1. Sample of Maharastra Site Snail Trail Modules performance Data Report By: Shiv Verma
Design Vs Actual Generation:-
Net PR and CUF of PLANT: -
37.5MW DC (32MW AC)_CUF & PR in % Maharashtra Data
Month Design CUF in % Actual CUF in % Design PR in % Actual PR in % Inv. PR in %
Jan 17.4% 18.2% 75.37% 75.2% 76.63%
Feb. 17.9% 20.9% 73.71% 77.8% 79.32%
Mar 18.8% 20.8% 72.46% 80.6% 81.93%
Apr 21.4% 21.6% 70.30% 78.5% 80.16%
May 20.9% 20.5% 71.72% 81.9% 83.75%
June 16.9% 17.1% 74.82% 87.0% 88.91%
July 13.9% 15.5% 75.51% 84.3% 86.14%
Aug 14.2% 15.4% 75.21% 84.3% 86.33%
Sept. 17.1% 17.3% 75.04% 81.9% 83.76%
50.%
60.%
70.%
80.%
90.%
100.%
110.%
120.%
0
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Aprl May June July Aug Sep
GenDesignvsActualin%
GenerationinMW
Month
Desaign vs Actual vs targeted Generation, 37.5MW DC
Design Gen. MWh Actual Export. MWh % Gain Degn Vs Actual Taget for FY-2015-16
Jan Feb. Mar Apr May June July Aug Sept.
Design CUF in % 17.4% 17.9% 18.8% 21.4% 20.9% 16.9% 13.9% 14.2% 17.1%
Actual CUF in % 18.2% 20.9% 20.8% 21.6% 20.5% 17.1% 15.5% 15.4% 17.3%
Design PR in % 75.37% 73.71% 72.46% 70.30% 71.72% 74.82% 75.51% 75.21% 75.04%
Actual PR in % 75.2% 77.8% 80.6% 78.5% 81.9% 87.0% 84.3% 84.3% 81.9%
Inv. PR in % 76.63% 79.32% 81.93% 80.16% 83.75% 88.91% 86.14% 86.33% 83.76%
0.0%
10.0%
20.0%
30.0%
40.0%
50.0%
60.0%
70.0%
80.0%
90.0%
100.0%
Percentage
CUF & PR of Plant 37.5 MW DC, Maharashtra Site

2. Plant & Grid Availability :-
37.5MW DC (32MW AC) Grid & Plant Down Time, Plant & Grid Availability and Contribution of Losses
Month
Inverter Down
Time (Minute)
Grid Down
Time (Minute)
Plant
Availabilityin %
Grid Availability
in %
Grid Gen Loss
(MWh)
INV Gen Loss
(MWh)
String Ground
Fault Loss in MW
Jan 120 564 99.412 97.235 120.2 40.0
Feb. 25 138 99.870 99.284 33.0 4.12
Mar 6 60 99.971 99.729 3.8 1.8
April 0 0 100.000 100.000 0 0 0
May 5.6 60 99.975 99.729 0 0.69 0
June 35.6 135 99.835 99.375 30.63 5.508 0.34
July 94.0 226 99.565 98.954 12.61 39.27 0.05
Aug 19.3 0 99.911 100.000 0.00 2.78 0.01
Sep 5.6 06:00 99.974 99.999 3.08 0.79 1.13
95.500
96.000
96.500
97.000
97.500
98.000
98.500
99.000
99.500
100.000
100.500
0
100
200
300
400
500
600
Jan Feb. Mar April May June July Aug Sep
Availabilityin%
TimeinMinute
37.5MW DC Plant Availability Vs Grid & Plant Down Time
Inverter Down Time (Minute) Grid Down Time (Minute) Grid Gen Loss (MWh)
INV Gen Loss (MWh) Plant Availability in % Grid Availibility in %
Jan
Fe
b
Ma
r
Apr
Ma
y
Jun
e
Jul
y
Au
g
Se
p
Inv Gen in MWh 4938.9 5375.5 5914.0 5963.9 5831.2 4706.1 4408.8 4380.8 4929.9
Export Energy in MWh 4857.8 5281.2 5800.7 5844.2 5714.9 4615.1 4325.2 4288.3 4834.8
Transmission Loss in MWh 81.1 94.3 113.3 119.7 116.3 91.0 83.59 92.44 95.14
Loss in % 1.67% 1.79% 1.95% 2.05% 2.03% 1.97% 1.93% 2.16% 1.97%
0.0%
0.5%
1.0%
1.5%
2.0%
2.5%
0.0
1000.0
2000.0
3000.0
4000.0
5000.0
6000.0
7000.0
GenLossin%
GenerationinMWh
37.5MW DC (32MW AC) HT Transmission Losses w.r.t. Inv. Gen.

3. Generation Loses due to Breakdown:-
Generation of 14 MW:-
Jul Main contactor
fault
11%
Jul DI 4 Fault
2%
Aug Earth fault
13%
Sep DC Switch
Break Position
5%
Sep Main
contactor fault
69%
14MW Major faults distribution
13% 2%
0%
44%
41%
36MW String Ground Faults
June String Ground Fault
July String Ground Fault
August String Ground Fault
September String Ground Fault
September Inv start delay due to
Ground Fault
April May June July Aug Sep
Monthly Gen in KWh 642944.0 1645071.5 1743166.6 1618383.5 1605469.6 1799700.0
Import in KWh 12791.8 12901.8 11928.4 13349.2 14653.3 16653.3
Net Gen in KWh 630152.3 1632169.7 1731238.2 1605034.4 1590816.3 1783046.7
Net CUF in% 6.25% 15.66% 17.17% 15.40% 15.27% 17.68%
Targeted CUF in % 19% 19% 19% 19% 19% 19%
0%
2%
4%
6%
8%
10%
12%
14%
16%
18%
20%
0.0
200000.0
400000.0
600000.0
800000.0
1000000.0
1200000.0
1400000.0
1600000.0
1800000.0
2000000.0
CUFin%
GenerationinKWh
14MW DC(13MWAC) Generation Vs Actual CUF Vs Targeted CUF in %

4. Rout-cause Analysis:-
Some strings / modules observed underperformance as per contract specification
(modules showing under performance up to 40%) as per attachedphotograph 1,2,3 &
4, String No 1.
Block 8, S1 S1M15
Nmod Pmax Voc Vmpp Impp Isc Irradiance Module Temp FF Temp. alpha beta tol+ tol-
Measures@OPC 1 166.12 38.4 30.1 5.52 6.77 851 76.8 64 Auto 0.046 -0.3 3 0
Meas Avg@OPC 1 166.12 38.4 30.1 5.52 6.77 851 76.8 64 Auto 0.046 -0.3 3 0
STC 1 235.96 45.4 36.6 6.45 7.59 1000 25 68 Auto 0.046 -0.3 3 0
Nominal 1 305 45.4 37 8.25 8.75 1000 25 77 Auto 0.046 -0.3 3 0
TSM-305 Dt. 10/10/2015 13:19:00 Not Ok (-22.64%)
1 2

5. Defect in Modules:-
Snail trail:-
3 4

6. Snail Trail (Snail rail) basicallymicrocracks in solar cell duringencapsulationof EVA
and lamination, sometimes cracks increase and seems visible on modules. If cracks
increase horizontalto the grid line the impact is very less but if its vertical then impact
on module will be high. Voc of snail trail defect modules are same, we can identify
performance with PV-IV curve characteristic only.
I
Thanks & Regards
Shiv Kumar Verma
+91 9971772141
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IrradiationinKWh/m2
PowerGenrationinMW
Date
Power Generation (Exp &Imp) v/s Irradiance & Module cleaning Sep'15
Daily Gen. MW Irradiance average
Energy Import In MWh Module Cleaning in thousand
Cloudy Weather and Rain