BTW, for those that are interested, a 5 KW system costs about $23,000. CPS currently rebates 33% of the total cost (that will end when they shoot their wad on solar farms). Here's how the math works.
Total cost for 5KW system $23,000
Less 30% tax credit $ 6,900
subtotal $16,100
minus CPS rebate $7,590.
Total out of pocket $8,510 financed 10 years at 6% would be $95 month
It will generate about $68 dollars of electricity per month at current rates. I would negative cash flow $27 a month for the first 10 years, then positive cash flow $70 a month (at current rates) for the next 15 years after that.