If two 6-kW solar power systems are installed in different states and one of them gets 30% more sunshine during the year, energy production also increases by around 30%. How Many Solar Panels Do I ...
it typically costs between $15,000 and $22,500 to install a 6 kW to 8 kW solar power system. The Solar Energy Industries Association (SEIA) estimates that solar panels can cost around $25,000.