Wiring: OUTPUT+ to LOAD+, OUTPUT- to LOAD-; INPUT+ to BAT+, INPUT- to BAT- Note: * Never connect to solar panel, PWM/MPPT charge controller, inverter or wind turbine. * Never use for charge. Keep good air convection. * Never reverse the polarity. * Use the enough big cable to avoid the voltage drop. Specifications: Input Voltage Range: 40V-90V DC Output Voltage: DC13.8V 20A Output Rated Power: 276W Efficiency: 97% (half load); 95% (full load) Ripple: 200mVp Line Regulation: 0.2% Load Regulation: 0.2% Voltage Accuracy: 1.5% Enclosures: IP68 Case Operating Temperature: -4085C Weight: 675g Features: 1. 100% full power and stable current output, non-isolated module. 2. Industry grade DC 40V-90 to DC 13.8V step down/up converter, efficiency up to 95%. 3. Die-cast aluminum shell, epoxy potting, cooling by free air convection; Waterproof level IP68 and anti-shock protection. 4. Protections: Over-current, Over-voltage, Over-temperature, Over-load and Short-circuit, auto-recovery when device is back to normal operating. 5. Certificates: CE/RoHS, 1 year warranty, lifetime up to 100,000 hours. Package included: 1 x DC 40V/90V to13.8V 10A Converter