The Redback RB3.5 is the lightest 3.5 kVA pure-sine-wave portable inverter generator on the Australian market in 2026. At around 24 kg, and 3.5 kVA peak power, it's a very attractive option for campers or tradies who don't want to lift a 30+kg generator in/out of the ute all the time. After a month of testing on a caravan and at the campsite, here's the honest verdict.
Redback RB3.5 3500W Inverter Generator - By iTechworld
Redback is an Australian brand owned by iTechworld, the same company behind the 12 V battery and solar gear that's been popular in the Australian caravan and 4WD market for years. iTechworld's positioning is ‘quality at a value price, supported in Australia’, and the RB3.5 fits that philosophy: it doesn't try to out-spec the more expensive Honda or Briggs models, it tries to deliver the same useful performance at a lower price and a lower weight.
Service and support are run directly out of Australia. Parts are stocked here, the warranty is administered here, and you can call a real Australian phone number when you need help. That's a meaningful advantage over some of the no-name imports at similar price points.
Redback RB 3.5 Specs at a Glance
- Peak power: 3.5 kVA / 3,500 W
- Continuous power: 3.0 kVA / 3,000 W
- Inverter: Pure sine wave
- Engine: 4-stroke OHV petrol, single cylinder
- Start: Electric start with manual recoil backup
- Outlets: 240V AC, 12V DC, USB
- Noise level: ~66 dB at 7 m (quarter load)
- Run time: Up to ~6 hours at 25% load
- Fuel tank: ~5 L
- Weight: ~24 kg
- Warranty: 1-year domestic
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Redback RB3.5 3500w Inverter Generator - Shop Now
The Redback Rb3.5's Weight — Why It Matters
Generator weight is the spec nobody mentions in the showroom but everybody curses on the campsite. A 3.5 kVA Briggs P3500 weighs around 40 kg. A 3.5 kVA Hyundai HY3500i weighs around 30 kg. The RB3.5 weighs around 24 kg. The difference between 40 kg and 24 kg is enormous in practice — it's the difference between needing two people (or risking your back) and being able to one-hand it out of a caravan boot.
If you camp every weekend, this matters every weekend. If you camp twice a year, it doesn't really matter at all.
The RB3.5 Engine and Inverter Review
Same basic recipe as everyone else in the category: a 4-stroke OHV petrol engine driving an alternator, with the output rectified to DC then re-inverted to pure sine wave AC. It's a proven architecture and the RB3.5's execution is solid. Pure sine wave at THD well under 5% — safe for caravan air conditioner control boards, modern fridges, laptops, CPAP machines and any modern electronics.
What you don't get is the long-stroke smoothness of the Briggs Quiet Power Technology motor, or the Hyundai's slightly bigger 7 L tank. The RB3.5's smaller fuel tank (5 L) gives shorter run times — around 6 hours at quarter load instead of the Hyundai's 7 — and the engine is fractionally less smooth under sustained heavy load.
Real-World Test 1: Caravan
Hooked to a 16 ft caravan with a 2.0 kW window-style AC, the RB3.5 started the AC cleanly first time and held it under sustained load. The 3.5 kVA peak is enough to handle the AC compressor surge as long as you're not also running the kettle. Continuous load at AC plus fridge plus lights sat around 80 to 85% of the RB3.5's rating — useable but no headroom for the kettle on top.
If your AC is a smaller 1.4 to 1.6 kW unit, the RB3.5 has more breathing room. If your AC is closer to 2.5 kW, you'll be running near the continuous limit — step up to the RB4.5 EFI or the Hyundai HY3500i instead.
Real-World Test 2: Camping
This is where the RB3.5 shines. We carried it on a weekend bush trip — a 24 kg generator is genuinely easy to lift solo over rough ground, and the small chassis tucks into a vehicle cargo bay without dominating it. At a quiet campsite running a 12V fridge through a DC-DC charger, lights and phone chargers, the RB3.5 sat in eco mode and never made the load list interesting.
Noise was the only honest compromise. At 66 dB on quarter load it's not loud, but the Hyundai HY3500i at 64 dB and the Briggs P3500 at 62 dB are noticeably quieter when you're sitting 5 m away.
Noise — Honest Numbers
Measured at 7 m on a still morning:
- Quarter load: 66 dB
- Half load: 68 dB
- Full load: 71 dB
That puts the RB3.5 at the louder end of the inverter category, but still meaningfully quieter than any conventional (non-inverter) generator. It's under the 70 dB threshold most campers consider intrusive at quarter load, and under most caravan park noise limits.
Fuel Economy and Run Time
The 5 L tank gives around 6 hours at 25% load, 4 hours at 50% load, and around 3 hours at 75% load. Smaller than the Hyundai's 7 L and the Briggs's 6.5 L, so you'll refuel more often on a long trip. Eco mode helps but doesn't fix the fundamental tank size.
For weekend camping with light loads, the 6-hour run time is fine — a tank gets you through an evening. For full-time caravan use you'll want a bigger tank or a jerry can plan.
The Honest Catches
- 1-year warranty. Briggs gives 2 years, Hyundai gives 3. If you wear out the unit fast, you're not covered as long.
- Louder than the Hyundai and Briggs. 2 to 4 dB — not loud, but noticeable in a quiet campground.
- Smaller fuel tank. 5 L vs 7 L means more refuels on long trips.
- Build feel is lighter (because the unit is lighter). The chassis doesn't have the heft of the Briggs. That's also exactly why it's 16 kg lighter.
Pros and Cons
Pros: Lightest 3.5 kVA on the market, pure sine wave output, electric start, eco mode, half the price of the Briggs P3500, Australian support, easy solo lifting.
Cons: Shorter warranty (1 year), louder under load, smaller fuel tank, less premium build feel.
Who Should Buy the Redback RB3.5
This is the right generator for you if you:
- Need a 3.5 kVA pure sine wave generator but want to keep the price under $1,000.
- Lift the generator in and out of a caravan or 4WD regularly and want a unit you can manage solo.
- Camp every other weekend rather than every weekend.
- Run a smaller caravan AC (under 2 kW) and don't need 4 kVA-plus headroom.
- Value direct Australian support over global brand recognition.
It's not the right generator if you need to run a 2.5 kW AC continuously (step up to the RB4.5 EFI), if you use the generator weekly and need the long warranty (the Hyundai HY3500i or Briggs P3500 are smarter), or if absolute quiet matters more than weight (the Briggs P3500 wins on noise).
Useful Accessories
Two add-ons are genuinely worth it with the RB3.5:
- Custom-fit Redback RB3.5 generator cover — keeps dust and moisture out between trips and prolongs the life of the unit.
- Anti-vibration mat — drops measured noise by 2 to 4 dB and stops the generator walking across hard surfaces.
Both pay for themselves quickly if you camp regularly.
The Verdict — Is the Redback RB3.5 Worth it?
Yes, for the right buyer. The RB3.5 isn't trying to be the best 3.5 kVA generator on the market — it's trying to be the most usable one. At 24 kg and $970 (at the time of writing) it removes both the lifting problem and the price problem that keep many caravan owners away from the category. You give up some warranty, some noise margin, and some fuel range, but you get a generator you'll actually take camping rather than leave at home.
For weekend caravan owners, solo travellers, and anyone who's tired of a 40 kg Briggs ruining their back, the RB3.5 is the realistic 3.5 kVA buy.
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