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 Green Power

Here are the PSI Ratings for modules from Green Power, 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
1	Green Power	ET-M572185	Monocrystalline	185	8.19*	83
2	Green Power	ET-P672280	Polycrystalline	280	8.10*	80
3	Green Power	ET-P672280B	Polycrystalline	280	8.10*	80
4	Green Power	ET-M572180	Monocrystalline	180	7.98*	74
5	Green Power	ET-P672275B	Polycrystalline	275	7.95*	73
6	Green Power	ET-P672275	Polycrystalline	275	7.95*	73
7	Green Power	ET-P672265B	Polycrystalline	265	7.89*	70
8	Green Power	ET-P672265	Polycrystalline	265	7.89*	70
9	Green Power	ET-M572175	Monocrystalline	175	7.85*	68
10	Green Power	ET-P672270B	Polycrystalline	270	7.81*	66
11	Green Power	ET-P672270	Polycrystalline	270	7.81*	66
12	Green Power	ET-P672260B	Polycrystalline	260	7.75*	63
13	Green Power	ET-P672260	Polycrystalline	260	7.75*	63
14	Green Power	ET-M572170	Monocrystalline	170	7.63*	56
15	Green Power	ET-P660235B	Polycrystalline	235	7.53*	50
16	Green Power	ET-P660235	Polycrystalline	235	7.53*	50
17	Green Power	ET-M572165	Monocrystalline	165	7.38*	40
18	Green Power	ET-P660230B	Polycrystalline	230	7.37*	40
19	Green Power	ET-P660230	Polycrystalline	230	7.37*	40
20	Green Power	ET-M572185B	Monocrystalline	185	7.36*	39
21	Green Power	ET-P660225B	Polycrystalline	225	7.21*	31
22	Green Power	ET-P660225	Polycrystalline	225	7.21*	31
23	Green Power	ET-P654210	Polycrystalline	210	7.17*	29
24	Green Power	ET-P654210B	Polycrystalline	210	7.17*	29
25	Green Power	ET-M572180B	Monocrystalline	180	7.16*	28
26	Green Power	ET-P660220B	Polycrystalline	220	7.05*	23
27	Green Power	ET-P660220	Polycrystalline	220	7.05*	23
28	Green Power	ET-P654205B	Polycrystalline	205	6.98*	20
29	Green Power	ET-P654205	Polycrystalline	205	6.98*	20
30	Green Power	ET-M572175B	Monocrystalline	175	6.97*	20
31	Green Power	ET-P654200	Polycrystalline	200	6.83*	15
32	Green Power	ET-P654200B	Polycrystalline	200	6.83*	15
33	Green Power	ET-P654195B	Polycrystalline	195	6.65*	10
34	Green Power	ET-P654195	Polycrystalline	195	6.65*	10
35	Green Power	ET-P654190B	Polycrystalline	190	6.48*	7

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* 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.