Your Caravan Electrical System Simply Explained
Modern caravans have some amazing systems and devices which make “camping” pretty comfortable. Most of these devices require power, usually either 12V or 240V. But have you ever thought of how they get their power, so you can have that little bit of luxury while you are camping?
We travel for months at a time, and our electrical system is one of the most important parts of our caravan as we work online. Our system powers laptops, Starlink, cameras, and recharges the kids’ iPads!
This guide is an overview of a typical caravan electrical system. If the world of caravanning is new to you, or if you would like to learn more about your caravan’s electrical system, have a look below.
Let’s look at a typical caravan’s electrical system.
Our Fav Caravan Resources
– For all your caravan electrical needs, check out My Generator
– For Bluetti systems, click here
Overview of your Caravan’s Electrical System
You can split a caravan electrical system into two: 240V and 12V. They are separate systems, but can be connected; we’ll discuss each shortly.
Electrical systems can also include:
- Batteries
- Battery management system
- Inverter
- Solar panels
The 240V part of the Caravan electrical system
The 240V system will provide power to certain appliances throughout the caravan. Most appliances will be plugged into a 240V GPO (power plug socket) just like you see in your home. You can power practically any 10A device like you would at home, eg. Kettle, coffee machine, bread maker, computer, Starlink or anything else you bring with you. To get power to the GPOs you will need to have a source of 240V power.
Where do you get your 240V power from?
Power can be provided from the caravan park, if you are staying there, or from your power generator if you are camping off-grid.
You will need a 15A power source, which all caravan parks and most generators provide, and a 15A extension cord. Simply connect your extension cord from your power source to the caravan’s 15A power inlet, switch it on, and you are good to go.
After you plug into 240V power:
All your 240V GPOs throughout your caravan are now live. The system will have circuit breakers for protection, just like your home, so if you don’t have power, check these. Now, when you first switch the system on, make sure you check any devices which automatically turn on, eg. Hot water service and fridge. Now you can enjoy all your little electrically powered luxuries throughout your caravan, whenever you like.
The 12V part of the caravan electrical system
Now for the 12V system. Power is provided from on-board 12V batteries. Usually, the 12v system will power lights, water pump, fridge (which can be 12v, 240v or gas), USB or cigi outlets, diesel heater and 240v power inverter.
The amount of power you have available will depend on how many batteries and/or the size of batteries you have on board. These are measured in amp hours (Ah), and the higher the number, the longer your batteries will last.
How the batteries can be recharged:
Like all batteries, they will need to be recharged as you use the available power. This will usually be done in 3 ways: from your tow vehicle, solar panels or 240V charger. Some vans will have a “smart charger” management system, which will automatically control the recharging of your batteries, while some vans will have separate systems that need to be controlled manually.
Solar panels
For the solar part of this system, most vans will have solar panels fixed to the roof and will always be charging your batteries (as long as you have sunlight on the panels). For this part of the system, you usually don’t need to do anything; just let it do its thing.
Some systems will allow you to plug in an auxiliary solar blanket to increase your charging power.
Check out this solar blanket, which gives you an extra 200W of charging power.
Note: Check with an auto electrician for more information if you want to add another fixed panel, as the current law states you need to have a circuit breaker on each panel.
Our Tip: If your caravan doesn’t have a battery management system on board and you want to plug in a solar blanket, you may also need to purchase a solar regulator. Most newer caravans will have some sort of battery management system, but check first if you’re not sure.
Tow vehicle
Your tow vehicle will also provide 12V power to charge your batteries. This is usually done as soon as you connect either the 7-pin / 12-pin socket or the Anderson plug connection from your car to the caravan, and start your car.
Depending on how your car is “wired up”, your car may provide power to the caravan even when the car is turned off. If this is the case, be mindful that if you leave the caravan connected for a while without your engine running, you may flatten your car’s battery.
240V charging
For the 240V part of the charging system, most caravans will have a 240V powered battery charger on board, which can be either integrated within a “smart charger” management system or as a separate unit. Once the external 240V power source has been connected to the caravan, the batteries will start charging.
Some systems will allow both solar charging and 240V charging at the same time. Some management systems have some pretty fancy displays to let you know what is happening with your 12V electrical system.
Some of the information provided is how much power is in your batteries, the source of charging ie, solar, 240v or vehicle, how much power your solar panels are producing and how much power is being consumed. This information can be quite handy to manage your power consumption while off-grid.
Connecting 240V and 12V systems together
Now, for when the two systems can be connected.
Some caravans have 240V power inverters, which will provide 240V power from your on-board 12V batteries. This system comes in very handy, especially when off-grid and you don’t have an external 240V power source available.
Need an inverter to make power simple? Check out the range here
The inverter can be either connected to the GPOs throughout the caravan, connected to dedicated GPOs (these will usually be labelled) or stand-alone, which requires devices plugged directly into the inverter.
If the inverter is connected to the GPOs throughout the van, the system will usually automatically switch between 12V supply and an external 240V supply whenever the 240V supply is turned on or off.
If the inverter is connected to dedicated GPOs, you will only have off-grid 240V power from those GPOs. If your inverter is stand-alone and not connected to any GPO, you will need to locate the inverter and plug your device directly to it.
As you can see, the intergraded system can be more convenient, but this also allows you to plug many devices in at the same time, which could overload your system or flatten your batteries very quickly.
Keeping on top of checks like these doesn’t have to be complicated. Our caravan maintenance schedule covers your electrical checks too, along with everything else worth looking at each season.
Our Thoughts
Take the time to get to know what set-up you have or what set-up you would like fitted to your van. Find out what devices are permanently plugged in and what will automatically turn on when a power source is turned on.
Look at your device’s power usage to make sure you don’t overload your system’s capabilities.
