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 SunPower

Here are the PSI Ratings for modules from SunPower, 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
1SunPowerSPR-X21-255Monocrystalline25511.57*100
2SunPowerSPR-X22-475-COMMonocrystalline47511.51*100
3SunPowerSPR-X22-360Monocrystalline36011.45*100
4SunPowerSPR-X22-360-COMMonocrystalline36011.45*100
5SunPowerSPR-X22-359Monocrystalline35911.42*100
6SunPowerSPR-X22-470-COMMonocrystalline47011.34*100
7SunPowerSPR-X21-345-C-ACMonocrystalline34511.23*100
8SunPowerSPR-X21-345Monocrystalline34511.23*100
9SunPowerSPR-343NJ-WHT-DMonocrystalline34311.19100
10SunPowerSPR-343NX-WHT-DMonocrystalline34311.19100
11SunPowerSPR-343J-WHT-DMonocrystalline34311.19100
12SunPowerSPR-343NX-BLK-DMonocrystalline34311.19100
13SunPowerSPR-X22-460-COMMonocrystalline47011.10*100
14SunPowerSPR-X22-345-BLKMonocrystalline34511.09*100
15SunPowerSPR-X21-345-COMMonocrystalline34511.05*100
16SunPowerSPR-X20-255Monocrystalline25510.97*100
17SunPowerSPR-445NJ-WHT-DMonocrystalline44510.96100
18SunPowerSPR-445J-WHT-DMonocrystalline44510.96100
19SunPowerSPR-335NX-BLK-DMonocrystalline33510.93100
20SunPowerSPR-X22-340-BLKMonocrystalline34010.92*100
21SunPowerSPR-X21-335-C-ACMonocrystalline33510.90*100
22SunPowerSPR-X21-335-BLKMonocrystalline33510.90*100
23SunPowerSPR-X21-335Monocrystalline33510.90*100
24SunPowerSPR-X21-335-BLK-C-ACMonocrystalline33510.90*100
25SunPowerSPR-320NE-WHT-DMonocrystalline32010.88100
26SunPowerSPR-245NE-WHT-DMonocrystalline24510.85100
27SunPowerSPR-X22-335-BLKMonocrystalline33510.76*100
28SunPowerSPR-X20-445-COMMonocrystalline44510.76*100
29SunPowerSPR-X20-327-BLKMonocrystalline32710.65*100
30SunPowerSPR-X20-327-BLK-C-ACMonocrystalline32710.65*100
31SunPowerSPR-X20-327Monocrystalline32710.64*100
32SunPowerSPR-440NE-WHT-DMonocrystalline44010.64100
33SunPowerSPR-X20-327-COMMonocrystalline32710.64*100
34SunPowerSPR-X20-327-C-ACMonocrystalline32710.64*100
35SunPowerSPR-445NX-WHT-DMonocrystalline44510.57100
36SunPowerSPR-X20-245Monocrystalline24510.56*100
37SunPowerT5-SPR-327Monocrystalline32710.54100
38SunPowerSPR-327NE-WHT-DMonocrystalline32710.52100
39SunPowerSPR-415E-WHT-DMonocrystalline41510.50100
40SunPowerSPR-X20-250-BLKMonocrystalline25010.49*100
41SunPowerSPR-250NX-BLK-DMonocrystalline25010.49*100
42SunPowerSPR-X20-250-BLK-LAMMonocrystalline25010.49*100
43SunPowerSPR-X20-250-BLK-B-ACMonocrystalline25010.49*100
44SunPowerSPR-X20-250-BLK-A-ACMonocrystalline25010.49*100
45SunPowerSPR-E20-440-COMMonocrystalline44010.44*100
46SunPowerSPR-E20-327-COM-T5Monocrystalline32710.35*100
47SunPowerSPR-E20-327Monocrystalline32710.33*100
48SunPowerSPR-E20-327-C-ACMonocrystalline32710.33*100
49SunPowerSPR-E20-327-COMMonocrystalline32710.33*100
50SunPowerSPR-E20-327-COM-LAMMonocrystalline32710.33*100
51SunPowerSPR-E20-435-COMMonocrystalline43510.31*99
52SunPowerSPR-245NE-WHT-U-ACPVMonocrystalline24510.2899
53SunPowerSPR-318E-WHT-DMonocrystalline31810.2699
54SunPowerT5-SPR-318EMonocrystalline31810.2699
55SunPowerPL-SUNP-SPR-318EMonocrystalline31810.2699
56SunPowerSPR-230NE-BLK-DMonocrystalline23010.1699
57SunPowerT5-SPR-315Monocrystalline31510.1499
58SunPowerSPR-315NE-WHT-DMonocrystalline31510.1499
59SunPowerSPR-E19-320-COMMonocrystalline32010.13*99
60SunPowerSPR-E19-320Monocrystalline32010.13*99
61SunPowerSPR-400E-WHT-DMonocrystalline40010.1399
62SunPowerSPR-E19-320-C-ACMonocrystalline32010.13*99
63SunPowerSPR-435NE-WHT-DMonocrystalline43510.1299
64SunPowerSPR-240E-WHT-DMonocrystalline24010.1099
65SunPowerSPR-240E-WHT-U-ACPVMonocrystalline24010.1099
66SunPowerSPR-E20-245-A-ACMonocrystalline24510.09*99
67SunPowerSPR-E20-245Monocrystalline24510.09*99
68SunPowerSPR-E19-245Monocrystalline24510.09*99
69SunPowerSPR-E20-245-B-ACMonocrystalline24510.09*99
70SunPowerSPR-245NE-WHT-U-240 ACPVMonocrystalline24510.09*99
71SunPowerSPR-238E-WHT-DMonocrystalline23810.0199
72SunPowerSPR-310E-WHT-UMonocrystalline3109.9999
73SunPowerSPR-310E-WHT-DMonocrystalline3109.9999
74SunPowerSPR-E19-315Monocrystalline3159.95*99
75SunPowerSPR-E19-315-COMMonocrystalline3159.95*99
76SunPowerSPR-E19-410-COMMonocrystalline4109.95*99
77SunPowerT5-SPR-320EMonocrystalline3209.9499
78SunPowerSPR-320E-WHT-DMonocrystalline3209.9499
79SunPowerPL-SUNP-SPR-308EMonocrystalline3089.9399
80SunPowerSPR-225NE-BLK-DMonocrystalline2259.9399
81SunPowerSPR-308E-WHT-DMonocrystalline3089.9399
82SunPowerSPR-308NE-WHT-DMonocrystalline3089.9399
83SunPowerT5-SPR-308EMonocrystalline3089.9399
84SunPowerSPR-E19-240Monocrystalline2409.91*99
85SunPowerSPR-425E-WHT-DMonocrystalline4259.8999
86SunPowerSPR-390E-WHT-DMonocrystalline3909.8899
87SunPowerSPR-235NE-WHT-DMonocrystalline2359.8499
88SunPowerSPR-305NE-WHT-DMonocrystalline3059.8399
89SunPowerSPR-E19-310-COMMonocrystalline3109.81*99
90SunPowerSPR-315E-WHT-UMonocrystalline3159.7799
91SunPowerT5-SPR-315EMonocrystalline3159.7799
92SunPowerSPR-315E-WHT-DMonocrystalline3159.7799
93SunPowerSPR-410NE-WHT-DMonocrystalline4109.7799
94SunPowerPL-SUNP-SPR-315EMonocrystalline3159.7799
95SunPowerSPR-300E-WHT-DMonocrystalline3009.6698
96SunPowerSPR-E18-235Monocrystalline2359.66*98
97SunPowerSPR-300NE-WHT-DMonocrystalline3009.6698
98SunPowerSPR-E19-235Monocrystalline2359.66*98
99SunPowerSPR-E18-305-COMMonocrystalline3059.65*98
100SunPowerT5-SPR-310Monocrystalline3109.6398
101SunPowerSPR-310-WHT-UMonocrystalline3109.6398
102SunPowerPL-SUNP-SPR-310Monocrystalline3109.6398
103SunPowerSPR-230NE-BLK-U-ACPVMonocrystalline2309.6398
104SunPowerSPR-230-WHT-UMonocrystalline2309.6398
105SunPowerSPR-225E-BLK-U-ACPVMonocrystalline2259.5798
106SunPowerSPR-225E-BLK-DMonocrystalline2259.5798
107SunPowerSPR-295E-WHT-UMonocrystalline2959.5298
108SunPowerSPR-295E-WHT-DMonocrystalline2959.5298
109SunPowerSPR-E18-300-COMMonocrystalline3009.49*98
110SunPowerT5-SPR-305EMonocrystalline3059.4798
111SunPowerSPR-305-WHT-UMonocrystalline3059.4798
112SunPowerT5-SPR-305Monocrystalline3059.4798
113SunPowerSPR-305E-WHT-DMonocrystalline3059.4798
114SunPowerSPR-305E-WHT-UMonocrystalline3059.4798
115SunPowerPL-SUNP-SPR-305Monocrystalline3059.4798
116SunPowerSPR-225E-WHT-DMonocrystalline2259.4498
117SunPowerSPR-E18-295-COMMonocrystalline2959.35*98
118SunPowerSPR-230E-WHT-DMonocrystalline2309.3298
119SunPowerSPR-225-BLK-UMonocrystalline2259.2397
120SunPowerSPR-290-WHT-UMonocrystalline2909.0296
121SunPowerT5-SPR-290Monocrystalline2909.0297
122SunPowerPL-SUNP-SPR-290Monocrystalline2909.0296
123SunPowerPL-SUNP-SPR-215Monocrystalline2158.8996
124SunPowerSPR-215-WHT-UMonocrystalline2158.8996
125SunPowerSPR-220-BLK-UMonocrystalline2208.7795
126SunPowerSPR-217-WHT-UMonocrystalline2178.7594
127SunPowerSPR-210-WHT-UMonocrystalline2108.6994
128SunPowerPL-PLT-63L-BLK-UMonocrystalline638.6894
129SunPowerSPR-210-BLK-UMonocrystalline2108.5892
130SunPowerSPR-208-WHT-UMonocrystalline2088.3989
131SunPowerSPR-220-WHT-UMonocrystalline2208.3788
132SunPowerSPR-205-BLK-UMonocrystalline2058.1883
133SunPowerSPR-200-WHT-UMonocrystalline2008.0578
134SunPowerSPR-200-BLK-UMonocrystalline2007.9774
135SunPowerSPR-X19-240-BLKMonocrystalline2407.92*71
136SunPowerSPR-X19-240-BLK-B-ACMonocrystalline2407.92*71
137SunPowerT5-SER-235PPolycrystalline2357.4746
138SunPowerSER-235PPolycrystalline2357.1930
139SunPowerSER-228PPolycrystalline2287.1729
140SunPowerSER-220PPolycrystalline2206.75*13
141SunPowerSPR-76R-BLK-UMonocrystalline766.6711
142SunPowerSPR-76RE-BLK-UMonocrystalline766.6711

* 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.