Principal Solar Institute

A community for development and installation professionals in the solar industry

The Principal Solar Institute Module Ratings

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. Seven essential characteristics related to initial and long-term PV module performance are combined to create the PSI Rating:

  • Actual Tested Maximum Power vs. Advertised
  • Temperature Coefficient at Maximum Power
  • Power at Low Irradiance to Power at High Irradiance Ratio
  • Normal Operating Cell Temperature (NOCT)
  • Total Area Efficiency
  • Negative Power Tolerance
  • Annual Power Reduction

These ratings allow you to make comparisons when analyzing PV modules and help you select the optimal PV module.

Subscribe to our email list

Before using the PSI Ratings, you should subscribe to our email list to receive important updates from the Principal Solar Institute.

PSI Ratings – PV Solar Modules from CertainTeed

Here are the PSI Ratings for modules from CertainTeed, calculated based on initial performance test data. If you don’t see a solar module that you are considering, contact us and we will try to add it.

Rank Manufacturer Model Type Power
(W DC)
PSI Rating Percentile
6CertainTeedApollo II-57Monocrystalline576.29*5
7CertainTeedApollo II-56Monocrystalline566.18*4
8CertainTeedApollo II-55Monocrystalline556.07*3
9CertainTeedApollo II-54Monocrystalline546.00*3
10CertainTeedApollo II-63Monocrystalline635.83*3
11CertainTeedApollo Tile II-63Monocrystalline635.82*3
12CertainTeedApollo II-62Monocrystalline625.73*2
13CertainTeedApollo Tile II-62Monocrystalline625.72*2
14CertainTeedApollo II-61Monocrystalline615.65*2
15CertainTeedApollo Tile II-61Monocrystalline615.64*2
16CertainTeedApollo II-60Monocrystalline605.53*2
17CertainTeedApollo Tile II-60Monocrystalline605.52*2
18CertainTeedApollo II-59Monocrystalline595.46*2
19CertainTeedApollo Tile II-59Monocrystalline595.45*2
20CertainTeedApollo Tile II-58Monocrystalline585.36*2
21CertainTeedApollo II-58Monocrystalline585.36*2
22CertainTeedApollo Tile II-57Monocrystalline575.02*2
23CertainTeedApollo Tile II-56Monocrystalline564.93*1
24CertainTeedApollo Tile II-55Monocrystalline554.85*1
25CertainTeedApollo Tile II-54Monocrystalline544.79*1
26CertainTeedAPOLLO TILE-BPolycrystalline524.63*1
27CertainTeedAPOLLO TILE-GPolycrystalline524.63*1

* Modules denoted with an “*” use estimated values for one or more characteristics. Manufacturers can contact us to provide the missing data for these PV modules.

NOTE: PSI Ratings are based on publicly available data, and are subject to change as additional data and proprietary analyses become available for long-term performance.