Do I Need A Generator For The Big Lap?

Generators are one of those gear purchases that inspires strong opinions. Ask in any caravan Facebook group and you’ll get people who insist a generator is essential and people who insist it’s dead weight. The truth, as usual, sits somewhere in between, and the right answer depends entirely on how you travel.

This guide helps you work out whether a generator belongs in your setup, and if so, what kind.

When A Generator Makes Sense

Extended overcast weather. Solar panels are your primary off-grid charging source, but they rely on sunshine. Three consecutive overcast days in southern Australia will deplete most battery systems regardless of how much solar you have. A generator can top up your batteries in two to three hours, getting you through until the sun returns.

Running high-draw appliances off-grid. Air conditioning off batteries requires an enormous (and expensive) battery bank. Running an air conditioner off a generator for a few hours during the hottest part of the day is a practical alternative, particularly in the Top End where temperatures can make a van uninhabitable without cooling.

Remote bush camping. If your Big Lap includes extended stays in genuinely remote areas where you’re camping for weeks with limited sun exposure (under tree canopy, in gorges, during the wet season), a generator provides reliable backup power.

Emergency backup. A generator is insurance against primary system failure. If your solar controller dies, your DC-DC charger fails, or your battery develops a fault, a generator keeps things running until you can get repairs.

Power tools and heavy equipment. If you need to run welders, grinders, compressors, or other heavy-draw tools for caravan maintenance or vehicle recovery on the road, a generator is the only practical option off-grid.

When You Don’t Need One

You have a well-sized solar and battery system. A 400W+ solar setup with a 200Ah+ lithium battery and an MPPT controller handles most Australian conditions for most travellers. If your batteries are fully charged by mid-afternoon on a sunny day, your system is keeping up.

You mostly stay at caravan parks. If you’re plugging into mains power three or more nights per week, your 240V charger and DC-DC charger while driving keep your batteries topped up. A generator would sit unused.

You travel primarily in sunny regions. Northern Australia (QLD, NT, northern WA) gets reliable sunshine for most of the year. Solar alone is usually sufficient.

Noise and restrictions bother you. Generators are noisy, even the quiet inverter models. Many popular free camps have generator restrictions (limited hours or outright bans). Most national parks ban generators. If your preferred camping style is peaceful bush camps and national park sites, a generator may not be usable where you want it most.

The Noise & Etiquette Factor

This deserves its own section because it’s the practical issue most generator owners underestimate. Even a “quiet” inverter generator produces 50 to 60 decibels at rated load, roughly the volume of a normal conversation heard from 3 metres away. In a quiet bush camp at 6am, that’s enough to wake every neighbour within earshot.

Caravan park rules typically prohibit generators entirely. Many free camps have generator-free hours (commonly 8pm to 8am, sometimes broader). Some camps ban them altogether. National parks in every state either ban generators or restrict them to specific areas.

The practical result: even if you own a generator, there will be many situations where you can’t or shouldn’t use it. This is why a good solar and battery system should be your primary power strategy, with a generator as backup rather than your main power source.

Generator vs Bigger Battery: The Cost Comparison

Some travellers buy a generator when the better investment would be upgrading their battery and solar system. Here’s how the numbers stack up:

A quality 2kVA inverter generator: $1,000 to $2,000 upfront, plus ongoing fuel costs ($3 to $5 per hour of running), maintenance (oil changes, spark plugs), and the weight penalty (20 to 25kg). Over a year of regular use (running 2 hours per week), fuel alone adds $300 to $500.

Upgrading from AGM to 200Ah lithium + extra solar panel: $2,500 to $4,000 upfront, zero ongoing fuel cost, minimal maintenance, and a net weight saving (lithium is lighter than AGM). The lithium system produces and stores power silently, works in generator-restricted areas, and lasts 7 to 15 years.

For most Big Lappers, the battery and solar upgrade delivers better value over the life of the trip. The generator wins in specific situations (extreme weather, emergency backup, running air con) but loses on daily convenience, running costs, and usability restrictions.

The sweet spot for many travellers: upgrade your battery and solar first, and add a small generator later if you find there are genuine gaps your primary system can’t cover.

So, Do You Need One?

Yes, if: You plan to run air conditioning off-grid regularly, you’re heading into extended remote areas with limited sun, you need to run power tools on the road, or you want genuine emergency backup for an off-grid lifestyle. In these cases, a quality 2kVA inverter generator is a worthwhile addition.

No, if: Your solar and battery system covers your daily needs, you mostly camp at parks or sunny free camps, you value quiet camps, or you’re trying to keep weight down. Invest in better batteries and solar instead.

Maybe, if: You’re unsure how much free camping you’ll do or where you’ll travel. In this case, start without one. If you find yourself consistently running short on power in situations where solar can’t keep up, buy one on the road. They’re available at Bunnings and machinery dealers in every regional town.