That is exactly the problem. Until someone figures out how to get the cost down, they make no economic sense. Here in the socialist state of NJ, they put a tax on every electric users bill to raise money to fund solar. So, last time I checked, you can get a medium sytem of about 6KW, which actually costs $50K, for about 20K, because the other poor saps are paying the rest. . . . .
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I'm in the socialist state of NJ (actually SJ) and I'm one of those poor saps that pays the electric tax to help fund these systems for others. But, honestly, I don't mind doing it and I think it is a good idea. Of course, that funding system is like a pyramid scheme that initially works for those who get in early then has diminishing and then nonexistent returns. My thinking is that the more funding that can go into alternative energy sources now, the larger the pool of people using those systems will be, and eventually the overall cost of the systems will come down. And I do think that by funding these things now we will eventually become less dependent on non-renewable sources of energy such as oil, coal, and gas.