NREL study According to a study conducted by the U.S. National Renewable Energy Lab (NREL), individual solar panel production typically degrades by about 0.7 percent per year.
That our 5.59 kW system hit its highest single day peak production after nearly two years of sitting on our roof is testament to the durability – and the consistent productivity – of solar. Hats off to REC as well, which manufactured the twenty-six 215-watt panels on our roof.
Finally, a call-out to the sun which plays a big role in the slow degradation of solar PV module production: We want as much solar as we can get (we’re averaging about 8,600 kWh per year over our first two years). So, by all means, bring it on, baby!