The Principal Solar Institute Ratings allow easy, unbiased, comprehensive analysis and comparison of photovoltaic modules and solar power generation systems. This first-in-the-industry service is provided by the Principal Solar Institute (PSI), an organization created by Principal Solar, Inc. to advance the photovoltaic solar industry, and is not affiliated with any module or system component manufacturers. The Institute commissioned a panel of leading solar energy experts to define and certify the PSI Ratings and is making them available to the public at no charge.
Before using the PSI Ratings, you should subscribe to receive updates from the Principal Solar Institute.
Follow @PrincipalSolar and search #PSIRatings to stay up-to-date with the latest PSI Ratings news and updates.
