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Here is a link to thermal images and screenshots of a battery heater I put together for a 120Ah pack I built to go in a Pelican case. It took 1.5 hours to raise battery from 10.6°F to 42.6°F and then 40 minutes for the cell temperatures to equalize. A little over 7 Ah to get those results.

I have a solar generator I am building/upgrading. I am putting a 2000 watt pure sine inverter, 40 amp MPPT charge controller, and one 4S 12volt 120Ah battery bank inside one pelican case. This will work well for my truck camper, 4H events and similar activities. I would like to make another...

A friend bought a house with 720 watts of panels, 233AH 24 volt AGM battery bank, a 3000 watt inverter/charger/transfer switch. It also has a windmill on the roof (didn't climb up to look at specs. The windmill rotates to face the wind but the fan doesn't look like it turns. I have never seen...