mndare
Solar Enthusiast
- Joined
- Jan 3, 2020
- Messages
- 199
I've seen some LiFePo4 datasheets that define these:
Fully charged: charge with 0.3C - 0.5C, up to 3.65 V, and cutoff when the current drops below 0.05 C (i.e. 14 Amps for 280 Ah).
Some manufacturers specified [3.6 Volts and cutoff at 0.02 C] instead of [3.65 Volts and cutoff at 0.05C].
Fully discharged: discharge with 0.3C - 0.5C, cutoff when the voltage reaches 2.5 Volts.
Based on these definitions, charging to 3.65V and 0 amps is a bit overcharging. Probably not harmful if it does not happen very often and the cell does not stay in this condition for very long, but it might also explain why the cell returned 294 Ah.
My boat cells have a suggested cutoff of 3.65 V but a true cutoff of 3.85 for their brand. I have cells with a 2.8 cutoff also not 2.5. You cannot make such generalizations. You must look at the specific data sheet for the cells in question. Most cells are over 100% for first several cycles (ask Will), so sorry that is not abnormal. Please stop splitting hairs people. I am off this thread. Done, gave the info, happy with the 8 cells I have and the 4 more I am ordering. Good luck with your projects everyone