Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
1) This is perfectly Normal & Acceptable for LFP to Settle to "Working Voltage from Full Charge. Charging Above the working range can reduce lifecycles over a shorter time period.I Have 4 Packs of Grade A Cells (Fortress Power eFlex 5.4KW Batteries) and I just ran some test on the most recent one with only 10 cycles on it. It will charge to the factory recommended 55V but will drop down to 53.5V after an hour or so. I did some Log checks on the other three batteries and found the same thing with no measurable degradation as they reached the 340th cycle. They started at 53.5V and are still at 53.5V. This equates to 3.43V per cell at the 100% charge point.
I can force them higher but they will eventually still settle down at 3.43V per cell. I also have one EG4LL which brings the bank size up to 27KWh.
2) If settling at 3.43, that IS the top of the Working Range (3.000-3.400) shows A) High-Quality Cells B) Well operating BMS You are getting 100% Working Range.
3) At 55.0V Charge you are at the "edge" of the effective charge range. Generally 3.425 / 55.8 is the Peak Target point. so you are peachy.
Steve