The standard power connectors for Ham Radio operators is the Anderson Powerpole.
In this video you can see how to connect your cable to the powerpole.
The Powerpole connector has been adopted by many segments of the Amateur Radio (Ham Radio) community as their standard 12-volt DC power connector for everything from radios to DC power sources to accessories. Three notable groups are the Amateur Radio Emergency Service (ARES), the Radio Amateur Civil Emergency Service (RACES) and the Wireless Institute Civil Emergency Network (WICEN). Standardization allows equipment owned by different hams to be used together without needing adapters in emergencies, at public service events, at field day, during contests, when borrowing equipment, etc.
In the Netherlands it’s used by Dares as an standardization,
There is also an Wikipedia site about the powerpole here
Radio amateurs using the 30A powerpole with the cables named “14GA” or “12GA”