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Thermoelectric cells or Stirling engines could also be a good option for an off grid location that gets cold in the winter. Heat it with a wood stove, and charge your batteries off it too.

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There's already some wood pellet boilers on the market which can integrate a sterling engine, to supplement off-grid battery-backed photovoltaic solar panels for local electricity generation. The power output of the sterling engine isn't stellar, but that's to be expected, it's just to help when it's less sunny and you need space heating anyways.

For example: https://www.oekofen.com/en-gb/pellematic-condens/

My house has a super-insulated, passive solar design. I heat it with wood pellet stove, which requires electric power to run the fans and pellet feed system. I've often wanted to add a Stirling engine and a small battery to make it truly grid independent. However, the house design means I only burned about $20 worth of pellets this winter, so the ROI isn't remotely justifiable.

What is the total mass of $20 worth of pellets?

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