This Solar Battery Charge Controller automatically manages and regulates the voltage and current to the battery from the solar panel(s). It incorporates short-circuit open-circuit reverse polarity and overload protection in order to ensure that the batteries are not overcharged and that power isn t discharged from the batteries to the solar panels during shaded or dark conditions and drain the batteries. It comes with USB ports to charge for your phone and other electronic devices directly from the controller. This solar charge controller is perfect for smaller home cabin RV and other remote and portable solar systems. Features This controller is designed for use only with 12V and 24V lead-acid batteries. It cannot be used with lithium-ion nickel-cadmium or other battery types. Regulates the voltage from the solar panels going to the batteries. Built-in industrial master chip to control the charge and discharge process with adjustable parameters to prolong the battery life cycle and stabilize power to the load. 3-stage PWM charge management with short-circuit protection open-circuit protection and reverse polarity protection. Dual USB outputs with 5V/2A maximum power (across both outputs) can charge mobile phones tablets and other USB-powered devices. LCD display with backlight function displays status and parameters. Dual MOSFET reverse current protection low power dissipation. Easy to install and operate suitable for home industrial commercial remote and portable solar energy systems. Specifications Size: Approx.13.3 x 7 x 3.5 cm/ 5.24 x 2.76 x 1.38 inch (LxWxH) Battery Voltage: 12V/ 24V (Auto recognition) Input Charging Current: 10A / 20A / 30A dependent upon the model chosen. The maximum panel output current should be about 25% less than the controller s maximum input current rating. For example with a single 6A 100W panel use the 10A model. Two 6A panels (12A total) should use the 20A model. If in doubt use the higher current model i.e. if the maximum panel output current is 9A use the 20A model rather than the 10A model Maximum Discharge Current: 10A Internal power consumption: =10mA Over Charge Protection: B01 Sealed: 14.4V/28.8V B02 Gel: 14.2V/28.4V B03 Flood: 14.6V/29.2V Over Charge Float: 13.7V/27.4V Charge Recovery Voltage: 12.6V/25.2V Over-discharge Protection: 10.7V/21.4V Over-discharge Recovery: 12.6V/25.2V USB output: 5V/2A 12V batteries should be used with solar panels capable of generating 18V-25V With 12V batteries the maximum panel voltage must not exceed 25V 24V batteries should be used with solar panels capable of generating 36V-50V With 24V batteries the maximum panel voltage must not exceed 50V Maximum Power Output: 10A (12V / 120W (MAX) 24V / 240W (MAX) ) 20A (12V / 240W (MAX) 24V / 480W (MAX) ) 30A (12 V / 360W (MAX) 24V / 720W (MAX) ) Operating Temperature: -35 ~ +60C Storage Temperature: -35 ~ +60C Package Includes: 1X (1 Piece) 10A 20A or 30A PWM Solar Charge Controller - Black Case Operating Instructions