Feature: 1. 3‑stage PWM charge management, improve system efficiency and prolong the life span of the battery. 2. Solar controller has short-circuit protection, open-circuit protection,reverse protection, over-load protection. 3. LCD display that can clearly indicate the status and data, it can be conveniently switched modes and parameter configuration. 4. Two‑way MOS tube anti‑backflow circuit, high‑power charging mode, ultra‑low heat. 5. Charging 12V/24V battery, ultra‑wide charge and discharge adjustable, 12V is suitable for 18V solar panels, 24V is suitable for 36V solar panels. Specification: Item Type: Solar Charge Controller Material: PVC Color: As shown in the picture Product Size: Approx. 13.3x6.8x3cm / 5.2x2.7x1.2in Weight: Approx. 145g / 5.1oz Rated Voltage: 12V 24V automatic (12V is suitable for 18V solar panels, 24V is suitable for 36V solar panels) Rated Current: 20A Charging Mode: 3 stages Function: Charge 12V/24V battery, ultra-wide charge and discharge adjustable Self-Consumption: <10MA Overcharge Protection: 14.4V/28.8V Floating Voltage: 13.7V/27.4V Over Discharge Protection: 10.7V/21.4V Over Discharge Recovery: 12.6V/25.2V Maximum Input Power: 240w (12v) 480w (24v) . Package List: 1 x Solar Charge Controller1 x Instruction Manual Note: 1. Please allow 1‑2in error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.3. Without electric power storage function.