Usage Tips:This battery recharging controller can be used with solar panels( the solar panel is NOT included) to recharge most kinds of common batteries such as le-ad acid batteries, lithium batteries, lithium iron batteries. The output voltage can be adjusted between 24~85V, with multiple protections functions, and try it, it will not let you down. Features: With the LED display to see the input and output voltage and current, you can check it . The output voltage can be adjusted between 24~85V. Overheating protections function: When the internal temperature of the MPPT controller exceeds 100C, the MPPT controller will reduce the output power. If the internal temperature continues to rise to 110C, the MPPT controller will automatically turn off the output. When the internal temperature of the MPPT controller is lower than 85C, the MPPT controller will automatically resume work. Short circuit protections function: When an accidental short circuit occurs in the output of the MPPT controller, the MPPT controller automatically turns off the output, and automatically returns to normal after the short circuit is eliminated. Input undervoltage protections function: When the input direct current voltage of the MPPT controller is lower than 15V, the MPPT will shut down protectively and automatically resume work after the input voltage is normal. It has a high efficiency MPPT real-time tracking function and a high-efficiency synchronous rectification solution. It also has the IP66 waterproof and dustproof grade. Specifications: Material: aluminum Color: as shown Photovoltaic input power: 400W Suitable photovoltaic panel: Open circuit voltage: 18~55V Maximum power voltage: 17~55V Photovoltaic input starting voltage: 18~55V Photovoltaic input tracking voltage: 17V~55V output to the battery voltage: 24~85V (adjustable) No-load loss: 0.35W 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: 120 x 80 x 40mm / 4.7 x 3.1 x 1.6in Item weight: 450g / 1.0lb Package Contents: 1 x Battery Recharging Controller (Tag Random Do not accept designation) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.