Considering the capacity of the tesla batteries, it's probably negligible, especially with solar to charge them back up.Right, but still burning battery power to heat the batteries. Seems silly.....
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Run the numbers. Find a heat mat with x watts, capacity of the battery pack, how much it'd discharge over 24 hours keeping itself warm (assuming it's in an unconditioned compartment), then add how much solar charges it in that time, etc. It's not much.