Sometimes the old family tent just doesn’t cut it anymore. We get it. It’s raining, the tent is leaking and you’re really considering a setup upgrade. Whether upgrading an existing camper or building your own from scratch, a reliable 12V camper trailer setup includes a top-notch dual battery system to ensure you stay charged up to power through every off-grid adventure.
Whether you’re looking to build something fully enclosed, a storage base for your rooftop tent or anything else you can image, there are seven key components to consider when planning a 12V system for your camper trailer build.
Key components of a 12V camper trailer setup
1. 12V camper trailer accessories
To start with, make a list of all the 12V accessories you want to run. This list often includes lights, a 12V fridge and enough power to keep all your devices charged. Once you’ve got this list, figure out the number of amps each item draws, this can be done using the device’s manual or through a Google search.
The next step is estimating the number of hours you’ll be using each item per day. Multiply this by the number of amps to get the amp-hours (Ah) of each item. Add all these Ah together and that’s the smallest sized battery you should choose.
2. Reliable auxiliary batteries
Now you know the capacity of the battery you need for your 12V camper trailer setup. Deciding on the secondary battery chemistry you want is the next step. is the next step. The final decision will depend on where the battery will sit and whether it is exposed to heat or the elements, as well as your budget and charging requirements.
There are two main battery chemistry options, regular deep cycle batteries (including flooded lead-acid, AGM and gel batteries) and lithium batteries (LiFePO4).
Regular batteries, while often more budget friendly, should not be depleted below 50% of their capacity, so a 100Ah battery only has 50Ah of usable power, whereas lithium batteries can be fully depleted, so 100Ah = 100Ah of usable power. Lithium batteries are also much lighter than regular batteries, so if you’re limited by weight lithium could be the better option.
3. A 12V battery charger
Having a secondary battery is good, but you’ll need something to keep it charged. Choosing an auxiliary battery charger often comes down to the level of control you’re after. If you’re after a simple, set and forget solution, the BCDC dual battery charger is the way to go. Able to charge your secondary battery from both your vehicle’s alternator and solar, it’s an easy way to make sure your battery is getting the proper charge.
If you’re after a bit more insight into your battery charge status and power consumption, the Manager30 battery management system is the better option. With a remote monitor screen, you can see your auxiliary battery information and charge status. Able to be charged via the vehicle alternator and solar like the BCDC, it can also be plugged into AC mains power at home or the campsite to keep your batteries topped up while you’re parked.
4. Battery management system screen and app
If you want full control over all your onboard devices including turning lights, inverters, water pumps and fridges on and off, RedVision could be the option for you. Controlled via an in-vehicle mounted display or smartphone app and Bluetooth, you can turn your camper lights or fridge on while sitting around the campfire as well as keep on top of power, temperature and water levels.
5. Inverter for AC power
If you want an AC power option in your camper trailer, a pure sine wave inverter is a must. Pure sine wave inverters change DC power from your batteries into usable AC power to run all your household accessories and chargers. Choosing the right sized inverter for your setup does require a bit of knowledge as far as what devices you will be bringing with you and your existing battery setup but for many people, having an AC power source does make camp more comfortable.
6. Solar for extra power supply
If you’re planning to head off-grid, solar is a great way to put a bit of extra charge back into your batteries. Depending on the specifics of your camper trailer build, there are several different solar options available and choosing the best one is entirely up to you. Essentially it comes down to fixed panels vs folding panels vs solar blankets, or a combination of the three.
7. Portable power
If you’re looking for a more portable power option than a traditional dual battery setup, the GoBlock could be the system for you. Able to be moved in, out and around your camper trailer, it’s a great alternative to a fixed dual battery system if you want to getaway on weekend trips without having to take the trailer. Paired with the PowerDock docking system, the GoBlock can be secured in your vehicle while driving or locked in place while at the campsite for extra security.
GoBlock is a great solution if you’re looking to go off-grid, just charge it before you go, use it for the weekend, and charge it when you get back home. It can also be charged via your vehicle alternator and solar, like a traditional dual battery system. Monitor your charge status via the lights on the GoBlock or the RedVision smartphone app.
Hopefully we’ve helped you get on top of your camper trailer build’s power system, for more information on designing a power system that’s perfect for how you travel check out our guide to building your own REDARC dual battery system.
features music to video of general camper trailer experience, see inverter and great outdoors imagery. Influencer: patriot campers.
Frequently asked questions
How do I power my camper trailer?
A 12V camper trailer system includes four essential components — your 12V accessories like a fridge; power from a 12V battery charger connected to the vehicle battery; and an auxiliary battery/ies. Optional components include an inverter to convert DC to AC power, solar panels as an optional charge source and a portable auxiliary battery that you can move around the campsite.
What does an inverter do in a camper trailer?
An inverter converts the direct current (DC) power from the vehicle power system to alternating current (AC) current required by many appliances or devices used in homes in Australia.
What does the 12V battery run on a camper?
A 12V camper trailer setup includes a battery and powers camper trailer lighting, charges devices like phones or drones, it can power a 12V fridge and any other electrical accessories that make camping more fun.
