Best Portable Generator UK 2026: Inverter and Conventional Picks
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The tool that keeps tools working when there's no mains
On new-build sites, remote properties, outdoor events, or during power cuts, a portable generator is the difference between a productive day and a wasted one. A 2–4 kW inverter generator runs a corded mitre saw, a site lamp, and a kettle at the same time. A bigger one runs a welder and a cement mixer.
This guide covers the best portable generators for UK trade and occasional home use in 2026: inverter generators for clean power sensitive electronics can run on, and conventional generators for straight load capacity.
What to look for
- Inverter vs conventional: Inverter generators produce clean sine-wave power safe for laptops, cordless tool chargers, and sensitive electronics. Conventional generators are cheaper per kW but produce noisier power that can damage sensitive electronics.
- Running wattage: Match to the tools you'll run simultaneously. A mitre saw spikes to 2000 W on startup but runs at 1200 W. Check continuous and peak ratings.
- Fuel type: Petrol is standard, simple, and widely available. Diesel is more efficient for large continuous use but expensive up-front. Dual-fuel (petrol + LPG) gives storage flexibility.
- Noise level: Site-legal generators should be <75 dB(A) at 7m. Inverter generators are significantly quieter than open-frame conventional types.
- Runtime on full tank: 6–10 hours at 50% load is typical for a good inverter. Enough for a full working day without mid-shift refuels.
Top picks: best portable generators UK 2026
Honda EU22i Inverter Generator 2200W
~£1100–£1300Best for: Premium site / sensitive electronics
Honda's EU22i is the reference-standard inverter generator for UK trade. 2200 W peak, 1800 W continuous, true sine-wave power safe for laptops and cordless chargers. Eco-throttle drops engine speed to load. 8-hour runtime at 25% load. Legendarily reliable — Honda's GXR-120 engine will outlast most competitors' whole generators. The industry benchmark.
View on Amazon →Hyundai HY2000Si Inverter Generator 2000W
~£450–£580Best for: Value-for-money inverter
Hyundai's HY2000Si is the 40%-price alternative to Honda's EU22i. 2000 W peak, 1600 W continuous, inverter output, 4-stroke 79cc engine. Not as quiet or as fuel-efficient as Honda but half the price. The pragmatic choice for occasional trade or homeowner power-cut backup.
View on Amazon →Champion 3400W Dual-Fuel Inverter Generator
~£680–£820Best for: Site trade with mid-size loads
Champion's 3400W dual-fuel (petrol + LPG) inverter generator is the right pick when you need more power than a 2200 W unit but still want clean sine-wave output. Runs a mitre saw + table saw + site lights simultaneously. LPG option means you can run off BBQ gas bottles in emergencies.
View on Amazon →Pramac E3200 Open-Frame Petrol Generator 2800W
~£520–£650Best for: Heavy-load trade tools
Pramac's E3200 is open-frame conventional (not inverter). 2800 W continuous, 3.2 kW peak. Cheaper per watt than inverter models and runs heavy mains-power tools without issue (air compressors, welders, concrete mixers). Do not use for laptops or cordless chargers without a surge protector.
View on Amazon →Buying advice
For most UK trade work, Honda EU22i or Hyundai HY2000Si cover 90% of needs — single mitre saw, site lights, kettle, cordless charger, laptop. Step up to the Champion 3400W dual-fuel only if you need to run two larger tools simultaneously or have a welder in the mix.
Always store petrol with a stabiliser if the generator sits unused more than a month — stale petrol is the most common reason a generator won't start when you need it. Drain the tank before long-term storage.
Never run a generator indoors, including garages or sheds with doors open. CO poisoning is a real, measurable killer — keep the generator 6 m+ from any building intake.
Frequently asked questions
Inverter or conventional generator?
Inverter generators produce clean sine-wave power safe for laptops, cordless chargers, and sensitive electronics. Conventional open-frame generators are cheaper per watt and suitable for pure power tools, welders, and heavy loads, but can damage sensitive devices.
What size generator for a mitre saw?
A 2000 W inverter generator (Honda EU22i, Hyundai HY2000Si) handles a single mitre saw with headroom for lights and a cordless charger. For a mitre + table saw or welder, step up to 3000 W+.
Can I run a generator indoors?
No, never. Generators produce carbon monoxide which is odourless and deadly. Always run 6 m+ from any building, doors, or windows. Indoor or garage use has killed people even with doors open. This is non-negotiable safety.