A portable generator is one of those tools you rarely think about until the moment you really need it, on a site with no power, at a job miles from a socket, or at home when the street goes dark. Buy the right one and it quietly does its job for a decade. Buy the wrong one and you end up with something too small to start your biggest tool, too thirsty to run all day, or too loud to use anywhere near people.
This guide covers the best portable generators UK trades and homeowners are buying in 2026, from quiet inverter models for tools and camping through to bigger dual fuel units for serious home backup. First, the part that saves you money and hassle: working out the size you actually need.
Every generator is rated by its power output in watts, and getting this right is the whole game. Too small and it will trip or stall when a motor kicks in. Too big and you have paid for weight, fuel and noise you never use.
The trap most people fall into is looking only at running watts. Anything with a motor, a fridge, a compressor, a table saw, a circular saw, draws a big surge of power for the first second or two as it starts, often two or three times its running figure. Your generator has to cope with that peak, not just the steady draw.
Work it out like this:
As a rough guide for trades and home use: a 2kW inverter runs hand tools, chargers, lighting and a laptop comfortably. Step up to 3kW to 4kW for a larger power tool or a 110V transformer, and to 5kW or more for whole-home essentials in a power cut. Here are our six picks for 2026.
The Honda EU22i is the generator other generators get compared to. It puts out around 2.2kW from a compact, genuinely portable body, runs remarkably quietly at roughly 58 decibels, and delivers the clean, stable inverter power that laptops, phones and modern tool electronics need. Honda's reputation for engines that start first pull and run for years is the real reason trades and caravanners keep buying it. It is the premium choice and priced accordingly, but for anyone who relies on their power being there every time, it earns its keep. Best overall if the budget stretches. Check the current price on Amazon.
Check price on AmazonThe Hyundai HY2000Si is our best value pick, and the reason is simple: it delivers clean 2kW inverter power and one of the longest runtimes in its class from a single tank, at a noticeably lower price than the Honda. Hyundai has become a familiar, well supported name in UK power equipment, with parts and service easy to find. It is light enough to carry, quiet enough for a caravan or a residential job, and produces the safe, stable power sensitive electronics need. For most trades and homeowners this is the sweet spot of price and performance. Check the current price on Amazon.
Check price on AmazonChampion's dual fuel inverter is the pick for anyone who wants flexibility. It runs on petrol for maximum output or LPG for long, low cost, low fuss running, and it produces clean inverter power at a campsite friendly noise level. The dual fuel trick is genuinely useful: gas stores for years without going stale, so a unit kept for occasional or emergency use will start reliably even after months in the shed. Popular with caravanners, campers and anyone who wants a do everything 2kW unit. Check the current price on Amazon.
Check price on AmazonWhen 2kW is not enough, a larger inverter like the P1 Power P4500i steps up to around 4kW while still giving you clean, tool safe power. P1 Power is a UK focused brand with good parts support, and this class of unit is the one to look at if you need to run a bigger power tool, a compressor or a 110V transformer on site, or several things at once at home. You get inverter quality output with real working headroom, and many units in this class add a wheel kit and handle because they are heavier than the little 2kW models. A strong choice for tradespeople who need dependable site power. Check the current price on Amazon.
Check price on AmazonFor whole-home essentials during a power cut, a larger dual fuel open frame generator around 5kW or above is the practical answer. A unit this size will comfortably run a fridge freezer, a gas boiler, lighting, the router and chargers through extension leads, and the dual fuel option means you can keep it fuelled on gas for reliable long term storage. Open frame units are louder and heavier than inverters, so they suit a garden, a yard or an open site rather than a campsite. Never wire one into your home without a proper changeover switch fitted by a qualified electrician. The sensible choice for home resilience. Check the current price on Amazon.
Check price on AmazonNot everyone needs a premium unit. For light, occasional use, powering a few tools at an allotment, topping up on a camping trip, or keeping as an emergency standby, a budget inverter from a brand like Bohmer-AG or SwitZer does the job for far less money. You give away some of the refinement, longevity and quietness of the premium names, and you should treat it as an occasional workhorse rather than a daily site tool, but for the buyer who needs power now and then it is hard to argue with the price. Check the current price on Amazon.
Check price on AmazonThey all make electricity. The honest differences are output, fuel, noise and price.
| Generator | Best for | Standout strength | Watch out for |
|---|---|---|---|
| Honda EU22i | Anyone wanting the best | Reliability and quiet clean power | Premium price |
| Hyundai HY2000Si | Most trades and homeowners | Value and long runtime | 2kW ceiling on output |
| Champion 2000W dual fuel | Camping and caravans | Petrol or gas flexibility | Slightly less peak output on gas |
| P1 Power P4500i | Site power, bigger tools | Higher output, clean power | Heavier, needs wheels |
| Champion open frame dual fuel | Home backup | Runs home essentials | Loud, needs a changeover switch |
| Bohmer-AG or SwitZer | Light, occasional use | Low entry price | Not for daily commercial abuse |
Work through this in order and the decision makes itself:
One last point. The generator keeps the tools running, but the quote is what wins the job in the first place. If your quoting still happens on a pad in the van, see how trades are pricing bigger jobs in our guide to the best cordless power tool combi kits in the UK, then let QuoteSmith turn your next job into a professional quote in minutes.
QuoteSmith helps UK tradespeople create detailed, professional quotes in minutes. Itemised breakdowns, terms and conditions, and your branding on every page. The customer sees a pro before you have even unloaded the van.
Try QuoteSmith NowFor a couple of hand tools, a battery charger and site lighting, a 2kW inverter generator is usually enough. If you are running a larger power tool with a motor, such as a table saw, a compressor or a transformer for 110V tools, size up to 3kW to 4kW so the generator can cope with the surge when the tool starts. Always check the starting wattage of your heaviest tool, not just its running wattage, because motors draw far more power for the first second or two.
For anything with a chip in it, yes. Inverter generators produce clean, stable power that is safe for laptops, phones, chargers and modern tool electronics, and they are much quieter and more fuel efficient because the engine speeds up and slows down to match the load. A cheaper open frame generator is fine for basic resistive loads like heaters and floodlights, but for sensitive electronics an inverter is the safer choice.
A dual fuel generator runs on either petrol or LPG. It is useful because LPG stores for years without going stale, so a generator kept for emergencies will start reliably even after months in the shed, and running costs on gas can be lower. Petrol still gives slightly more power output, so dual fuel gives you the best of both: petrol when you want maximum output, gas for long, quiet, low cost running.
A portable generator can run the essentials during a power cut, such as a fridge freezer, a gas boiler, some lights, the router and phone chargers, typically from a 2kW to 3kW unit run through extension leads. It should never be wired directly into your home wiring without a proper changeover switch fitted by a qualified electrician, because back feeding the mains is dangerous. Always run a generator outdoors, well away from doors and windows, because the exhaust contains carbon monoxide.
Inverter generators are the quiet option, with premium 2kW models running around 55 to 60 decibels at quarter load, about the level of normal conversation. Open frame petrol generators are much louder and better suited to open sites than campsites or quiet streets. If noise matters, for camping, a caravan or a residential street, buy an inverter and check the quoted decibel figure before you commit.
More UK tool and trade buying guides from QuoteSmith.