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 KISCO

Here are the PSI Ratings for modules from KISCO, 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
1KISCOGETWATT 262M-A1UMonocrystalline2628.16*82
2KISCOGETWATT 261M-A1UMonocrystalline2618.13*81
3KISCOGETWATT 260M-A1UMonocrystalline2608.10*79
4KISCOGETWATT 255M-C1UMonocrystalline2558.08*79
5KISCOGETWATT 259M-A1UMonocrystalline2598.07*79
6KISCOGETWATT 258M-A1UMonocrystalline2588.04*77
7KISCOGETWATT 257M-A1UMonocrystalline2578.01*76
8KISCOGETWATT 256M-A1UMonocrystalline2567.98*74
9KISCOGETWATT 255M-A1UMonocrystalline2557.95*73
10KISCOGETWATT 254M-A1UMonocrystalline2547.92*71
11KISCOGETWATT 253M-A1UMonocrystalline2537.89*70
12KISCOGETWATT 252M-A1UMonocrystalline2527.85*68
13KISCOGETWATT 251M-A1UMonocrystalline2517.82*66
14KISCOGETWATT 250M-A1UMonocrystalline2507.78*64
15KISCOGETWATT 249M-A1UMonocrystalline2497.75*63
16KISCOGETWATT 248M-A1UMonocrystalline2487.73*61
17KISCOGETWATT 245P-A1UPolycrystalline2457.71*61
18KISCOGETWATT 247M-A1UMonocrystalline2477.69*59
19KISCOGETWATT 244P-A1UPolycrystalline2447.68*59
20KISCOGETWATT 246M-A1UMonocrystalline2467.67*58
21KISCOGETWATT 243P-A1UPolycrystalline2437.65*57
22KISCOGETWATT 245M-A1UMonocrystalline2457.63*56
23KISCOGETWATT 242P-A1UPolycrystalline2427.62*55
24KISCOGETWATT 244M-A1UMonocrystalline2447.60*54
25KISCOGETWATT 254M-C1UMonocrystalline2547.59*53
26KISCOGETWATT 241P-A1UPolycrystalline2417.59*53
27KISCOGETWATT 243M-A1UMonocrystalline2437.57*52
28KISCOGETWATT 253M-C1UMonocrystalline2537.56*52
29KISCOGETWATT 240P-A1UPolycrystalline2407.55*51
30KISCOGETWATT 252M-C1UMonocrystalline2527.53*49
31KISCOGETWATT 242M-A1UMonocrystalline2427.53*50
32KISCOGETWATT 239P-A1UPolycrystalline2397.52*49
33KISCOGETWATT 251M-C1UMonocrystalline2517.50*48
34KISCOGETWATT 241M-A1UMonocrystalline2417.50*48
35KISCOGETWATT 238P-A1UPolycrystalline2387.48*47
36KISCOGETWATT 250M-C1UMonocrystalline2507.47*46
37KISCOGETWATT 237P-A1UPolycrystalline2377.46*45
38KISCOGETWATT 240M-A1UMonocrystalline2407.46*46
39KISCOGETWATT 239M-A1UMonocrystalline2397.44*44
40KISCOGETWATT 249M-C1UMonocrystalline2497.44*44
41KISCOGETWATT 236P-A1UPolycrystalline2367.43*43
42KISCOGETWATT 248M-C1UMonocrystalline2487.41*42
43KISCOGETWATT 238M-A1UMonocrystalline2387.41*42
44KISCOGETWATT 235P-A1UPolycrystalline2357.39*41
45KISCOGETWATT 247M-C1UMonocrystalline2477.38*40
46KISCOGETWATT 234P-A1UPolycrystalline2347.36*39
47KISCOGETWATT 246M-C1UMonocrystalline2467.35*39
48KISCOGETWATT 245M-C1UMonocrystalline2457.33*37
49KISCOGETWATT 233P-A1UPolycrystalline2337.32*37
50KISCOGETWATT 244M-C1UMonocrystalline2447.29*35
51KISCOGETWATT 232P-A1UPolycrystalline2327.29*35
52KISCOGETWATT 231P-A1UPolycrystalline2317.27*34
53KISCOGETWATT 243M-C1UMonocrystalline2437.27*34
54KISCOGETWATT 242M-C1UMonocrystalline2427.24*32
55KISCOGETWATT 230P-A1UPolycrystalline2307.24*33
56KISCOGETWATT 229P-A1UPolycrystalline2297.21*31
57KISCOGETWATT 241M-C1UMonocrystalline2417.21*31
58KISCOGETWATT 240M-C1UMonocrystalline2407.18*29
59KISCOGETWATT 228P-A1UPolycrystalline2287.17*29
60KISCOGETWATT 227P-A1UPolycrystalline2277.14*27
61KISCOGETWATT 226P-A1UPolycrystalline2267.11*26
62KISCOGETWATT 225P-A1UPolycrystalline2257.08*25
63KISCOGETWATT 224P-A1UPolycrystalline2247.04*23
64KISCOS101EThin Film1013.79*1
65KISCOS100EThin Film1003.74*1
66KISCOS99EThin Film993.72*1
67KISCOS98EThin Film983.67*1
68KISCOS97EThin Film973.64*1
69KISCOS96EThin Film963.62*0
70KISCOS95EThin Film953.57*0
71KISCOS94EThin Film943.55*0
72KISCOS93EThin Film933.49*0
73KISCOS92EThin Film923.47*0
74KISCOS91EThin Film913.40*0

* 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.