why i call Li fussy
Hi all, This doesn't cover all the concerns for me, but it does show at least some of them: https://youtu.be/_PgthByAYz4
Forum Discussion
BFL13 wrote:
No info to compare different heating methods and "size" of heaters, but one of the low temp LFPs that uses the charger to heat it up first before charging starts has this info :
"Because it takes time to heat the cells, the charging process in below freezing temperatures will take a little longer. For example, with the low-temperature RELiON RB100-LT 100Ah battery, it takes about an hour to warm from -20°C to +5°C before charging begins. Over a smaller temperature range, heating to a safe charging temperature happens proportionately faster."
https://relionbattery.com/blog/lithium-battery-cold-weather
That seems consistent with relion using a 100W heater for their battery. Based on the assumptions above 125W will get you ~30C temperature rise, 100W should get you about 25C temperature rise.
It also demonstrates the point that heating the batteries is fast - an hour is reasonable, or maybe 2 hours if you have a less wattage available.
