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 First Solar

Here are the PSI Ratings for modules from First Solar, 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
1First SolarFS-4112-2Thin Film1138.58*92
2First SolarFS-4112A-2Thin Film1138.58*92
3First SolarFS-4110A-2Thin Film1108.44*90
4First SolarFS-4110-2Thin Film1108.44*90
5First SolarFS-4107A-2Thin Film1088.25*85
6First SolarFS-4107-2Thin Film1088.25*85
7First SolarFS-4105-2Thin Film1058.03*77
8First SolarFS-4105A-2Thin Film1058.03*77
9First SolarFS-4102-2Thin Film1037.85*68
10First SolarFS-4102A-2Thin Film1037.85*68
11First SolarFS-3100-PlusThin Film1007.82*67
12First SolarFS-4117-2Thin Film1187.80*66
13First SolarFS-4117A-2Thin Film1187.80*66
14First SolarFS-4100-2Thin Film1007.67*58
15First SolarFS-4100A-2Thin Film1007.67*58
16First SolarFS-397-PlusThin Film987.65*57
17First SolarFS-4115A-2Thin Film1157.59*54
18First SolarFS-4115-2Thin Film1157.59*54
19First SolarFS-395Thin Film957.56*52
20First SolarFS-395-PlusThin Film957.44*44
21First SolarFS-392Thin Film937.36*39
22First SolarFS-4105AThin Film1057.27*34
23First SolarFS-4105Thin Film1057.27*34
24First SolarFS-392-PlusThin Film937.26*34
25First SolarFS-4102Thin Film1037.14*27
26First SolarFS-4102AThin Film1037.14*27
27First SolarFS-390-PlusThin Film907.05*24
28First SolarFS-4100Thin Film1006.90*17
29First SolarFS-4100AThin Film1006.90*17
30First SolarFS-387-PlusThin Film886.87*16
31First SolarFS-497AThin Film986.74*12
32First SolarFS-497Thin Film986.74*12
33First SolarFS-390Thin Film906.7112
34First SolarFS-495AThin Film956.57*9
35First SolarFS-495Thin Film956.57*9
36First SolarFS-387Thin Film886.538
37First SolarFS-492Thin Film936.40*6
38First SolarFs-492AThin Film936.40*6
39First SolarFS-385Thin Film856.356
40First SolarFS-280Thin Film806.35*6
41First SolarFS-380Thin Film806.28*5
42First SolarFS-490Thin Film906.26*5
43First SolarFS-490AThin Film906.26*5
44First SolarFS-277Thin Film786.14*4
45First SolarFS-382Thin Film836.134
46First SolarFS-377Thin Film776.11*4
47First SolarFS-275Thin Film755.97*3
48First SolarFS-375Thin Film755.89*3
49First SolarFS-270Thin Film705.85*3
50First SolarFS-272Thin Film735.79*3
51First SolarFS-372Thin Film735.66*2
52First SolarFS-370Thin Film705.46*2
53First SolarFS-267Thin Film685.44*2
54First SolarFS-367Thin Film685.24*2

* 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.