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diy solar

Can I leave my batteries in an unheated un-insulated shed?

Gray Man

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Aug 31, 2021
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If I build an insulated box around the batteries and the system, will it generate enough heat throughout the winter? There is a possibility of -40 or colder.
 
What kind of battery? LiFePO4 cannot be charged below 32F.
Batteries really won't generate much heat unless they are being stressed.
 
Lead acid will tolerate -40F if fully charged. If discharged they will freeze at 20F. Even if you have the charge controller in the box it won't make enough heat to help much. As MisterSandals said you can't charge LiFePo4 below 32F but -40 won't harm them.
 
I think agms would be ok .
they don’t discharge much in the cold @ 0 or -15 out side my battery’s stay around 47o if being cycled every day .
I have a insulated box in the garage
So they don’t sit out side
 
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