This book provides an insight help for the learners of solar PV installers and critical checks for roof-top solar photovoltaic (PV) designing and installation.This book also provides major information on basics of solar PV. This book is complete guide for roof-top Photovoltaic installation. It is an project case study on roof-top solar photovoltaic(PV) power plant in terms of designing and installation of a system. The world has seen tremendous growth rate for solar PV power plant installations. The PV industry has experienced a sea change in only five years. The global rate of annual new-built capacities, which was 7 GW in 2009, was 5 times higher in 2013. This book project was carried in 2009 in India with JNN Solar Mission. The Mission has set the ambitious target of deploying 20,000 MW of grid connected solar power by 2022, as a result to achieve grid tariff parity by 2022. Mission will create an enabling policy framework to achieve this objective and make India a global leader in Solar Energy. Since then the whole solar energy scenario is changed, where there was no single MW installation in India, now India is having more than 2753 MW of capacity of Solar Power.