12V to 19V 20A 385W DC-DC Step Up Power Converter. Output Power: 385W. Output Current: 20A. WaterProof 12V/24V to 5V 10A 50W Step Down DC/DC Power Converter Regulator UK. 1x Converter Regulator. 4: Ultra-thin and compact size, easy to install and convenient to carry around.
eBay