should I set the BMV settings so that the BMV shows 100% capacity when the batteries hit 80% real SOC or should I program the BMV so that it shows 80% SOC when the batteries are really at 80% SOC?
Thank you in advance for any suggestions. Configuring the BMS, chargers, and BMV for consistency is still not fully clear to me.