At The 12V Lab, we specialise in custom dual battery systems designed to suit the way you actually use your vehicle — whether it’s for touring, camping, caravanning, trade work, or off-grid adventures. An experienced 12V installer Melbourne customers trust, we can help design and install a reliable system tailored to your power needs and future upgrades.

Image of a control panel with various electronic components including a blue Kings 40A battery, a power supply labeled Kings 3000W, a small clear plastic container with colorful wires, a white outlet strip with black and red wires connected, a small digital display, and several switches and knobs. The background shows a dark surface.
Battery system with lithium battery, inverter, and wiring installed inside a vehicle's cargo area.
Battery system with lithium battery, inverter, and wiring installed inside a vehicle's cargo area.
View of an electrical control panel and a large inverter labeled KING5 3000W Pure Sine Wave Inverter installed inside a vehicle or equipment compartment.
View of an electrical control panel and a large inverter labeled KING5 3000W Pure Sine Wave Inverter installed inside a vehicle or equipment compartment.

We provide expert advice and installation for dual battery systems, DC-DC chargers, lithium battery upgrades, solar integration, inverter (240V) systems and start battery protection. Every setup is carefully planned to ensure your fridge, lights, chargers, and accessories continue running reliably when you need it the most.

Inside a metal enclosure with electrical components including a 3000W inverter, 40A controller, a lithium-ion battery, and various switches and wires.
Inside a metal enclosure with electrical components including a 3000W inverter, 40A controller, a lithium-ion battery, and various switches and wires.
The image shows the interior of a vehicle, possibly an RV or camper van, with electronic equipment installed in the storage area. There is a black and blue inverter labeled "KING'S 1000W" connected with cables, and a blue component with the brand name "BATBLOCK25." The background includes carpeted sections and some wires, with the open rear door of the vehicle visible.

DIY dual battery installations often lead to charging issues, flat batteries, poor performance or in some cases unsafe wiring. Getting the job done properly the first time helps avoid costly problems later and gives you confidence your system will perform even under a false floor.

The image shows a setup of power inverters and batteries installed in the trunk of a vehicle, with wiring connecting the devices.
The image shows a setup of power inverters and batteries installed in the trunk of a vehicle, with wiring connecting the devices.
Inside the trunk of a vehicle with battery, inverter, fuses, and fire extinguisher installed, with wooden supports for stability.
The back of a maroon SUV with the trunk open, showing organized tools and equipment including a large black and yellow Dewalt tough system toolbox, a smaller black Kings toolbox, a black toolbox with a sticker saying Sway Control, a black duffel bag, a fire extinguisher, and some tools and supplies. The vehicle is parked outdoors on concrete, with grass and a fence visible in the background.

We believe the quality of the installation is more important than the products themselves. That’s why we only use high-quality components including Australian-made Tycab cable, quality Narva components, correctly sized quality fuses, heavy-duty lugs, double wall Heat shrink with resin to seal the connection, Then to finish it off professional cable protection throughout the install.

A properly built dual battery installation not only improves reliability and safety, but also extends the life of your batteries and electrical equipment. Cheap fuse holders or poor quality connections can put a strain on all your components. Our focus is on dependable clean looking performance, that requires quality components from brands you can trust. Our Brands

Don’t want to see the system? We’ve got you covered. We offer a full range of smart installation and layout solutions designed to neatly conceal your 12V setup while still keeping everything easily accessible when you need it. The goal is to give you a clean, factory-style finish without sacrificing practicality or serviceability, so your power system works hard behind the scenes without getting in the way.

The image shows the inside of a vehicle's trunk with a mounted car audio amplifier, a lithium battery, and a power inverter, arranged neatly.
Inside the trunk of a vehicle with visible electronic equipment including a battery, wiring, and electronic modules.
Inside the trunk of a vehicle with visible electronic equipment including a battery, wiring, and electronic modules.