Custom 4WD Dual Battery Systems
– Caloundra & Aura
Professionally engineered off-grid 12V layouts built for relentless reliability on corrugated tracks
Never let a flat battery ruin your weekend at Double Island Point, or leave you powerless on a beach escape to K’gari (Fraser Island).
When you’re off-grid, you need absolute confidence in your 12V fridges, camp lighting, induction cooktops, and custom canopies.
At Murty’s Auto & EV Centre, we design and install custom-engineered auxiliary power layouts for outdoor adventure lovers, weekend tourers, and long-haul lap-of-Australia rigs.
⚡ Premium 12V Hardware
Cheap universal power boxes are a recipe for disaster. Shane Murty will custom-design your dual-battery system, configuring it specifically to your vehicle’s space and power requirements. You and your family can count on world-class charging technology:
đź”´ REDARC Australian-Built Toughness
Engineered to withstand the extreme heat and harsh vibrations of remote Australian tracks. We source, mount, and calibrate dual-input REDARC DC-to-DC chargers featuring built-in MPPT solar regulation that charges auxiliary batteries via the alternator while you drive. REDARC also offers The Manager30, a sophisticated battery management system that integrates AC power, DC vehicle charging, solar inputs, and remote battery state-of-health monitoring.
🔵 Victron Energy Smart Eco-Systems
Victron is the global standard in high-end, custom canopy electrical builds, providing precision, modular expandability, and real-time app integration. Popular products include Victron’s next-generation non-isolated DC-DC Orion XS chargers that operate at an incredible 98.5% efficiency. These guys deliver full power even in heat extremes without aggressive thermal derating. With a Victron SmartShunt Monitor and the VictronConnect App, you’ll be able to stream live data directly to your smartphone, including state of charge, time-to-go, and historical flow.
We use premium components to configure setups that build separate, isolated electrical loops that conform with strict factory standards.
🛠️ Choose Your Power Profile
Fast Weekend Escape
(Intelligent
DC-to-DC Chargers)
Perfect for family getaways. We install and calibrate intelligent REDARC, Projecta, and Victron dual input systems to ensure that your auxiliary battery charges rapidly from your alternator. This switches smoothly to solar input the moment you set up camp.
Extended Off-Grid Setup
(Lithium & AGM Optimisation)
Stay out there longer with an AGM battery mounted securely under the bonnet, or tuck a slimline Lithium (LiFePO4) layout behind the rear seat of your dual-cab ute or canopy to run high-draw appliances, such as induction cooktops, coffee machines, and 12V fridges, for days.
Total Campsite Convenience
(Complete 12V
Auxiliary Wiring)
Everything everywhere you need it. Heavy-gauge fused distribution blocks, secure Anderson plugs for your camper trailer or caravan towing, dedicated USB ports for all your devices, and bright, insect-defeating internal canopy lighting configurations.
The bar graph below gives you a quick overview comparing Lithium and AGM batteries:
📦 Custom VIN-Matched Sourcing & Premium Brands
Murty’s is not a fan of locking customers into single-brand pipelines and mass-market compromises. Instead, we focus on exact-fit performance parameters then provide each vehicle with custom-procured components.
- Tailored Battery Sourcing: By hand-selecting and ordering premium deep-cycle batteries matched to customer needs, we avoid stockpiling decaying inventory. Based strictly on what fits your rig best, we source and build around industry-leading, high-grade Australian-backed lithium systems including Custom Lithium, Enerdrive, or Revolution Eco.
- Freshly Sourced Items Only: This means your build is guaranteed to benefit from the latest firmware, updated casing parameters, and maximum warranty protection.
đź“Š Deep-Dive: REDARC vs. Victron Energy
When you’re planning a complete 12V build, selecting the main power management system is a serious investment decision. Let’s look over the unique engineering strengths of REDARC and Victron for different style setups:
REDARC
| Manufacturing Background REDARC is designed, tested, and manufactured in Australia, to be ready, willing and able to withstand outback corrugations and intense dust. |
| System Philosphy All-in-one centralised consoles (e.g. The Manager30) that elegantly handle multiple inputs through one brain. |
| Interface Style Rugged physical monitoring displays and durable toggle controllers built for demanding dashboard placements. |
| Ideal Installation Path Ideal for under-bonnet dual battery placements or clean, simplified tray environments requiring unyielding structural protection. |
Victron Energy
| Manufacturing Background Netherlands engineered, globally proven in commercial marine, residential solar, and premium touring environments. |
| System Philosphy Modular components connected via smart networks, letting you scale and expand elements as you go. |
| Interface Style Comprehensive, real-time wireless metrics sent to your device via the highly stable VictronConnect Bluetooth App. |
| Ideal Installation Path The ultimate layout framework for intricate custom canopy false walls, camper configurations, and high-draw inversion needs. |
💡 Why Caloundra Chooses Murty’s for 4WD Dual Battery Systems
Local, Reliable Backing
Located in the Caloundra West industrial estate, we provide an authentic local warranty for drivers across Caloundra, Aura, Baringa, Nirimba, Bells Creek, Pelican Waters, Golden Beach, Aroona, Kings Beach, and Little Mountain.
Smart Alternator Programming
Modern 4WDs rely on variable-voltage smart alternators to lower emissions. Cheap fitters install basic solenoid isolators that leave your auxiliary battery perpetually half-empty. Shane Murty programs precise high-amp charging profiles ensuring your setup charges cleanly to 100% capacity.
Safeguarding New Car Warranties
When a less qualified installers cut or splice into a modern 4Ă—4 computer harness, your factory electronics can be easily compromised. We build entirely separate, safely fused loops that safeguard your sensitive engine control modules and keep your new car warranty 100% intact.
Custom 4WD Dual Battery Setup: Frequently Asked Questions
Lithium batteries offer superior performance, while AGM batteries suit tight budgets or engine-bay placement. Lithium (LiFePO4) batteries are up to 60% lighter, can be safely discharged down to 5-10% without damage, and charge up to 4 times faster than AGM. However, lithium batteries generally cannot handle the extreme heat of an under-bonnet engine bay. If you need a secondary battery mounted under the hood of your 4WD, a heat-tolerant, fully sealed AGM battery remains the safest choice. For in-cab, canopy, or rear drawer setups, lithium delivers far greater long-term value and deep-cycle lifespan.
No, installing an aftermarket dual battery system does not void your vehicle’s factory warranty. Under Australian Consumer Law, you have the right to fit high-quality accessories to your vehicle. Engage a certified auto-electrical and high-voltage technician, such as Shane Murty, who specialises in designing and isolating 12V circuits and who insists on premium smart DC-to-DC chargers and circuit breakers. Doing this will completely isolate and protect your vehicle’s original electrical loom, computer modules, and starter battery. Your factory warranty will remain 100% intact.
Newer 4WDs will not fully charge a secondary battery without a dedicated DC-to-DC charger. Modern vehicles rely on variable-voltage smart alternators. Once their primary starter battery is full, the smart alternator will drop its output voltage to meet emissions and fuel efficiency standards. If you run a traditional dual battery isolator solenoid, your auxiliary battery will never charge past 60-70%, leaving you short on power at camp. To ensure your auxiliary AGM or Lithium battery charges safely to 100% while driving, the voltage profile needs to be stepped up. A smart DC-DC charger can do this.
Yes, both fixed and portable solar charging can be seamlessly integrated into your 12V build. Premium DC-to-DC chargers we install at our Caloundra West workshop feature a built-in MPPT solar regulator with Green Power Priority that will automatically draw power from your solar panels when you’re parked at camp. This intelligent setup reduces the load on your vehicle’s engine and will keep your fridge, lights, and devices running indefinitely without draining your starter battery.
Most standard 4WD dual battery installations take between 4 to 8 hours to complete. A basic behind-seat or under-bonnet installation is typically completed within a single day. More complex, custom canopy electrical fit-outs—including heavy-duty inverter wiring, multi-port switch panels, and custom board mounting—may require your vehicle for 1 to 2 days. When you book your rig into our Caloundra West facility, Shane will provide you with you an exact, fixed-time completion window before you drop it off.
A quality 100Ah Lithium battery will comfortably power a standard 40L–50L portable fridge for 2 to 3 days without any solar or engine charging. Traditional AGM batteries can only safely use 50% of their capacity, but deep-cycle Lithium (LiFePO4) batteries allow you to use up to 90% of their rated power. Depending on ambient summer temperatures on the Sunshine Coast, a modern 12V compressor fridge averages roughly 1.5 to 2.5 Amps per hour. This means your 100Ah lithium build delivers plenty of standalone runtime before requiring an alternator top-up or solar input.
Custom installations use vehicle-specific, heavy-duty wiring and independent fusing to prevent catastrophic failures from vibrations on rough terrain. Cheap, portable pre-built battery boxes often rely on lighter gauge cabling, flimsy internal terminal connections, and plastic casings that grow brittle under extreme 4×4 conditions. Our technician prefers tailoring premium, copper-core marine-grade wiring to your vehicle’s exact length requirements. This will be wrapped in high-temp protective conduit and locked down with heavy-duty circuit breakers. This vibration-resistant architecture eliminates dangerous voltage drops and completely removes fire risks when you’re on the road less-travelled.