Compact MPPT Solar Charge Controller for 12 V and 24 V Systems Why this controller matters Protects batteries and loads by managing charge and discharge automatically. It prevents overcharging, overdischarging, reverse connection, and short circuits while improving charging efficiency with MPPT control. Easy to use and configure with automatic 12 V and 24 V identification, a clear LCD display, and a twobutton human machine interface. Suitable for offgrid power systems, RVs, boats, cabins, remote sensors, and other DC power applications where reliable battery management is required. Key specifications Current options: 30 A, 50 A, 70 A (select model) Rated voltage: 12 V or 24 V automatic identification USB output: two ports, 2.4 A each Overcharge voltage: 13.7 V for 12 V systems, 27.4 V for 24 V systems Overdischarge voltage: 10.5 to 11.0 V for 12 V systems, 21.0 to 22.0 V for 24 V systems Temperature compensation: minus 3 mV per degree C per cell Quiescent current: less than 45 mA Loop voltage drop: less than 200 mV Display: LCD Load type: MPPT Waterproof rating: IP32 Material: plastic Color: black and orange Size: 30 A: 17.5 x 14 x 4.0 cm (6.9 x 5.5 x 1.6 inches) 50 A: 21.0 x 19.3 x 5.5 cm (8.3 x 7.6 x 2.2 inches) 70 A: 22.9 x 20.0 x 5.5 cm (9.0 x 7.9 x 2.2 inches) Package weight range: 480 g to 1280 g depending on model Core functions and protections MPPT load control for higher conversion efficiency and better battery charging compared to PWM systems. Automatic recording of total system operating hours, error time tracking, and full charging time logging. Protections include overload protection, surge and lightning protection, undervoltage disconnect, reverse polarity protection, and short circuit protection. Reverse connection protection uses a negative MOSFET in the series control circuit to protect the system if connections are reversed. Precise temperature compensation and automatic adjustment of charging and discharging voltages to extend battery life and optimize performance. Discharge capacity control to manage battery depth of discharge. User interface and configuration LCD display provides system status and configuration information. Twobutton interface for humanmachine interaction and configuration. Full technical data available through the interface for configuration and modification. Instruction to set float voltage to 13.7 V if required: 1. Press and hold the MCU control button for about 3 to 4 seconds to open the administration interface. 2. Use the Add button on the screen until the voltage reaches 13.7 V. 3. Press the MCU control button again to save settings when the screen stops blinking. Package contents 1 x solar charge controller 1 x user manual Notes and operational behavior The controller protects against excessive voltage and overcurrent. If battery voltage falls too low, the controller will stop output to protect the battery. Once the solar panel recharges the battery to the recovery voltage, normal output resumes. Recovery voltage after lowvoltage cutout: 12.6 V for 12 V systems. Normal operating voltage range can be set manually between about 10.7 V and 13.7 V for 12 V systems, with corresponding double values for 24 V systems. Typical use scenarios Offgrid cabin or small cottage: Manage a battery bank and solar array to power lights, fans, and small appliances while protecting battery life. Recreational vehicle or boat: Charge and maintain house batteries from roofmounted solar panels and provide USB charging for devices. Remote monitoring station or telecom equipment: Provide stable DC power with protection features and low idle current for longer unattended operation. This controller is a practical, configurable solution for managing 12 V and 24 V solar battery systems, combining MPPT charging, essential protections, and a userfriendly interface for reliable, efficient battery management.