Daygreen 24V to 12V 20A 240W Power Buck Module Car Step Down DC DC Converter Voltage Regulator Reducer, Non-Isolated

Wiring: INPUT+ to BAT+, INPUT- to BAT-, OUTPUT+ to LOAD+, OUTPUT- to LOAD- Reminder: Never reverse the polarity. Use the enough big cable to avoid the voltage drop. Never connect to solar panel or wind turbine. Never charge the battery. Daygreen P/N: B20-24-12 Efficiency: 95% Input Voltage: 21-35VDC Output Voltage: 12VDC Output Current: 20A Ripple: 200mVp Line Regulation: ±0.2% Load Regulation: ±0.2% Voltage Accuracy: ±1.5% Enclosures: IP68 Dimension: 74*74*31mm Net Weight: 0.26kg Case Operating Temperature: -40~85°C Certificates: CE Rohs Warranty: 1 year MTBF: 100,000 hours Application: 24V DC battery of vehicles as input power to 12VDC appliances as output load. Questions How to choose the correct current for loads? For example, if the max current of your load device is 10A, then choose 10A/0.7=14.28A at least for resistive loads according to international standard. If the load device is motor or compressor, then you may choose 10A/0.5=20A according to real testing result since the motor and compressor starting current may be 2-3 times than nominal current.