LifePo4 Charge Performance
Thinking seriously about replacing our two GC2's with a pair of 100ah LifePo4's. Hearing a lot of chatter about how lithiums accept a charge much quicker than lead cells. Very familiar with how ou...
Forum Discussion
Battle Born says:
"To summarize this, a bulk/absorb setting between 14.2 and 14.6 Volt will work great for LiFePO4! Lower is possible too, down to about 14.0 Volt, with the help of some absorb time....."
That would relate to the other info that to get to high SOC at constant amps, you need more voltage (but there is a voltage limit you can go to), otherwise tapering starts earlier.
So when I was annoying folks comparing charging times and they insist the LFP stays at constant amps, that "depends". It is complicated!
BB says charging at 50 amps with a 100AH LFP, at around 14.6v tapering would start at about 90% SOC. So if your charger loses voltage in the wiring on the way to the battery, tapering would start at a lower SOC.
Anyway this is just to "clarify" the claims of "faster charging" and define that exactly. Same as we did with those claims that you got 5 times faster charging with AGMs.
Meanwhile there can be good reasons to get LFPs besides faster charging if those other reasons apply to your situation. If your main reason is to get faster charging, then do the math to find out how much faster it would be compared with the charging times you get now.
"To summarize this, a bulk/absorb setting between 14.2 and 14.6 Volt will work great for LiFePO4! Lower is possible too, down to about 14.0 Volt, with the help of some absorb time....."
That would relate to the other info that to get to high SOC at constant amps, you need more voltage (but there is a voltage limit you can go to), otherwise tapering starts earlier.
So when I was annoying folks comparing charging times and they insist the LFP stays at constant amps, that "depends". It is complicated!
BB says charging at 50 amps with a 100AH LFP, at around 14.6v tapering would start at about 90% SOC. So if your charger loses voltage in the wiring on the way to the battery, tapering would start at a lower SOC.
Anyway this is just to "clarify" the claims of "faster charging" and define that exactly. Same as we did with those claims that you got 5 times faster charging with AGMs.
Meanwhile there can be good reasons to get LFPs besides faster charging if those other reasons apply to your situation. If your main reason is to get faster charging, then do the math to find out how much faster it would be compared with the charging times you get now.
