The area required by a rooftop PV plant depends on the extent of shade-free space available and solar panel efficiency. Approximately 100 sq.ft of roof space is required for 1 kW of solar of capacity at current crystalline panel efficiency levels.
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FAQ
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HOW MUCH ROOF AREA DO I NEED FOR A SOLAR PV SYSTEM INSTALLATION ?
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DO I NEED TO HAVE SOUTH FACING EXPOSURE TO HAVE A SOLAR ENERGY SYSTEM ?Although southern exposure increases the effectiveness of a residential solar power system, your home may still work for solar power without having south facing exposure. You may want to seek consultation from our professional solar designer or installer to ensure success.
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SHOULD THE EXPOSURE BE COMPLETELY FREE OF TREES OR BUILDINGS THAT COULD SHADE THE PANELS OR DROP DEBRIS ON THEM ?Yes, it is advised for the exposure to be completely free of trees or buildings that could shade the panels, for the panels to work at highest efficiency.
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WHAT IS THE SIZE OF SOLAR PV DOMESTIC AND COMMERCIAL PLANTS ?Identifying the Solar Power plant size for your domestic or commercial premises depends on the following factors:
Roof space available for plant setup
Availability of Net Metering Policy in the Region of Installation, and an understanding of the relevant policy.
Monthly energy consumption of the Establishment/ Residence -
HOW MANY UNITS OF ENERGY ARE GENERATED FROM A 5 KW SOLAR PV SYSTEM?Taking into account the irradiation level in India a Rooftop Solar PV system produces an average of about 5 KWh/day for every 1 KWp of panel capacity installed. However, Rooftop PV plant output may change depending on the Location, Roof Orientation, Panel efficiency and ambient temperatures of the rooftop on which it is installed.
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WILL MY SYSTEM WORK AT NIGHT ?At night, you continue to draw power from your utility. Sunlight must be present for your solar modules to produce power.
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WILL MY SYSTEM WORK ON CLOUDY DAYS?At night, you continue to draw power from your utility. Sunlight must be present for your solar modules to produce power.
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WHAT IS ITS WARRANTY PERIOD?Solar panels have at least 10-year manufacturing defect warranty and a 25-year output warranty (typically 90% of power output at year 10 and 80% of power output at year 25). The warranty of the panels may also extend upto 10 years.
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HOW LONG IS THE SOLAR SYSTEM EXPECTED TO FUNCTION PROPERLY ?The solar system typically lasts for 25 years.
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HOW WILL I KNOW IF THE SYSTEM IS WORKING ?Today nearly all inverters come with built-in monitoring that varies based on manufacturer. By reconciling your production with your electric bill, you can get a good idea what your household’s electric load is and how much of a difference the photovoltaic system is making.
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IS A BATTERY BACKUP RECOMMENDED FOR MY SOLAR PANELS SYSTEM ?No – A backup battery bank can add as much as 25% in cost to a residential solar PV system. It’s not necessarily more efficient either – a same sized solar array will yield about 7–10% less energy if it’s battery-tied than its grid-tied counterpart. Most solar photovoltaic experts do not recommend adding a backup battery system unless there is concern about a long utility outage or the residence is in a remote location.
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WILL I NEED CERTIFICATIONS/PERMISSIONS FROM EXTERNAL AUTHORITIES TO INSTALL SOLAR PANELS ON MY ROOF ?Each component of the plant should conform to various IEC (international) or IS (Indian) standards. Panels should conform to IEC 61215/IS 14286 for design qualification and type approval, IEC 61730 for safety, and IEC 61701/IS 61701 for salt mist corrosion (for use in coastal areas).
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WHAT HAPPENS DURING A POWER OUTAGE ?There are 3 possibilities depending on the type of system you have installed:
Hybrid Plant: This will synchronize with the Backup power system (DG set, Power Inverter) and continue to provide youSolarelectricity
Grid-Tied: This will provide power during daylight hours but will not provide power in an outage to ensure the safety of the people working on the grid
Off Grid: This will provide power during daylight hours and has a battery backup designed to provide power to critical loads during an outage, day or night.
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WHAT IS NET METERING & HOW DOES IT WORK ?Net metering is a method by which solar PV plant owners can be compensated for any excess solar power that they supply to the grid. The conventional uni-directional electricity meter is replaced with a bidirectional meter that spins in reverse for energy that is supplied to the grid. The consumer is billed by the utility only on the net energy consumption indicated by the meter.
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CAN ACCELERATED DEPRECIATION BENEFITS BE CLAIMED BY SOLAR POWER DEVELOPERS ?Yes. Accelerated Depreciation benefits can be claimed by Off-Grid and Grid-Connected Solar Power Developers in order to offset taxes on profits from their connected businesses. Typically, 90% depreciation is allowed with 80% allowed in the first year.