The quintessential question of how long will it take to break even on the
investment in a PV solar system varies, but it is typically in the range of
8-11 years for residential and 4-7 years for commercial. Some of the
variable factors affecting the payback are: a larger system costs less per
kilowatt installed than a smaller system; multi-faced roofs add
complexity and some cost; specialty systems add cost and extend
payback time; A ground mount while typically more efficient will cost
more than a roof mounted system due to the need to build the structure
to mount to; Older homes or commercial properties with electrical
systems that do not meet current safety standards may add cost to the
installation of a solar system as electrical systems need upgrades. The
best way to determine what the ROI (return on investment) is to have a
solar PV installer provide an accurate bid to build an appropriately sized
system for your desired address.