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Is rooftop solar power cheaper than diesel/grid power?

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.Whether solar is more expensive than grid power depends on your current tariff. Solar power is not cheaper than grid power for many consumers but in some cases, such as consumers paying a commercial tariff, solar power may be cheaper than grid power.Read more

Can rooftop solar PV replace diesel entirely?

Whether solar power can replace your diesel consumption entirely depends on a number of factors such as the nature and timing of the load, the extent of load shedding, the area of roof available, etc. Some of the factors that constrain the supply of rooftop solar power include
o Solar power is generated only during the daytime on non-rainy days
o Solar power may not handle the heavy starting currents required by heavy machinery
o The output of the solar plant varies as the sun moves across the sky, and as clouds move across the sun
o Limited roof area constrains the capacity of solar PV plant that can be installed
Due to these reasons many energy consumers find that rooftop solar power may not support their entire load all the time. Solar power ideally acts in conjunction with diesel generators, taking up part of the load and saving, but not eliminating, the diesel expenditure.Read more

How much electricity does a rooftop solar PV system generate?

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 rule of thumb, a 1 kWp plant will generate about 4 kWh (units) of electricity a day on average in a year.Read more

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

Warranties
Solar panels typically have 5-year manufacturer’s warranty with additional 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 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).Read more

Does rooftop solar PV generate power during a power failure?

Not all rooftop solar plants generate power during a power failure; only some do. The difference lies in the inverter and the functionality it supports. Grid-interactive and hybrid inverters supply electricity even during a power failure while grid-tied and off-grid inverters don’t.Read more

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