As a quick example let’s assume you will use 1 Kwh per day in New Delhi, and another for Dehradun using 12 volt battery Battery capacity is the same for both locations [1000 wh x 5] / 12 volts = 416 AH at 12 volts. Panel wattage needed in Delhi is based on winter Sun Hours of 5.6 hours so panel wattage = [1000 wh x 1.5] / 5.6 h = 267 watts. So using a 270 watt panel with a MPPT controller you max charge current is 270 w / 12 volts = 22.5 amps, or roughly a C/20 charge rate In Dehradun the winter insolation is 1.2 hours so panel wattage = [1000 wh x 1.5] / 1.2 h = 1250 watts. So with MPPT charge controller the max current is 1250 w / 12 v = 104 amps or roughly C/4 charge rate which would likely demand AGM batteries for that high of a charge rate. Courtesy: Edited from SolarPanel Forum.