More on LFP Charging
Some "sales" statements here, but also some possibly good info of interest. One thing is they found longest life (most cycles) was to charge at 14.4v but at lower amps at 0.3C. Some LFP owners o...
Forum Discussion
“Im not sure I like the way they call charging to 100% overcharging, its not. overcharging is when you exceed the voltage that gives you 100% charge.”
Once the end of charge voltage performs it’s near sudden vertical ramp-up (indicating having achieved max charge holding voltage, but still not yet at 100% SOC), the absorption current then begins over time to taper down until the current eventually cuts out which then indicates cell absorption complete, or 100% SOC - thus, voltage alone just tells part of the story…Higher voltage will help expedite the absorption phase, but if too high can come at the cost of unnecessary cell degradation…3.65v per cell is typically the recommended upper limit, but (if programmable) in my view 3.55’ish is better…Beyond current cutout there’s no need to float a LFP…
As far as 100% SOC goes, the $64k question should be “100% of what??”…An actual load test might reveal more actual amp/hrs that the mfg’s spec, in the case of my drop-ins, 7% more…
3 tons
Once the end of charge voltage performs it’s near sudden vertical ramp-up (indicating having achieved max charge holding voltage, but still not yet at 100% SOC), the absorption current then begins over time to taper down until the current eventually cuts out which then indicates cell absorption complete, or 100% SOC - thus, voltage alone just tells part of the story…Higher voltage will help expedite the absorption phase, but if too high can come at the cost of unnecessary cell degradation…3.65v per cell is typically the recommended upper limit, but (if programmable) in my view 3.55’ish is better…Beyond current cutout there’s no need to float a LFP…
As far as 100% SOC goes, the $64k question should be “100% of what??”…An actual load test might reveal more actual amp/hrs that the mfg’s spec, in the case of my drop-ins, 7% more…
3 tons
