SOLAR PANEL CONTROLLER: This solar panel battery charge controller utilizes advanced Maximum Power Point Tracking (MPPT / PWM) technology, offering ultra-high efficiency with a maximum conversion efficiency of 98%.LARGE LCD SCREEN: The large LCD screen accurately displays charging and discharging current. It features MPPT auto-focus charging with high charging efficiency and dual-direction focus tracking that doesn't interrupt the charging process.MULTI-FUNCTION: With this solar panel battery charge controller, you can view accumulated power generation and discharge power, adjust charging and discharging parameters, and utilize functions like light control, delay control, and power-off memory.SAFETY: Built-in protection includes overheat protection, overcurrent protection, short-circuit protection, open-circuit protection, troubleshooting, and automatic controller reset. The maximum current is 2.5A. Equipped with all necessary protective devices, system control parameters are adjustable for easy setup and use.NOTES: 1. The charge controller is suitable for lead-acid batteries: OPEN, AGM, GEL, Nickel-Hydride, Lithium, Lithium-ion batteries, or other batteries. 2. The controller can only use solar panels as a charging source. Do not use DC or other power sources as a charging source. 3. After repeated cycles, the capacity of an old battery may decrease and easily fall below 8V, causing the controller to shut down (the LCD screen will completely turn off).