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No Mortar Snap Together Blocks!
Used as High Thermal Mass Solar System Heat Battery!

The Sun does not shine all the time so your solar array can not heat your house
at night without a battery. What if you use a thermal mass battery?

Take electricity your solar array makes and use it to heat the soil mass 50 feet under your house.
Then build your house out of 4' wide insulated concrete wall segments and siphon the heat from
the soil mass to the house concrete walls.

Thermosiphon Link