Sample of Maharastra Site Snail Trail Modules performance Data Report By: Shiv Verma

Design Vs Actual Generation:-

Aprl May June July Aug Sep010002000300040005000600070008000

50.%60.%70.%80.%90.%100.%110.%120.%

Desaign vs Actual vs targeted Generation, 37.5MW DC

Design Gen. MWh Actual Export. MWh % Gain Degn Vs Actual Taget for FY-2015-16Month

Gene

ratio

n in

MW

Gen

Desig

n vs

Act

ual i

n %

Net PR and CUF of PLANT: -

Jan Feb. Mar Apr May June July Aug Sept.0.0%10.0%20.0%30.0%40.0%50.0%60.0%70.0%80.0%90.0%

100.0%CUF & PR of Plant 37.5 MW DC, Maharashtra Site

Per

cent

age

37.5MW DC (32MW AC)_CUF & PR in % Maharashtra DataMonth 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%

Plant & Grid Availability :-

Jan Feb. Mar April May June July Aug Sep0

100

200

300

400

500

600

95.50096.00096.50097.00097.50098.00098.50099.00099.500100.000100.500

Inverter Down Time (Minute) Grid Down Time (Minute) Grid Gen Loss (MWh)INV Gen Loss (MWh) Plant Availability in % Grid Availibility in %

37.5MW DC Plant Availability Vs Grid & Plant Down Time

Tim

e in

Min

ute

Avai

labi

lity

in %

37.5MW DC (32MW AC) Grid & Plant Down Time, Plant & Grid Availability and Contribution of Losses Mont

hInverter Down Time (Minute)

Grid Down Time (Minute)

Plant Availability in %

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 0May 5.6 60 99.975 99.729 0 0.69 0June 35.6 135 99.835 99.375 30.63 5.508 0.34July 94.0 226 99.565 98.954 12.61 39.27 0.05Aug 19.3 0 99.911 100.000 0.00 2.78 0.01Sep 5.6 06:00 99.974 99.999 3.08 0.79 1.13

Jan Feb Mar Apr May June July Aug Sep0.01000.02000.03000.04000.05000.06000.07000.0

0.0%0.5%1.0%1.5%2.0%2.5%

37.5MW DC (32MW AC) HT Transmission Losses w.r.t. Inv. Gen.

Gene

ratio

n in

MW

h

Gen

Loss

in %

Generation Loses due to Breakdown:- Jul Main contactor fault

11%Jul DI 4 Fault

3%Aug Earth fault

13%

Sep DC Switch Break Posi-tion5%

Sep Main contac-tor fault

69%

14MW Major faults distribution

13% 2%1%

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

Generation of 14 MW:-

April May June July Aug Sep0.0

500000.0

1000000.0

1500000.0

2000000.0

0%

5%

10%

15%

20%14MW DC(13MWAC) Generation Vs Actual CUF Vs Targeted

CUF in %

Gene

ratio

n in

KW

h

CUF i

n %

Rout-cause Analysis:-

Some strings / modules observed underperformance as per contract specification (modules showing under performance up to 40%) as per attached photograph 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 0TSM-305 Dt. 10/10/2015 13:19:00 Not Ok (-

22.64%)

1 2

3 4

Defect in Modules:-

Snail trail:- Snail Trail (Snail rail) basically micro cracks in solar cell during encapsulation of EVA and lamination, sometimes cracks increase and seems visible on modules. If cracks increase horizontal to 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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 300

50

100

150

200

250

300

350

012345678910

6.0

4.85.95.6

5.9

4.94.94.4

3.1

4.84.85.6

4.44.03.7 4.14.3

1.3

6.66.05.4

4.9

6.06.26.86.97.26.6

5.96.1

Power Generation (Exp &Imp) v/s Irradiance & Module clean-ing Sep'15

Daily Gen. MW Module Cleaning in thousand Irradiance averageEnergy Import In MWh

Date

Powe

r Gen

ratio

n in

MW

Irrad

iatio

n in

KW

h/m

2

Cloudy Weather and Rain

Thanks & RegardsShiv Kumar Verma+91 9971772141