Q 1) What is Solar Roof Top?

Ans. Solar rooftop, technically referred to as a Solar Photovoltaic (PV) rooftop system, is a decentralized power generation system where solar panels are mounted on the roof of building complexes. These complexes could be residential, commercial, Industry, housing societies, community centers, government organizations, or private institutions.

Q 2) What is Solar Net metering System?

Ans. Several Policies for Solar Plants include Net Metering also. It refers to an incentivizing model where excess power generated by the rooftop plant (such as on holidays or no load utilization day) can be pumped into grid (Export of units) and the client receives a credit for the number of units supplied to the grid against the number of units received from the grid (Import of units) .i.e., it is as if the meter ran in reverse when power flowed from the roof top plant into the grid.

Q 3) How can we monitor the import and export of units?

Ans. A net meter (also known as bi-directional meter) to be installed at the customer premises replacing the gross meter (also known as Single direction electric meter). The difference of import and export is monitored in the form of IM (Import), EP (Export) and NR (Net Reading)

Q 4) Who will install the meter at customer premises?

Ans. Electricity Department will install the meter.

Q 5) What are the components used to install Solar Net Metering Plant?

Ans. Solar PV Modules, Grid-Tied Inverters, Solar Accessories, Cables, Earthling & Lightening Arrestors and Solar Module Mounting Structure (MMS) as well as BOS (balancing of Structure) and then connecting to the Bidirectional Meter.

Q 6) What is the life of Solar Panel and Inverter?

Ans. Normally, the solar panels last longer than 40-45 years, but there are mandatory performance warranty for 25 years; whereas solar inverters we are warranted for 2-5 years.

Q 7) What are the Warranties and Certifications I should look for in my rooftop PV system?

WARRANTIES Solar panels typically have 25-year manufacturer's warranty out of this the performance warranty of 90% of rated power output for first 10 years, and 80% of rated power output for the next 15 years. Other system components (inverters, mounting structures, batteries, junction boxes, etc.) typically have 1-year manufacturer's warranty extendable up to 5 years.
CERTIFICATIONS 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).

Q 8) What are the various policies and regulations (subsidies, incentives, permissions) that I should consider for my rooftop solar systems?

Ans. There are various solar policies that incentivize rooftop solar in India. Central government schemes include 40% accelerated depreciation, capital subsidy of 30% (NPO) and more based on location, and Renewable Energy Certificates (RECs). Some states have further incentives under their own solar policies. There is no Subsidy on industrial or commercial organizations as of now.

Q 9) How much units does a Solar Roof Top Plants produces per Day?

Ans. The amount of electricity generated by a rooftop solar PV plant depends on the location, orientation of the roof, panel efficiency, and ambient temperature. As a thumb rule, a 1 KW power plant will generate about 4 kWh (units) of electricity per day on an average, on yearly basis.

Q 10) Is rooftop solar power cheaper than diesel/grid power?

Ans. Rooftop solar power is much cheaper than power from diesel generators. Solar PV generates power at a cost of about Rs. 4.5-5/KWh while diesel generates power at about Rs. 16/KWh.

Q 11) How much roof area do I require to install a rooftop solar PV system?

Ans. The area required by a rooftop PV plant depends on the extent of shade-free space available and solar panel efficiency. A solar PV system typically requires about 80 to 90 sq. ft. of shade free area per kW of the capacity at current crystalline panel efficiency levels.

Q 12) Does rooftop Grid-tied solar PV generate power during a power failure?

Ans. No, grid tied solar plants does not generate power during a power failure, but an alternative arrangements can be made by supplying an auxiliary power source with some manual changeover/ switch to the Grid Tie inverters for generating the Grid' reference index..