Solar charge controllers help in managing the power that goes into battery bank from the rays of the sun, by ensuring the deep cycle batteries are not overcharged during the day. It also regulates the battery in a manner that the power gained during the day does not run backwards to the solar panels during the night to drain the batteries. The primary role of the solar charge controller is to manage the power in the battery although there are some charge controllers that have additional capabilities like lighting and load control. Charge controllers are available in two technologies; PMW and MPPT and their performance are different from each other. PMW (Pulse Width Modulation) operate by making a direct connection from the solar array to the battery bank such that when there is a continuous connection from the array to the battery bank, the output voltage of the solar array is instantly ‘pulled down’ to the level of the battery voltage otherwise the battery would not charge.