Dual Battery Systems & 12V Installation — Gawler & Adelaide

Power That Doesn't Leave You Stranded

A dual battery system adds a second, auxiliary battery to your 4WD, ute or caravan so your fridge, camp lights and device charging run off their own power supply. Your starter battery stays full, and your vehicle starts every time — no matter how long you've been parked up.

This is the heart of what we do at Roam Offroad. We build 12V systems for daily-driven utes, touring 4WDs, canopy fit-outs and full off-grid caravans, using gear from REDARC, Enerdrive and Victron that we stock, install and stand behind.

What We Supply & Fit

• Complete dual battery systems for 4WDs and utes
• Lithium and AGM auxiliary batteries
• DC-DC chargers (REDARC BCDC, Enerdrive, Victron)
• Battery trays, boxes and secure mounting
• Solar panels and solar regulators
• Battery monitors and shunts
• Inverters for 240V power off-grid
• Canopy and tray 12V fit-outs
• Anderson plugs and trailer charging circuits

Lithium or AGM?

AGM batteries are the proven budget option — tough, tolerant and cheaper up front, but heavy, and you can only use around half their rated capacity before you start shortening their life. Lithium batteries cost more up front but are far lighter, deliver most of their rated capacity, charge faster and last more charge cycles.

There's no one right answer — it comes down to how often you're off-grid, what you're running, and your budget. Tell us how you camp and we'll spec the battery that actually suits it.

What a Proper Install Looks Like

Every system we build is properly fused, properly sized and properly labelled — clean cable runs, correct wire gauges, and protection on every circuit. We test the whole system before your vehicle leaves, and you get a setup you can actually understand and maintain on the road.

We install for customers across Gawler, the Barossa Valley and northern Adelaide — from quick under-bonnet second batteries to complete canopy and caravan off-grid fit-outs.

What does a dual battery system actually do?

It separates your loads from your starter battery. The auxiliary battery runs your fridge, lights and charging, and a DC-DC charger keeps it topped up while you drive. Your starter battery is isolated, so no matter how flat you run the auxiliary, the vehicle still starts.

Should I choose lithium or AGM?

Lithium is lighter, gives you more usable capacity and charges faster, but costs more up front. AGM is cheaper and proven, but heavier, and you can only use around half its rated capacity regularly. For serious touring or canopy setups, lithium usually wins; for occasional weekend use, AGM can still make sense.

Do I need a DC-DC charger?

In almost every modern vehicle, yes. Smart alternators vary their output to save fuel and won't properly charge an auxiliary battery on their own. A DC-DC charger delivers the correct multi-stage charge, and it's essential for lithium batteries, which need a specific charging profile.

Can you install a system in my caravan or camper trailer?

Yes — off-grid caravan and camper electrical is one of our specialties. We design and install complete systems with lithium batteries, solar, inverters and monitoring, all customised to how you travel.