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 Solar Liberty

Here are the PSI Ratings for modules from Solar Liberty, 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
1Solar LibertySLX 330 USCPolycrystalline3308.60*92
2Solar LibertySLX 330 USMDMonocrystalline3308.55*92
3Solar LibertySLX 330 USMCMonocrystalline3308.55*92
4Solar LibertySLX 325 USCPolycrystalline3258.47*90
5Solar LibertySLX 325 USMCMonocrystalline3258.43*90
6Solar LibertySLX 325 USMDMonocrystalline3258.43*90
7Solar LibertySLX 270 USMCMonocrystalline2708.38*88
8Solar LibertySLX 270 USMDMonocrystalline2708.38*88
9Solar LibertySLX 320 USCPolycrystalline3208.34*88
10Solar LibertySLX 320 USMCMonocrystalline3208.29*86
11Solar LibertySLX 320 USMDMonocrystalline3208.29*86
12Solar LibertySLX 270 USBPolycrystalline2708.27*86
13Solar LibertySLX 270 USCPolycrystalline2708.22*84
14Solar LibertySLX 270 USDPolycrystalline2708.22*84
15Solar LibertySLX 265 USMDMonocrystalline2658.21*84
16Solar LibertySLX 265 USMCMonocrystalline2658.21*84
17Solar LibertySLX 265 USBPolycrystalline2658.11*80
18Solar LibertySLX 265 USMBMonocrystalline2658.11*80
19Solar LibertySLX 315 USMCMonocrystalline3158.09*79
20Solar LibertySLX 315 USMDMonocrystalline3158.09*79
21Solar LibertySLX 265 USDPolycrystalline2658.07*79
22Solar LibertySLX 265 USCPolycrystalline2658.07*78
23Solar LibertySLX 310 USCPolycrystalline3108.01*76
24Solar LibertySLX 260 USBPolycrystalline2607.97*74
25Solar LibertySLX 310 USMDMonocrystalline3107.96*73
26Solar LibertySLX 310 USMCMonocrystalline3107.96*73
27Solar LibertySLX 260 USDPolycrystalline2607.91*71
28Solar LibertySLX 260 USCPolycrystalline2607.91*71
29Solar LibertySLX 245 USCPolycrystalline2457.83*67
30Solar LibertySLX 305 USMCMonocrystalline3057.83*67
31Solar LibertySLX 305 USMDMonocrystalline3057.83*67
32Solar LibertySLX 255 USBPolycrystalline2557.81*66
33Solar LibertySLX 255 USDPolycrystalline2557.76*63
34Solar LibertySLX 255 USCPolycrystalline2557.76*63
35Solar LibertySLX 240 USDPolycrystalline2407.71*60
36Solar LibertySLX 240 USCPolycrystalline2407.71*60
37Solar LibertySLX 300 USMCMonocrystalline3007.70*60
38Solar LibertySLX 300 USMDMonocrystalline3007.70*60
39Solar LibertySLX 250 USBPolycrystalline2507.65*57
40Solar LibertySLX 250 USCPolycrystalline2507.60*54
41Solar LibertySLX 250 USDPolycrystalline2507.60*54
42Solar LibertySLX 295 USMCMonocrystalline2957.57*52
43Solar LibertySLX 295 USMDMonocrystalline2957.57*52
44Solar LibertySLX 235 USCPolycrystalline2357.51*48
45Solar LibertySLX 235 USDPolycrystalline2357.51*48
46Solar LibertySLX 290 USMDMonocrystalline2907.45*45
47Solar LibertySLX 290 USMCMonocrystalline2907.45*45
48Solar LibertySLX 235 USBPolycrystalline2357.43*43
49Solar LibertySLX285P6-36Polycrystalline2857.41*42
50Solar LibertySLX 245 USBPolycrystalline2457.39*41
51Solar LibertySLX 240 USBPolycrystalline2407.35*39
52Solar LibertySLX235P6-30Polycrystalline2357.29*35
53Solar LibertySLX280P6-36Polycrystalline2807.28*35
54Solar LibertySLX230P6-30Polycrystalline2307.14*27
55Solar LibertySLX275P6-36Polycrystalline2757.14*27
56Solar LibertySLX140P6-18Polycrystalline1407.07*24
57Solar LibertySLX270P6-36Polycrystalline2707.02*22
58Solar LibertySLX225P6-30Polycrystalline2256.98*20
59Solar LibertySLX265P6-36Polycrystalline2656.88*17
60Solar LibertySLX135P6-18Polycrystalline1356.83*15
61Solar LibertySLX220P6-30Polycrystalline2206.81*15
62Solar LibertySLX260P6-36Polycrystalline2606.76*13
63Solar LibertySLX215P6-30Polycrystalline2156.65*10
64Solar LibertySLX255P6-36Polycrystalline2556.63*10
65Solar LibertySLX130P6-18Polycrystalline1306.56*9
66Solar LibertySLX210P6-30Polycrystalline2106.50*7
67Solar LibertySLX250P6-36Polycrystalline2506.49*7
68Solar LibertySLX245P6-36Polycrystalline2456.36*6
69Solar LibertySLX205P6-30Polycrystalline2056.34*6
70Solar LibertySLX125P6-18Polycrystalline1256.31*5
71Solar LibertySLX240P6-36Polycrystalline2406.24*5
72Solar LibertySLX200P6-30Polycrystalline2006.19*4
73Solar LibertySLX120P6-18Polycrystalline1206.06*3

* 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.