solar panels cost per watt
Sources: Naked solar panels (2014) are about 82 per watt ($820 per kWp). (EcoBusiness and PV Insights). Installation costs (labor, inverter, wiring, permitting) are about $4 per watt. (TechnologyReview and SolarPower.org) Total installed cost from Dovetail Solar ($3.66), LBL ($5.30).hen multiply that by the peak output of your panel, then by the number of days per month. For example, for a panel rated at 150 watts in New York, we'd have: 4 hours peak sun x 150 watts panel x 30.5 days per month 1000 kWh/watt-hour = 18.3 kWh/mo.