When you're setting up a 12V system for your 4WD, caravan, or off-grid setup, understanding the different types of sockets and connectors is just as important as choosing the right gear. From powering your phone to connecting your solar panels, the right plug makes all the difference.
Here’s a quick guide to the most common ports and plugs you’re likely to encounter in the 12V world – and what they’re best used for.
USB-A
This is the classic rectangular USB port that’s been around for years. You’ll find USB-A everywhere – from power banks to battery boxes – and it’s perfect for charging phones, cameras, LED lights and other low-draw devices. Just keep in mind: not all USB-A ports are made equal. Older ones may only output 1A, while newer versions can support up to 2.4A for faster charging.
Best for: Phones, GPS devices, cameras, LED lighting.
USB-C
Smaller, faster, and reversible – USB-C is fast becoming the new standard. It can handle much higher power levels than USB-A, and is now commonly found on newer phones, tablets, laptops and even some power stations. In a 12V setup, look for USB-C ports that support Power Delivery (PD) to get the most out of this connector.
Best for: Fast-charging smartphones, laptops, newer tablets.
PD USB Ports (Power Delivery)
USB Power Delivery (PD) is a protocol that allows USB-C ports to deliver a much higher wattage – sometimes up to 100W or more. That means you can charge a laptop or run larger gear straight off your 12V battery system. PD ports intelligently adjust the voltage and current depending on what’s plugged in.
Best for: Charging USB-C laptops, running portable monitors, or juicing up big devices quickly.
Anderson Plugs
Anderson plugs are the workhorses of the 12V world – rugged, reliable, and built to handle high current. They’re a must-have for anyone connecting solar panels, DC-DC chargers, fridges, or heavy-duty appliances. The most common version is the 50A grey Anderson, which is widely used for general 12V applications.
One key thing to know: Anderson plugs are colour-coded and keyed – meaning you can only connect grey to grey, red to red, etc. This prevents mismatched voltage connections. For example:
- Grey plugs are typically used for 12V setups
- Red plugs are often reserved for 24V setups
- Blue, yellow, black and other colours exist for niche or commercial applications
Each colour set is physically incompatible with others, so you can't accidentally plug a 24V device into a 12V system.
There are also Mini Anderson plugs, which are smaller and ideal for lighter-duty applications where space is tight – like powering LED light strips, small solar setups or connecting accessories inside a canopy.
Best for: Connecting solar panels, linking battery boxes, powering high-draw 12V gear, and securing reliable power connections.
Cigarette Sockets
The original 12V socket, these are found in almost every car and are still widely used today. While they're handy and compatible with a wide range of 12V accessories (like fridges, fans and inverters), they’re not ideal for high-draw items or bumpy tracks – because they can rattle loose and don’t always maintain a reliable connection.
Best for: Small devices, low-current appliances, general use.
Merit Sockets
Similar in size to cig sockets but designed for a more secure, vibration-resistant connection. Merit sockets provide a better grip and handle higher currents, making them a popular upgrade for serious tourers and off-grid setups.
Best for: Fridges, air compressors, and other higher-draw gear where reliability matters.
7-Pin and 12-Pin Trailer Plugs
If you’re towing a trailer, camper or caravan, these are essential. The 7-pin flat plug is the most common in Australia, offering basic connections for brake lights, indicators, and a charge feed. The 12-pin version builds on this with five additional pins for running extra gear like reverse cameras, electronic brakes, and even fridge power.
Best for: Towing setups – trailers, caravans, campers.
Final Thoughts
When you’re building a 12V setup, getting the right connector is just as important as the battery or panel you choose. Each port has its purpose – so whether you’re charging your phone, running a fridge, or linking up solar panels, make sure you’re using the best socket for the job.
Still got questions? Drop into one of our retail stores, or give us a call on (07) 3123 4715. Our team of 12V experts will be happy to help.
