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 Schott Solar

Here are the PSI Ratings for modules from Schott 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
1	Schott Solar	Perform Mono 260	Monocrystalline	260	7.93*	72
2	Schott Solar	Perform Mono 255	Monocrystalline	255	7.75*	63
3	Schott Solar	PERFORM POLY 250	Polycrystalline	250	7.64*	57
4	Schott Solar	Perform Mono 250	Monocrystalline	250	7.58*	53
5	Schott Solar	PERFORM POLY 245	Polycrystalline	245	7.50*	48
6	Schott Solar	Perform Mono 245	Monocrystalline	245	7.44*	44
7	Schott Solar	Poly 240	Polycrystalline	240	7.37*	40
8	Schott Solar	Perform Poly 240	Polycrystalline	240	7.37*	39
9	Schott Solar	Perform Mono 240	Monocrystalline	240	7.27*	34
10	Schott Solar	Perform Poly 235	Polycrystalline	235	7.20*	31
11	Schott Solar	Poly 235	Polycrystalline	235	7.20*	31
12	Schott Solar	Perform Poly 217	Polycrystalline	217	7.19*	30
13	Schott Solar	Poly 217	Polycrystalline	217	7.19*	30
14	Schott Solar	Poly 230	Polycrystalline	230	7.05*	23
15	Schott Solar	Perform Poly 230	Polycrystalline	230	7.05*	23
16	Schott Solar	Poly 225	Polycrystalline	225	6.90*	17
17	Schott Solar	Perform Poly 225	Polycrystalline	225	6.90*	17
18	Schott Solar	Poly 210	Polycrystalline	210	6.81*	14
19	Schott Solar	Perform Poly 210	Polycrystalline	210	6.81*	14
20	Schott Solar	Perform Poly 220	Polycrystalline	220	6.75*	13
21	Schott Solar	Poly 220	Polycrystalline	220	6.75*	13
22	Schott Solar	SAPC-175	Monocrystalline	175	6.59*	9
23	Schott Solar	ASE-300-DGF/50-310	Polycrystalline	310	6.58*	9
24	Schott Solar	Perform Poly 202	Polycrystalline	202	6.56*	8
25	Schott Solar	Poly 202	Polycrystalline	202	6.56*	8
26	Schott Solar	SAPC-170	Polycrystalline	170	6.32*	5
27	Schott Solar	ASE-300-DGF/50-300	Polycrystalline	300	6.31*	5
28	Schott Solar	SAPC-165	Polycrystalline	165	6.12*	4
29	Schott Solar	SAPC-165S	Polycrystalline	165	6.12*	4
30	Schott Solar	ASE-300-DGF/50-290	Polycrystalline	290	6.07*	3
31	Schott Solar	ASE-300-DGF/50-280	Polycrystalline	280	5.91*	3
32	Schott Solar	ASE-300-DGF/50-270	Polycrystalline	270	5.64*	2
33	Schott Solar	ASE-300-DGF/50-260	Polycrystalline	260	5.39*	2
34	Schott Solar	ASE-300-DGF/50-250	Polycrystalline	250	5.29*	2
35	Schott Solar	ASE-300-DGF/42-240	Polycrystalline	240	5.27*	2
36	Schott Solar	ASE-300-DGF/34-195	Polycrystalline	199	4.28*	1
37	Schott Solar	ASE-300-DGF/25-145	Polycrystalline	147	3.24*	0

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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.