Feature: 1. HIGH EFFICIENCY: Tracking efficiency ≥99.5%, maximum conversion efficiency is 98%, with 12V 24V automatic working system voltage identification, automatic saving function. Two voltage disconnection levels, has charging power and current limiting function 2. PROTECTION FUNCTIONS: Built in reverse polarity, overcharge, overdischarge, overload, short circuit and reverse current protection. Protect the battery from being overcharged by the solar module and overdischarged by the load 3. OPTIMIZED BATTERY LIFE: The 20A solar charge controller charging process is optimized to extend battery life and improve system performance. Includes 4 stage battery charging (batch, boost, float and equalization) and temperature compensation 4. SUPPORT BATTERY: Support sealed battery(default), or gel, AGM, Flooded user (9～17V at 12V; 18～34V at 24V), lithium battery for LiFePO4 (4s/12V; 8s/24V), Li(NiCoMn)O2 (3s/12V; 6s/24V). With battery temperature compensation function (only for acid batteries), overheating power reduction function 5. TEMPERATURE COMPENSATION FUNCTION: With RS‑485 communication bus interface and communication protocol, detailed parameter settings are set by accessories such as MT50, for eBox‑WiFi‑01, for eBox‑BLE‑01, for elog01, and PC software Specification: Item Type: MPPT Solar Charge Controller Uses: Can buck high voltage solar arrays and charge low voltage battery packs. Widely used in RVs, communication base stations, household systems and field monitoring and other fields. System Rated Voltage: 12V 24V Rated Charge Current: 20A Rated Discharge Current: 20A Rated Charge Power: 260W (12V); 520W (24V) Maximum PV Array Power: 390W (12V); 780W (24V) Maximum PV Opencircuit Voltage: 92V (25℃); 100V (minimum operating temperature) Self Consumption: ≤12mA Discharge Circuit Voltage Drop: ≤0.23V Temperature Compensate Coefficient: -3mV/℃/2V (default) Grounding: Negative ground RS 485 Interface: 5VDC 100mA LCD Backlight Time: 60s (default) Working Environment Temperature: -25℃~+50℃ (full load operation) Storage Temperature Range: -20℃~+70℃ Relative Humidity: 95%, N.C. Enclosure: IP30 Recommended Cable Diameter: 6AWG (16mm²) Remote Temperature Sensor (TS-R): Cable Length: Approx. 3meter / 9.84ft Connector: 0.0125ft /2P Test Temperature: -131℉~257℉ If the controller is not connected to TS-R, the battery charge and discharge temperature is set to 25℃ by default without temperature compensation RS485-150U Cable: This cable is used to monitor each controller on the network and update the firmware using the Solar Station PC software. Package List: 1 x Solar Controller1 x Solar Controller User Manual1 x Solar Controller Accessories1 x Temperature Probe1 x Host Computer Connection Line1 x Remote Control Meter 1 x Remote Control Meter User Manual1 x Remote Control Meter Connection Line8 x Screw4 x Screw Cover4 x Rubber Pad Note: 1. Connect the system in order, battery‑load‑PV array, and disconnect the system in reverse order 3. 2. 1.2. Never connect the solar panel array to the controller without batteries. The battery must be connected first 3. Do not connect any inverter, wind, alternator or charger to the charge controller 4. If the remote temperature sensor is not connected to the controller, the battery charge or discharge temperature defaults to 25℃ without temperature compensation.5. The wire diameter is for reference only. If the distance between the PV array and the controller or the controller and the battery is long, larger wires can be used to reduce the voltage drop and improve performance.