Calculate savings from solar

Each KW generates about 1400 units each year. This translates to a savings of Rs. 12,000 to 13,000 each year on a KW of power. While larger solar systems provide lower capital cost, even a smaller system (such as a 5 KW system) can provide payback in 3-4 years, after which power is free for the remaining part of the 25 years life of the plant.