Check the listing for details. 30A Solar Panel Battery Charge Controller 12V/24V LCD Regulator Auto Dual USB US. Condition: New. Listed at 9.45 USD. Characteristics: 1. Build-in industrial microcontroller. 2. One-key configuration, digital display, automatic memory function. 3. Fully pwm-load management load. 4. Build-in short circuit protection, open circuit protection, reverse protection, over load protection 5. Dual mosfet Reverse current protection, low heat productions. Connection of the system: 1. Connect the battery to the charge controller plus and minus. 1 will be displayed, in case of detecting 12 V battery, 2 in case of detecting 24 V battery. 2. Connect the photovoltaic module to the plus and minus regulator. 3. Connect to the consumer for the charge controller plus and minus.the reverse order applies when uninstalling! An incorrect sequence order can damage the controller! Package List: 1 x Solar Battery Controller.