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 SunPower

Here are the PSI Ratings for modules from SunPower, 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	SunPower	SPR-X21-255	Monocrystalline	255	11.57*	100
2	SunPower	SPR-X22-475-COM	Monocrystalline	475	11.51*	100
3	SunPower	SPR-X22-360	Monocrystalline	360	11.45*	100
4	SunPower	SPR-X22-360-COM	Monocrystalline	360	11.45*	100
5	SunPower	SPR-X22-359	Monocrystalline	359	11.42*	100
6	SunPower	SPR-X22-470-COM	Monocrystalline	470	11.34*	100
7	SunPower	SPR-X21-345-C-AC	Monocrystalline	345	11.23*	100
8	SunPower	SPR-X21-345	Monocrystalline	345	11.23*	100
9	SunPower	SPR-343NJ-WHT-D	Monocrystalline	343	11.19	100
10	SunPower	SPR-343NX-WHT-D	Monocrystalline	343	11.19	100
11	SunPower	SPR-343J-WHT-D	Monocrystalline	343	11.19	100
12	SunPower	SPR-343NX-BLK-D	Monocrystalline	343	11.19	100
13	SunPower	SPR-X22-460-COM	Monocrystalline	470	11.10*	100
14	SunPower	SPR-X22-345-BLK	Monocrystalline	345	11.09*	100
15	SunPower	SPR-X21-345-COM	Monocrystalline	345	11.05*	100
16	SunPower	SPR-X20-255	Monocrystalline	255	10.97*	100
17	SunPower	SPR-445NJ-WHT-D	Monocrystalline	445	10.96	100
18	SunPower	SPR-445J-WHT-D	Monocrystalline	445	10.96	100
19	SunPower	SPR-335NX-BLK-D	Monocrystalline	335	10.93	100
20	SunPower	SPR-X22-340-BLK	Monocrystalline	340	10.92*	100
21	SunPower	SPR-X21-335-C-AC	Monocrystalline	335	10.90*	100
22	SunPower	SPR-X21-335-BLK	Monocrystalline	335	10.90*	100
23	SunPower	SPR-X21-335	Monocrystalline	335	10.90*	100
24	SunPower	SPR-X21-335-BLK-C-AC	Monocrystalline	335	10.90*	100
25	SunPower	SPR-320NE-WHT-D	Monocrystalline	320	10.88	100
26	SunPower	SPR-245NE-WHT-D	Monocrystalline	245	10.85	100
27	SunPower	SPR-X22-335-BLK	Monocrystalline	335	10.76*	100
28	SunPower	SPR-X20-445-COM	Monocrystalline	445	10.76*	100
29	SunPower	SPR-X20-327-BLK	Monocrystalline	327	10.65*	100
30	SunPower	SPR-X20-327-BLK-C-AC	Monocrystalline	327	10.65*	100
31	SunPower	SPR-X20-327	Monocrystalline	327	10.64*	100
32	SunPower	SPR-440NE-WHT-D	Monocrystalline	440	10.64	100
33	SunPower	SPR-X20-327-COM	Monocrystalline	327	10.64*	100
34	SunPower	SPR-X20-327-C-AC	Monocrystalline	327	10.64*	100
35	SunPower	SPR-445NX-WHT-D	Monocrystalline	445	10.57	100
36	SunPower	SPR-X20-245	Monocrystalline	245	10.56*	100
37	SunPower	T5-SPR-327	Monocrystalline	327	10.54	100
38	SunPower	SPR-327NE-WHT-D	Monocrystalline	327	10.52	100
39	SunPower	SPR-415E-WHT-D	Monocrystalline	415	10.50	100
40	SunPower	SPR-X20-250-BLK	Monocrystalline	250	10.49*	100
41	SunPower	SPR-250NX-BLK-D	Monocrystalline	250	10.49*	100
42	SunPower	SPR-X20-250-BLK-LAM	Monocrystalline	250	10.49*	100
43	SunPower	SPR-X20-250-BLK-B-AC	Monocrystalline	250	10.49*	100
44	SunPower	SPR-X20-250-BLK-A-AC	Monocrystalline	250	10.49*	100
45	SunPower	SPR-E20-440-COM	Monocrystalline	440	10.44*	100
46	SunPower	SPR-E20-327-COM-T5	Monocrystalline	327	10.35*	100
47	SunPower	SPR-E20-327	Monocrystalline	327	10.33*	100
48	SunPower	SPR-E20-327-C-AC	Monocrystalline	327	10.33*	100
49	SunPower	SPR-E20-327-COM	Monocrystalline	327	10.33*	100
50	SunPower	SPR-E20-327-COM-LAM	Monocrystalline	327	10.33*	100
51	SunPower	SPR-E20-435-COM	Monocrystalline	435	10.31*	99
52	SunPower	SPR-245NE-WHT-U-ACPV	Monocrystalline	245	10.28	99
53	SunPower	SPR-318E-WHT-D	Monocrystalline	318	10.26	99
54	SunPower	T5-SPR-318E	Monocrystalline	318	10.26	99
55	SunPower	PL-SUNP-SPR-318E	Monocrystalline	318	10.26	99
56	SunPower	SPR-230NE-BLK-D	Monocrystalline	230	10.16	99
57	SunPower	T5-SPR-315	Monocrystalline	315	10.14	99
58	SunPower	SPR-315NE-WHT-D	Monocrystalline	315	10.14	99
59	SunPower	SPR-E19-320-COM	Monocrystalline	320	10.13*	99
60	SunPower	SPR-E19-320	Monocrystalline	320	10.13*	99
61	SunPower	SPR-400E-WHT-D	Monocrystalline	400	10.13	99
62	SunPower	SPR-E19-320-C-AC	Monocrystalline	320	10.13*	99
63	SunPower	SPR-435NE-WHT-D	Monocrystalline	435	10.12	99
64	SunPower	SPR-240E-WHT-D	Monocrystalline	240	10.10	99
65	SunPower	SPR-240E-WHT-U-ACPV	Monocrystalline	240	10.10	99
66	SunPower	SPR-E20-245-A-AC	Monocrystalline	245	10.09*	99
67	SunPower	SPR-E20-245	Monocrystalline	245	10.09*	99
68	SunPower	SPR-E19-245	Monocrystalline	245	10.09*	99
69	SunPower	SPR-E20-245-B-AC	Monocrystalline	245	10.09*	99
70	SunPower	SPR-245NE-WHT-U-240 ACPV	Monocrystalline	245	10.09*	99
71	SunPower	SPR-238E-WHT-D	Monocrystalline	238	10.01	99
72	SunPower	SPR-310E-WHT-U	Monocrystalline	310	9.99	99
73	SunPower	SPR-310E-WHT-D	Monocrystalline	310	9.99	99
74	SunPower	SPR-E19-315	Monocrystalline	315	9.95*	99
75	SunPower	SPR-E19-315-COM	Monocrystalline	315	9.95*	99
76	SunPower	SPR-E19-410-COM	Monocrystalline	410	9.95*	99
77	SunPower	T5-SPR-320E	Monocrystalline	320	9.94	99
78	SunPower	SPR-320E-WHT-D	Monocrystalline	320	9.94	99
79	SunPower	PL-SUNP-SPR-308E	Monocrystalline	308	9.93	99
80	SunPower	SPR-225NE-BLK-D	Monocrystalline	225	9.93	99
81	SunPower	SPR-308E-WHT-D	Monocrystalline	308	9.93	99
82	SunPower	SPR-308NE-WHT-D	Monocrystalline	308	9.93	99
83	SunPower	T5-SPR-308E	Monocrystalline	308	9.93	99
84	SunPower	SPR-E19-240	Monocrystalline	240	9.91*	99
85	SunPower	SPR-425E-WHT-D	Monocrystalline	425	9.89	99
86	SunPower	SPR-390E-WHT-D	Monocrystalline	390	9.88	99
87	SunPower	SPR-235NE-WHT-D	Monocrystalline	235	9.84	99
88	SunPower	SPR-305NE-WHT-D	Monocrystalline	305	9.83	99
89	SunPower	SPR-E19-310-COM	Monocrystalline	310	9.81*	99
90	SunPower	SPR-315E-WHT-U	Monocrystalline	315	9.77	99
91	SunPower	T5-SPR-315E	Monocrystalline	315	9.77	99
92	SunPower	SPR-315E-WHT-D	Monocrystalline	315	9.77	99
93	SunPower	SPR-410NE-WHT-D	Monocrystalline	410	9.77	99
94	SunPower	PL-SUNP-SPR-315E	Monocrystalline	315	9.77	99
95	SunPower	SPR-300E-WHT-D	Monocrystalline	300	9.66	98
96	SunPower	SPR-E18-235	Monocrystalline	235	9.66*	98
97	SunPower	SPR-300NE-WHT-D	Monocrystalline	300	9.66	98
98	SunPower	SPR-E19-235	Monocrystalline	235	9.66*	98
99	SunPower	SPR-E18-305-COM	Monocrystalline	305	9.65*	98
100	SunPower	T5-SPR-310	Monocrystalline	310	9.63	98
101	SunPower	SPR-310-WHT-U	Monocrystalline	310	9.63	98
102	SunPower	PL-SUNP-SPR-310	Monocrystalline	310	9.63	98
103	SunPower	SPR-230NE-BLK-U-ACPV	Monocrystalline	230	9.63	98
104	SunPower	SPR-230-WHT-U	Monocrystalline	230	9.63	98
105	SunPower	SPR-225E-BLK-U-ACPV	Monocrystalline	225	9.57	98
106	SunPower	SPR-225E-BLK-D	Monocrystalline	225	9.57	98
107	SunPower	SPR-295E-WHT-U	Monocrystalline	295	9.52	98
108	SunPower	SPR-295E-WHT-D	Monocrystalline	295	9.52	98
109	SunPower	SPR-E18-300-COM	Monocrystalline	300	9.49*	98
110	SunPower	T5-SPR-305E	Monocrystalline	305	9.47	98
111	SunPower	SPR-305-WHT-U	Monocrystalline	305	9.47	98
112	SunPower	T5-SPR-305	Monocrystalline	305	9.47	98
113	SunPower	SPR-305E-WHT-D	Monocrystalline	305	9.47	98
114	SunPower	SPR-305E-WHT-U	Monocrystalline	305	9.47	98
115	SunPower	PL-SUNP-SPR-305	Monocrystalline	305	9.47	98
116	SunPower	SPR-225E-WHT-D	Monocrystalline	225	9.44	98
117	SunPower	SPR-E18-295-COM	Monocrystalline	295	9.35*	98
118	SunPower	SPR-230E-WHT-D	Monocrystalline	230	9.32	98
119	SunPower	SPR-225-BLK-U	Monocrystalline	225	9.23	97
120	SunPower	SPR-290-WHT-U	Monocrystalline	290	9.02	96
121	SunPower	T5-SPR-290	Monocrystalline	290	9.02	97
122	SunPower	PL-SUNP-SPR-290	Monocrystalline	290	9.02	96
123	SunPower	PL-SUNP-SPR-215	Monocrystalline	215	8.89	96
124	SunPower	SPR-215-WHT-U	Monocrystalline	215	8.89	96
125	SunPower	SPR-220-BLK-U	Monocrystalline	220	8.77	95
126	SunPower	SPR-217-WHT-U	Monocrystalline	217	8.75	94
127	SunPower	SPR-210-WHT-U	Monocrystalline	210	8.69	94
128	SunPower	PL-PLT-63L-BLK-U	Monocrystalline	63	8.68	94
129	SunPower	SPR-210-BLK-U	Monocrystalline	210	8.58	92
130	SunPower	SPR-208-WHT-U	Monocrystalline	208	8.39	89
131	SunPower	SPR-220-WHT-U	Monocrystalline	220	8.37	88
132	SunPower	SPR-205-BLK-U	Monocrystalline	205	8.18	83
133	SunPower	SPR-200-WHT-U	Monocrystalline	200	8.05	78
134	SunPower	SPR-200-BLK-U	Monocrystalline	200	7.97	74
135	SunPower	SPR-X19-240-BLK	Monocrystalline	240	7.92*	71
136	SunPower	SPR-X19-240-BLK-B-AC	Monocrystalline	240	7.92*	71
137	SunPower	T5-SER-235P	Polycrystalline	235	7.47	46
138	SunPower	SER-235P	Polycrystalline	235	7.19	30
139	SunPower	SER-228P	Polycrystalline	228	7.17	29
140	SunPower	SER-220P	Polycrystalline	220	6.75*	13
141	SunPower	SPR-76R-BLK-U	Monocrystalline	76	6.67	11
142	SunPower	SPR-76RE-BLK-U	Monocrystalline	76	6.67	11

* 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.