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 UE Solar

Here are the PSI Ratings for modules from UE Solar, 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
1UE SolarZHM-60-260PPolycrystalline2608.11*80
2UE SolarZHM280PPolycrystalline2807.96*73
3UE SolarZHM-60-255PPolycrystalline2557.95*73
4UE SolarZHM275PPolycrystalline2757.80*65
5UE SolarZHM-60-250PPolycrystalline2507.79*65
6UE SolarZHM-60-245PPolycrystalline2457.68*58
7UE SolarZHM270PPolycrystalline2707.67*58
8UE SolarZHM265PPolycrystalline2657.53*49
9UE SolarZHM-60-240PPolycrystalline2407.53*49
10UE SolarZHM260PPolycrystalline2607.39*41
11UE SolarZHM-60-235PPolycrystalline2357.37*39
12UE SolarZHM185Monocrystalline1857.31*36
13UE SolarZHM255PPolycrystalline2557.25*33
14UE SolarZHM-60-230PPolycrystalline2307.21*31
15UE SolarZHM230PPolycrystalline2307.15*28
16UE SolarZHM180Monocrystalline1807.11*26
17UE SolarZHM250PPolycrystalline2507.10*26
18UE SolarZHM225PPolycrystalline2256.97*20
19UE SolarZHM245PPolycrystalline2456.96*19
20UE SolarZHM175Monocrystalline1756.91*18
21UE SolarZHM240PPolycrystalline2406.83*15
22UE SolarZHM220PPolycrystalline2206.82*15
23UE SolarZHM235PPolycrystalline2356.75*13

* 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.