Anderson Plugs for DIY
I mentioned them in another thread but thought you might be interested in Anderson plugs if you are not familiar with them. If you have a car, camper or caravan and you need to connect solar, fridges or any 12/24v DC appliance then these are ideal.
As you can see it is impossible to connect them the wrong way round. As I said they are ideal for connecting solar panels, fridges etc or anything than carries a few amps because they make a much better connection.
Personally if I can take the wires into my garage then I use solder (and a gas flame) to connect the wire to the connector but if it has to be done in situ (say, under the bonnet) I use a crimping tool.
There are plenty of Chinese copies which seem as good as the actual brand name connectors for a fraction of the price; I usually buy them in packs of 10.
The only thing you have to be aware of is that the different colours do not fit each other. I just stick with the grey ones.
If you do need to connect DC power in your car/caravan then these are far superior to the normal cigarette lighter socket. They end up being cheaper than a cigarette lighter plug, they make a really good connection, can't vibrate loose and it is impossible to connect them the wrong way round.
BTW When I changed the cigarette lighter plug on my fridge I just cut the wire a little away from the cigarette lighter plug and put an Anderson plug on both ends of the cut wire so that I could still use the fridge in a car which only had a cigarette lighter socket.