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Data from accelerated stress testing demonstrates a lower annual power degradation rate than non-SolarCity modules, and power output of 80 to 82.5% after 35 years
Jun 24, 2016

SAN MATEO—SolarCity has presented data and information supporting the claim that the photovoltaic (PV) modules used in its residential and commercial systems have useful lives of 35 years or longer. DNV GL, a world-renowned independent and certified third-party testing laboratory conducted accelerated stress testing at and beyond the IEC 61215 industry standard and found that power degradation of modules supplied to SolarCity by its key external suppliers is as much as 35% lower than for a comparable industry-wide selection of non-SolarCity modules, which are typically warranted for 25 years.

Download the full research report here.

The greater longevity of modules fabricated for SolarCity is due to SolarCity’s stringent and industry-leading Total Quality Program, which was adopted in early 2014 and is based on similar programs in the automotive industry.

SolarCity requires its third-party suppliers to maintain effective quality assurance programs and refined manufacturing processes, and to demonstrate reliable product and manufacturing quality. Rigorous tests performed by a qualified third-party lab need to be passed on an on-going basis.

About SolarCity
SolarCity® (NASDAQ: SCTY) provides clean energy. The company has disrupted the century-old energy industry by providing renewable electricity directly to homeowners, businesses and government organizations for less than they spend on utility bills. SolarCity gives customers control of their energy costs to protect them from rising rates. The company makes solar energy easy by taking care of everything from design and permitting to monitoring and maintenance. Visit the company online at and follow the company on Twitter.