technical bid
SOLAR PHOTOVOLTAIC
SYSTEM PROPOSAL
SYSTEM PROPOSAL FOR 10 kwp GRID CONNECTED SOLAR PV SYSTEM
Customer:
P.N.G. eXPORTS,
18,ESWAR NAGAR,
SBI COLONY,GANDHI NAGAR,
TIRUPPUR -641603
cONTENT
1. INTRODUCTION 3
2. SYSTEM DESIGN 6
3. SYSTEM DESCRIPTION 12
4. SYSTEM CONFIGURATION 13
5. BILL OF MATERIAL 18
1. INTRODUCTION
i. COMPANY PROFILE
ii. SCOPE OF WORK
With reference to scope of work SOLITAIRE shall be engaging in ENGINEERING, PROCUREMENT & CONSTRUCTION (EPC) activities in setting up Grid connected Solar Photovoltaic Plants, which shall include,
- System Design & Engineering
- Supply of all project related material (Such as PV modules, inverters, control panels etc.,)
- Civil activities which shall consist of module foundation and cable trench construction.
- Installation & commissioning of all electrical components up to grid interactive metering panel
- Project planning & controlling
The activities that SOLITAIRE shall exclude from its scope of work are as follows:
- Area / land selection for plant set up
- Area / land preparation for module foundation construction
- Statutory and regulatory approvals from the local or relevant authorities for plant set up and commissioning
- Facility to export electricity from the grid interactive metering panel to the nearest sub station / public utility
- All the technical support & documentation required will be supported by SOLITAIRE.
2. SYSTEM DESIGN
i. CUSTOMER REQUIREMENT
The Customer would like to install 10 kWp Gird connected Solar Power Plant in P.N.G EXPORTS,…TIRUPPUR……………………………..
ii. DESIGN ASSUMPTIONS
Annual average sunshine Hrs/day : 5.6 Hrs NASA data
Module Facing : True South
Module Tilt angle : 13°
Type of System : Grid Connected System
iii. PROPOSED TECHNOLOGY
The on-grid solar photovoltaic power plant to be proposed shall be consisting of Poly / Multi crystalline solar modules with fixed tilt angle mounting systems and the solar inverters shall be of grid interactive central type.
iv. BENEFITS OF PROPOSED TECHNOLOGY
The benefit of crystalline technology as compared to other existing technologies is as follows;
- It occupies less area when compared to other thin film technologies
- Proven technology over years
- Abundant semiconductor materials to support high volume production and demand.
- High volumes of production facilities throughout world
v. ENERGY SIMULATION RESULT
Based on the above inputs & assumption, an energy simulation has been carried out and the results for the same are provided below.
vi. DESIGN SUMMARY
Total Installed capacity : 10 kWp
PV Module : 250Wp Crystalline Modules
Total Number of Modules : 40 Numbers
String Inverter : 11 kw
Total Number of Inverters : 1 Nos.
Approx yearly generation / MWp : 15.69 Mwh / year **
Approx Yearly generation : 15.69 MWh/annum**
Module Tilt angle :1 3 Deg
Module orientation : True South
Area required for module installation : 110 Sq.mtrs.
** Note:
1. The above values are indicative for the location based on the historical radiation data. The actual data may vary depending on the site conditions.
vii. MODULE ARRAY LAYOUT
Based on the above design output the proposed array layout is provided below for reference.
3. SYSTEM DESCRIPTION
i. Solar PV Grid Connected System
A grid connected system is connected to a large independent grid (typically the public electricity grid) and feeds power into the grid. This is a form of decentralized electricity generation. In the case of residential or building mounted grid connected PV systems, the electricity demand of the building is met by the PV system. Only the excess is fed into the grid when there is an excess. The feeding of electricity into the grid requires the transformation of DC into AC by a special, grid-controlled inverter.
A grid-tie inverter or a (GTI) is a special type of Inverter (electrical) that is used in a renewable energy power system to convert direct current into alternating current and feed it into the utility grid. The technical name for a grid-tie inverter is "grid-interactive inverter". They may also be called synchronous inverters. Grid-interactive inverters typically cannot be used in standalone applications where utility power is not available.
The Delta Grid Tie Solar Inverter is designed to convert solar electric (photovoltaic or PV) power into utility-grade electricity that can be used by the home or sold to the local power company. In order to operate, the inverter must have grid power available and connected. It will not provide backup power if the AC grid fails. The inverter will automatically synchronize itself to grid. The inverter is provided with the isolation transformer internally with basic insulation.
4. SYSTEM CONFIGURATION
The major components of the proposed power plant are as follows:
Sl. No. / Item / Description1 / Module / Crystalline solar modules each of 250 Wp
2 / Structure / Fixed Mounting
3 / Inverter / String inverter of 11 kw
4 / Monitoring System / Central Monitoring system
Irradiation/Temp Sensor
5 / Junction box / DC Combiner Box (DCCB)
AC Distribution Box (ACDB)
6 / Cables / PVC Cu Cables
7 / Accessories / Accessories for cable interconnection & installation kit & conduits
8 / Lightning / Lightning Protection Units
Solar PV Modules:
Solar cells produce direct current electricity from light, which can be used to power equipment or to recharge a battery. Cells require protection from the environment and are usually packaged tightly behind a glass sheet. When more power is required than a single cell can deliver, cells are electrically connected together to form photovoltaic modules, or solar panels. A photovoltaic module is a packaged interconnected assembly of photovoltaic cells, which converts sunlight into electrical power. The cells are hermitically sealed between glass and back cover (Tedlar) to protect them from harsh environments.
The detail technical specifications of both types of modules are provided below.
Technical Specifications for Crystalline ModulesOutput power – Pmax (Watts) / 250 Wp +3%
Voltage at Pmax / 29.95 V
Current at Pmax / 8.35 A
Open-circuit voltage / 37.25 V
Short circuit current / 8.70A
Maximum system voltage (Volts) / IEC: DC 1000V / UL: DC600V
Efficiency / 14.29%
Type of solar PV cell / Poly / Multi - Crystalline silicon
Suitability / For on / off grid connected system
Module output / Tyco electronics plug (male and female)
Certification / IEC 61215, IEC 61730, UL1703
Power warranty / · 25-year limited warranty on power output & 5-year product warranty
· 25-year performance warranty
- 10 years: 90% minimum performance - 25 years: 80% minimum performance
Module Mounting Structures:
The module mounting structure is designed for holding suitable number of modules in series. The frames and leg assemblies of the module mounting structures is of Mild Steel hot dip galvanized of suitable sections of Angle, Channel, Tubes or any other sections conforming to IS:2062 to meet the design criteria. All hardware considered for fastening modules with this structure are of very good quality of Stainless Steel (SS304). The module mounting structure is designed in such a way that it will occupy minimum space without sacrificing the output from SPV panels at the same time it will withstand severe wind speed up to a maximum 120 kmph.
Technical Specification – Module Mounting StructuresMaterial / MS Galvanized / Aluminium
Overall dimension / As per design
Coating / Hot dip Galvanized with 80 micron
thickness for MS & Anodizing for Aluminium
Wind rating / 120 km/hr
Tilt angle / Fixed angle, depends on the site latitude
Foundation / PCC for roof top fixing
Fixing type / SS 304 fasteners
Junction Boxes:
The junction boxes are of dust, vermin, and waterproof and made of Thermo Plastic. The terminals will be connected to copper bus-bar arrangement of proper sizes. The junction boxes will have suitable cable entry points fitted with cable glands of appropriate sizes for both incoming and out going cables.
Technical Specification – Junction BoxesMaterial / Thermoplastic
Type / Dust, Vermin & Water proof
Hardware / SS 304
Cable Gland / Thermoplastic
Protection / IP 65
Delta Grid Connect Inverter:
Monitoring System:
Monitoring systems is mainly used to monitor the performance of the Inverter, energy yield, temperature, irradiance level etc. It provides an extremely flexible interface to facilitate PC-based inverter monitoring and control via analog modem, GSM, Ethernet, or Internet connections.
Industry-Leading Features and Performance:
· Inverter monitoring parameters include: energy yield, power, array voltages, array currents, AC parameters, and temperatures.
· Environmental-sensor interface capabilities include: temperature, wind speed, and light conditions.
Field-Proven Reliability:
· Enhanced remote-monitoring capabilities enable the collection and analysis of critical data needed to facilitate increased power system reliability.
Installer Friendly:
· A front-mounted LCD display provides visual confirmation of all critical operating parameters.
· Compact easy-to-install package with readily-accessible electrical connections.
Unmatched Applications Flexibility:
· Active alarm management capabilities with automatic delivery of SMS, e-mail, or fax alarm messages.
· Data logger and display-enabled configurations are available.
Cables:
Technical Specification – CablesType / PV Insulated, sheath & UV resistance
Material / Copper
Voltage / Max. 1100V
Test Voltage / 650V/1.1V
Temperature / 10 – 70 °C
Colour / Red/ Black / Green
The size of the cables between array interconnections, array to junction boxes, junction boxes to Charge controller etc is so selected to keep the voltage drop and losses to the minimum.
The bright annealed 99.97% pure bare copper conductors that offer low conductor resistance, they result in lower heating thereby increase in life and savings in power consumption. These wires are insulated with a special grade PVC compound formulated and manufactured in-house. The skin coloration offers high insulation resistance and long life.
Earthing & Lightning Protection:
Earthing: The array structure of the PV yard will be grounded properly using adequate number of earthing kits. All metal casing / shielding of the plant shall be thoroughly grounded to ensure safety of the power plant.
Lightning: The SPV Power Plant shall be provided with lightning & over voltage protection. The main aim in this protection shall be to reduce the over voltage to a tolerable value before it reaches the PV or other sub system components. The source of over voltage can be lightning, atmosphere disturbances etc. Metal oxide variastors shall be provided inside the Array Junction Boxes. In addition suitable MOV’s also shall be provided in the Inverter to protect the inverter from over voltage.
5. BILL OF MATERIAL
The brief bill of material is provided below as ready reference.
Sl.No. / Description / Quantity1 / 250Wp Crystalline Modules / 40 Nos.
2 / 12 Module Mounting Structures / 3 set
3 / 11kW String Inverter / 1 No
4 / Monitoring System / 1 Set
5 / Earthing & lightning protection / 1 Set
6 / Junction boxes / 1 Set
7 / Cables / As required
8 / Accessories / 1 Set