LiFePo voltage sagging
120 AH, , nominal 12.8V. 12.95V unloaded, 12.8 under 4-5 A load. According to discharge curve 12.8 is 30% (they measured at much higher 0.5C rate discharge): Lynac 12.8V 120 AH . Quite a bit of sa...
Forum Discussion
I don't have access to BMS, sealed unit, don't want to open and wouldn't know what to do if I opened 🙂
The battery is mostly for back-up, there is grid power. I'm trying to find a middle ground btw the popular mantra "Don't keep for long in Absorb, don't float, don't keep it 100% all the time" on the one hand, and the need to keep it near-full in case of blackout on the other hand. Blackouts happen a few times a month.
I would like it to stay at 80% and cycle shallow. What I do now is letting it charge on solar + converter, and then shut converter off for the night to reduce floating time.
Ideally, I would like to store it unloaded at 50% charge for a longer life but this is unrealistic and I doubt that my life will be much longer than 4000 battery cycles (6 months a year = 180 cycles a year = 22 years).
