This MPPT step-down real-time tracking solar battery recharging controller with the LED display, and the output voltage can be adjusted, and suitable for le-ad-acid, lithium-ion and other batteries in line with 10~30V recharging voltage. Come on and try it, it will not let you down. Features: With the LED display to show the input and output current and voltage, you can see the data more clearly. The output voltage can be adjust between 10~30V, you can choose the suitable for your needs. Suitabe for the le-ad-acid, lithium-ion and other batteries in line with 10~30V recharging voltage. Efficient MPPT real-time tracking function, give you a better using experience. Overheat pro-tection function: When the internal ambient temperature of the MPPT controller exceeds 100℃, the output power of the MPPT controller will be reduced. If the internal ambient temperature continues to rise to 110℃, the output of the MPPT controller will be automatically turned off. When the internal ambient temperature of the MPPT controller falls below 85℃, the MPPT controller will automatically resume operation. Short circuit pro-tection function: when the MPPT controller output comes unexpected short circuit, MPPT controller will automatically close the output, the short circuit will automatically return to normal after elimination. Input under-voltage pro-tection: when the MPPT controller input direct current voltage is lower than 15V, MPPT will protective shutdown, the input voltage is normal automatically resume work. Specifications: Material: aluminum Suitable for: the battery of recharging voltage between 10~30V Suitable solar panel: The open circuit voltage: 18V~55V Maximum power voltage: 17V~55V Output power: 200W, 300W, 400W (optional) Photovoltaic input starting voltage: 18V~55V Photovoltaic input tracking voltage: 17V~55V Output to the battery voltage: 10~30V (adjustable) Output to the battery current: Max.25A No-load loss: 0.35w The pi-tch of the installation: 110mm * 70mm Installation hole diameter: 5mm Voltage adjustment rate: 1% Load adjustment rate: 1% PWM conversion efficiency: 97% MPPT efficiency: 99% Working temperature: -40℃~65℃ Install line length: 50mm Item size: 130 * 80 * 40mm / 5.1 * 3.1 * 1.6in Item weight: 450g / 1.0lb Package size: 160 * 90 * 50mm / 6.3 * 3.5 * 2.0in Package weight: 500g / 1.1lb Packing list: 1 * Solar Recharge Controller (Optional)