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 Andalay Solar

Here are the PSI Ratings for modules from Andalay 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
1Andalay SolarTW-250-1-DC4-0-BPolycrystalline2509.71*99
2Andalay SolarTW-250-1-AC2-D-BPolycrystalline2509.71*99
3Andalay SolarTW-245-1-DC4-0-BPolycrystalline2459.50*98
4Andalay SolarTW-245-1-AC2-D-BPolycrystalline2459.50*98
5Andalay SolarTW-240-1-DC4-0-BPolycrystalline2409.29*98
6Andalay SolarTW-240-1-AC2-D-BPolycrystalline2409.29*98
7Andalay SolarAX-260-1-DC4-0-BPolycrystalline2608.13*81
8Andalay SolarAX-255-1-DC4-0-BPolycrystalline2557.95*73
9Andalay SolarST-195-1AC1-A-BMonocrystalline1957.85*68
10Andalay SolarST_195_1_DC0_0_BMonocrystalline1957.85*68
11Andalay SolarST-195-1AC3-B-BMonocrystalline1957.85*68
12Andalay SolarAX-250-1-DC4-0-BPolycrystalline2507.81*66
13Andalay SolarST_290_1_DC0_0_BPolycrystalline2907.68*59
14Andalay SolarST_190_1_DC0_0_BMonocrystalline1907.65*57
15Andalay SolarST-190-1AC1-A-BMonocrystalline1907.65*57
16Andalay SolarST-190-1AC3-B-BMonocrystalline1907.65*57
17Andalay SolarLW-240-1-AC3-B-BPolycrystalline2407.49*47
18Andalay SolarLW-240-1-DC1-0-BPolycrystalline2407.49*47
19Andalay SolarLW-240-1-AC2-D-BPolycrystalline2407.49*47
20Andalay SolarLW-240-1-DC0-0-BPolycrystalline2407.49*47
21Andalay SolarLW-240-1-DC0-0-BLPolycrystalline2407.49*47
22Andalay SolarLW-240-1-AC1-A-BPolycrystalline2407.49*47
23Andalay SolarLW-240-1-AC0-D-BPolycrystalline2407.49*47
24Andalay SolarST_185_1_DC0_0_BMonocrystalline1857.45*45
25Andalay SolarST-185-1AC1-A-BMonocrystalline1857.45*45
26Andalay SolarST-185-1AC3-B-AMonocrystalline1857.45*45
27Andalay SolarST-185-1Monocrystalline1857.45*45
28Andalay SolarST-185-1AC3-B-BMonocrystalline1857.45*45
29Andalay SolarST-185-1AC1-A-AMonocrystalline1857.45*45
30Andalay SolarST_280_1_DC0_0_BPolycrystalline2807.41*42
31Andalay SolarLW-235-1-AC3-B-BPolycrystalline2357.39*41
32Andalay SolarLW-235-1-DC1-0-BPolycrystalline2357.39*41
33Andalay SolarLW-235-1-AC2-D-BPolycrystalline2357.39*41
34Andalay SolarLW-235-1-DC0-0-BLPolycrystalline2357.39*41
35Andalay SolarLW-235-1-AC0-D-BPolycrystalline2357.39*41
36Andalay SolarLW-235-1-DC0-0-BPolycrystalline2357.39*41
37Andalay SolarLW-235-1-AC1-A-BPolycrystalline2357.39*41
38Andalay SolarST180-1Monocrystalline1807.22*31
39Andalay SolarST_180_1_DC0_0_BMonocrystalline1807.22*31
40Andalay SolarST_270_1_DC0_0_BPolycrystalline2707.21*31
41Andalay SolarLW-230-1-AC3-B-BPolycrystalline2307.17*29
42Andalay SolarLW-230-1-DC0-0-BPolycrystalline2307.17*29
43Andalay SolarLW-230-1-AC2-D-BPolycrystalline2307.17*29
44Andalay SolarLW-230-1-DC0-0-BLPolycrystalline2307.17*29
45Andalay SolarLW-230-1-DC1-0-BPolycrystalline2307.17*29
46Andalay SolarLW-230-1-AC0-D-BPolycrystalline2307.17*29
47Andalay SolarLW-230-1-AC1-A-BPolycrystalline2307.17*29
48Andalay SolarKC210-1Polycrystalline2107.13*27
49Andalay SolarST175-1Monocrystalline1756.99*21
50Andalay SolarST_175_1_DC0_0_BMonocrystalline1756.99*21
51Andalay SolarST-175-1AC1-A-AMonocrystalline1756.99*21
52Andalay SolarST-175-1AC3-B-AMonocrystalline1756.99*21
53Andalay SolarKC205-1Polycrystalline2056.95*19
54Andalay SolarST_260_1_DC0_0_BPolycrystalline2606.94*19
55Andalay SolarKC180-1Polycrystalline1806.90*17
56Andalay SolarST170-1Monocrystalline1706.82*15
57Andalay SolarST_170_1_DC0_0_BMonocrystalline1706.82*15
58Andalay SolarST_165_1_DC0_0_BMonocrystalline1656.19*4
59Andalay SolarST165-1Monocrystalline1656.19*4

* 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.