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 LS Industrial Systems

Here are the PSI Ratings for modules from LS Industrial Systems, 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	LS Industrial Systems	PVM S245	Monocrystalline	245	7.62*	55
2	LS Industrial Systems	PVM S244	Monocrystalline	244	7.58*	53
3	LS Industrial Systems	PVM S243	Monocrystalline	243	7.55*	51
4	LS Industrial Systems	PVM S242	Monocrystalline	242	7.53*	50
5	LS Industrial Systems	PVM S241	Monocrystalline	241	7.51*	48
6	LS Industrial Systems	PVM S240	Monocrystalline	240	7.51*	48
7	LS Industrial Systems	PVM S239	Monocrystalline	239	7.47*	46
8	LS Industrial Systems	PVM S238	Monocrystalline	238	7.45*	45
9	LS Industrial Systems	PVM S237	Monocrystalline	237	7.43*	43
10	LS Industrial Systems	PVM S236	Monocrystalline	236	7.40*	42
11	LS Industrial Systems	PVM S235	Monocrystalline	235	7.38*	40
12	LS Industrial Systems	PVM S234	Monocrystalline	234	7.35*	39
13	LS Industrial Systems	PVM S233	Monocrystalline	233	7.33*	37
14	LS Industrial Systems	PVM S232	Monocrystalline	232	7.30*	36
15	LS Industrial Systems	PVM S231	Monocrystalline	231	7.28*	35
16	LS Industrial Systems	PVM S230	Monocrystalline	230	7.26*	34
17	LS Industrial Systems	PVM S229	Monocrystalline	229	7.23*	32
18	LS Industrial Systems	PVM S228	Monocrystalline	228	7.21*	31

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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.