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 Grape Solar

Here are the PSI Ratings for modules from Grape 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
1Grape SolarGS-S72-335-SIMonocrystalline3358.79*95
2Grape SolarGS-S60-280-SIMonocrystalline2808.71*94
3Grape SolarGS-P72-330-Fab2Polycrystalline3308.69*94
4Grape SolarGS-S72-330-SIMonocrystalline3308.66*93
5Grape SolarGS-P60-275-Fab2Polycrystalline2758.59*92
6Grape SolarGS-P72-325-Fab2Polycrystalline3258.57*92
7Grape SolarGS-S60-275-SIMonocrystalline2758.55*92
8Grape SolarGS-S72-325-SIMonocrystalline3258.53*91
9Grape SolarGS-P-270-Fab1Polycrystalline2708.48*91
10Grape SolarGS-P60-270-Fab2Polycrystalline2708.44*90
11Grape SolarGS-P72-320-Fab2Polycrystalline3208.43*90
12Grape SolarGS-S72-320-SIMonocrystalline3208.40*89
13Grape SolarGS-S60-270-SIMonocrystalline2708.39*89
14Grape SolarGS-P-265-Fab1Polycrystalline2658.32*87
15Grape SolarGS-P72-315-Fab2Polycrystalline3158.30*87
16Grape SolarGS-S-420-KR1Monocrystalline4208.29*86
17Grape SolarGS-P60-265-Fab2Polycrystalline2658.28*86
18Grape SolarGS-S72-315-SIMonocrystalline3158.27*86
19Grape SolarGS-S-260-KR1KMonocrystalline2608.25*85
20Grape SolarGS-S-260-KR1Monocrystalline2608.25*85
21Grape SolarGS-S60-265-SIMonocrystalline2658.24*85
22Grape SolarGS-S-310-FAB36Monocrystalline3108.24*85
23Grape SolarGS-S-415-KR1Monocrystalline4158.19*83
24Grape SolarGS-P-295-Fab1Polycrystalline2958.18*83
25Grape SolarGS-S-295-Fab1Monocrystalline2958.18*83
26Grape SolarGS-P72-310-Fab2Polycrystalline3108.17*82
27Grape SolarGS-S-310-KR1KMonocrystalline3108.17*82
28Grape SolarGS-S-310-KR1Monocrystalline3108.17*82
29Grape SolarGS-P-260-Fab1Polycrystalline2608.16*82
30Grape SolarGS-S72-310-SIMonocrystalline3108.14*81
31Grape SolarGS-S-305-FAB36Monocrystalline3058.12*80
32Grape SolarGS-P60-260-Fab2Polycrystalline2608.12*80
33Grape SolarGS-S60-260-SIMonocrystalline2608.09*79
34Grape SolarGS-S-255-KR1KMonocrystalline2558.09*79
35Grape SolarGS-S-255-KR1Monocrystalline2558.09*79
36Grape SolarGS-S-410-KR1Monocrystalline4108.09*79
37Grape SolarGS-S-260-KR3Monocrystalline2608.06*78
38Grape SolarGS-S-260-KR3KMonocrystalline2608.06*78
39Grape SolarGS-S-290-Fab1Monocrystalline2908.05*78
40Grape SolarGS-S-305-KR1KMonocrystalline3058.04*77
41Grape SolarGS-S-305-KR1Monocrystalline3058.04*77
42Grape SolarGS-S-420-KR3Monocrystalline4208.04*77
43Grape SolarGS-P72-305-Fab2Polycrystalline3058.04*77
44Grape SolarGS-P-290-Fab1Polycrystalline2908.03*77
45Grape SolarGS-S72-305-SIMonocrystalline3058.01*76
46Grape SolarGS-P-255-Fab1Polycrystalline2558.01*76
47Grape SolarGS-S-405-KR1Monocrystalline4057.99*75
48Grape SolarGS-P-300-FAB36Polycrystalline3007.99*75
49Grape SolarGS-S-300-FAB36Monocrystalline3007.98*75
50Grape SolarGS-P60-255-Fab2Polycrystalline2557.97*74
51Grape SolarGS-S-415-KR3Monocrystalline4157.94*73
52Grape SolarGS-S-250-KR1Monocrystalline2507.93*72
53Grape SolarGS-S-250-KR1KMonocrystalline2507.93*72
54Grape SolarGS-S-285-Fab1Monocrystalline2857.92*71
55Grape SolarGS-S-410-PlatinumMonocrystalline4107.92*71
56Grape SolarGS-P72-300-Fab2Polycrystalline3007.91*71
57Grape SolarGS-S-300-KR1KMonocrystalline3007.91*71
58Grape SolarGS-S-300-KR1Monocrystalline3007.91*71
59Grape SolarGS-P-285-Fab1Polycrystalline2857.90*70
60Grape SolarGS-S-255-KR3KMonocrystalline2557.90*71
61Grape SolarGS-S-255-KR3Monocrystalline2557.90*71
62Grape SolarGS-P-250-Fab1Polycrystalline2507.85*68
63Grape SolarGS-S-410-KR3Monocrystalline4107.85*68
64Grape SolarGS-P-295-FAB36Polycrystalline2957.85*68
65Grape SolarGS-S-295-FAB36Monocrystalline2957.84*68
66Grape SolarGS-S-405-PlatinumMonocrystalline4057.83*67
67Grape SolarGS-P72-295-Fab2Polycrystalline2957.83*67
68Grape SolarGS-P-395-KR2Polycrystalline3957.83*67
69Grape SolarGS-S-280-Fab1Monocrystalline2807.78*64
70Grape SolarGS-P-280-Fab1Polycrystalline2807.76*63
71Grape SolarGS-S-405-KR3Monocrystalline4057.75*63
72Grape SolarGS-S-250-KR3Monocrystalline2507.75*63
73Grape SolarGS-S-250-KR3KMonocrystalline2507.75*63
74Grape SolarGS-P-250-KR2KPolycrystalline2507.74*62
75Grape SolarGS-P-250-KR2Polycrystalline2507.74*62
76Grape SolarGS-P-390-KR2Polycrystalline3907.74*62
77Grape SolarGS-S-400-PlatinumMonocrystalline4007.73*62
78Grape SolarGS-P72-290-Fab2Polycrystalline2907.73*61
79Grape SolarGS-S-290-FAB36Monocrystalline2907.72*61
80Grape SolarGS-P-290-FAB36Polycrystalline2907.72*61
81Grape SolarGS-S-275-Fab1Monocrystalline2757.69*59
82Grape SolarGS-P-245-Fab1Polycrystalline2457.66*57
83Grape SolarGS-P-385-KR2Polycrystalline3857.63*56
84Grape SolarGS-S-395-PlatinumMonocrystalline3957.62*55
85Grape SolarGS-P-275-Fab1Polycrystalline2757.61*54
86Grape SolarCS-P-280-DJPolycrystalline2807.61*55
87Grape SolarGS-P-245-KR2KPolycrystalline2457.58*53
88Grape SolarGS-P-245-KR2Polycrystalline2457.58*53
89Grape SolarGS-P72-285-Fab2Polycrystalline2857.58*53
90Grape SolarGS-P-285-FAB36Polycrystalline2857.58*53
91Grape SolarGS-S-270-Fab1Monocrystalline2707.55*51
92Grape SolarGS-P-380-KR2Polycrystalline3807.53*50
93Grape SolarGS-P-240-Fab1Polycrystalline2407.50*48
94Grape SolarGS-P-375-KR2Polycrystalline3757.44*44
95Grape SolarCS-P-230-DJPolycrystalline2307.44*44
96Grape SolarGS-P72-280-Fab2Polycrystalline2807.43*43
97Grape SolarGS-P-240-KR2Polycrystalline2407.43*43
98Grape SolarGS-P-240-KR2KPolycrystalline2407.43*43
99Grape SolarGS-P-280-EUGPolycrystalline2807.42*42
100Grape SolarGS-P-230-CSPolycrystalline2307.42*43
101Grape SolarGS-P-285-PDXPolycrystalline2857.41*42
102Grape SolarGS-S-265-Fab1Monocrystalline2657.41*42
103Grape SolarGS-S-385-TSMonocrystalline3857.40*41
104Grape SolarCS-P-270-DJPolycrystalline2707.40*41
105Grape SolarGS-P-235-Fab5Polycrystalline2357.37*39
106Grape SolarGS-P-235-Fab1Polycrystalline2357.34*38
107Grape SolarGS-S-250-Fab8Monocrystalline2507.32*37
108Grape SolarGS-P-230-SL6-20Polycrystalline2307.30*36
109Grape SolarGS-P-235-PDXPolycrystalline2357.29*35
110Grape SolarGS-S-185-Fab8Monocrystalline1857.29*35
111Grape SolarGS-S-185-SFMonocrystalline1857.29*35
112Grape SolarGS-P72-275-Fab2Polycrystalline2757.29*35
113Grape SolarGS-P-275-EUGPolycrystalline2757.28*35
114Grape SolarGS-P-280-PDXPolycrystalline2807.28*35
115Grape SolarGS-S-260-Fab1Monocrystalline2607.26*34
116Grape SolarGS-S-240-CSMonocrystalline2407.23*32
117Grape SolarGS-P-230-Fab5Polycrystalline2307.21*31
118Grape SolarGS-S-180-EUGMonocrystalline1807.20*30
119Grape SolarGS-S-280-Fab5Monocrystalline2807.19*30
120Grape SolarGS-P-230-EUGPolycrystalline2307.19*30
121Grape SolarGS-P-230-Fab1Polycrystalline2307.19*30
122Grape SolarGS-P-205-EUGPolycrystalline2057.17*29
123Grape SolarGS-S-245-Fab8Monocrystalline2457.17*29
124Grape SolarCS-S-180-DJMonocrystalline1807.17*28
125Grape SolarGS-S-390-TSMonocrystalline3907.17*29
126Grape SolarGS-P72-270-Fab2Polycrystalline2707.16*28
127Grape SolarGS-P-270-EUGPolycrystalline2707.15*28
128Grape SolarGS-P-230-PDXPolycrystalline2307.14*27
129Grape SolarGS-P-275-PDXPolycrystalline2757.14*27
130Grape SolarGS-P-220-CSPolycrystalline2207.12*27
131Grape SolarGS-P-205-SL6-18Polycrystalline2057.09*25
132Grape SolarGS-P-140-PDXPolycrystalline1407.07*24
133Grape SolarGS-S-275-Fab5Monocrystalline2757.07*24
134Grape SolarGS-S-180-SFMonocrystalline1807.07*24
135Grape SolarGS-P-225-Fab5Polycrystalline2257.06*24
136Grape SolarGS-P-180-EUGPolycrystalline1807.05*23
137Grape SolarGS-P-225-EUGPolycrystalline2257.03*22
138Grape SolarGS-P-225-Fab1Polycrystalline2257.03*22
139Grape SolarGS-P-270-PDXPolycrystalline2707.02*22
140Grape SolarGS-S-240-Fab8Monocrystalline2407.02*22
141Grape SolarGS-P72-265-Fab2Polycrystalline2657.02*22
142Grape SolarGS-S-180-Fab8Monocrystalline1806.99*21
143Grape SolarGS-P-200-EUGPolycrystalline2006.99*21
144Grape SolarGS-S-175-EUGMonocrystalline1756.99*21
145Grape SolarGS-P-225-PDXPolycrystalline2256.98*20
146Grape SolarCS-S-175-DJMonocrystalline1756.97*20
147Grape SolarGS-P-220-ORPolycrystalline2206.97*20
148Grape SolarGS-P-225-SL6-20Polycrystalline2256.95*19
149Grape SolarGS-P-200-SL6-18Polycrystalline2006.91*18
150Grape SolarGS-S-270-Fab5Monocrystalline2706.90*17
151Grape SolarGS-P72-260-Fab2Polycrystalline2606.90*17
152Grape SolarGS-P-220-Fab5Polycrystalline2206.88*17
153Grape SolarGS-P-265-PDXPolycrystalline2656.88*17
154Grape SolarGS-P-220-EUGPolycrystalline2206.87*16
155Grape SolarGS-S-175-SFMonocrystalline1756.87*17
156Grape SolarGS-P-175-EUGPolycrystalline1756.86*16
157Grape SolarGS-P-260-EUGPolycrystalline2606.86*16
158Grape SolarCS-P-260-DJPolycrystalline2606.83*15
159Grape SolarGS-S-235-Fab8Monocrystalline2356.83*15
160Grape SolarGS-P-135-PDXPolycrystalline1356.83*15
161Grape SolarGS-P-215-ORPolycrystalline2156.82*15
162Grape SolarGS-S-230-CSMonocrystalline2306.82*15
163Grape SolarGS-P-195-EUGPolycrystalline1956.82*15
164Grape SolarCS-P-220-DJPolycrystalline2206.81*15
165Grape SolarGS-P-220-PDXPolycrystalline2206.81*15
166Grape SolarGS-P-220-SL6-20Polycrystalline2206.80*14
167Grape SolarGS-S-255-Fab3Monocrystalline2556.79*14
168Grape SolarGS-S-265-Fab5Monocrystalline2656.77*13
169Grape SolarGS-P-260-PDXPolycrystalline2606.76*13
170Grape SolarGS-P-190-SL6-18Polycrystalline1956.74*12
171Grape SolarGS-P-255-EUGPolycrystalline2556.73*12
172Grape SolarGS-P-215-Fab5Polycrystalline2156.72*12
173Grape SolarGS-S-170-SFMonocrystalline1706.71*12
174Grape SolarGS-S-250-Fab3Monocrystalline2506.68*11
175Grape SolarGS-S-230-Fab8Monocrystalline2306.68*11
176Grape SolarGS-P-170-EUGPolycrystalline1706.67*11
177Grape SolarGS-P-190-EUGPolycrystalline1906.65*10
178Grape SolarGS-P-215-PDXPolycrystalline2156.65*10
179Grape SolarGS-P-210-ORPolycrystalline2106.65*11
180Grape SolarGS-S-260-Fab5Monocrystalline2606.64*10
181Grape SolarGS-P-255-PDXPolycrystalline2556.63*10
182Grape SolarCS-S-170-DJMonocrystalline1706.63*10
183Grape SolarGS-S-175-Fab8Monocrystalline1706.62*10
184Grape SolarCS-P-250-DJPolycrystalline2506.62*10
185Grape SolarGS-P-250-EUGPolycrystalline2506.60*9
186Grape SolarGS-P-130-PDXPolycrystalline1306.56*9
187Grape SolarGS-P-210-Fab5Polycrystalline2106.56*9
188Grape SolarGS-S-220-CSMonocrystalline2206.54*8
189Grape SolarGS-S-225-Fab8Monocrystalline2256.54*8
190Grape SolarGS-S-245-Fab3Monocrystalline2456.53*8
191Grape SolarCS-S-165-DJMonocrystalline1656.53*8
192Grape SolarGS-S-165-SFMonocrystalline1656.53*8
193Grape SolarGS-S-255-Fab5Monocrystalline2556.51*8
194Grape SolarGS-P-210-PDXPolycrystalline2106.50*7
195Grape SolarCS-P-240-DJPolycrystalline2406.50*8
196Grape SolarCS-P-210-DJPolycrystalline2106.50*8
197Grape SolarGS-P-250-PDXPolycrystalline2506.49*7
198Grape SolarGS-P-205-ORPolycrystalline2056.49*7
199Grape SolarGS-S-240-Fab1Monocrystalline2406.47*7
200Grape SolarGS-S-165-Fab8Monocrystalline1656.44*7
201Grape SolarGS-S-240-Fab3Monocrystalline2406.40*6
202Grape SolarGS-P-165-EUGPolycrystalline1656.40*6
203Grape SolarGS-S-220-Fab8Monocrystalline2206.39*6
204Grape SolarGS-S-250-Fab5Monocrystalline2506.38*6
205Grape SolarGS-P-245-PDXPolycrystalline2456.36*6
206Grape SolarGS-P-200-ORPolycrystalline2006.34*5
207Grape SolarGS-P-205-PDXPolycrystalline2056.34*6
208Grape SolarGS-S-235-Fab1Monocrystalline2356.34*6
209Grape SolarGS-P-125-PDXPolycrystalline1256.31*5
210Grape SolarGS-S-235-Fab3Monocrystalline2356.26*5
211Grape SolarGS-P-240-PDXPolycrystalline2406.24*5
212Grape SolarGS-S-160-SFMonocrystalline1606.23*4
213Grape SolarGS-S-160-Fab8Monocrystalline1606.23*4
214Grape SolarGS-P-160-EUGPolycrystalline1606.21*4
215Grape SolarGS-S-230-Fab1Monocrystalline2306.21*4
216Grape SolarCS-P-200-DJPolycrystalline2006.19*4
217Grape SolarGS-P-200-PDXPolycrystalline2006.19*4
218Grape SolarGS-S-230-Fab3Monocrystalline2306.12*4
219Grape SolarGS-P-200-CSPEPolycrystalline2006.11*4
220Grape SolarGS-S-225-Fab1Monocrystalline2256.07*3
221Grape SolarGS-P-120-PDXPolycrystalline1206.06*3
222Grape SolarGS-S-155-SFMonocrystalline1556.04*3
223Grape SolarGS-S-225-Fab3Monocrystalline2255.98*3
224Grape SolarGS-S-220-Fab1Monocrystalline2205.92*3
225Grape SolarGS-P-220-Fab1Polycrystalline2205.90*3
226Grape SolarGS-S-150-SFMonocrystalline1505.87*3
227Grape SolarGS-S-220-Fab3Monocrystalline2205.86*3
228Grape SolarGS-S-215-Fab1Monocrystalline2155.78*3
229Grape SolarGS-P-215-Fab1Polycrystalline2155.77*3
230Grape SolarGS-S-210-Fab1Monocrystalline2105.65*2
231Grape SolarGS-P-210-Fab1Polycrystalline2105.63*2
232Grape SolarGS-S-205-Fab1Monocrystalline2055.52*2
233Grape SolarGS-P-205-Fab1Polycrystalline2055.51*2
234Grape SolarGS-S-200-Fab1Monocrystalline2005.39*2
235Grape SolarGS-P-200-Fab1Polycrystalline2005.38*2
236Grape SolarGS-S-195-Fab3Monocrystalline1955.18*2
237Grape SolarGS-S-190-Fab3Monocrystalline1905.06*2
238Grape SolarGS-S-185-Fab3Monocrystalline1854.92*1
239Grape SolarGS-S-180-Fab3Monocrystalline1804.79*1
240Grape SolarGS-S-175-Fab3Monocrystalline1754.66*1
241Grape SolarGS-S-170-Fab3Monocrystalline1704.53*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.