Five questions, plain-English answers, real numbers — not specs.
Four ways to refill the battery. Most Voltsen units accept three at once.
Most units fully recharge in 1–2 hours from a standard Australian wall socket. UPS-grade units (Roam 1800, Base 2400) keep your appliances running while they themselves charge.
Silent, free fuel once you own the panel. A 200W foldable panel refills a 1,000Wh unit in roughly 6 hours of strong sun. Larger Base units take up to 1,800W of solar in.
Slow — typically 8–10 hours for a full refill — but useful while driving between camps. Plug into your cigarette lighter or a dedicated Anderson plug.
Works on the smaller units only (Spark 270, Roam 300). Up to 100W in via a single USB-C cable — the same charger that runs your laptop.
Most Voltsen units accept three of these four sources simultaneously — so you can wall-charge while driving while solar tops it up. Specific input options vary by model — check each product page.
Three groups of buyers, three very different appliance lists.
Real numbers, every unit, every common appliance. Skip the spec sheet maths.
The 0.85 is real-world efficiency loss from the inverter and battery management — it's almost never published, but it's the honest number.
| What you're running | Spark 270 | Roam 300 | Roam 700 | Roam 1800 | Base 2400 |
|---|---|---|---|---|---|
| Battery | 270Wh | 236Wh | 472Wh | 945Wh | 2,048Wh |
| Usable (×0.85) | 228Wh | 201Wh | 401Wh | 803Wh | 1,741Wh |
| Phone charges (15W) | 15 | 13 | 27 | 53 | 116 |
| Laptop work (60W) | 3.8 h (USB-C) | 3.4 h | 6.7 h | 13.4 h | 29 h |
| LED lights (10W) | n/a (DC only) | 20 h | 40 h | 80 h | 174 h |
| 12V fridge (60W avg) | n/a | 3.4 h | 6.7 h | 13.4 h | 29 h |
| CPAP overnight (30W avg) | n/a | ~1 night | ~2 nights | ~3–4 nights | ~8 nights |
| TV (100W) | n/a | 2 h | 4 h | 8 h | 17 h |
| Kettle (1500W) | n/a | n/a — exceeds AC rating | n/a — exceeds AC rating | 32 min | 70 min |
| Microwave (1000W) | n/a | n/a — exceeds AC rating | n/a — exceeds AC rating | 48 min | 105 min |
| Hair dryer (1500W) | n/a | n/a — exceeds AC rating | n/a — exceeds AC rating | 32 min | 70 min |
| Induction cooktop (1800W) | n/a | n/a — exceeds AC rating | n/a — exceeds AC rating | n/a — exceeds AC rating | 58 min |
Real-world runtime varies ±15% depending on temperature, battery age, and how much of the unit's capacity you use (running deeper into the battery is less efficient). These numbers assume room temperature and a new unit. The Spark 270 is DC-only (USB-C PD output, no AC outlet) — high-draw appliances aren't applicable.
A four-step recipe. Takes about 90 seconds with a calculator.
Write down everything you want to run at the same time on the same trip.
Multiply each appliance's wattage by hours you'll run it. Sum the total to get Wh needed per day.
Covers inverter efficiency loss, cold-weather capacity dip, and future appliances you haven't bought yet.
Pick the smallest Voltsen unit whose battery capacity covers your buffered total.
12V fridge (60W × 24h = 1,440Wh) + LED lights (10W × 8h = 80Wh) + phone charging (15W × 2h = 30Wh) + laptop (60W × 4h = 240Wh) = 1,790Wh per day.
Add 25% buffer → 2,238Wh.
Recommended unit: Base 2400 (2,048Wh) — runs the kit for a full day, then recharge from solar on day 2.
Five honest differentiators. No bashing — just where we genuinely beat the imports.
3 years, handled from our Oakleigh VIC warehouse. No shipping units back overseas. Competitor claim turnaround averages 6–12 weeks; ours is 5–10 business days.
Next-generation lithium chemistry that delivers ~70% capacity at -20°C vs ~50% for plain LFP. Matters in alpine country and winter trips.
Including WA, NT and regional Queensland. Most imports charge $50–$200 freight or restrict remote delivery altogether.
Native 230V / 50Hz Type I AU plugs, RCM-marked, AS/NZS-compliant. Some imported units run on 110V transformers or US plug adapters.
Same cell supply chain, same engineering as the big brands. The difference is we're not funding global multi-million-dollar marketing budgets.
See the full side-by-side at Compare → — every spec, every price, every warranty term.
Refundable $50 deposit · 8-week delivery · 3-year warranty handled in Australia.