for 7.5 hp u require 6600 watts of solar panel 22 panels of 300 watts to meet your requirements, panel per watt = 30 rupees / therefore the panel cost 1.98Lacs & solar invertor cost around 0.4 Lacs / mounting and other structures cost 0.2 Lacs & intallation part of 0.15 Lacs , unforseen expenses...