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 Andalay Solar

Here are the PSI Ratings for modules from Andalay 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	Andalay Solar	TW-250-1-DC4-0-B	Polycrystalline	250	9.71*	99
2	Andalay Solar	TW-250-1-AC2-D-B	Polycrystalline	250	9.71*	99
3	Andalay Solar	TW-245-1-DC4-0-B	Polycrystalline	245	9.50*	98
4	Andalay Solar	TW-245-1-AC2-D-B	Polycrystalline	245	9.50*	98
5	Andalay Solar	TW-240-1-DC4-0-B	Polycrystalline	240	9.29*	98
6	Andalay Solar	TW-240-1-AC2-D-B	Polycrystalline	240	9.29*	98
7	Andalay Solar	AX-260-1-DC4-0-B	Polycrystalline	260	8.13*	81
8	Andalay Solar	AX-255-1-DC4-0-B	Polycrystalline	255	7.95*	73
9	Andalay Solar	ST-195-1AC1-A-B	Monocrystalline	195	7.85*	68
10	Andalay Solar	ST_195_1_DC0_0_B	Monocrystalline	195	7.85*	68
11	Andalay Solar	ST-195-1AC3-B-B	Monocrystalline	195	7.85*	68
12	Andalay Solar	AX-250-1-DC4-0-B	Polycrystalline	250	7.81*	66
13	Andalay Solar	ST_290_1_DC0_0_B	Polycrystalline	290	7.68*	59
14	Andalay Solar	ST_190_1_DC0_0_B	Monocrystalline	190	7.65*	57
15	Andalay Solar	ST-190-1AC1-A-B	Monocrystalline	190	7.65*	57
16	Andalay Solar	ST-190-1AC3-B-B	Monocrystalline	190	7.65*	57
17	Andalay Solar	LW-240-1-AC3-B-B	Polycrystalline	240	7.49*	47
18	Andalay Solar	LW-240-1-DC1-0-B	Polycrystalline	240	7.49*	47
19	Andalay Solar	LW-240-1-AC2-D-B	Polycrystalline	240	7.49*	47
20	Andalay Solar	LW-240-1-DC0-0-B	Polycrystalline	240	7.49*	47
21	Andalay Solar	LW-240-1-DC0-0-BL	Polycrystalline	240	7.49*	47
22	Andalay Solar	LW-240-1-AC1-A-B	Polycrystalline	240	7.49*	47
23	Andalay Solar	LW-240-1-AC0-D-B	Polycrystalline	240	7.49*	47
24	Andalay Solar	ST_185_1_DC0_0_B	Monocrystalline	185	7.45*	45
25	Andalay Solar	ST-185-1AC1-A-B	Monocrystalline	185	7.45*	45
26	Andalay Solar	ST-185-1AC3-B-A	Monocrystalline	185	7.45*	45
27	Andalay Solar	ST-185-1	Monocrystalline	185	7.45*	45
28	Andalay Solar	ST-185-1AC3-B-B	Monocrystalline	185	7.45*	45
29	Andalay Solar	ST-185-1AC1-A-A	Monocrystalline	185	7.45*	45
30	Andalay Solar	ST_280_1_DC0_0_B	Polycrystalline	280	7.41*	42
31	Andalay Solar	LW-235-1-AC3-B-B	Polycrystalline	235	7.39*	41
32	Andalay Solar	LW-235-1-DC1-0-B	Polycrystalline	235	7.39*	41
33	Andalay Solar	LW-235-1-AC2-D-B	Polycrystalline	235	7.39*	41
34	Andalay Solar	LW-235-1-DC0-0-BL	Polycrystalline	235	7.39*	41
35	Andalay Solar	LW-235-1-AC0-D-B	Polycrystalline	235	7.39*	41
36	Andalay Solar	LW-235-1-DC0-0-B	Polycrystalline	235	7.39*	41
37	Andalay Solar	LW-235-1-AC1-A-B	Polycrystalline	235	7.39*	41
38	Andalay Solar	ST180-1	Monocrystalline	180	7.22*	31
39	Andalay Solar	ST_180_1_DC0_0_B	Monocrystalline	180	7.22*	31
40	Andalay Solar	ST_270_1_DC0_0_B	Polycrystalline	270	7.21*	31
41	Andalay Solar	LW-230-1-AC3-B-B	Polycrystalline	230	7.17*	29
42	Andalay Solar	LW-230-1-DC0-0-B	Polycrystalline	230	7.17*	29
43	Andalay Solar	LW-230-1-AC2-D-B	Polycrystalline	230	7.17*	29
44	Andalay Solar	LW-230-1-DC0-0-BL	Polycrystalline	230	7.17*	29
45	Andalay Solar	LW-230-1-DC1-0-B	Polycrystalline	230	7.17*	29
46	Andalay Solar	LW-230-1-AC0-D-B	Polycrystalline	230	7.17*	29
47	Andalay Solar	LW-230-1-AC1-A-B	Polycrystalline	230	7.17*	29
48	Andalay Solar	KC210-1	Polycrystalline	210	7.13*	27
49	Andalay Solar	ST175-1	Monocrystalline	175	6.99*	21
50	Andalay Solar	ST_175_1_DC0_0_B	Monocrystalline	175	6.99*	21
51	Andalay Solar	ST-175-1AC1-A-A	Monocrystalline	175	6.99*	21
52	Andalay Solar	ST-175-1AC3-B-A	Monocrystalline	175	6.99*	21
53	Andalay Solar	KC205-1	Polycrystalline	205	6.95*	19
54	Andalay Solar	ST_260_1_DC0_0_B	Polycrystalline	260	6.94*	19
55	Andalay Solar	KC180-1	Polycrystalline	180	6.90*	17
56	Andalay Solar	ST170-1	Monocrystalline	170	6.82*	15
57	Andalay Solar	ST_170_1_DC0_0_B	Monocrystalline	170	6.82*	15
58	Andalay Solar	ST_165_1_DC0_0_B	Monocrystalline	165	6.19*	4
59	Andalay Solar	ST165-1	Monocrystalline	165	6.19*	4

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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.