Sun YOBA Solar Charge Controller Solar Controller 30A 12V 24V Industrial-grade chips and precision components are adopted for all the controls. Therefore, the controller also can work well in the low or high temperature, as well as humid environment. Also with the use of crystal timing control, which makes the timing function of controller much more reliable. Various protections include over-charge, over-discharge and over-load, as well as unique electron short circuit protection and connection-reverse protection. All the protections are harmless to other components. Comparing with the none PWM charging mode, this one with PWM charging mode is 10%~30% more effected than the none PWM charging mode. Scientific management of battery: as it is overcharged, the battery will get booster tension charge. As a result compulsory maintenance is available for the battery. In normal working state, the direct charge and floating charge are both available, so that the battery life-span is increased. Besides, the adoption of high precision temperature compensation makes the charging more accurate. Double digital LED display, numbers equal to timer setting. With big terminals, big distance between terminals makes it easier to connect the wires.