Toyota wants to salute do-gooders by giving 100 cars over 100 days to organizations that could really use a new set of wheels. And voters like you decide who gets a new ride every day.
PEI is the abbreviation for Porcelain Enamel Institute. A PEI Rating is given to a tile product based the hardness of its glaze. This hardness is determined by the manufacturer using a standardized test.
The Principal Solar Institute's scientifically designed and certified combination of tests and performance standards provide an unbiased, comprehensive rating system-the PSI PV module rating. PSI Ratings corresponds to the predicted 25-year Lifetime Energy Production (LEP) of each PV module. These ratings allow you to make comparisons when analyzing PV modules and help you select the optimal PV module. Learn more about the PSI Ratings and how to use them.