Solar or Photo Voltaic the technical definition, is no longer a concept. There are millions of solar units generated each day all over the World. India is blessed with ample sunlight and one needs to make use of it to generate power. Most of the Indian states have implemented the Net Metering Policy for Solar PV Rooftops Projects where the power generated and not used can be utilized in the form of unit credits in the next months energy bill. So, no generated power is lost.
The cost of Solar PV systems have drastically reduced making the installation financially viable. Industries, Commercial Building, Malls, Colleges and many locations where power is one of the major raw material, Solar Rooftop is the solution.
For power the generate, the raw material is free. So, once the system is in place, it will keep generating for 25 years to come.
Yes, power electronics, electrical and mechanical engineering plays a big role and therefore for higher capacity systems, do not just go on the per KW cost but check if the supplier is not just another Solarwala riding on the solar wave.