This document summarizes a site visit to a 10kWp solar power plant installed at the National Buildings Construction Corporation Ltd. (NBCC) in New Delhi. The plant uses 60 photovoltaic modules arranged in 20 series strings of 3 parallel combinations each, for a total capacity of 10kWp. Electrical and performance data is provided from the inverter display. Details are given on the solar modules, inverter, mounting structure, installation, and technical specifications of the plant.

1. A
REPORT ON VISIT TO
NATIONAL BUILDING CONSTRUCTION
CORPORATION LTD.
ON – GRID SOLAR POWER PLANT OF 10KWp
PREPARED BY:
AMITESH KUMAR

2. VISIT TO NBCC ON-GRID 10KWp SOLAR POWER PLANT | Amitesh
DATE: 11 NOV 2014
Site Name: National Buildings Construction Corporation Ltd. (NBCC) Ghitorni, New Delhi – 110003
Latitude: 29º01' Degree North
Longitude: 77º38' Degree East
Figure: 1 Side View of the plant Installed at NBCC, Ghitorni having a capacity of 10KWp
The installation of on-grid solar power plant at NBCC, Ghitorni has a capacity of 10KWp. It is a fixed installation
facing towards south and an installation angle (β) of 30ᵒ.
Electrical Specifications:
Module PM – 170.
No. of modules in Series – 20.
Parallel Combination – 3.
No. of FJB – 3.
Module wire – 1x4 Sq.mm.
Conduit Wiring – P.V.C conduit 32mm.
Civil foundation - Angle Bar – 50x50x6 (structure and legs)
Pile – 1x1 Foot.
Data Obtained From Inverter Display at 1:20 PM
DC Side V (Volt) I (Amps) V (Volt) I (Amps)
String 1 617 6.4 To Grid 241 8.1
String 2 598 3.0
String 3

3. VISIT TO NBCC ON-GRID 10KWp SOLAR POWER PLANT | Amitesh
Balance of System (BOS) Described:
1. SPV ARRAY
The SPV array of 10 KWp capacity consist of 60no. Of modules of PM160 wired in 20 series- 3 parallel
configuration. The modules shall be fixed on corrosion resistantMS structures. The SPV module has 72 number
of crystalline silicon solar cells connected in series and hermetically sealed with high transmission toughened
glass on top and suitable lamination material on back using state-of-the-art technology. The laminates are
framed using anodized aluminum channels. A terminal block is fixed on the frames for taking the electrical
output. The SPV array is grouted on Galvanized MS support structure on the ground near the buildings.
2. INVERTER
The SUNNY TRIPOWER solar inverters characterize the technology and are optimally suitable for use in small
and mid-range systems. These inverters have first class efficiency, user-friendliness and reliability and come with
innovative technologies such as OptiTrac and H5-Topology. These make the device even more efficient and
therefore ensure a very good solar yield. Automatic grid voltage detection and an integrated DC disconnect
switch simplifies installation, ensuring safety as well as saving time. These models feature galvanic isolation and
can be used with all types of modules. The die-cast aluminium enclosure, with the OptiCool active temperature
management system, guarantees the highest yields possible and a long service life, even under extreme
conditions.
Figure: 1 Sunny TriPower Inverter (Left) & LCD Display (Right)

4. VISIT TO NBCC ON-GRID 10KWp SOLAR POWER PLANT | Amitesh
3. GROUNDING OF THE SPV ARRAY
All the non-current carrying panel structures are connected with the earth pit. Apart from this, all other non-
current carrying metallic parts such as FJB and Inverter have also been earthed.
Figure: 2 Interconnection between Structures for grounding (Left) & Earth Pit (Right)
4. SUPPORT STRUCTURES
The modules are mounted on support structures fabricated from Mild steel, which are fixed on the ground as
shown in the drawing. The structures are hot dip galvanized to make them non-corrosive and long lasting.
Twelve Structures Carry 5 Modules each (Total Modules 60 Nos.). The structures are designed so as to withstand
a horizontal wind speed of 150 KMPH.
Figure: 3 Pile Single bolt foundation

5. VISIT TO NBCC ON-GRID 10KWp SOLAR POWER PLANT | Amitesh
5. The technical specifications of the recommended SPV Plant are as follows:
General
SPV Module
SPV Array Power (Total 10 KWp)
Module type Crystalline silicon
Module power PM160 (160Wp-170Wp)
Inverter
Rating 10KW
Mounting Indoor inside control room (provided by Customer)
No. of Inverters 1
Enclosures IP 20
Other accessories
Cables BIS Copper Conductors
Module mounting frame Galvanized MS frame
6. Module Data Sheet:
SOLAR PV MODULE PM 160
ELECTRICAL PARAMETERS
Maximum Power Rating (Wp) 160
Minimum Power Rating (Wp) 150
Rated Current Im (Amps) 4.45
Rated Voltage Vm (Volts) 36
Short Circuit Current Isc (Amps) 5.0
Open Circuit Voltage Voc (Volts) 44
PHYSICAL PARAMETERS

6. VISIT TO NBCC ON-GRID 10KWp SOLAR POWER PLANT | Amitesh
No. of Cells 72
Dimensions (approx.) 1580(L)x805(W)x42(T)
Weight (Kg) 14.5
ENVIRONMENTAL RATINGS
Nominal Operating Cell Temp.(C) 492
Max. Allowed Module Temp.(C) -40 to + 85
Max. Allowed System Voltage(V) 1000
RH at 85C 85
Temp. Coefficient of Isc +0.0004/K
Temp. Coefficient of Voc -0.0034/K
7. Inverter Specifications
SUNNY TRIPOWER 10000TL
Input (DC) Output (AC)
Max DC Power (@ Cos Ф=
1)
10200 Rated Power (@ 230 V,
50 Hz)
10000 W
Max. Input voltage 1000 Max. Apparent AC power 10000VA
MPP Voltage Range /
Rated input voltage
320 V – 800 V / 600 V Nominal AC voltage
range
160 V – 280 V
Min. Input Voltage / Initial
input voltage
150 A / 180 A AC power frequency /
range
50 Hz, 60Hz / -6 Hz ...
+5 Hz
Max. Input Current Input
A/ Input B
22 A / 11A Rated grid frequency /
rated grid voltage
50 Hz / 230 V
Max. Input Current Per
String Input A/ Input B
33 A / 12.5 A Max. output current 16 A
Number Of Independent
MPP Inputs / Strings per
MPP input
2 / A: 4; B: 1 Adjustable displacement
factor
0.8 over exited ... 0.8
Under exited