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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Seems like you could get heaters connected through timers that plugged in externally. I have a Solarx 4k in an outside cabinet I built with no bottom to let air through, and I got a small solar fan, put it on the front door after cutting a hole, blowing out, just to keep it cool in the summer, even though it is deep in shade. Good luck.
External heaters would work, but since the batteries have heaters built in, and we paid more for batteries that have internal heaters it would be ideal to use them!