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,
Don't get me wrong. Li can be made to work well--so long as the RV is occupied.
See my post about how long it would take using a 1.8 amp heater (~23 watts), assuming ZERO losses, to warm up from -30 F.
About 62 hours (back of the envelope calculation) from -30f to -4f.
My calculation was not to get to 24 f--so it becomes insane to attempt to warm them up to where they can be charged using their internal heater.
To get from -4 f to 24 f is going to take another huge bite of energy.
55 wh x 28 = 1540 watt/hours and 66 hours assuming zero heat loss from the case.
If you use a higher wattage heater it shortens the time--but it doesn't change the number of watt hours needed. It is a zero sum game.
It would require a generator to be run--and a battery management system that would run the heater--but not allow charging.
Don't get me wrong. Li can be made to work well--so long as the RV is occupied.
See my post about how long it would take using a 1.8 amp heater (~23 watts), assuming ZERO losses, to warm up from -30 F.
About 62 hours (back of the envelope calculation) from -30f to -4f.
My calculation was not to get to 24 f--so it becomes insane to attempt to warm them up to where they can be charged using their internal heater.
To get from -4 f to 24 f is going to take another huge bite of energy.
55 wh x 28 = 1540 watt/hours and 66 hours assuming zero heat loss from the case.
If you use a higher wattage heater it shortens the time--but it doesn't change the number of watt hours needed. It is a zero sum game.
It would require a generator to be run--and a battery management system that would run the heater--but not allow charging.
