The controller effectively applies solar energy DC supply system design, utilizes intelligent microprocessor control and adopts cascade connected PWM battery charging technology to ensure the batteries work with optimum behavior and extend the battery life greatly. The controller has a strong protection of short circuit, overload, over charge, over discharge, and disposition. It also has the automatic self-recovery function. It has 8 kinds of control mode such as light control, manual control, time delay, line control and so on. Delay time can be adjusted from 1 to 15 hours to meet the needs of customers.