Tradie Ute and Van Electrics in Sydney

This guide is for Sydney tradies who run a ute or van as a mobile workshop. It covers charging tools, running inverters, dual batteries, work lights and beacons, how to fuse and cable it all safely, and how to keep the vehicle and its gear secure when it is parked on a job.

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A Sydney tradie's day is hard on batteries

A typical Sydney work vehicle might start in a Silverwater or Artarmon trade estate, crawl across the city to a site, sit for hours in a basement or on the street, then do the same again in the afternoon. The engine is off for most of the day while the tools are charging, the fridge is running and the beacon is on.

That pattern is the opposite of what a vehicle charging system is designed for. Short drives and long stops mean the battery is drained during the day and never fully recharged. The answer is to keep your work loads off the starting battery and to charge a separate battery properly whenever the engine runs.

Dual batteries and charging on the go

A second battery in the tub, canopy or van body runs the tool chargers, fridge, lights and inverter while the starting battery is left alone to start the engine. A DC-DC charger between the two is the best option for most late-model utes and vans, because many have smart alternators that lower their charging voltage. A lithium second battery suits tradies well. It handles deep daily cycling, weighs less and holds its voltage under heavy load.

Add a battery monitor so you can see the state of charge at a glance. Our guide on how a dual battery system works covers the layouts.

Inverters and tool charging

Most cordless tool chargers run happily on a good pure sine wave inverter. Size the inverter for the total load you will run at once, plus headroom, and remember that a 12 V inverter draws roughly ten times its output current from the battery. A 1,000 W load means well over 80 A at 12 V once losses are included, so the cable and fuse must be sized to suit. See our guide on choosing and installing an inverter.

Some tool battery brands also sell 12 V vehicle chargers. These skip the inverter and its losses, and can be a more efficient option if you only charge one brand of battery.

If you want 240 V outlets wired into the vehicle body like a building, rather than plugging into the inverter's own sockets, that is fixed 240 V wiring and it must be done by a licensed electrician.

Fusing and cable sizing

Most fires in work vehicles start from small things: a cable that is too thin, a fuse in the wrong place, or a wire rubbing through on a sharp edge. Follow a few rules.

• Fuse every positive feed as close to the battery as practical, so the whole cable run is protected.
• Size the fuse to protect the cable, not the device. The cable must be able to carry more current than the fuse rating.
• Size cable for both current and length. Long runs to a canopy or the back of a van need heavier cable to avoid voltage drop. Use our guide on what size cable you need.
• Use grommets wherever cable passes through metal, and secure it so it can't chafe.
• Read where to put the fuse when wiring an accessory before you start.

Work lights, beacons and light bars: the NSW rules

Work lights on a canopy or tray are useful for early starts and night jobs. Wire them on their own switched, fused circuit and use them only while you are parked and working. Don't drive with them on, as rear-facing work lights can dazzle drivers behind you.

Amber flashing beacons are covered by Transport for NSW's Vehicle Standards Information sheet VSI 08 on flashing lights. It lists the types of vehicles that may have amber lights fitted, such as breakdown and tow vehicles, public utility service vehicles and escort vehicles. It says the light may only flash when the vehicle is standing in a hazardous position or moving in hazardous circumstances, and that flashing gives no priority over other traffic. If your ute doesn't fit one of the listed uses, check with Transport for NSW before fitting one. A site may also require one under its own safety rules.

Light bars are treated as driving lamps in NSW under VSI 64 on aftermarket forward-facing lamps. In summary, you can have up to four driving lamps, a light bar counts as one, they must give white light, and they must switch off with your high beam. The sheet strongly advises against roof mounting because of glare. You must not use them where there is street lighting or within 200 metres of a vehicle you are following or one coming towards you. Rules can change, so check the current sheet with Transport for NSW before you fit one.

Security when the vehicle is parked on a job

A ute or van full of tools is a target, whether it is parked on a street in the inner city, in a shopping centre car park or outside a house in the suburbs. Electrical upgrades can help.

• An aftermarket alarm with sensors on the canopy and rear doors, not just the cab.
• A GPS tracker on its own fused feed, hidden away from the obvious spots.
• Lights inside the canopy wired to the door switches, so you notice if a door is left open.
• A battery isolator or a low-voltage cut-out, so security gear doesn't flatten the battery over a long weekend.

Getting the work done

A well-planned fit-out is worth more than a pile of accessories added one at a time. Plan the whole system: battery, charger, inverter, lights and security, and have it wired as one job with a proper fuse panel. Auto electricians near the trade estates in Silverwater and Artarmon see a lot of tradie fit-outs, and many offer mobile service so the vehicle doesn't have to come off the road for long.

Parts for this job

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Get it done: get a quoteDo it yourself: shop inverters

Get it done: get a quoteDo it yourself: shop amber beacons

Get it done: get a quoteDo it yourself: shop LED work lights

Get it done: get a quoteDo it yourself: shop DC-DC chargers

Questions Sydney drivers ask

Can I run my tool chargers straight off the starting battery?

You can for short periods with the engine running, but it is a common cause of flat batteries on a work ute. Chargers left running while the engine is off can drain the starting battery in a few hours. A second battery charged by a DC-DC charger keeps your tools running and leaves the starting battery for starting the engine.

Is it legal to fit an amber beacon to my work ute in NSW?

Transport for NSW's VSI 08 lists the types of vehicles that may have amber flashing lights, and says they may only flash in hazardous situations. Not every work ute fits those categories. Check the current sheet and contact Transport for NSW if you are unsure, and follow any site safety requirements too.

Does a light bar have to be wired to my high beam?

In NSW, a light bar is treated as a driving lamp under VSI 64. It must switch off automatically when the high beam goes off, and you must be able to switch it off while the high beam is on. Wiring it through a relay triggered by the high beam is the usual way to achieve this. Check the current sheet before you fit one.

What size inverter does a tradie need?

Add up the wattage of everything you will run at the same time, then allow a margin for start-up surges. Many tradies only charge batteries, which need a modest inverter. Running a drop saw or compressor needs far more and is hard on a 12 V system. Size the battery, cable and fuse to match the inverter, not just the inverter itself.

Need an auto electrician in Sydney?

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Run an auto electrical business in Tradie Ute and Van Electrics in Sydney?

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