This is better than soda cans and beer cans. This solar heater can be built in a few hours. The cargo containers have no insulation and transfer heat rapidly so the forced air heater is actually not as effective in optimal heat rise as an insulated house would be. The total length of pipe on the roof is 70 ft. This was placed up there with no cover and one 100 watt solar panel with a bilge fan.
Cargo container #1 had direct sunlight to the entire side. Cargo container #2 had 90 blockage from direct sunlight on the side.
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