Audio & Video Cables & Adapters
Enerpower DC-DC Car Charger 12V-24V Li-Ion to 54.6V (48V Li-Ion) 1.5A XLR-3, DC Bullet Plug for Motorhomes, Boats, Trucks etc. (XLR-3)
DC-DC Charger 12V-24V to 54.6V with 1.5A Output (75 Watt) Quick and small (147 x 60 x 38 mm) With connector: XLR 3, or DC round plug (5.5 mm x 2.1 mm) For use in caravans, trucks etc.
https://www.bizrate.co.uk/audio_videocables_adapters/enerpower-dc-dc-car-charger-12v-24v-oid37501725905.html