Cocar 12T12-4A Car DC 12V 4A Voltage Stabilizer Surge Protector Power Supply Regulator for Auto Truck Vehicle Boat Solar System etc.(DC10-36V Input, DC12V Output): Amazon.co.uk: Electronics & Photo
interVOLT 12V DC Stabilizer / Voltage Regulator / Power Conditioner / Battery Charger (10-16 VDC Input - 12.5/13.6 VDC Output) - Heavy Duty 7A DC- DC Isolated - Model SPCi121207: Amazon.co.uk: Electronics & Photo
Volt Stabilizing Converters - GFS Power
Newmar NP-12 NAV-PAC - DC Power Conditioner, Mobile UPS 12V backup | Powerwerx
Amelec Australia | Isolated Switchmode Power Conditioner GEN II Maxi 12-12 VDC 20Amps