This listing includes: 1pcs of MPPT solar charge controller, 40A, 12/24V. Remark: (external display meter MT50 is not included in this package, if you need, please contact us to order separately.) TRUE MPPT!!!! MAX. PV input power: 520W (12V), 1040W (24V) MAX. Input voltage(PV VOC): 100VDC The features are listed below: Advanced maximum power point tracking technology (MPPT) to optimize using the solar system, with efficiency no less than 99.5%.. Ultra-fast tracking speed and guaranteed tracking efficiency. Accurately recognizing and tracking of multiple power points. Reliable automatic limit function of maximum PV input power, ensuring no overload under any circumstance. Wide MPP operating voltage range. 12/24VDC automatically identifying system voltage. LCD panel display design, dynamically displaying tool's operating data and working condition. Multiple load control modes: manual control, light ON/OFF, light On+Timer and test mode. Support 3 charging preprogram options for battery: Sealed, Gel, Flooded. Battery temperature compensation function. Real-time energy statistics function. With RS-485 communication bus interface and Modbus communication protocol, it is available to meet various communication requirements in different situations. (Optional, the cable connection to PC is not included in the package) external display unit (MT50), realizing real-time data checking and parameters setting. (optional) Technical Parameter: Nominal System Voltage: 12VDC/24VDC Auto work Rated Charge Current: 40A Rated Discharge Current: 40A Battery voltage range: 9V~32V Max. Solar Input Voltage: 100VDC Max. PV input power: 520W/12V,1040W/24V Self-consumption: <20mA(12V) <16mA(24V) Temperature compensate coefficien:-3mV/ºC/2V(Default)Communication port: RS485(RJ45 interface) Weight: 1.9kg