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 Siliken Manufacturing

Here are the PSI Ratings for modules from Siliken Manufacturing, 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	Siliken Manufacturing	SLK72P6L 315Wp SLV/WHT	Polycrystalline	315	8.14*	81
2	Siliken Manufacturing	SLK72P6L 315Wp BLK/WHT	Polycrystalline	315	8.14*	81
3	Siliken Manufacturing	SLK72P6L 310Wp SLV/WHT	Polycrystalline	310	8.02*	76
4	Siliken Manufacturing	SLK72P6L 310Wp BLK/WHT	Polycrystalline	310	8.02*	76

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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.