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.

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 TDG Holding

Here are the PSI Ratings for modules from TDG Holding, 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
1TDG HoldingT305M726Monocrystalline3056.80*14
2TDG HoldingT255M606Monocrystalline2556.76*13
3TDG HoldingT200M725Monocrystalline2006.73*12
4TDG HoldingT300M726Monocrystalline3006.69*11
5TDG HoldingT250P606Polycrystalline2506.65*10
6TDG HoldingT260M965Monocrystalline2606.64*10
7TDG HoldingT250M606Monocrystalline2506.63*10
8TDG HoldingT295P726Polycrystalline2956.61*9
9TDG HoldingT295M726Monocrystalline2956.58*9
10TDG HoldingT195M725Monocrystalline1956.55*8
11TDG HoldingT245P606Polycrystalline2456.51*8
12TDG HoldingT290P726Polycrystalline2906.50*7
13TDG HoldingT255M965Monocrystalline2556.50*7
14TDG HoldingT245M606Monocrystalline2456.48*7
15TDG HoldingT290M726Monocrystalline2906.47*7
16TDG HoldingT190M725Monocrystalline1906.39*6
17TDG HoldingT285P726Polycrystalline2856.39*6
18TDG HoldingT240P606Polycrystalline2406.38*6
19TDG HoldingT250M965Monocrystalline2506.38*6
20TDG HoldingT240M606Monocrystalline2406.35*6
21TDG HoldingT285M726Monocrystalline2856.35*6
22TDG HoldingT280P726Polycrystalline2806.28*5
23TDG HoldingT280M726Monocrystalline2806.26*5
24TDG HoldingT245M965Monocrystalline2456.26*5
25TDG HoldingT235P606Polycrystalline2356.24*5
26TDG HoldingT235M606Monocrystalline2356.22*4
27TDG HoldingT185M725Monocrystalline1856.22*4
28TDG HoldingT275P726Polycrystalline2756.17*4
29TDG HoldingT275M726Monocrystalline2756.16*4
30TDG HoldingT240M965Monocrystalline2406.13*4
31TDG HoldingT230P606Polycrystalline2306.12*4
32TDG HoldingT230M606Monocrystalline2306.06*3
33TDG HoldingT270M726Monocrystalline2706.05*3
34TDG HoldingT270P726Polycrystalline2706.04*3
35TDG HoldingT180M725Monocrystalline1806.04*3
36TDG HoldingT225P606Polycrystalline2255.98*3
37TDG HoldingT235M965Monocrystalline2355.98*3
38TDG HoldingT225M606Monocrystalline2255.97*3
39TDG HoldingT265M726Monocrystalline2655.94*3
40TDG HoldingT265P726Polycrystalline2655.92*3
41TDG HoldingT175M725Monocrystalline1755.88*3
42TDG HoldingT230M965Monocrystalline2305.87*3
43TDG HoldingT220P606Polycrystalline2205.85*3
44TDG HoldingT260P726Polycrystalline2605.82*3
45TDG HoldingT260M726Monocrystalline2605.82*3
46TDG HoldingT220M606Monocrystalline2205.80*3
47TDG HoldingT225M965Monocrystalline2255.74*2
48TDG HoldingT215P606Polycrystalline2155.72*2
49TDG HoldingT255P726Polycrystalline2555.71*2
50TDG HoldingT170M725Monocrystalline1705.71*2
51TDG HoldingT255M726Monocrystalline2555.71*2
52TDG HoldingT220M965Monocrystalline2205.61*2
53TDG HoldingT210P606Polycrystalline2105.59*2
54TDG HoldingT250P726Polycrystalline2505.59*2

* 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.