In the US at least, and other countries have adopted it, the Anderson power pole is becoming the standard. Anderson power poles are genderless and keyed. In other words, you can connect any similar amp connector to any other, and you can't plug them in wrong (almost). You can put power pole pigtails on all your 12V sources, and power pole pigtails on all your 12V devices, then make any (reasonable) length of extension cable with power poles at either end.
The most common amperages (15, 30, 45) use the same plastic housing, so you can connect a 15A device into a 45A rated power source. The higher amp rated power poles are are 75A, 120A, 175A, and 350A. These are more commonly seen on trucks and commony used to attach things like a winch. I have a set of 175A power poles attached to my Prius to run an inverter, and I have a long set of heavy duty jumper cables that I split near one end put a 175A powerpole set inline (so I can connect my inverter (or my prius) to almost any external source.
It takes a bit of money to get into using them (you need a set of crimpers, and the insertion/extraction tool is a lifesaver here as well). Unless you buy in a lot of bulk, you can expect $1/end you make. If you're in an a club (amateur radio/model trains/rc), someone might be able to lend you a crimp tool or make up some adapters for you. But once you start replacing ends and seeing the usefulness of it, you'll probably want to put ends on everything 12V. I've got pretty much everything 12V of mine switched over, and a handful of adapters to go from power to: alligator clips, ring terminal, bare wire, car DC socket (cigarette lighter), bananna clips, trailer connector.
The most common amperages (15, 30, 45) use the same plastic housing, so you can connect a 15A device into a 45A rated power source. The higher amp rated power poles are are 75A, 120A, 175A, and 350A. These are more commonly seen on trucks and commony used to attach things like a winch. I have a set of 175A power poles attached to my Prius to run an inverter, and I have a long set of heavy duty jumper cables that I split near one end put a 175A powerpole set inline (so I can connect my inverter (or my prius) to almost any external source.
https://powerwerx.com/anderson-powerpole-connectors-15amp-bo... https://en.wikipedia.org/wiki/Anderson_Powerpole#De_facto_st...
It takes a bit of money to get into using them (you need a set of crimpers, and the insertion/extraction tool is a lifesaver here as well). Unless you buy in a lot of bulk, you can expect $1/end you make. If you're in an a club (amateur radio/model trains/rc), someone might be able to lend you a crimp tool or make up some adapters for you. But once you start replacing ends and seeing the usefulness of it, you'll probably want to put ends on everything 12V. I've got pretty much everything 12V of mine switched over, and a handful of adapters to go from power to: alligator clips, ring terminal, bare wire, car DC socket (cigarette lighter), bananna clips, trailer connector.