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chad Christopher wrote:11kW is pretty big. I would like to believe that I could have installed my 12kW system myself...but.
With the federal tax discount/return (which you can only receive if installed by a professional) I could not buy the materials cheaper. Not even counting the labor. We also have a 7 year maintenance plan and it saved us money on home owners insurance. The company who installed my system also tweaked the system to be more efficient and cheaper than i had planned. Using equipment and programs which I couldn't afford.
All being said...I would equate installing a system of that size, to require a skilled level of roofing knowledge, to at least be familiar with installing a whole home 220 volt system (assuming you're running conventional appliances due to the size) knowledge of local codes, and if you require Suplimenterary heat ditch your gas and invest in heat pumps, and heatpump water heaters.
Any questions lmk. 12.7kw system in sw Pennsylvania.