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Freezing temps are only 3 months of the year (in the valley), with generally cool temps about 5 months. Right now is absolutely perfect, sunny and 73 degrees. Still shorts and tee shirt weather.
The other thing I've been meaning to test is lithium vs Pb charging efficiency. Lead acid is extremely poor at accepting a charge when it's near full, which is exactly how they are utilized in vehicles. That, on top of alternators being something like only 50% or less efficient, and we might have a significant amount of fuel consumption merely keeping it topped off. Lithium batteries do not suffer the same horrible drop in charge efficiency.
I think I'll do several tests draining each battery 5%, then measuring how much energy it takes to bring them back to full.
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