Principal Solar Institute

A community for development and installation professionals in the solar industry

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 ENN Solar Energy

Here are the PSI Ratings for modules from ENN Solar Energy, 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
1ENN Solar EnergyEST-120Thin Film1204.56*1
2ENN Solar EnergyEST-240VThin Film2404.53*1
3ENN Solar EnergyEST-240HThin Film2404.53*1
4ENN Solar EnergyEST-480Thin Film4804.51*1
5ENN Solar EnergyEST-228HAThin Film2294.41*1
6ENN Solar EnergyEST-460AThin Film4584.39*1
7ENN Solar EnergyEST-460Thin Film4584.39*1
8ENN Solar EnergyEST-115Thin Film1154.36*1
9ENN Solar EnergyEST-230HThin Film2304.34*1
10ENN Solar EnergyEST-230VThin Film2304.33*1
11ENN Solar EnergyEST-115AThin Film1144.32*1
12ENN Solar EnergyEST-228VAThin Film2294.31*1
13ENN Solar EnergyEST-220HThin Film2204.16*1
14ENN Solar EnergyEST-220VThin Film2204.15*1
15ENN Solar EnergyEST-440Thin Film4404.14*1
16ENN Solar EnergyEST-110Thin Film1104.11*1

* 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.