Solar Photovoltaic System
average annual incident radiation
(National Renewable Energy Laboratory)
Panel surface area
panel efficiency
Energy produced in year
Power of system (in kw)
Cost of system ($9000 per kW from siemenssolar)
Payback in years
Per Year
Per Year
Per Year
The Payback with electricity costing $ .19 = 45 Years
The Payback with electricity costing $ .238 = 36 Years
The Payback with electricity costing $ .285 = 30 Years