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
1	Zhejiang Wanxiang Solar	WXS190P	Polycrystalline	190	8.40*	89
2	Zhejiang Wanxiang Solar	WXS185P	Polycrystalline	185	8.19*	83
3	Zhejiang Wanxiang Solar	WXS185S	Monocrystalline	185	7.98*	74
4	Zhejiang Wanxiang Solar	WXS280P	Polycrystalline	280	7.96*	73
5	Zhejiang Wanxiang Solar	WXS275P	Polycrystalline	275	7.80*	65
6	Zhejiang Wanxiang Solar	WXS180P	Polycrystalline	180	7.79*	65
7	Zhejiang Wanxiang Solar	WXS180S	Monocrystalline	180	7.77*	64
8	Zhejiang Wanxiang Solar	WXS225P	Polycrystalline	225	7.75*	63
9	Zhejiang Wanxiang Solar	WXS175P	Polycrystalline	175	7.74*	62
10	Zhejiang Wanxiang Solar	WXS270P	Polycrystalline	270	7.67*	58
11	Zhejiang Wanxiang Solar	WXS220P	Polycrystalline	220	7.58*	53
12	Zhejiang Wanxiang Solar	WXS175S	Monocrystalline	175	7.55*	51
13	Zhejiang Wanxiang Solar	WXS265P	Polycrystalline	265	7.53*	49
14	Zhejiang Wanxiang Solar	WXS215P	Polycrystalline	215	7.42*	42
15	Zhejiang Wanxiang Solar	WXS260P	Polycrystalline	260	7.39*	41
16	Zhejiang Wanxiang Solar	WXS255P	Polycrystalline	255	7.25*	33
17	Zhejiang Wanxiang Solar	WXS210P	Polycrystalline	210	7.25*	33
18	Zhejiang Wanxiang Solar	WXS250P	Polycrystalline	250	7.10*	26
19	Zhejiang Wanxiang Solar	WXS205P	Polycrystalline	205	7.07*	24
20	Zhejiang Wanxiang Solar	WXS245P	Polycrystalline	245	6.96*	19
21	Zhejiang Wanxiang Solar	WXS200P	Polycrystalline	200	6.89*	17
22	Zhejiang Wanxiang Solar	WXS240P	Polycrystalline	240	6.83*	15
23	Zhejiang Wanxiang Solar	WXS235P	Polycrystalline	235	6.75*	13
24	Zhejiang Wanxiang Solar	WXS230P	Polycrystalline	230	6.60*	9

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* 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.