Main source of energy the CES building is the 6.5 kWp capacity of Solar PV system, 100 no. of Solar PV modules each of 65 Watt peak are kept as a roof on the main entrance of the building. The slope of the panel is 30° North-South. With the sunshine hours of 4.15 hour peak sun a day, it generates electricity of 27 kWh in a day.
The electricity generated is stored in battery banks kept at the basement of the building. 120 batteries of heavy duty nature, each of 2 Volt capacity 468 AH, all are connected in series which produce 240 Volts. Such two batteries banks are connected in parallel and each produces 240 Volt DC. An automatic software controlled inverter continuously monitors the whole process of the electricity generation from solar panel, storing in batteries and the connection to the grid as well. The inverter also supplies the excess power generated to the campus grid.