Features: The solar controller has household type and street lamp type in the design of an organic whole. The solar controller has 12V, 24V auto identification of the design. The solar controller has light control and time control (street lamp type). The solar controller has the overcharge, discharge, over current, short circuit, answer back and protective measures. The solar controller has the power-down protection, it means the controller can auto save the parameters we set before when there no power. With the Strong charging and equilibrium charging, floating three-step PWM control charging ways. CE and RoHS certificated to offer safer and reliable use. Note:if the 24V battery loss bad, voltage is less than 17V, connected to the controller may recognition for 12V system. (such as the discovery of battery under-voltage, controller still output normal, need to change battery).