A study of the remaining battery power indication circuit for independent solar cell control systems

An independent solar cell control system operates without supply from an external commercial power source. The system usually consists of solar cells, a storage battery, a DC load and a control circuit. For systems of this kind, it is very important to equip them with a recharge and discharge function that can work efficiently in all seasons and a function with which to tell the battery operation status. This paper is to report on our study of battery recharge and discharge characteristics for designing a circuit that indicates remaining power in the solar-cell battery. The study also includes the developing of a method to design the said circuit, as well as primary performance and field tests on a trial product of the circuit we designed using that method