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.

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PSI Ratings – PV Solar Modules from American Solar Wholesale

Here are the PSI Ratings for modules from American Solar Wholesale, 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
1American Solar WholesaleASW-245MMonocrystalline2458.34*88
2American Solar WholesaleASW-240M-60Monocrystalline2408.17*82
3American Solar WholesaleASW-280MMonocrystalline2808.08*79
4American Solar WholesaleASW-235PPolycrystalline2358.07*78
5American Solar WholesaleASW-235MMonocrystalline2358.00*75
6American Solar WholesaleASW-275MMonocrystalline2757.92*72
7American Solar WholesaleASW-230PPolycrystalline2307.89*70
8American Solar WholesaleASW-230MMonocrystalline2307.84*67
9American Solar WholesaleASW-300PPolycrystalline3007.75*63
10American Solar WholesaleASW-225PPolycrystalline2257.71*61
11American Solar WholesaleASW-300MMonocrystalline3007.70*60
12American Solar WholesaleASW-225MMonocrystalline2257.66*58
13American Solar WholesaleASW-295PPolycrystalline2957.62*55
14American Solar WholesaleASW-265MMonocrystalline2657.62*55
15American Solar WholesaleASW-250MMonocrystalline2507.61*55
16American Solar WholesaleASW-295MMonocrystalline2957.58*53
17American Solar WholesaleASW-270MMonocrystalline2707.56*51
18American Solar WholesaleASW-220PPolycrystalline2207.54*50
19American Solar WholesaleASW-245PPolycrystalline2457.52*49
20American Solar WholesaleASW-290PPolycrystalline2907.49*47
21American Solar WholesaleASW-260MMonocrystalline2607.46*45
22American Solar WholesaleASW-290MMonocrystalline2907.44*44
23American Solar WholesaleASW-215PPolycrystalline2157.37*40
24American Solar WholesaleASW-240PPolycrystalline2407.37*39
25American Solar WholesaleASW-285PPolycrystalline2857.36*39
26American Solar WholesaleASW-285MMonocrystalline2857.32*37
27American Solar WholesaleASW-270PPolycrystalline2707.24*33
28American Solar WholesaleASW-185MMonocrystalline1857.24*33
29American Solar WholesaleASW-280PPolycrystalline2807.22*32
30American Solar WholesaleASW-180MMonocrystalline1807.04*23
31American Solar WholesaleASW-260PPolycrystalline2606.97*20
32American Solar WholesaleASW-175MMonocrystalline1756.85*16
33American Solar WholesaleASW-250PPolycrystalline2506.70*12

* 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.