The short answer: A teardrop camper needs a fraction of a caravan's power. A typical couple burns 30–60Ah a day at 12V, so a 120Ah LiFePO4 battery (about 100Ah usable) paired with 100W of roof solar covers most Australian trips with a two-to-three-night no-sun buffer. Overnight-only campers can drop to 60Ah; heavier setups — a bigger fridge, laptops, longer off-grid stays — step up to a 200Ah bank and 200W of panel.
You can legally do your own 12V wiring in most states provided every circuit is fused near the battery and sized for the run; any fixed 240V work must be done by a licensed electrician under AS/NZS 3001.2. Both the Hip Summit and Hip Companion ship with a 120Ah LiFePO4 · 100W solar · 2,000W pure sine inverter system as standard.
Everything in a teardrop camper — the fridge, the lights, the water pump, your phone — runs off one 12V battery. Understand how that battery gets filled and emptied and every other power decision falls into place. Get it wrong and you either spend thousands on capacity you'll never use, or find yourself at a beautiful campsite with a warm fridge.
The single biggest mistake teardrop buyers make is taking power advice written for caravans. A caravan runs air conditioning, a microwave, a household fridge and a TV; a teardrop runs a compressor fridge, LED lights and your devices. The loads are a fraction of the size — which means the right system is smaller, lighter and cheaper than most guides tell you (the same logic that makes a teardrop cheaper to tow and live with runs right through our teardrop vs caravan comparison). This article covers the whole picture: how much energy you actually use, how to store it, what battery size to buy, the three ways to put charge back, how to draw it out safely, and where Australian law draws the line on DIY.
Jump to what you need: your daily energy budget · the battery and which chemistry · what size battery to buy · solar (with peak-sun-hours by city) · charging while you drive · inverters and 12V loads · safe wiring, cable and fuse sizes · the 240V DIY line · FAQs.
Step 1: Know Your Daily Energy Budget
Start here: everything else is sized from this one number. Camper loads are measured in amp-hours (Ah) at 12V. Add up what you run over 24 hours and you have your daily budget. Realistic teardrop figures:
| Load | Typical daily use | Daily draw |
|---|---|---|
| 22L compressor fridge | 24 h (compressor cycling) | 17–34Ah |
| LED lighting | 2–4 h | 2–4Ah |
| Phones, tablets, camera batteries | Evening charging | 3–6Ah |
| Water pump | Minutes per day | <1Ah |
| Ventilation fan | Warm night | 5–15Ah |
| Typical couple, total | 30–60Ah/day |
Notice what's not on the list: air conditioning, microwaves, household fridges. That's the point of a teardrop — and it's why a well-designed one runs happily on a system a caravan owner would consider small. The fridge dominates everything, and its draw depends heavily on ambient temperature; our solar sizing guide works through three full scenarios if you want to build your own numbers. If you camp mostly self-sufficient, our self-contained teardrop guide shows how power ties in with water and waste.
Step 2: The Battery — Your Energy Tank
The battery is the buffer between charging and use: energy arrives while the sun is up or the wheels are turning, and gets used after dark. Two chemistries dominate the Australian market, and for a teardrop the choice is more lopsided than most comparisons admit:
| AGM (lead-acid) | LiFePO4 (lithium) | |
|---|---|---|
| Usable capacity per 100Ah | ~50Ah (deeper discharge shortens life) | ~80–90Ah |
| Weight per 100Ah | ~28–32kg | ~11–13kg |
| Cycle life | 300–500 cycles | 2,000+ cycles |
| Charge efficiency | ~85% | ~99% |
| Cold-weather caveat | Charges below freezing | BMS blocks charging near 0°C unless self-heating |
On a camper with a 700–750kg tare weight, the ~20kg saving per 100Ah isn't a rounding error — it's payload you get back for water, food and gear, in the nose of the trailer where weight affects tow ball load most. Combined with double the usable capacity and several times the lifespan, lithium is the right answer for almost every teardrop buyer; the full comparison (including the cold-weather exception) is in our LiFePO4 vs AGM guide.
The sizing rule: carry at least two days of your budget as usable capacity, so one overcast day never becomes an emergency. For a typical 30–50Ah/day couple, a 120Ah LiFePO4 — roughly 100Ah usable — is that buffer: two to three nights with no charging input at all. The next section turns that rule into an at-a-glance table.
What Size Battery Does a Teardrop Camper Need?
Match the battery to how you camp, not to the biggest number on the shelf. Take your daily budget from Step 1, double it for a safe usable-capacity target, then pick the nearest lithium size. Because LiFePO4 gives you roughly 80–90% of its rated capacity, a 120Ah battery delivers about 100Ah usable — the reason it's the standard teardrop fitment. This is where teardrops part company with caravans: a caravan guide will point you at 300–400Ah, but a teardrop that size is carrying dead weight it never discharges.
| How you camp | Typical daily draw | Usable capacity you want | Battery to buy |
|---|---|---|---|
| Overnight / weekender, no fridge | 10–25Ah | ~50Ah | 60Ah LiFePO4 |
| Weekends with a 12V fridge (typical couple) | 30–50Ah | ~100Ah | 120Ah LiFePO4 — standard on both Hip campers |
| 1–2 week touring, bigger fridge, laptops | 50–80Ah | ~150–180Ah | 200Ah LiFePO4 |
| Extended off-grid, inverter running hard | 80–120Ah | 200Ah+ | 200–300Ah LiFePO4 |
Two honest caveats sit behind this table. First, the fridge swamps everything, and its draw climbs steeply with ambient heat — a fridge that sips 30Ah on a mild coastal night can push past 50Ah in 38°C outback air, so size for your hottest trips. Second, capacity only helps if you can refill it: a bigger battery with no way to charge just delays the flat by a night. Battery, solar and driving-charge are a set — which is what the next three sections size together. For most couples the 120Ah standard fitment is genuinely the right answer; you can see how it fits the wider spec in what's included on both models.
Step 3: Filling the Tank — Solar First
A roof-mounted panel is the workhorse: it charges silently every daylight hour, wherever you're parked. What it actually delivers depends on season and shade far more than the wattage sticker. The rule-of-thumb figures we use, in peak sun hours (PSH):
- Australian summer, clear day, panel flat on the roof: ~5–6 PSH
- Summer with mixed cloud: ~3–4 PSH
- Southern-states winter, clear: ~3 PSH
- Winter, overcast: ~1–2 PSH
- Heavily shaded bush camp: close to nothing — shade beats wattage every time
In practice a 100W monocrystalline roof panel returns 400–500Wh — call it 33–40Ah — on a decent day. Against a 30–50Ah budget, that's a full or near-full daily replacement — which is why 100W is the classic teardrop fitment, and most teardrop roofs will take up to about 200W if your loads run heavier. When even that isn't enough — deep shade, Tasmanian winter, a fridge working hard in 38°C — the answer is a portable solar blanket you set up in the sun while the camper stays in the shade, or charging as you drive (next section).
Where you camp changes the maths as much as the panel does. Peak sun hours (PSH) — the number of hours of full-strength sun a day delivers — swing widely by city and season across Australia. The table below is the quick reckoner we use; the Bureau of Meteorology publishes exact average daily solar exposure data for every region if you want to check your own destinations.
| City | Summer PSH | Winter PSH | 100W panel, winter (Ah/day) |
|---|---|---|---|
| Darwin | ~6.0 | ~5.5 | ~30–33Ah |
| Brisbane | ~6.0 | ~3.5 | ~18–21Ah |
| Perth | ~7.0 | ~3.0 | ~16–18Ah |
| Sydney | ~6.0 | ~3.0 | ~16–18Ah |
| Adelaide | ~7.0 | ~2.5 | ~14–16Ah |
| Melbourne | ~6.0 | ~2.0 | ~11–13Ah |
| Hobart | ~5.5 | ~1.8 | ~10–12Ah |
Read it against your budget. In a Darwin dry-season winter a single 100W panel nearly covers a 30Ah day on its own; in a Melbourne or Hobart winter the same panel returns barely a third of that, so a clear-sky southern winter is exactly when you lean on a second panel, a solar blanket angled at the sun, or driving-day charging. It's also why "how many watts?" is the wrong first question — where and when you camp decides how hard that wattage has to work.
One component note: the charge controller between panel and battery should be MPPT rather than the cheaper PWM type — MPPT extracts 20–30% more from the same panel, which matters most exactly when conditions are worst.
Step 4: Charging While You Drive
Your tow vehicle generates electricity whenever the engine is running — but getting it into the camper battery properly is where most setups fall down. Three things to know:
- The 7-pin trailer plug is not a charging circuit. Its auxiliary pin and thin wiring exist for lights and brakes; the voltage drop over that connection means almost nothing reaches the battery. Charging current needs its own heavy-gauge run through an Anderson-style connector (the grey 50A plug is the de facto Australian standard).
- Modern alternators killed the direct connection. Most post-2015 vehicles use variable-voltage "smart" alternators that deliberately sit at low output to save fuel. A battery wired straight to one charges slowly, partially, or not at all — and a raw alternator feed was never the right charge profile for lithium anyway.
- A DC-DC charger fixes both. Wired between the vehicle and camper battery, it boosts whatever the alternator provides into the correct multi-stage charge for your battery chemistry. Size it at roughly 20–25% of battery capacity — a 25A unit suits a 120Ah bank — and it adds about its amp rating per hour of driving: a couple of hours on the highway replaces a full day's camp use.
Towing with an EV or hybrid? There's no conventional alternator at all — the vehicle's own DC-DC converter maintains its 12V system, and its capacity to feed a trailer varies by model, so check before wiring anything. The good news: a teardrop's aerodynamic shape and light weight make it one of the few campers EVs tow well, and our EV towing guide covers the real-world range numbers.
Step 5: Powered Sites and Generators — Do You Need Them?
A caravan park's 240V pedestal can recharge a camper battery overnight — if the camper has a 240V inlet and a mains charger fitted (see the legal section below before adding one). It's a genuine convenience mid-trip after days of cloud. But be honest about how often you'll use it: a right-sized solar-plus-lithium teardrop spends most of its life never plugging in, and that's rather the point — unpowered sites are cheaper, quieter and in better spots.
Generators earn their keep on big rigs running air conditioners. On a teardrop they're 20kg of noise solving a problem the system above already solved — and they're banned or restricted in many national parks and quiet hours anyway. If your loads genuinely exceed solar, add battery or panel capacity before adding an engine.
Step 6: Using the Power — 12V Direct vs the Inverter
Run everything you can natively on 12V: fridge, lights, pump, USB charging. Every conversion step wastes energy, so DC-to-DC is always the efficient path.
The inverter exists for the exceptions — anything with a household plug. It converts 12V DC into 240V AC, and two specs matter:
- Pure sine wave, always. Cheaper "modified sine wave" units produce a stepped approximation of mains power that can damage laptop supplies, CPAP machines and anything with a motor. Pure sine wave (PSW) output is indistinguishable from the grid.
- Watts with headroom. Size the inverter to your largest appliance plus margin — a laptop brick barely needs 100W, a kettle or toaster wants 1,800W+. There's no prize for the biggest number: around 300W suits a devices-only camper, 2,000W covers the kettle-and-toaster lifestyle, and oversized inverters just waste more at idle.
| Appliance | Running watts | Minimum inverter | Draw at 12V |
|---|---|---|---|
| Laptop / device chargers | 60–100W | 300W | ~5–9A |
| CPAP machine (no 12V adapter) | 30–60W | 300W | ~3–5A |
| Toaster | 800–1,200W | 1,500W | ~70–110A |
| Portable induction cooktop (your own) | 1,200–1,800W | 2,000W | ~110–160A |
| Electric kettle | 1,800–2,400W | 2,000–3,000W | ~160–200A |
The current column is the part that catches people out: a kettle run through the inverter can pull close to 200A from the battery for the minute or two it's boiling — brief, but it's why inverter cabling is a class of its own (more on that below). A teardrop has no built-in cooktop, so cooking happens on your own portable cooker; if that cooker is electric, this table is how you size the inverter to drive it off-grid.
The habit that saves more power than any component choice: switch the inverter off when you're not using it. Inverters draw current just sitting idle — leave one on for 24 hours and it can quietly eat 10Ah or more, a real chunk of your daily budget, doing nothing.
Step 7: Wiring It Safely — Where Most Guides Go Wrong
If you're wiring accessories yourself (or judging how a camper you're inspecting was built), three rules cover almost everything:
- Every circuit gets a fuse, close to the battery. The fuse protects the cable, so it belongs at the energy source — not at the appliance. An unfused cable run is how camper fires start.
- Cable is sized by current and run length — and longer runs need thicker cable, never thinner. Resistance grows with every metre, so a circuit that's fine at 2m can starve the appliance at 6m. Compressor fridges are the classic victim: undersized cable drops the voltage, the fridge cuts out on low-voltage protection, and the owner blames the fridge.
- Keep voltage drop under 3% — about 0.38V on a 12.8V lithium system, measured over the full loop (there and back). Free online calculators do this in seconds; use one for any run you're unsure about.
Watch the units. Australian retailers sell automotive cable by B&S gauge and by mm² cross-section, and the numbers look interchangeable — they aren't even close. 6 B&S is roughly 13.5mm² of copper; a "6mm" auto cable can carry less than a third of the current over the same run. More than one published guide confuses the two. If a spec doesn't state both the gauge and the run length it was calculated for, don't trust it.
| Circuit | Typical current | Sensible cable | Fuse |
|---|---|---|---|
| LED lighting | 2–5A | 2.5mm² | 10A |
| Water pump | 8–10A | 4mm² | 15A |
| Compressor fridge | 5A avg, 15A peak | 6mm² dedicated run | 20A |
| 25A DC-DC charger | 25A continuous | 13.5mm² (6 B&S); step up to 21mm² (4 B&S) for long vehicle-to-drawbar runs | 40A at both batteries |
| Inverter 1,000W+ | 100A+ | Manufacturer's spec, shortest possible run | Per manufacturer, at the battery |
Inverter cabling deserves its own respect: a 2,000W inverter can pull close to 200A at 12V, which is arc-welder territory — battery-grade lugs, crimped properly, over centimetres not metres. This is factory-engineered wiring in a well-built camper, and it's exactly the part of a cheap build to inspect hardest before buying — our build-quality guide lists the giveaways of a rushed electrical job.
The 240V Line: What You Can DIY and What You Legally Can't
Australian law draws a clean line through camper electrics:
- 12V (extra-low voltage) — generally yours to work on. In most states an owner can legally install and modify 12V DC circuits, which is why the fusing and cable rules above matter: the law lets you do it, physics decides whether you did it well.
- 240V — licensed electrician only. Any fixed 240V work — a shore-power inlet, wall outlets, a hard-wired charger — falls under AS/NZS 3001.2:2022, the standard for electrical installations in transportable structures and vehicles, and must be installed and certified by a licensed electrician. State regulators such as Energy Safe Victoria publish plain-English guidance on what requires a licence.
Practical takeaway when comparing campers: ask who did the 240V work and whether it's certified. And factor the electrician's bill into any "cheap camper plus DIY upgrades" plan — the sticker price rarely includes it, and it's the kind of hidden line our cost-of-ownership guide teases out.
It's a question we're glad to be asked ourselves: Hip Campers has our own in-house electrician — a fully qualified, certified tradesman with more than 20 years' experience — behind the electrical system in every camper we deliver. When you book a viewing, the person who can answer the hard electrical questions isn't a subcontractor three suburbs away.
What This Looks Like Done Properly: Our Standard System
Everything above is exactly how we specified the electrical system that ships standard on both of our campers — sized for real teardrop loads rather than caravan assumptions:
- 120Ah LiFePO4 battery — roughly 100Ah usable; the two-to-three-night no-sun buffer
- 100W monocrystalline roof panel — 400–500Wh on a decent day; a full daily top-up for typical loads
- 2,000W pure sine wave inverter feeding 240V power points in the galley — kettle-and-toaster capable, off-grid
- 12V throughout: 22L compressor fridge (Hip Summit), LED lighting, pressurised water pump, instant hot water, USB charging points
- Factory-engineered wiring with proper circuit protection — our in-house qualified electrician (20+ years on the tools) stands behind it, and it's covered by our 24-month structural / 12-month warranty on fittings and components
No optional-extras game, no "solar-ready" asterisks — the Hip Companion ($21,500) and Hip Summit ($22,500) both arrive with the complete system fitted. And the standard spec is a starting point, not a ceiling — the solar can be upgraded and the inverter sized up or down to suit how you camp, especially on a custom build in the 3D configurator. The full standard-inclusions breakdown is in what's included on both models; see how that system stacks up against generic vans in Hip Summit vs other teardrops, and our off-grid beginner's guide covers the water side of self-sufficiency too.
A right-sized power system is also what makes genuinely remote trips realistic — the electrical spec above is the backbone of our state-by-state off-grid guides for Queensland and Western Australia.
Cold, Shade and Winter: The Honest Caveats
Three conditions bend the rules above, and it's better to know now:
- Lithium won't charge near freezing. LiFePO4 management systems block charging around 0°C to protect the cells. Alpine and Tasmanian winter campers should look for self-heating batteries or plan charging for the warmer part of the day. Discharging — using the battery — is unaffected.
- Winter sun is real but short. At ~3 PSH on a clear southern winter day, a 100W panel still returns ~20–25Ah — workable for careful loads, thin for heavy ones. Driving-day charging or a solar blanket closes the gap; our winter camping guide covers the rest of the cold-weather picture.
- Shade is absolute. No panel wattage overcomes a tree canopy. Park the camper in the shade for comfort and put a portable panel in the sun — not the other way around.
Frequently Asked Questions
What power system does a teardrop camper need?
Far less than a caravan. A couple running a compressor fridge, LED lights, a water pump and device charging typically uses 30–60Ah a day at 12V. A 100–120Ah lithium (LiFePO4) battery with around 100W of roof solar covers that comfortably for most Australian trips; heavier setups — a bigger fridge, laptops, longer stays — step up to a 200Ah bank and 200W of panel. Either way it's a fraction of a caravan system: sizing a teardrop off caravan advice just adds cost and weight.
What size battery do I need for a teardrop camper?
For a typical couple with a 12V compressor fridge, a 120Ah LiFePO4 battery — about 100Ah usable — is the sweet spot: two to three nights with no charging input at all, and paired with 100W of roof solar it tops back up daily. Overnight-only camping with no fridge runs happily on 60Ah, while heavier setups (a bigger fridge, laptops, an inverter running a kettle, week-plus off-grid stays) step up to a 200Ah bank. Sizing off caravan advice — 300–400Ah — just loads a teardrop with weight and cost it never uses. Both Hip campers ship with a 120Ah LiFePO4 as standard.
Is 100W of solar enough for a teardrop camper?
For typical teardrop loads, yes. In decent Australian sun a 100W roof panel returns 400–500Wh (roughly 33–40Ah) a day, which replaces a day's fridge, lighting and phone charging. Most teardrop roofs have space for up to about 200W if your loads run heavier. In deep shade or southern winter no roof panel keeps up on its own — that's when a portable solar blanket or driving-day charging fills the gap.
Do I need a DC-DC charger for a teardrop camper?
Not always, but it's the best upgrade for winter or heavily shaded trips. Modern vehicles use variable-voltage "smart" alternators, so plugging a trailer battery straight into the tow vehicle delivers very little charge. A properly wired 25A DC-DC charger adds roughly 25Ah for every hour of driving with the correct charge profile for lithium.
Can I run 240V appliances off-grid in a teardrop camper?
Yes — through a pure sine wave inverter sized to your biggest appliance: around 300W covers laptops and CPAP machines, while 1,500–2,000W runs a kettle or toaster straight off the 12V battery, no powered site needed. Pure sine wave matters: cheaper modified sine wave inverters can damage sensitive electronics. And switch the inverter off when you're not using it — it draws power even at idle.
Can I do my own 12V wiring on a camper trailer in Australia?
Generally yes — extra-low-voltage 12V DC work can legally be done by the owner in most Australian states, provided every circuit is fused near the battery and cable is sized for both the current and the length of the run. Anything at 240V — an inlet, wall sockets, hard-wired chargers — must be installed by a licensed electrician under AS/NZS 3001.2. Hip Campers' own electrical work is handled by our in-house fully qualified electrician — a certified tradesman with over 20 years' experience.
How long does a 120Ah lithium battery last off-grid?
A 120Ah LiFePO4 battery offers roughly 100Ah of usable capacity. Running a 22L compressor fridge, LED lights, water pump and device charging — a typical 30–50Ah day — that's two to three nights with no sun at all. With a 100W roof panel getting reasonable sunlight, the battery tops back up daily and modest loads can run more or less indefinitely. Need a bigger buffer? The same maths scales — a 200Ah bank doubles it.
Do I need a battery monitor on a teardrop camper?
It's worth having, though you can camp without one. LiFePO4 has a very flat voltage curve — it sits near 13.2V until it's almost empty — so a plain voltmeter can't tell you your real state of charge. A shunt-based battery monitor (a coulomb counter) measures the amp-hours flowing in and out and shows a true percentage, turning "am I about to run out?" guesswork into a number. On a simple teardrop with one battery and modest loads it's a comfort upgrade rather than a necessity; on a heavily used off-grid setup it earns its place fast.
Do electric trailer brakes run off the camper's battery?
No — electric brakes are powered from the tow vehicle through the trailer plug and controlled by a brake controller in the car. The separate breakaway system carries its own small battery that applies the brakes if the trailer ever detaches. Neither drains the camper's house battery while you drive. How the whole braking system works is covered in our electric brakes guide.
The Bottom Line
A teardrop power system done right is boring — in the best way. Budget your real loads (30–60Ah a day for most couples), size the battery to two days of that (120Ah lithium for most), put them back with roof solar plus a driving-day top-up, convert to 240V only when an appliance demands it, and respect the two safety lines: fuse-and-size every 12V run, leave every 240V wire to a licensed electrician. Get those right and the "will the fridge stay cold?" question simply stops coming up — a big part of why, for the right camper, a teardrop is genuinely worth it.
Or skip the engineering homework entirely — it's already done. See current stock and pricing, build your own in 3D from $18,000, compare the field in our best teardrop campers roundup, or book a viewing in Melbourne or Perth and go through the electrical system in person. More questions on specs and ownership are answered on our FAQ page.