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<t>Billy is awfully pessamistic. <br/> <br/> PV systems are generally 8-12% efficient, and they generally work better when cold. However, they get less sun in the frozen north, since all that solar energy has to travel through more atmosphere before it gets to you. A lot of that energy is lost to he...

<t>First off, if you need 400 watts to work this process, than it isn't free energy. You're paying for it with that power input. <br/> <br/> Second, with the temp differentials you're talking about, You'd need close to 2000W input to get 750W out (1 hp) Thats assuming 400F to room temp (75F) with an...