Photovoltaic systems have been around for 30 years and so far the original systems are still working fine, with only deterioration in their capacity to convert sunlight to electricity (the conversion efficiency factor). This rate of deterioration depends on the quality of the panels. Regen Power only sells Tier-1 panels. Accelerated testing by manufacturers estimates a lifespan of 40-42 years for these panels. Other system components have a shorter lifespan, however, and may need to be replaced during the system’s service lifetime. For instance, inverters’ life span is 5-10 years, with Regen Power providing manufacturers’ warranty of 10 years