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 Zhejiang Wanxiang Solar

Here are the PSI Ratings for modules from Zhejiang Wanxiang 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
1Zhejiang Wanxiang SolarWXS190PPolycrystalline1908.40*89
2Zhejiang Wanxiang SolarWXS185PPolycrystalline1858.19*83
3Zhejiang Wanxiang SolarWXS185SMonocrystalline1857.98*74
4Zhejiang Wanxiang SolarWXS280PPolycrystalline2807.96*73
5Zhejiang Wanxiang SolarWXS275PPolycrystalline2757.80*65
6Zhejiang Wanxiang SolarWXS180PPolycrystalline1807.79*65
7Zhejiang Wanxiang SolarWXS180SMonocrystalline1807.77*64
8Zhejiang Wanxiang SolarWXS225PPolycrystalline2257.75*63
9Zhejiang Wanxiang SolarWXS175PPolycrystalline1757.74*62
10Zhejiang Wanxiang SolarWXS270PPolycrystalline2707.67*58
11Zhejiang Wanxiang SolarWXS220PPolycrystalline2207.58*53
12Zhejiang Wanxiang SolarWXS175SMonocrystalline1757.55*51
13Zhejiang Wanxiang SolarWXS265PPolycrystalline2657.53*49
14Zhejiang Wanxiang SolarWXS215PPolycrystalline2157.42*42
15Zhejiang Wanxiang SolarWXS260PPolycrystalline2607.39*41
16Zhejiang Wanxiang SolarWXS255PPolycrystalline2557.25*33
17Zhejiang Wanxiang SolarWXS210PPolycrystalline2107.25*33
18Zhejiang Wanxiang SolarWXS250PPolycrystalline2507.10*26
19Zhejiang Wanxiang SolarWXS205PPolycrystalline2057.07*24
20Zhejiang Wanxiang SolarWXS245PPolycrystalline2456.96*19
21Zhejiang Wanxiang SolarWXS200PPolycrystalline2006.89*17
22Zhejiang Wanxiang SolarWXS240PPolycrystalline2406.83*15
23Zhejiang Wanxiang SolarWXS235PPolycrystalline2356.75*13
24Zhejiang Wanxiang SolarWXS230PPolycrystalline2306.60*9

* 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.