4WD Dual Battery & Touring Setups
Dual Battery Systems & 4WD Touring Power
Dual battery systems including lithium, DC-DC chargers, solar, battery monitoring, fridge and winch wiring, and canopy touring fitouts.
Quick answer
Does my 4WD need a DC-DC charger or will an isolator do?
It depends on the vehicle. Many newer vehicles use smart or variable-voltage alternators that can lower charging voltage once the start battery is charged, which can leave an auxiliary battery undercharged through a simple isolator. A DC-DC charger regulates the charge to suit the auxiliary battery. The right charger depends on the battery manufacturer’s charging limits, the vehicle’s charging system and the other loads on it, not battery capacity alone. Wired Right in Albion Park Rail assesses the vehicle before recommending a setup.
A dual battery system depends on more than the battery. Cable size, fuse placement, charge sources and the loads you run all affect how it performs away from mains power, so we start with your vehicle and how you use it.
Cable is sized for the run length and the current, because undersized cable increases voltage drop, which limits charge current and the voltage reaching your accessories. Charging settings follow the battery and charger manufacturers’ instructions. The quotation will identify the work and any reports or wiring diagrams included.
What this covers
Dual battery systems including lithium
AGM, lead-carbon and lithium (LiFePO4) systems chosen around how you use the vehicle, and mounted where the chosen battery manufacturer’s instructions allow.
DC-DC chargers
Selected from the battery manufacturer’s charging limits, the vehicle’s charging system and the other loads it supplies, not from battery capacity alone.
Solar panels & regulators
Fixed and portable panels with MPPT regulation, with fusing and cabling designed to the panel and regulator manufacturers’ instructions.
Battery monitoring
Shunt-based monitors that track current in and out, available where they suit the system.
Fridge, compressor & winch wiring
High-current circuits sized for the load, with winch protection and isolation designed to suit the winch manufacturer’s instructions and the vehicle.
Canopy & drawer system electrics
Anderson feeds, fuse panels, lighting, USB and 12 V outlets built into the fitout.
Touring switch panels
Switch panels with individual circuit protection, positioned for access with the canopy open.
Full 4WD electrical fitouts
Builds from battery to accessory, scoped and quoted for your vehicle.
How the job runs
- 1
Work out the load
Fridge, lights, water pump and charging devices estimated in amp-hours per day before any hardware is chosen.
- 2
Assess the vehicle
The alternator type, charging behaviour and available space are checked on your vehicle rather than assumed from its age.
- 3
Choose the charge sources
DC-DC from the alternator, solar and mains charging at home, combined to suit how you travel.
- 4
Size, fuse and install
Cable sized for length and current, circuit protection selected for the cable and equipment, and components installed to the manufacturers’ instructions.
- 5
Hand over
We go through the system with you. The quotation will identify any monitor, labelling, reports or wiring diagrams included.
4WD Dual Battery & Touring Setups: common questions
Should I go lithium or stay with AGM?
Lithium (LiFePO4) batteries are lighter for their rated capacity and generally allow more of that capacity to be used, but they cost more up front and need charging equipment with a suitable profile. AGM costs less and suits some setups. The right choice depends on your loads, how long you stay put between drives, where the battery can be mounted and your budget, so we talk through the trade-offs for your vehicle.
Do I need a DC-DC charger or will an isolator do?
It depends on the vehicle. Many newer vehicles have smart or variable-voltage alternators, which can lower output once the start battery is charged and leave an auxiliary battery undercharged through a simple isolator. We check your vehicle’s charging system, the battery you plan to use and your other loads before recommending an approach.
Where should the second battery go, under the bonnet or in the tray?
Under the bonnet, in the tray or in the canopy can all be options, depending on the vehicle. The location follows the chosen battery manufacturer’s instructions, including any temperature and mounting requirements, as well as the space available and the cable run. A longer run to the tray or canopy needs heavier cable to keep voltage drop in check.
How long will my fridge run on a dual battery setup?
It depends on the fridge, its settings, the weather, how often it is opened, the battery’s usable capacity and how much charging it gets from driving or solar. We can work through your expected loads with you to estimate it, but any figure is an estimate based on those assumptions, not a guarantee.
Will you fix someone else’s dual battery install?
Yes. We test the system, explain what we find and quote any corrections. Things we check include cable size, fuse type and placement, and whether the charging equipment suits the vehicle and battery. Some faults require inspection and testing before a repair estimate can be provided.
Where we do this work
Based in Albion Park Rail, by appointment only, serving customers from across the Illawarra and Shellharbour. Contact us to discuss the work you need and current availability.
Related work
4WD Dual Battery & Touring Setups
Talk to us about this job
Ring or send the vehicle details and what it needs. We will get back to you about the work and current availability, and the scope is confirmed with you before any work is authorised.