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 T-Solar Global

Here are the PSI Ratings for modules from T-Solar Global, 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	T-Solar Global	TS410	Thin Film	410	3.91*	1
2	T-Solar Global	TS102	Thin Film	103	3.89*	1
3	T-Solar Global	TS97	Thin Film	98	3.84*	1
4	T-Solar Global	TS390	Thin Film	390	3.83*	1
5	T-Solar Global	TS370	Thin Film	370	3.60*	0
6	T-Solar Global	TS92	Thin Film	93	3.58*	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.