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That would depend on many things. If you live near me (Wisconsin we average under 4 hours per day of sunlight) and you use 75 watt panels for gird use. Based on a average of 3000 watts an hour average home use to would need 3,000,000 watts an hour or 720,000,000 watts of actual power per day. I will assume you will get the same efficiency I see in my panels so 75 watts is about 52 watts out. (Panels are rated for open circuit voltage and short circuit current. This is impossible to achieve) 52 watts on a 4 hour day average (being generous) to will get 208 watts per day. (I typically see about 150 watts a day).
Ok, 720,000,000 divided by 208 watts is roughly 3461500 panels. (assuming no loss) The DC to AC inverters, batteries, grid and all have substantial loss, but these are not know values.
At a wholesale cost you will be paying $3.00 a watt for the panels so the cost outlay for panels alone is $2.16 million or roughly $21,600.00 per home. The inverters (I will assume small gridable would be an additional $3K each roughly for each of the 1000 homes. The average home can be setup to run via solar for about $25K if the person can do so themselves. If you need installation and permits, your cost may go up a great deal.
The average electric bill in the USA is about $200.00 a month using those same values and $0.9 per kilowatt. The payback is about ten years, assuming everything stays equal. If the panels break due to hail, wind or play, you lose. If the inverter gets hit by lightening, you lose.
Payback gets longer as power goes down. This is pretty much best case. If you look at the cost of building these (CO2 wise) you will also fnd that there is no savings there. They are far from green. Panels are eergy intensive to create. If they break overall CO2 would be higher, not lower.
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