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Yeah , you got to be careful that the initial invesrment isn't so large you will never earn it back in energy savings. That' seems to be the big barrier for a lot of the clean technology. The initial cost is just too high now.
Interestingly . if you look out over the rooftops in china you see a gazillion solar water heaters. They are about 4 feet by 6 feet with pipes inside and a clear covering and all black inside. My guess is they are not trying to save energy but to get some warm water at all. They must work or they would not be so widely used.
I'm curious how much the 3.45 KW solar unit costs. Do you sell energy back to the electric company when you are not using it?
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