Daly BMS gone crazy..Update Opinions
I was charging my 120ah lifepo4 battery yesterday and came in for lunch and saw it shut down..I figured it hit the 3.65 volt cell limit and shut down,I went out to check it and saw this on the Blueto...
Forum Discussion
Hi all,
Here is a summary from the article that BFl13 linked to:
"To sum up, for long and happy LFP battery life, in order of importance, you should be mindful of the following:
1. Keep the battery temperature under 45 C (113 f) (under 30C (86 f) if possible) – This is by far the most important!!
2. Keep charge and discharge currents under 0.5C (0.2C preferred)
3. Keep battery temperature above 0 C (32 f) when discharging if possible – This, and everything below, is nowhere near as important as the first two
4. Do not cycle below 10% – 15% SOC unless you really need to
5. Do not float the battery at 100% SOC if possible
6. Do not charge to 100% SOC if you do not need it"
I want to run a large inverter. At 50% of it's capacity, if I follow the guide lines in #2 of 0.5 capacity I would need 4 LiFePo4. If I followed the 0.2 of capacity, then I'd need 9. For SiO2, I'd need 1.
Compare that to SiO2 which can do 2.43 of capacity without damage, and no bms to worry about. SiO2 wins hands down on temperature range too. It wins on price, as well, unless you "roll your own", then LiFePo4 is wonderful.
I'm sure lots of people do run their LiFePo4 at 1 C successfully.
Here is a summary from the article that BFl13 linked to:
"To sum up, for long and happy LFP battery life, in order of importance, you should be mindful of the following:
1. Keep the battery temperature under 45 C (113 f) (under 30C (86 f) if possible) – This is by far the most important!!
2. Keep charge and discharge currents under 0.5C (0.2C preferred)
3. Keep battery temperature above 0 C (32 f) when discharging if possible – This, and everything below, is nowhere near as important as the first two
4. Do not cycle below 10% – 15% SOC unless you really need to
5. Do not float the battery at 100% SOC if possible
6. Do not charge to 100% SOC if you do not need it"
I want to run a large inverter. At 50% of it's capacity, if I follow the guide lines in #2 of 0.5 capacity I would need 4 LiFePo4. If I followed the 0.2 of capacity, then I'd need 9. For SiO2, I'd need 1.
Compare that to SiO2 which can do 2.43 of capacity without damage, and no bms to worry about. SiO2 wins hands down on temperature range too. It wins on price, as well, unless you "roll your own", then LiFePo4 is wonderful.
I'm sure lots of people do run their LiFePo4 at 1 C successfully.
