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 is offset with the consuming units from State Discom.
The cost of Solar PV systems has 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.
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.