Gorilla Power 3500W Inverter Suitcase Generator - GP3500i - Powerful & Fuel Efficient

Powerful fuel efficient petrol inverter generator

Gorilla Power 3500W Inverter Suitcase Generator - GP3500i - Powerful & Fuel Efficient

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Gorilla Power 3500W Inverter Suitcase Generator - GP3500i - Powerful & Fuel Efficient Gorilla Power 3500W Inverter Suitcase Generator - GP3500i - Powerful & Fuel Efficient £499.00

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The Gorilla Power GP3500i Inverter Generator delivers the perfect balance of portability and power, making it ideal for home backup, camping, caravanning, mobile businesses and professional trade use. Producing 3500W maximum output and 3000W continuous running power, the GP3500i provides ample headroom for larger appliances, power tools and sensitive electronics.

  • 3500W maximum inverter output
  • 3000W continuous running power
  • True sine wave power quality
  • 21.5kg suitcase style design
  • Manual recoil start petrol engine
  • 6 litre fuel tank
  • Runs up to 14 hours in Economy Mode
  • Parallel ready for extra power
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Full Description

The Gorilla Power GP3500i Inverter Generator delivers the perfect balance of portability and power, making it ideal for home backup, camping, caravanning, mobile businesses and professional trade use. Producing 3500W maximum output and 3000W continuous running power, the GP3500i provides ample headroom for larger appliances, power tools and sensitive electronics.

Featuring advanced True Sine Wave Inverter Technology, the GP3500i generates clean, stable electricity that is safe for laptops, televisions, routers, battery chargers and modern electronic equipment. The efficient petrol engine and 6-litre fuel tank provide up to 14 hours runtime at 25% load, while the compact suitcase-style design makes transportation simple.

With low operating noise of approximately 63dB at 7 metres, Economy Mode, low oil protection and parallel capability, the GP3500i is one of the most versatile inverter generators in the Gorilla Power range.

Key Features

  • 3500W maximum output power
  • 3000W continuous running power
  • True sine wave inverter technology
  • Safe for sensitive electronics
  • Up to 14 hours runtime
  • Economy Mode for improved fuel efficiency
  • Parallel-ready for increased output
  • Low oil shutdown protection
  • Quiet operation at approximately 63dB
  • USB charging outputs
  • 12V auxiliary output
  • Compact suitcase-style design
  • Ideal for home backup and mobile power applications

Technical Specifications

Specification Details
Maximum Output 3500W
Running Output 3000W
Fuel Type Petrol
Starting System Manual Recoil
Fuel Tank Capacity 6 Litres
Oil Capacity 0.6 Litres
Runtime Up to 14 Hours @ 25% Load
Frequency 50Hz
Noise Level Approx. 63dB @ 7m
Weight 21.5kg
Parallel Ready Yes
Inverter Type True Sine Wave

Power Output Guide

The GP3500i offers increased output capacity over smaller inverter generators, making it suitable for a wider range of appliances, power tools and backup power applications.

Equipment Typical Running Power Typical Starting Power GP3500i Suitability
Laptop & Phone Charging 100-200W Approx. Same Suitable
LED TV, Router & Lighting 150-250W Approx. Same Suitable
Fridge Freezer 120-200W 800-1200W Suitable
String Trimmer 300-350W 700-875W Suitable
Hedge Trimmer 400-450W 900-1200W Suitable
Drill 500-600W 800-900W Suitable
Hand Sander 500-600W 900-1200W Suitable
Paint Sprayer 500-600W Approx. 600W Suitable
Work Light 300-1000W Approx. Same Check Total Load
Sump Pump (1/2 HP) 700-800W 1200-1300W Suitable
Microwave 800-1200W Approx. Same Suitable
Small Fan Heater 1000-1500W Approx. Same Suitable
Small Electric Pressure Washer 1000-1200W 1800-2400W Usually Suitable
Circular Saw (7¼") 1200-1800W 1800-2400W Usually Suitable
Small Air Compressor 1400-1600W 3500-4500W Check Starting Load
Electric Water Heater 3000-4000W Approx. Same Not Suitable

Guide Only: Add together the running watts of all devices being used simultaneously and ensure the highest starting surge remains within the generator's maximum output capacity.

Sockets & Connections

  • 2 x 240V UK 3-Pin AC Sockets
  • USB Charging Outputs
  • 12V DC Auxiliary Output (5A)
  • Dedicated 5V Auxiliary Output
  • Parallel Connection Ports
  • Grounding Terminal
  • Status Indicator Lights

Why Choose the GP3500i?

The GP3500i sits perfectly between compact inverter generators and larger site generators. It offers significantly more power than entry-level inverter models while remaining lightweight, portable and fuel-efficient.

Its combination of long runtime, clean power output and low noise levels makes it a superb choice for homeowners, campers, mobile businesses and tradespeople requiring dependable portable power.

Ideal Applications

  • Home emergency backup power
  • Camping and caravanning
  • Mobile detailing and valeting businesses
  • Food vans and catering units
  • Construction and trade work
  • Garden and landscaping equipment
  • Outdoor events and festivals
  • Remote working locations
  • Workshop and garage use

HQ Suggests (Tips & Insights)

  • 💡 The GP3500i is an excellent choice for users wanting more power than a 2kW inverter generator without stepping into larger heavy-duty units.
  • 💡 Ideal for running fridges, lighting, routers and essential appliances during power outages.
  • 💡 True sine wave technology makes it safe for sensitive electronics and modern appliances.
  • 💡 Economy Mode can significantly increase fuel efficiency during lighter load operation.
  • 💡 Parallel capability allows future expansion if your power requirements increase.

Why Buy From The Drivers HQ?

The Gorilla Power GP3500i is available from our Derbyshire showroom, where our team can help you choose the right generator for home backup, business, camping or trade use. We offer expert advice, competitive pricing and fast UK-wide delivery across the complete Gorilla Power generator range.

Tracked UK delivery, price shown at checkout.Delivery details

Delivery and collection

Full Delivery Information

Buying for someone? Gift cards from £30, by email or post.Gift cards

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Key features

  • 3500W Output
  • 21.5kg Weight
  • True Sine Wave
  • Manual Recoil Start
  • Parallel Ready

The Drivers HQ

Expert Notes

The GP3500i sits above the GP2000i in Gorilla Power's inverter range, with 3500W of maximum output and 3000W of continuous running power from a petrol engine with true sine wave output. At 21.5kg it keeps the suitcase style portability of the smaller model while giving more headroom for tools, appliances and sensitive electronics together. A 6 litre tank and 0.6 litre oil capacity support runtime of up to 14 hours in Economy Mode, and the manual recoil start keeps operation straightforward. It suits campers, tradespeople and anyone needing a step up in backup power, and pairs well with extension leads, fuel cans and basic maintenance tools rather than larger site equipment.

Perfect For / Suitable Surfaces

  • Home emergency backup power
  • Camping and caravanning trips
  • Mobile detailing and valeting businesses
  • Construction and trade work
  • Garden and landscaping equipment
  • Outdoor events and festivals
  • Workshop and garage use

Caution: Always add up the running and starting watts of everything you plan to connect at once, and run the generator outdoors, well away from windows, doors and vents.

Technical Specifications

Product Type
Petrol Inverter Generator
Brand
Gorilla Power
Weight
21.5kg
Noise Level
Approx. 63dB At 7m
Maximum Output
3500W
Running Output
3000W
Fuel Type
Petrol
Fuel Tank Capacity
6L
Oil Capacity
0.6L
Starting System
Manual Recoil
Runtime
Up To 14 Hours At 25% Load
Sockets
2 x 240V UK 3-Pin AC

How To Use

Using it

  1. Position the generator outdoors on a flat, stable surface.
  2. Check the oil level before starting the engine.
  3. Start the engine using the manual recoil start.
  4. Let the engine settle before connecting any load.
  5. Connect equipment to the 240V AC sockets, USB or 12V DC outputs as needed.
  6. Use Economy Mode to extend runtime on lighter loads.

Cleaning and storage

  1. Let the generator cool fully before you store it.
  2. Wipe down the casing and clear any debris from the vents.
  3. Run the tank low or drain fuel before long periods of storage.
  4. Check and top up the oil before storing if needed.
  5. Store upright in a dry, well ventilated space.

Top Tip: Add up the running watts of every appliance you plan to use together before connecting them to the GP3500i.

Performance Benefits

  • Delivers clean power for electronics
  • Runs up to 14 hours per tank
  • Operates quietly at around 63 decibels
  • Extends runtime in Economy Mode
  • Expands output when linked to a second unit
  • Provides backup power during outages

Frequently Asked Questions

What is the maximum output of the GP3500i?

The GP3500i produces 3500W of maximum output and 3000W of continuous running power, using true sine wave inverter technology that keeps the electricity safe for sensitive devices.

How much does it weigh?

The GP3500i weighs 21.5kg, in a suitcase style case for easier carrying.

What size fuel tank does it have?

It has a 6 litre fuel tank and a 0.6 litre oil capacity.

How long does it run on a tank?

In Economy Mode at 25% load, the GP3500i can run for up to 14 hours.

How do you start it?

The GP3500i uses a manual recoil pull start.

Can it be linked to another generator?

Yes, the GP3500i is parallel ready, so it can be connected to a second compatible Gorilla Power unit for more output.

What connections does it have?

It has two 240V UK 3-pin AC sockets, USB charging outputs and 12V DC auxiliary outputs.

HQ Suggests Tips & Insights

  1. Add up running and starting watts before you connect anything.
  2. Check the oil level before every use.
  3. Always run it outdoors, never indoors or with doors shut.
  4. Use Economy Mode to stretch the fuel tank further.
  5. Let the engine cool before refuelling.
  6. Keep it on a flat, level surface when running.
  7. Store fuel well away from any naked flame.
  8. UK-wide delivery is available from The Drivers HQ.

The Brand

Gorilla Power

Gorilla Power is a range of electric pressure washers and portable generators that sits alongside Kiam Power Products, and its instruction manual names the washer range KIAM Gorilla Power. The washers run from domestic to semi-professional machines, and the generators from a 2000W suitcase inverter for camping and caravans up to 8000W open frame and dual-fuel units for home backup, workshops and building sites.

At The Drivers HQ we stock Gorilla Power online with UK-wide delivery, including the GP6 pressure washer, the GP8 pressure washer and the GP3800iE inverter generator.

Shop all Gorilla Power
Gorilla Power GP6 and GP8 electric pressure washers and GP3500i inverter generator on a black display plinth

Gorilla Power GP6 and GP8 pressure washers

GP6. The GP6 Domestic Electric Pressure Washer is the home and light trade machine: a 2000W carbon brush motor, up to 160 bar and 7 litres a minute, and an 8m hose, with an Auto Stop system that pauses the pump when you let go of the trigger. It suits cars, patios, driveways and garden equipment.

GP8. The GP8 Semi-Professional Electric Pressure Washer steps up to a 3100W induction motor. It is rated at 130 bar and 10 litres a minute, with a maximum of 190 bar and 11 litres a minute, and comes with an 8m high pressure hose, a 5m power cord, a brass turbo nozzle and a foam bottle. It weighs 23.1kg. The extra flow helps with rinsing and with snow foam.

Which one? The GP6 covers most home washing. The GP8's induction motor and higher flow suit people who wash often, foam a lot or clean bigger driveways and patios. Keep the turbo nozzle for hard surfaces and well away from paint.

Shop more pressure washers.

Gorilla Power generators

Gorilla Power generators

Suitcase inverters. True sine wave inverters for clean power to laptops, televisions and battery chargers. The GP2000i gives 2000W maximum and 1800W running and weighs 21kg. The GP3500i gives 3500W maximum and 3000W running, with a 6 litre fuel tank and up to 14 hours runtime. The GP3800iE gives 3800W maximum and 3500W running, with electric, recoil and wireless remote start.

Open frame inverters. The GP5000iE gives 5000W maximum and 4500W running from a 12 litre tank with Economy Mode, and the GP8000iE gives 8000W maximum and 7500W running for home backup, workshops and sites.

Dual fuel. The GP5500E-DF, 5500W maximum and 5000W running, and the GP6500E-DF, 6500W maximum and 6000W running, run on petrol or propane, so you can switch fuel to suit what you have.

Using a generator safely. Run it outdoors with plenty of air so exhaust never reaches enclosed spaces, and let the engine cool before refuelling.

Shop more water tanks, pumps and generators.

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