I have an AC500 with two B300S batteries running remotely in a location that occasionally drops below freezing at night and then slowly returns to above freezing after the sun comes up. They power internet and wifi, so I can see their status. The issue is it may take 5 hours to get the battery from 31 to 32 degrees when the ambient temp is 32.5, but solar charging will not start until the battery temp is above freezing. I lose 5 hours of solar charging waiting for the battery temp to come up, then get 1 hour to charge before the sun starts to set again. If I could manually turn the B300S internal battery heaters on for even 30 minutes using battery power to get the temp above freezing, then the solar input could charge for 6 hours instead of 1.
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