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.

Subscribe to our email list

Before using the PSI Ratings, you should subscribe to our email list to receive important updates from the Principal Solar Institute.

PSI Ratings – PV Solar Modules from Polar Photovoltaics

Here are the PSI Ratings for modules from Polar Photovoltaics, 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	Polar Photovoltaics	TFSM-T-5	Thin Film	52	3.95*	1
2	Polar Photovoltaics	TFSM-T-4	Thin Film	50	3.84*	1
3	Polar Photovoltaics	TFSM-T-3	Thin Film	48	3.68*	1
4	Polar Photovoltaics	TFSM-T-5X	Thin Film	52	3.64*	1
5	Polar Photovoltaics	TFSM-T-2	Thin Film	46	3.56*	0
6	Polar Photovoltaics	TFSM-T-4X	Thin Film	50	3.53*	0
7	Polar Photovoltaics	TFSM-T-1	Thin Film	44	3.40*	0
8	Polar Photovoltaics	TFSM-T-3X	Thin Film	48	3.39*	0
9	Polar Photovoltaics	TFSM-T-2X	Thin Film	46	3.27*	0
10	Polar Photovoltaics	TFSM-T-0	Thin Film	42	3.22*	0
11	Polar Photovoltaics	TFSM-T-1X	Thin Film	44	3.13*	0
12	Polar Photovoltaics	TFSM-T-0X	Thin Film	42	2.96*	0

---

* 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.