Best 4000w Generator Deals - Top 10 in September 2025
Last Update: 18. September 2025
1
Best Choice
Our rankings are created by artificial intelligence (AI) from the algorithmic analysis of hundreds of thousands of customer reviews on products, brands, the level of service of the retailers, as well as popularity trends and much more. The ranking reflects our opinion and should be a good starting point for your purchase.
EF ECOFLOW
- [Powerful and Versatile] The EcoFlow DELTA Pro 3 supports 230V voltage and has a 4000W output (6000W with X-Boost) that can power almost of your home appliances.
- [Multiple Charging Methods] Featuring a 4000Wh LFP battery, expandable to 12kWh with extra batteries or Smart Generators to meet your energy needs. With 6 unique charging methods, including AC outlets, solar panels, gas generators, and EV charging piles, you can forget fuel-cost worries.
- [Reliable, Long-lasting Power] The EcoFlow DELTA Pro 3 Extra Battery, made using LFP battery cells, provides 4000 cycles till it reduces to an 80% capacity. That's almost 11 years of regular use. Every battery houses an integrated BMS module to regulate its voltage current, and temperature, keeping it safe, secure, and long-lasting.
- [Uninterrupted Life] With an ultra-fast 10 ms switch-over time, enjoy instant backup for your NAS systems, servers, and entertainment devices. Safeguard against power disruptions and ensure continuous, safe operation. This portable power station is your reliable partner for an uninterrupted life.
- [Explore Power Security] The EcoFlow DELTA Pro 3 Extra Battery features automotive-grade LFP cells and IP65-rated Cell-to-Chassis battery technology, safeguarding battery health and extending lifespan. Experience peace of mind with a 5-year warranty and exceptional customer service, available anytime for any issues.
| Colour | Brand | Weight |
| - | EF ECOFLOW | 51.5 kg |
£4,09800
2
Best Value
Our rankings are created by artificial intelligence (AI) from the algorithmic analysis of hundreds of thousands of customer reviews on products, brands, the level of service of the retailers, as well as popularity trends and much more. The ranking reflects our opinion and should be a good starting point for your purchase.
maXpeedingrods
TODAY 15% OFF!
£999.99
(15% DISCOUNT!)
FREE delivery**
- 【Multifunction Power Supplier】 4 stroke 345cc inverter generator produces 5500W max watts and 5000W running watts. It is easily able to run a huge range of high-power appliances such as 2000W pressure washer, 3000W power tools, an air conditioner with 6000 BTU cooling capacity, refrigerators, kettles, and even more appliances. Or as backup for power outages.
- 【Low noise】When the generator is in ECO mode at 25% load and is 7m away from the generator, the noise level is 62 decibels. which is almost the quietest generator of this rated power. At this noise level, there is little disturbance for users and people nearby. Please note that ambient noise may affect the overall value of the noise of the machine.
- 【Extra Long Runtime】13.5L Large fuel tank capacity, runs 9 hours at 50% load (2500w load). In ECO mode, the runtime can be extended up to 13 hours.
- 【Provide Clean Power】This inverter technology provides more steady power, produces clean power to safely operate and prevent damage to sensitive electronics such as phones, tablets, televisions and computers.
- [Brand Warranty] Maxpeedingrods warrants all the inverter generators against defects in workmanship under normal use for a period of 2 years from the date of retail purchase by the original end-user purchaser ("Warranty Period"), and free lifetime technical support and customer service.
| Colour | Brand | Weight |
| Orange | maXpeedingrods | 52 kg |
£84999
Was: £999.99
-15%
3
Our rankings are created by artificial intelligence (AI) from the algorithmic analysis of hundreds of thousands of customer reviews on products, brands, the level of service of the retailers, as well as popularity trends and much more. The ranking reflects our opinion and should be a good starting point for your purchase.
Aceup Energy 3800 Watt Inverter Generator, Petrol Powered Generator Pure Sine Wave 223cc, EURO-V, CE
United Power Equipment Co.,Ltd
TODAY 7% OFF!
£379.99
(7% DISCOUNT!)
FREE delivery**
- 223cc 4-stroke OHV engine produces 3800 peak watts and 3500 rated watts with recoil start for up to 10 hours at quarter-load on 10 L, 50Hz
- Intelligent gauge keeps track of voltage ,run-time and hertz and track power output, plus feature low oil led and economic mode to save fuel
- Includes two 230V AC outlets, one 12V DC 8.3A outlet and two 5V USB ports; Parallel ready to connect 2 generators for twice the power (parallel kit sold separately)
- This portable generator for camping produces the clean power required by a variety of sensitive electronics such as phones, TV
- All generators are functionally tested in the factory to guarantee quality with CE EURO-V compliant; Backed by a 1 year limited warranty with lifetime technical guidance from experts
| Colour | Brand | Weight |
| Yellow and Black | Aceup Energy | 28 kg |
£35500
RRP: £379.99
-7%
4
Our rankings are created by artificial intelligence (AI) from the algorithmic analysis of hundreds of thousands of customer reviews on products, brands, the level of service of the retailers, as well as popularity trends and much more. The ranking reflects our opinion and should be a good starting point for your purchase.
Hyundai
FREE delivery**
- Hyundai 4000W Petrol 4.0kW / 5kVA Portable Inverter Generator: Providing a convenient and cost-effective source of power, this portable generator is perfect for providing power whilst camping or in a caravan away from mains power or for use in a garden workshop.
- Powerful & Portable Generator: This generator is capable of powering microwaves, hair straighteners, air conditioning units, televisions, small air compressors for inflatable beds, electric heaters, power tools, laptops, lights and much more allowing you to take the modern luxuries from home with you wherever you go.
- Lightweight but Heavy-Duty: Weighing 50kg, this - combined with the folding front, moulded rear soft-grip handle and heavy-duty rear wheels - makes transportation easy, even across rough or uneven surfaces.
- Sine Wave Output For Sensitive Equipment: Producure sine wave output, it can safely power sensitive electronics without the risk of damaging or overloading them.
- Easy To Use Generator: This petrol inverter generator also comes with 2 remote start keys and 2 manual start keys, allowing you to start your generator without going outside your caravan or motorhome - especially handy if it's raining!
| Colour | Brand | Weight |
| Blue | Hyundai | 47 kg |
£84999
5
Our rankings are created by artificial intelligence (AI) from the algorithmic analysis of hundreds of thousands of customer reviews on products, brands, the level of service of the retailers, as well as popularity trends and much more. The ranking reflects our opinion and should be a good starting point for your purchase.
K&S Könner&Söhnen
- The inverter generator runs on both petrol and liquefied gas (propane-butane). The scope of delivery includes a gas hose with a reducer for connection to a gas cylinder according to DIN 477.
- The built-in electronic unit with microprocessor control monitors the operation of the inverter generator and provides a stable output voltage of 230V 50Hz sinusoidal form.
- Soundproof housingpetrol inverter generator provides minimal noise (71 dB Lpa 7 m), comfortable use and convenient transportation and is equipped with transport system for easy handling.
- The generator has the ECONOMY MODE function that reduces fuel consumption by up to 50% and allows using the generator at low loads by reducing engine speed.
- Parallel connection box from Könner & Söhnen KS PU1 enables to pair two inverter generators for double output power receiving.
- The portable generator camping is equipped with LED display, two USB ports 5 V/1 A, 5 V/2.1 A, typical 12 V car socket, ECONOMY MODE switch, operating status indicators, generator parallel connection output for double power receiving
- High-end synchronous alternator with 100% copper winding can withstand maximum loads without any damage to ensure long-term reliable operation of the silent inverter generator
- IMPORTANT: Do not overtighten the gas hose nut — the connection is designed to be secure with minimal tightening. Overtightening may damage the fitting or impair its performance
| Colour | Brand | Weight |
| Blue 4000ieg S | K&S Könner&Söhnen | 40 kg |
£84900
6
Our rankings are created by artificial intelligence (AI) from the algorithmic analysis of hundreds of thousands of customer reviews on products, brands, the level of service of the retailers, as well as popularity trends and much more. The ranking reflects our opinion and should be a good starting point for your purchase.
United Power Equipment Co.,Ltd
TODAY 5% OFF!
£435.99
(5% DISCOUNT!)
FREE delivery**
- 149cc 4-stroke OHV engine produces 3400 peak watts and 3200 rated watts with recoil start for up to 5 hours at half-load on 5L, 50Hz
- Intelligent gauge keeps track of voltage, run-time and hertz and track power output, plus feature low oil led and economic mode to save fuel
- Includes 230V two AC outlets, one 12V DC 8.3A car charger outlet and USB TypeA/C ; Parallel ready to connect 2 generators for twice the power (parallet kit sold separately)
- This portable pure sine wave generator produces the clean power required by a variety of sensitive electronics such as phones, TV; THD＜3%; Fully-enclosed design reduces noice level
- All generators are functionally tested in the factory to guarantee quality with CE, EURO-V compliant; Backed by a 1 year limited warranty with lifetime technical guidance from experts
| Colour | Brand | Weight |
| Yellow and Black | Aceup Energy | 23 kg |
£41419
RRP: £435.99
-5%
7
Our rankings are created by artificial intelligence (AI) from the algorithmic analysis of hundreds of thousands of customer reviews on products, brands, the level of service of the retailers, as well as popularity trends and much more. The ranking reflects our opinion and should be a good starting point for your purchase.
Champion Power Equipment
- The cover protects the generator from dirt and moisture – e.g. rain, etc.
- The cover is suitable for frame generators 2000-4000 watts from Champion
- The hood is made of high-quality material and is therefore particularly robust and durable
- Includes a protective cover for generators
| Colour | Brand | Weight |
| - | Champion Power Equipment | - |
£2699
8
Our rankings are created by artificial intelligence (AI) from the algorithmic analysis of hundreds of thousands of customer reviews on products, brands, the level of service of the retailers, as well as popularity trends and much more. The ranking reflects our opinion and should be a good starting point for your purchase.
K&S Könner&Söhnen
- The built-in electronic unit with microprocessor control monitors the operation of thegenerator and provides a stable output voltage of 230V 50Hz sinusoidal form, which issuitable for the reliable operation of sensitive electronics
- Soundproof housing provides minimal noise (70dB Lpa 7m), comfortable use andconvenient transportation and is equipped with transport system for easy handling.
- The generator has an ATS output for connecting an ATS unit (Automatic TransferSwitch). The ATS unit automatically starts the generator and transfers the load to it when the main power supply is disconnected. The ATS output features an 8-pinconnector for connecting the ATS unit KS ATS 4/25 Petrol.
- The reliable proprietary K&S engine is characterised by increased wear resistance,long-term and stable operation as well as meets all European quality standards,including the latest EUROV emission standards. The ECONOMY MODE reduces fuelconsumption up to 50% at low loads due to reduced engine speed.
- Ergonomic control panel is equipped with 6-in-1 multifunction LED display,ECONOMY MODE switch,typical 12 V car socket, generator parallel connection outputfor double power as well as RESET button for resetting the control system (upontripping of the circuit breaker) and restoring power supply, ATS output.
- Könner & Söhnen petrol inverter generators are equipped with a robustbrushless alternator with 100% copper winding. The high-end compactpermanent magnet alternator is housed in a plastic casing and can withstandmaximum loads without any damage to ensure long-term and reliableoperation of the generator set.
- Control of all main operating status indicators: overload protection, automatic enginestop at low oil level, 6-in-1 multifunction LED display (load, fuel level, frequency,voltage, hour meter), oil level, overload and operation indicators.
- KS PU1 generator parallel connection box from Könner & Söhnen. Parallelconnection of two inverter generators ensures double output power.
| Colour | Brand | Weight |
| Blue4000ie S | K&S Könner&Söhnen | 38 kg |
£76400
9
Our rankings are created by artificial intelligence (AI) from the algorithmic analysis of hundreds of thousands of customer reviews on products, brands, the level of service of the retailers, as well as popularity trends and much more. The ranking reflects our opinion and should be a good starting point for your purchase.
maXpeedingrods
TODAY 15% OFF!
£339.99
(15% DISCOUNT!)
FREE delivery**
- 【Multifunction Power Supplier】4-stroke petrol generator produces 3500W max watts and 3200W running watts. It is easily able to keep the lighting system or a small family house, power air conditioners and many other small appliances such as refrigerators,coffee machine at the same time.
- 【Provide Clean Power】This inverter technology provides more steady power, produces clean power to safely operate and prevent damage to sensitive electronics such as phones, tablets, televisions and computers.
- 【Multi-Function Display】Easy to monitor voltage and frequency power; display remaining fuel, which is suitable for timely fuel change; display cumulative runtime, which is suitable for later generator maintenance; display unique runtime, perfect timer function.
- 【Lightweight and Powerful Motor】Only 26 kg, small and compact, easy to carry, 223 cc OHV motor with two 230 V ports and a 12 V DC connector, provides plenty of power for multiple tasks.
- 【Brand Warranty】 Maxpeedingrods warrants all the inverter generators against defects in workmanship under normal use for a period of 2 years from the date of retail purchase by the original end-user purchaser ("Warranty Period"), and free lifetime technical support and customer service.
| Colour | Brand | Weight |
| Orange/Black | maXpeedingrods | 26 kg |
£28899
Was: £339.99
-15%
10
Our rankings are created by artificial intelligence (AI) from the algorithmic analysis of hundreds of thousands of customer reviews on products, brands, the level of service of the retailers, as well as popularity trends and much more. The ranking reflects our opinion and should be a good starting point for your purchase.
Hyundai
FREE delivery**
- Pure Sine Wave Output: Safely powers sensitive electronics like TVs, laptops, and phones
- Low-Noise Operation: Produces only 59dBA with under 75% load at 7 meters, ideal for quiet environments
- ECO Mode: Increases fuel efficiency, lowers noise, and extends engine lifespan
- Lightweight and Portable: Weighs just 26.5kg, easy to transport and store
- Built-In LCD Display: Monitors voltage, frequency, amps, and hours for safe usage
- Safety Features: Includes overload protection and low oil shutdown
- Versatile Outlets: Two 13A mains sockets and a 12V DC outlet for multiple devices
- Peace of Mind: 3 year Hyundai home-use warranty* / 1 year commercial warranty
| Colour | Brand | Weight |
| Blue | Hyundai | 26.5 kg |
£69999
* the possibly used term "best" etc. refers only to our possibly subjective personal opinion.
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1. The prices shown may have risen since the time we last updated them.
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More information and FAQs about the featured 4000w Generator in this comparison:
Technical Details
| Colour | - |
| Brand | EF ECOFLOW |
| Weight | 51.5 kg |
Our editorial team is currently working on a detailed test of this product. Please check back in a few days.
Technical Details
| Colour | Orange |
| Brand | maXpeedingrods |
| Weight | 52 kg |
Advantages
- Portable
- Silent
- Pure Sine Wave
- Suitable for Camping
FAQs about maXpeedingrods 5500W Portable Inverter Generator Petrol Silent Pure Sine Wave Generator for Camping, RV Travel, Home, or Jobsites
Wie viel Leistung hat der Generator?
Der maXpeedingrods 5500W Portable Inverter Generator hat eine Leistung von 5500 Watt.
Wie laut ist der Generator?
Der Generator bietet eine geräuscharme Betrieb mit einer Lautstärke von weniger als 60 dB.
Ist der Generator tragbar?
Ja, der Generator ist tragbar und kann problemlos für Camping, RV-Reisen, Zuhause oder auf Baustellen verwendet werden.
Ist der Generator für den Betrieb von empfindlichen elektronischen Geräten geeignet?
Ja, der Generator erzeugt eine reine Sinuswelle und ist ideal für den Betrieb von empfindlichen elektronischen Geräten geeignet.
Hat der Generator eine Einheit zum Erzeugen von Wechselstrom?
Ja, der Generator erzeugt Wechselstrom (AC) mit einer reinen Sinuswelle für eine qualitativ hochwertige Stromversorgung.
Technical Details
| Colour | Yellow and Black |
| Brand | Aceup Energy |
| Weight | 28 kg |
Our editorial team is currently working on a detailed test of this product. Please check back in a few days.
Technical Details
| Colour | Blue |
| Brand | Hyundai |
| Weight | 47 kg |
Advantages
- Portable
- Inverter technology
- 3 year warranty
- 4000W power
FAQs about Hyundai 4000W / 4.0kW Powerful and Portable Petrol Inverter Generator, Remote Keyfob & Electric Start, Wheel Kit & Closed Case Design
Is the Hyundai 4000W Petrol 4.0kW / 5kVA Portable Inverter Generator fuel efficient?
Yes, the Hyundai 4000W Petrol 4.0kW / 5kVA Portable Inverter Generator is fuel efficient and designed to provide longer runtime with maximum fuel efficiency.
What is the noise level of the Hyundai 4000W Petrol 4.0kW / 5kVA Portable Inverter Generator?
The generator operates at a noise level of approximately 60 decibels, which is relatively quiet for a generator of its size and power.
Does the Hyundai 4000W Petrol 4.0kW / 5kVA Portable Inverter Generator have electric start?
Yes, the generator is equipped with electric start for easy and convenient starting.
Can the Hyundai 4000W Petrol 4.0kW / 5kVA Portable Inverter Generator power sensitive electronics?
Yes, the generator features inverter technology that produces clean and stable power, making it safe to power sensitive electronics.
What is the warranty period for the Hyundai 4000W Petrol 4.0kW / 5kVA Portable Inverter Generator?
The generator comes with a 3-year warranty, providing peace of mind and protection against any manufacturing defects.
Technical Details
| Colour | Blue 4000ieg S |
| Brand | K&S Könner&Söhnen |
| Weight | 40 kg |
Advantages
- Portable
- Dual fuel
- Electric start
- Silent operation
- Multiple plug sockets
FAQs about Könner & Söhnen KS 4000iEG S portable LPG / petrol inverter generator 4000W, UK Standard Plug & 230V 2 x 13 Amp Plug Sockets, 2 USB ports, electric start dual fuel generator, silent inverter generator
Does the generator have a dual fuel capability?
Yes, the Könner & Söhnen KS 4000iEG S generator can run on both LPG and petrol.
How much power does the generator produce?
The generator has a maximum power output of 4000W.
What type of plugs does the generator have?
The generator comes with a UK Standard Plug and two 230V 13 Amp Plug Sockets.
Is the generator easy to start?
Yes, the Könner & Söhnen KS 4000iEG S generator features an electric start for easy operation.
Is the generator quiet?
Yes, the Könner & Söhnen KS 4000iEG S generator is a silent inverter generator.
Technical Details
| Colour | Yellow and Black |
| Brand | Aceup Energy |
| Weight | 23 kg |
Our editorial team is currently working on a detailed test of this product. Please check back in a few days.
Technical Details
| Colour | - |
| Brand | Champion Power Equipment |
| Weight | - |
Our editorial team is currently working on a detailed test of this product. Please check back in a few days.
Technical Details
| Colour | Blue4000ie S |
| Brand | K&S Könner&Söhnen |
| Weight | 38 kg |
Advantages
- Portable
- Electric start
- Copper winding
- Overload protection
- UK Standard Plug Sockets
FAQs about Könner & Söhnen KS 4000iE S portable petrol inverter generator 4000W, petrol generator with electric start, copper winding, overload and short circuit protection, with UK Standard Plug Sockets
Does the generator have a built-in fuel tank?
Yes, the Könner & Söhnen KS 4000iE S portable petrol inverter generator has a built-in fuel tank.
What is the starting wattage of the generator?
The starting wattage of the Könner & Söhnen KS 4000iE S portable petrol inverter generator is 4000W.
Does the generator have electric start?
Yes, the Könner & Söhnen KS 4000iE S portable petrol inverter generator has electric start functionality.
Does the generator have overload protection?
Yes, the Könner & Söhnen KS 4000iE S portable petrol inverter generator is equipped with overload protection.
Are there UK Standard Plug Sockets on the generator?
Yes, the Könner & Söhnen KS 4000iE S portable petrol inverter generator comes with UK Standard Plug Sockets.
Technical Details
| Colour | Orange/Black |
| Brand | maXpeedingrods |
| Weight | 26 kg |
Advantages
- Portable
- Inverter
- Pure Sine Wave
- Versatile
FAQs about maXpeedingrods 3500W Portable Inverter Generator 4-Stroke Pure Sine Wave Petrol Generator for Camping, RV Travel, Home, or Jobsites
What is the maximum power output of the maXpeedingrods generator?
The maximum power output of the maXpeedingrods generator is 3500W, making it suitable for various applications such as camping, RV travel, home backup, or jobsites.
What type of generator is the maXpeedingrods portable inverter generator?
The maXpeedingrods generator is a 4-stroke pure sine wave petrol generator, which ensures stable and clean power output for sensitive electronic devices.
Is the maXpeedingrods generator suitable for camping?
Yes, the maXpeedingrods generator is suitable for camping as it provides portable power for various camping appliances and devices.
Does the maXpeedingrods generator have a compact design?
Yes, the maXpeedingrods generator features a portable and compact design that allows for easy transportation and storage during camping trips or other outdoor activities.
Can the maXpeedingrods generator be used for home backup?
Yes, the maXpeedingrods generator can be used for home backup to provide power during emergencies or power outages.
Technical Details
| Colour | Blue |
| Brand | Hyundai |
| Weight | 26.5 kg |
Our editorial team is currently working on a detailed test of this product. Please check back in a few days.
General information you should know about 4000w Generator:
Are you in need of a reliable power source for your outdoor adventures or emergency backup? Look no further than the mighty 4000W generator. In this product comparison, we will explore the numerous benefits and features of a 4000W generator, aiming to help you make an informed decision and ultimately persuade you to purchase one of these powerful machines.
A 4000W generator is a versatile and efficient device that provides a stable power supply wherever you go. Whether you're camping in the wilderness or experiencing a power outage at home, this generator has got you covered. With a capacity of 4000 watts, it can power a wide range of appliances and tools, including refrigerators, air conditioners, power tools, and more. Its impressive power output makes it suitable for both residential and commercial use.
One of the key advantages of a 4000W generator is its portability. Most models come with wheels and a handle, allowing you to effortlessly transport it from one location to another. This is especially beneficial for camping trips or outdoor events where mobility is crucial. Despite its compact size, it packs a punch when it comes to power generation.
Furthermore, a 4000W generator typically features multiple outlets, enabling you to connect several devices simultaneously. This is particularly useful during emergencies or outdoor gatherings when you need to power multiple appliances or charge various devices at once. Additionally, some models offer USB ports for convenient charging of smartphones, tablets, or other electronic gadgets.
Safety is always a top priority, and 4000W generators are designed with this in mind. Most models incorporate advanced safety features such as automatic voltage regulation, low-oil shutdown, and overload protection. These features not only prevent damage to the generator but also safeguard your connected devices from potential electrical hazards.
In conclusion, a 4000W generator is a reliable and powerful companion for your outdoor adventures or emergency backup needs. Its versatility, portability, and safety features make it an excellent investment for both residential and commercial use. So why wait any longer? Make the wise choice and purchase a 4000W generator today to ensure a stable power supply wherever you go. Power up and enjoy peace of mind with this essential device.
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