Best 4000w Generator Deals - Top 10 in July 2025

Last Update: 05. July 2025
1
Best Choice
10.0
ALLPOWERS Industrial International Limited

  • [3456Wh large capacity with 4000W high output] The ALLPOWERS R4000 portable power station is equipped with a 3456Wh LiFePO4 safety battery. It has 4* pure sine wave AC outputs (230V 4000W, peak 6000W), 2* 100W USB-C, 4* USB-A output, 1* car cigarette lighter (12V/10A). ALLPOWERS solar generator supports charging household appliances or RV batteries. It is very suitable for emergency power outages at home and long-distance outdoor travel by RV.
  • [Fast charge 100% in 1.2 hours] Thanks to our AP-POWER technology, the R4000 battery can be charged from 0 to 100% in just 1.2 hours. It has three independent sets of solar charging ports, which can charge solar panels of different brands and voltages at the same time, and the total solar charging power is up to 2000W. This unique design can meet the solar charging requirements under different circumstances and can be fully charged within 1.7 hours.
  • [Durable and Safety LiFePO4 Battery] This ALLPOWERS R4000 power station has a LiFePO4 battery. The maximum battery capacity is higher than 80% after 3500 cycles of charging and higher than 50% after 6500 cycles. Therefore, R4000's service life exceeds more than 10 years. The same LiFePO4 battery that is also used in electric vehicles is safe, reliable and non-flammable. It is equipped with three charging modes (Fast Mode/Standard Mode/Silent Mode).
  • [Portable and UPS Function] ALLPOWERS R4000 Portable Solar Generator has an extendable handle and wheels that are perfectly ergonomic and very easy to carry and travel. Equipped with an uninterruptible power supply (UPS), the device automatically switches to the internal battery power supply within 15ms in the event of a power failure or interruption. Ensure the normal operation of CPAP, refrigerators, wine cabinets, servers and desktop computers.
  • [Warranty & Scope of Delivery]1 * ALLPOWERS R4000 Portable Power Station, 1 * AC charging cable, 1 * User Manual.
Colour Brand Weight
Ap-r4000 ALLPOWERS -
£2,39999
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2
Best Value
9.9
EF ECOFLOW
TODAY 38% OFF!
£1,599.00 (38% DISCOUNT!)

  • [Expandable Capacity From 2kWh to 6kWh] Triple the capacity of DELTA 2 Max with up to 2 Extra Batteries. Customize your energy depending on your needs.
  • [0-100% in 1 Hour] Fully charge using an AC outlet in only 81 mins, with the fastest charging tech in the industry. DELTA 2 Max offers an AC input of 2300W using X-Stream. Take advantage of EcoFlow's solar and AC dual charging function to rapidly top up in as fast as 1 hour with an input of up to 2300W.
  • [Upgraded LFP Battery Offers More Than 10 Years of Use] LiFePO4 battery chemistry provides 3000 100% charging cycles till it lowers to 80% capacity. That's 6× more cycles than the industry average and more cost-efficient. DELTA 2 Max also comes with an extended 5-year warranty.
  • [Power 99% of Your Household Devices] Run pretty much any of your home appliances with up to 2400W. With 13 outlets, there's space for any device, and using X-Boost mode, power high-wattage appliances with up to 3100W.
  • [Quiet Charging] With volume levels starting from only 30 dB, DELTA 2 Max is perfect for powering devices overnight without disturbing sleep. Use the EcoFlow app to manage your energy use, set automations, and more.
  • [Compatible with EcoFlow Products] DELTA 2 Max is compatible with EcoFlow’s product ecosystem, providing a one-stop power solution for users. Use DELTA 2 Max with Extra Batteries, Portable Solar Panels, WAVE and WAVE 2 Portable Air Conditioners, Smart Generator, and so much more.
Colour Brand Weight
- EF ECOFLOW 23 kg
£99900
RRP: £1,599.00 -38%
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3
9.8
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
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4
9.7
maXpeedingrods

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
£33999
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5
9.6
United Power Equipment Co.,Ltd

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
£37999
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6
9.5
AIVOLT
TODAY 12% OFF!
£489.99 (12% DISCOUNT!)

FREE delivery**
  • True Sine Wave Power - This inverter generator has a powerful 149cc 4 stroke OHV air-cooled 100% copper winding engine which can produce 3300W maximum watts and 3000W continuous watts steady clean power (less than 3% THD) with very low fuel consumption. Ideal for sensitive electronics such as phones, laptops.
  • Eco Mode & Long Runtime - A fully fueled 4.2L tank will provide you consistent power for up to 8 hours making the generator extremely economical. It runs 4.5 hours at 50% load(1500W), 3 hours at 75% load(2250W), 2.5 hours at 100% load. In Eco-mode, it even runs more time and prolongs generator‘s life. Perfect for camping, RV travel, caravan, motorhome and jobsites.
  • Multifunction Control Panel with 5-in-1 LCD Multi-Meter - The outstanding design features bright orange appearance and multifunctional panel including parallel connectability, 2 standard 230v 3 pin sockets, 2 USB charging ports(type-A & type-C), a 12v DC charging outlet, a digital display meter. Suitable for caravans, lighting systems, car refrigerator and many large outdoor appliances.
  • Ultra Lightweight & Low Noise - Weighs only 23kg, the labor-saving and ergonomic handle is very easy to lift. When the generator is at 25% load, it comes with 61 decibels noise at 23 feet that is comparable to the sound of a normal conversation.
  • The package contains: 1*3300W petrol generator, 1*spark plug wrench, 1*oil funnel, 1*12V DC battery charging cable, 1* screw driver, 1* quick start guide, 1*manual.
Colour Brand Weight
Orange AIVOLT 23 kg
£42999
RRP: £489.99 -12%
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7
9.4
EF ECOFLOW
TODAY 17% OFF!
£599.00 (17% DISCOUNT!)

  • 【Expandable capacity from 1-3kWh】With the standalone portable power station sporting 1kWh, you can add on extra batteries to reach up to 3kWh. Ideal for camping, RVs or off-grid living.
  • 【7x Faster charging】A solar generator that charges fast. Go from 0-80% in 50 minutes. That's ideal when you need home backup power and a quick charge using your wall outlet.
  • 【Power almost anything】Portable batteries have come a long way. Power all your appliances with 1800W output, that's on par with outdoor generators without the fumes or noise. With 13 outlets and its huge output, you can power 90% of your appliances.
  • 【Clean, green charging】With up to 500W of solar panel input, DELTA 2 is a solar generator that can be charged while camping, on an RV trip or off-grid.
  • 【Built to last 6x longer】Its LFP battery chemistry makes for a portable power station with a 3000+ cycle life. Enough for years on end of use. With a sophisticated BMS, you can go easy knowing its auto-regulating to keep you safe.
  • 【Ready for electricity blackout】Ideal for home backup, for refrigerators, heaters, electric blankets, etc. Always ready for power outages.
  • 【What's in the box】EcoFlow DELTA 2 portable power station, AC charging cable, Car charging cable, DC5521 to DC5525 cable, User manual, and an exclusive 5-year warranty.
Colour Brand Weight
Black EF ECOFLOW 12 kg
£49900
RRP: £599.00 -17%
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8
9.3
Impax
TODAY 13% OFF!
£399.99 (13% DISCOUNT!)

  • IMPAX 3500w Inverter Open - Frame Generator; Inverter Open frame generator
  • SPECIFICATIONS: 212 cc, 7HP 4-stroke engine with 3.6kW peak output
  • SPECIFICATIONS: Low noise unleaded, 2x 230V AC 13A output sockets, 1x 12V DC output socket, 1x 5V DC usb
  • Low oil level alarm with automatic engine stop
Colour Brand Weight
Orange/Black IMPAX -
£34999
RRP: £399.99 -13%
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9
9.2
Dealourus

  • 24 Month Warranty - free to call UK/IRE based technical support line extended warranty can be purchased on checkout.
  • Copper Wound Motor - offering maximum unparalleled power and current stability throughout.
  • Dual Electric Key Start & T-MAX EASY Recoil Start
  • Two AC 240V UK 3 Pin Plugs and 12V DC Output
  • 8HP output built along with a silent 69dB Rated Noise Level
  • Free deliver uk mainland & Ireland there will be a surcharge £30 for Scottish islands, isle of man and jersey Guernsey islands
Colour Brand Weight
Copper Dealourus 40 kg
£32999
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10
9.1
maXpeedingrods
TODAY 15% OFF!
£699.99 (15% DISCOUNT!)

FREE delivery**
  • 【App Data Monitor】The MXR4000 portable inverter generator offers a remote monitoring function. The App instantly examines the power output, fuel level, voltage, frequency, single running time, accumulated running time, and other information. You can also switch on/off ECO mode via the App for optimal fuel efficiency.
  • 【Versatile Power Supply】The inverter generator produces 3500 peak watts and 3200 running watts of clean power, ideal for powering high-rated and sensitive electrical appliances. It is also perfect for RV travel, tailgating, camping, parties, gardens, yards, and home backup during power outages.
  • 【Compact Portable Travel Assist】Lightweight design at just 24 KG, equipped with LED lights, making it the perfect addition to any camping or outdoor adventure, you can take it anywhere you want.
  • 【Easy RV Charging】The generator comes with an NEMA L5-30R RV outlet and an adapter, simplifying the charging process so you can charge the RV with ease and convenience. Say goodbye to the stress of RV charging and enjoy carefree travels.
  • 【Brand Warranty】Maxpeedingrods warrants all inverter generators against manufacturing defects under normal use for a period of 2 years from the date of retail purchase by the original end user ("Warranty Period") and provides free lifetime technical support and after-sales service
Colour Brand Weight
- maXpeedingrods 24.6 kg
£59499
RRP: £699.99 -15%
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More information and FAQs about the featured 4000w Generator in this comparison:


Technical Details
Colour -
Brand EF ECOFLOW
Weight 23 kg
Advantages
  • Portable
  • Expandable
  • Fast Charging
  • Versatile
  • Fume-Free
FAQs about ECOFLOW DELTA 2 Max Portable Power Station, Expandable 2-6kWh, LFP Battery 3000 Cycles, AC+Solar 80% Charge in <1Hr, Up to 3100W Output Fume-Free, Quiet Solar Generator for Home Backup, Camping, RVing
What is the capacity of the ECOFLOW DELTA 2 Max Portable Power Station?
The ECOFLOW DELTA 2 Max Portable Power Station has an expandable capacity of 2-6kWh.
How long can the LFP Battery of the ECOFLOW DELTA 2 Max Portable Power Station last?
The LFP Battery of the ECOFLOW DELTA 2 Max Portable Power Station can last for up to 3000 cycles.
How fast can the ECOFLOW DELTA 2 Max Portable Power Station be charged using AC and solar?
The ECOFLOW DELTA 2 Max Portable Power Station can be charged up to 80% in less than 1 hour using AC and solar.
What is the maximum output of the ECOFLOW DELTA 2 Max Portable Power Station?
The ECOFLOW DELTA 2 Max Portable Power Station has a maximum output of up to 3100W, making it suitable for various applications like home backup, camping, and RVing.
Does the ECOFLOW DELTA 2 Max Portable Power Station produce fumes or noise when operating?
No, the ECOFLOW DELTA 2 Max Portable Power Station is fume-free and quiet, making it environmentally friendly and suitable for indoor use.
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 Orange
Brand AIVOLT
Weight 23 kg
Advantages
  • Portable
  • Ultra quiet
  • Pure sine wave
  • Suitable for camping and jobsites
FAQs about AIVOLT 3300W Petrol Inverter Generator 4 Stroke Portable Generator for Camping, Jobsites - Pure Sine Wave, Ultra Quiet-149cc Engine, 4.2L Fuel Tank
What is the maximum power output of the AIVOLT 3300W Petrol Inverter Generator?
The AIVOLT 3300W Petrol Inverter Generator has a maximum power output of 3300W.
Is the generator suitable for camping?
Yes, the AIVOLT 3300W Petrol Inverter Generator is portable and designed for camping purposes.
Does the generator produce pure sine wave power?
Yes, the AIVOLT 3300W Petrol Inverter Generator produces pure sine wave power, making it suitable for sensitive electronic devices.
What is the fuel tank capacity of the generator?
The AIVOLT 3300W Petrol Inverter Generator has a fuel tank capacity of 4.2 liters.
Is the generator engine noisy?
No, the AIVOLT 3300W Petrol Inverter Generator is ultra-quiet during operation.
Technical Details
Colour Black
Brand EF ECOFLOW
Weight 12 kg
Advantages
  • Portable
  • Expandable
  • Fast charging
  • Versatile
FAQs about EcoFlow DELTA 2 Portable Power Station with 1-3kWh Expandable Capacity, LFP Battery, Fast Charging, Use as a Solar Generator for Home Backup Power, Camping & RVs
What is the capacity of the EcoFlow DELTA 2 Portable Power Station?
The EcoFlow DELTA 2 Portable Power Station has a 1-3kWh expandable capacity.
What type of battery does the EcoFlow DELTA 2 Portable Power Station use?
The EcoFlow DELTA 2 Portable Power Station uses an LFP battery.
How fast does the EcoFlow DELTA 2 Portable Power Station charge?
The EcoFlow DELTA 2 Portable Power Station supports fast charging, allowing for quick recharge times.
Can the EcoFlow DELTA 2 Portable Power Station be used as a solar generator?
Yes, the EcoFlow DELTA 2 Portable Power Station can be used as a solar generator for home backup power, camping, and RVs.
Is the expandable capacity of the EcoFlow DELTA 2 Portable Power Station compatible with other EcoFlow products?
Yes, the expandable capacity of the EcoFlow DELTA 2 Portable Power Station is compatible with other EcoFlow products.
Technical Details
Colour Copper
Brand Dealourus
Weight 40 kg
Advantages
  • Portable
  • Electric Key Start
  • Quiet Power
  • Reliable
FAQs about T-MAX Portable Petrol Generator 6000-WE ~ 3.0 KVA 8HP ~ Quiet Power Electric Key Start (Electric Key Start / Recoil Start)
Does the T-MAX Portable Petrol Generator have a recoil start option?
Yes, the T-MAX Portable Petrol Generator comes with both electric key start and recoil start options.
What is the power output of the T-MAX Portable Petrol Generator?
The T-MAX Portable Petrol Generator has a power output of 3.0 KVA (kilovolt-ampere) or 8HP.
Is the T-MAX Portable Petrol Generator quiet?
Yes, the T-MAX Portable Petrol Generator is designed to be quiet during operation.
Does the T-MAX Portable Petrol Generator include an electric key start feature?
Yes, the T-MAX Portable Petrol Generator comes with an electric key start for easy starting.
Can the T-MAX Portable Petrol Generator be used for powering electronic devices?
Yes, the T-MAX Portable Petrol Generator is suitable for powering various electronic devices.

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.