Off-Grid Solar for Tiny Homes in Australia

Australia's tiny house movement has grown well beyond a niche lifestyle choice — rising land and construction costs have pushed more people toward tiny homes on wheels, granny flats, and small fixed dwellings as a genuinely practical housing option. Power is one of the first problems any tiny home owner has to solve, and for most, that means some form of portable or off-grid solar rather than a conventional grid-tied rooftop system.

Why tiny homes usually aren't grid-tied

A standard rooftop solar installation in Australia requires a CEC-approved inverter certified to AS/NZS 4777 and a licensed electrician, because the system feeds power back into the grid. That framework assumes a fixed dwelling with a permanent electrical connection and a NMI (National Metering Identifier) tied to the property.

Tiny homes on wheels don't fit that model at all — they're not fixed to a single property, often move between sites, and frequently don't have a formal grid connection in the first place. Tiny homes on a permanent foundation or a granny flat/secondary dwelling arrangement are closer to a conventional install and should follow the granny flat and secondary dwelling guide if grid connection is genuinely on the table. But for most tiny house owners, especially those on wheels or on off-grid rural blocks, an entirely self-contained solar-and-battery system is both the practical and the legal path — no CEC-approved inverter requirement, because nothing is exported to a grid.

Sizing a system for actual tiny home loads

Tiny homes have genuinely different power profiles from a full-size house, and sizing a system starts with an honest load list rather than a generic solar calculator:

• Lighting and electronics: LED lighting, laptop and phone charging, a small TV — low continuous draw, easily covered by a modest system.
• Refrigeration: a 12V or efficient compressor fridge is one of the biggest continuous loads in most tiny homes and the one most worth budgeting generously for, since it runs around the clock.
• Induction or gas cooking: induction cooktops draw significant power in short bursts; many tiny home owners use gas for cooking specifically to keep the electrical load manageable.
• Water pumping: a 12V water pump for tank-fed plumbing is a small but essential load.
• Climate control: this is the wildcard — a fan or evaporative cooler is modest, but any form of air conditioning or electric heating pushes total system size up dramatically and is worth sizing separately.

Our battery sizing guide walks through the underlying maths in more detail, but as a rough starting point, a tiny home covering lighting, electronics, and an efficient fridge typically needs 800W–1,600W of panel and a 2–5kWh battery bank, scaling up meaningfully if cooking, heating, or cooling loads are added to the electrical (rather than gas) side of the ledger.

Roof space is the real constraint

A tiny home on wheels typically has 15–25 square metres of roof, and most of that is competing with vents, skylights, and air conditioning units for space. This is a genuinely different design problem from a full-size roof, and it usually means prioritising higher-efficiency panels over cheaper, larger ones — squeezing more watts into a fixed, small footprint matters more here than almost anywhere else in residential solar. Some owners supplement fixed roof panels with a portable folding panel deployed on the ground when parked for an extended stay, similar to the approach covered in our caravan and grey nomad guide.

Battery choice matters more for tiny homes than most systems

Because a tiny home's entire power supply typically runs through one battery bank rather than falling back to grid power when solar runs short, battery quality and capacity carry more weight here than in a grid-tied home topping up a car battery or backup circuit. LiFePO4 chemistry is the practical standard for this use case — see our battery storage guide for why it's displaced older lead-acid and AGM setups in almost all new off-grid builds, thanks to a longer cycle life and safer thermal behaviour under the kind of daily deep-cycling a tiny home battery bank goes through.

Council approval and where you're allowed to park

Solar sizing is only half the tiny home equation — where you're legally allowed to live in one varies enormously by council and by state, and that's a separate question from the electrical setup. If you're planning a tiny home on a family member's rural block or an off-grid property more broadly, our off-grid solar for remote properties guide and general off-grid solar guide cover the broader system design questions that apply whether the dwelling is tiny or full-size.

Heat and bushfire considerations

Tiny homes are disproportionately common in regional and semi-rural areas, which raises the same bushfire considerations covered in our bushfire resilience guide — worth reading if your tiny home sits in a fire-prone area over summer, particularly around battery placement and defensible space around ground-mounted panels.

Do I need a CEC-approved inverter for a tiny home solar system?

Only if you're connecting to the grid. A fully off-grid tiny home system — panels, charge controller, battery bank, and a standalone inverter for AC loads — isn't feeding power back anywhere, so it sits outside the AS/NZS 4777 and CEC-approval framework entirely.

How much solar does a tiny home actually need in Australia?

For lighting, electronics, and an efficient fridge, 800W–1,600W of panel with a 2–5kWh battery bank covers most tiny homes. Adding electric cooking, heating, or cooling pushes that considerably higher — it's worth sizing those loads separately rather than assuming a standard kit will cover them.

Can I use the same portable solar setup for a tiny home and a caravan?

Largely yes — the underlying technology (folding or fixed panels, a charge controller, a LiFePO4 battery bank, and an inverter) is the same category of equipment covered in our caravan and grey nomad guide, just sized up for a tiny home's higher and more continuous daily load.