Why is minimum battery temp charging well below self heating temp activation?
- Thread starter joeright
- Start date
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Andrewr05
[Replicant 42069]
And that's they're using the Ytrium doped cells (or whatever the hell they are 
) in their batteries, then that's probably not true, they may be misquoting or you may have misread and they might be referring to the discharge temperature.
A battery can be used to supply power down to a pretty cold temperature, but to charge it at -4 is pretty crazy.
) in their batteries, then that's probably not true, they may be misquoting or you may have misread and they might be referring to the discharge temperature.A battery can be used to supply power down to a pretty cold temperature, but to charge it at -4 is pretty crazy.
SpongeboB Sinewave
Solar Enthusiast
Maybe -4F is ambient WITH heater on ?
boB
boB
kayakingphotos
New Member
Charging at -4f is either a typo, or a marketing gimmick.... The actual cells need to be above 32f to charge. Defiantly sounds "better" to somebody who doesn't know any better if they say the -4f and then hope that the heating function can get it above freezing.
The manual says the battery management system has a low charge temp protection trigger of at or below 32f..... (page 14/pdf page number 18)
The manual says the battery management system has a low charge temp protection trigger of at or below 32f..... (page 14/pdf page number 18)
Wouldn't these specs seem to infer that the heater kicks in at 32° (ambient) and keeps up all the way down to -4° (again ambient). But below -4° ambient it wouldn't be able to keep up anymore...?
I would assume (and hope??) that the BMS wouldn't allow any charging current below an internal temp of 32°...??
I would assume (and hope??) that the BMS wouldn't allow any charging current below an internal temp of 32°...??
Your correct…It is quite amazing how much a good insulated box holds heat of a few hundred lbs of batts….insulation is king…
I would assume this too ^^^^.I think what they are trying to say is that using this battery with the heater, you can charge down to that temp. But, below -4F / -20C, the heater won't keep up, so that's the limit.
Edited to add: Oops @Cmiller said exactly that already - I didn't read all the post clearly
