is_customized:Yes Output Current:20A Output Frequency:100KHZ Weight:650g/1600g Size:Different Output Type:single Output Power:401 - 500w Model Number:Different Type:DC/DC Converters Origin:Mainland China Certification:CE,RoHS Application:12V vehicles Line regulation:±0.2% Load regulation:±0.2% Voltage accuracy:±1.5% Temperature coefficient:±0.03%/°C Cooling:free air convection Enclosures:IP68 Warranty:3 years Charger 12V to 24V DC DC 10A-20A  Step Up Converter For  28V Lead Acid Battery and 29.2V Lipo Auxiliary Battery Product Description Wide input voltage from 11 to 16V for converter For 12V vehicle: start operating at 13.5v and switch off at 12.5 volts For our charger require a 13.5V wakeup volts to start the charger. 100% full rated power 100% full stable output current 100% burn-in test High-efficiency up to 94% Waterproof sealed Cooling by free air convection Surface mountable 3 years warranty Over-current, over-voltage protections Over-temperature, shutdown, short-circuit, reverse polarity protections According to: EN 50498:2010 IP68 The 28V output model can charge 24V auxiliary battery. INSTALLATION STEPS FOUR TERMINAL WIRING: Input + to Battery +, Input- to Battery-. Output + to Load +, Output- to  Load -. FIVE TERMINAL WIRING: "ACC" is switch that means: can power some load in the car without starting the car. ACC to Switch/Ignition Input + to Battery +, Input- to Battery-. Output + to Load +, Output- to  Load-. If no need the ACC function, then use clamp insert ACC and INPUT+ kangwobei case is Oxidation Resistant Coatings to avoid rust. The counterfeit from others is no oxidation-resistant .