Off grid power system revisited

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This will go next in the off-the-grid power subseries.

Revisiting the BTU calculator gives the following result for the coffin:

That's not a whole lot of energy for climate control.  I'm not that worried about the summer.  Actually, summers are more mild than one would think.  Temperatures may top out at 100 deg/F, but the nights cool down considerably, into the sixties.  It won't stay hot very long into the evening.

I'm more worried about the winter as I will need to keep a lot of things warm.  Not only the coffin, but the worms, the chickens, and the algae.  If the sun doesn't shine, there won't be any passive solar heat available.  So, the plan here is to heat up the water with the dried algae/chipped wood logs.  This hasn't been discussed though, so this is getting a bit too far ahead.

Winters will be more of a challenge than summers.  Temps out there appear to be pretty cold as compared to what I'm used to in H-town.