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 Q-Cells

Here are the PSI Ratings for modules from Q-Cells, 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
1Q-CellsQ.Pro G2 250Polycrystalline2507.52*49
3Q-CellsQ.Base G2 250Polycrystalline2507.45*45
4Q-CellsQ.Pro G2 245Polycrystalline2457.37*39
6Q-CellsQ.Base G2 245Polycrystalline2457.32*37
7Q-CellsQ.Pro G2 240Polycrystalline2407.22*31
8Q-CellsQ.Base G2 240Polycrystalline2407.20*31
10Q-CellsQ.Base G2 235Polycrystalline2357.08*25
12Q-CellsQ.Pro G2 235Polycrystalline2357.06*24
13Q-CellsQ.Base G2 230Polycrystalline2306.96*19
17Q-CellsQ.Smart-95Thin Film956.56*8
18Q-CellsQ.Smart UF-95Thin Film956.56*9
19Q-CellsQ.Smart UFL-115Thin Film1156.36*6
20Q-CellsQ.Smart UF-90Thin Film906.23*4
21Q-CellsQ.Smart-90Thin Film906.23*4
22Q-CellsQ.Smart UFL-110Thin Film1106.03*3
23Q-CellsQ.Smart UFL-105Thin Film1055.78*3
24Q-CellsQ.Smart-85Thin Film855.78*3
25Q-CellsQ.Smart UF-85Thin Film855.78*3
26Q-CellsQ.Smart UFL-100Thin Film1005.50*2
27Q-CellsQ.Smart UF-80Thin Film805.41*2
28Q-CellsQ.Smart-80Thin Film805.41*2
29Q-CellsQ.Smart UFL-95Thin Film955.20*2
30Q-CellsQ.Smart UFL-90Thin Film904.95*2
31Q-CellsQ.Smart UF-70Thin Film704.76*1
32Q-CellsQ.Smart-70Thin Film704.76*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.