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depending on your site $11 to $14 per watt of installed PV is what I was told for estimating, but it will vary with your area and you might get more sun then we do here in Wisconsin and I don't know what installers tend to charge in your area.
About 3-5 years ago was really the best time to install a system as alot of prices have gone up, copper, aluminum, steel, silicon and silver have all gone way up in price so the age of cheap solar is coming to an end.
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