A 79 Series is built to carry weight, cover distance and get into country where a flat auxiliary battery is more than an annoyance. It can mean warm beer, a dead compressor, no camp lights and no way to keep the fridge running. This 79 series touring power setup example is designed around a common real-world build: a tray or canopy-equipped LandCruiser that needs dependable 12V power for weekends away, extended remote trips and work between camps.
The point is not to throw the biggest battery and inverter at the vehicle. A proper system starts with the loads you actually run, the time spent stationary, where the gear can safely live and how quickly you can recharge it while driving.
The 79 Series touring power setup example
For a serious touring 79, a 200Ah lithium auxiliary battery is a strong starting point when paired with a quality 40A DC-DC charger, roof-mounted solar and a properly fused distribution system. This gives enough stored power for the normal touring gear without filling the canopy with unnecessary batteries.
Here is the working example.
| Component | Example specification | Why it suits a touring 79 |
|---|---:|---|
| Auxiliary battery | 200Ah lithium battery with internal BMS | High usable capacity in a manageable package |
| DC-DC charger | 40A charger with solar input | Charges properly from the alternator and solar panel |
| Solar | 200W fixed panel | Helps keep the fridge and small loads covered while camped |
| Inverter | 2,000W pure sine wave unit | Runs selected 240V items when needed, not permanently |
| Battery monitor | Shunt-based monitor | Shows actual amps, state of charge and consumption |
| Distribution | Fused 12V fuse block and busbars | Keeps every accessory protected and easy to diagnose |
| Main cabling | Sized to cable run and load | Reduces voltage drop and heat under high draw |
This is a capable setup, but it is not the right answer for every 79. A bloke running only a fridge, a couple of lights and mobile charging may be better served by 100Ah to 150Ah. On the other hand, a touring family using an electric cooking appliance, compressor fridge, Starlink-style internet equipment, camera charging and electric air conditioning while parked will need a much closer look at battery capacity, alternator charge time and solar area.
What 200Ah really gives you
A 200Ah lithium battery holds roughly 2.4kWh at 12V. Allowing sensible usable capacity and system losses, it provides a healthy reserve, but it is not unlimited power. A fridge might use 30Ah to 60Ah in a day depending on ambient temperature, cabinet size and how often it is opened. Lights, water pump, device charging and a few hours of communications gear can add another 20Ah to 40Ah.
That is why a 200Ah battery works well for normal camp life. You have capacity to get through a night or two without relying on perfect sunshine, then the 40A DC-DC charger can put meaningful charge back into the system while you are driving.
Electric air conditioning changes the equation. A 12V electric A/C system can draw substantial current, especially in Australian summer conditions. If you want cooling with the engine off, the battery bank, cable size, charging source and run time must be designed around the specific unit. Do not treat an A/C load like a fridge. It is a major system load and deserves its own calculation before buying gear.
Start with battery placement, not accessories
The best electrical plan can be ruined by poor placement. In a 79 Series tray build, the auxiliary battery is commonly housed in a protected canopy compartment, drawer module or sealed battery box. It needs to be secured against corrugations, kept clear of water ingress and positioned where you can inspect terminals and fuses without stripping the whole camp setup apart.
Lithium batteries do not need the same ventilation arrangement as flooded lead-acid batteries, but they still need protection from extreme heat, physical damage and loose gear. A battery sliding around on a rough track is not touring equipment. It is a fault waiting to happen.
Keep the inverter close to the auxiliary battery where practical. Inverters can pull serious current at 12V. A 2,000W inverter may draw well over 160A under a heavy load, so the DC cable between battery and inverter must be short, correctly sized and protected according to the inverter manufacturer’s requirements. Long, undersized inverter cables create voltage drop and heat, which leads to poor performance and nuisance low-voltage cut-outs.
Charging from the 79’s alternator and solar
A DC-DC charger is the heart of this setup. It gives the lithium battery a controlled charging profile and protects the charging system from being asked to do more than it should. A 40A unit is a sensible match for a 200Ah lithium battery in many 79 Series touring builds because it provides useful recharge speed without turning every drive into a wiring stress test.
The charger input must be fed from an appropriately protected source battery circuit, typically through quality cable, a fuse or circuit breaker close to the crank battery, and an ignition trigger if required by the charger. The output to the auxiliary battery needs its own protection as well. Fuses are there to protect the cable, not just the device at the end of it.
A 200W solar panel will not magically recharge a heavily depleted 200Ah battery in one afternoon. In good sun it can make a solid contribution, especially when the fridge is the main ongoing load. It is best viewed as a way to extend your stay and reduce reliance on driving, rather than a replacement for alternator charging.
If the 79 spends long periods parked under trees, carries a rooftop tent that shades the panel, or sees winter touring, consider portable solar as an addition. It lets you park the ute in the shade while putting the panel where the sun actually is. Just make sure the solar input and plugs are rated for the job and protected from physical damage.
Build the distribution board so faults are simple
A tidy power board turns a complicated touring system into something you can diagnose on the side of the track. Mount the DC-DC charger, fuse block, busbars, battery monitor shunt and major breakers in one accessible area. Label every circuit clearly. Six months after the build, you should still know which fuse runs the fridge, rear work lights, water pump, compressor outlet and USB outlets.
Run high-draw accessories on their own circuits. The fridge should not share protection with camp lights. A compressor outlet should not be fed through a light-duty socket circuit. If a single accessory faults, you want that circuit isolated while the essentials keep working.
For this 79 Series touring power setup example, a practical layout is a main battery fuse feeding positive and negative busbars. From there, the inverter has a dedicated high-current fused feed, the DC-DC charger connects directly to the battery side as specified, and smaller accessories leave through a fused distribution block. The battery monitor shunt goes in the main negative path so it can measure all current entering and leaving the auxiliary battery.
Do not bypass the shunt with random negative cables. If a load returns directly to battery negative instead of through the shunt, the monitor cannot accurately tell you what is being used. A battery monitor is only useful when the wiring layout supports it.
Cable size and voltage drop matter in a 79
The tray length of a 79 Series can make cable routing longer than people expect. Cable that looks adequate on paper can lose too much voltage once it runs from the crank battery, along the chassis, through a canopy and into a charger. This is especially relevant for DC-DC charger inputs, fridge feeds and inverter circuits.
Choose cable size based on current, total cable length and acceptable voltage drop. Protect it at both ends where the circuit design requires it, use proper crimp lugs, heat shrink and abrasion protection, and secure it away from exhaust heat, sharp chassis edges and moving parts. Corrugations find weak wiring quickly.
Avoid relying on a body earth for every accessory return. A dedicated negative return cable and proper negative busbar give more predictable results, particularly with sensitive electronics and high-draw equipment. Earth bonding still matters, but it should be intentional rather than a collection of random self-tappers into painted metal.
Make room for the next upgrade
A good touring electrical system should leave you options. Allow spare ways in the fuse block, space on the busbars and a sensible route for additional cabling. You may not need a rear Anderson outlet, more USB-C charging, a water pump or extra canopy lighting today, but it is far easier to add them to a planned board than rebuild a tangled system later.
At Tuck's Performance, the focus is on DIY gear that can be tested, understood and installed properly rather than hidden behind vague claims. If you are unsure about charger size, battery capacity or whether an electric A/C load suits your planned system, work from the real amp draw and expected run time first.
Build the power system around the trips you actually do, label it like you will need to fault-find it in the rain, and give every cable and fuse the respect it deserves. That is how a 79 stays useful long after the bitumen ends.
