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
Steve,
I find some of your statements misleading.
1. not all li can discharge at high rates. When they are BARE without bms it is true--but at least some BMS designs limit discharge rates to 1C
2. SiO2 can be taken to 0 volts--so the capacity is 1C, but you do loose cycles.
3. SiO2 can be charged at 27 amps. There is no bms to protect the battery--that is on the shoulders of the owner.
4. LiFePo4 can only be taken to 20% state of charge. The makers get around that by building a 120 amp-hour battery and using the BMS to limit it to 100 amp-hours. As with most batteries going deeper costs cycle life.
I think pouch cells are a bit riskier than the approach that Tesla and other makers are using. One poor pouch may dramatically reduce the entire capacity.
I believe LiFePo4 are GREAT, but only if there is zero cold weather use. If there is--then the MUCH more expensive lithium titinate chemistry needs to be used.
It is at this moment -22 F where I am located. Last night was -35 f.
I find some of your statements misleading.
1. not all li can discharge at high rates. When they are BARE without bms it is true--but at least some BMS designs limit discharge rates to 1C
2. SiO2 can be taken to 0 volts--so the capacity is 1C, but you do loose cycles.
3. SiO2 can be charged at 27 amps. There is no bms to protect the battery--that is on the shoulders of the owner.
4. LiFePo4 can only be taken to 20% state of charge. The makers get around that by building a 120 amp-hour battery and using the BMS to limit it to 100 amp-hours. As with most batteries going deeper costs cycle life.
I think pouch cells are a bit riskier than the approach that Tesla and other makers are using. One poor pouch may dramatically reduce the entire capacity.
I believe LiFePo4 are GREAT, but only if there is zero cold weather use. If there is--then the MUCH more expensive lithium titinate chemistry needs to be used.
It is at this moment -22 F where I am located. Last night was -35 f.
