100kVA Generators
Explore our extensive selection of 100kVA generators at Generator Warehouse, ideal for supporting larger operations, industrial environments, and big events. Each unit offers robust performance, high efficiency, and durable construction to meet the demands of heavy-duty usage. Whether you’re powering a factory floor with our diesel backup generators for business or running a large-scale event with catering generators, our generators are designed to ensure you have the reliable energy supply you needNeed a different capacity? We also stock 80kVA generators for slightly smaller requirements, or 150kVA generators if you need more power. All our standby generators are built for continuous, reliable operation.
100 kVA quick specifications: A 100 kVA diesel generator gives about 80 kW of prime power and around 88 kW on standby. At 400V three phase it supplies roughly 144 amps per phase. Typical fuel use is about 11 to 20 litres an hour depending on load. Sets this size suit commercial premises, medium construction sites, agricultural operations, workshops and small industrial loads. New prices are typically around £12,000 to £18,000 ex VAT, although engine, alternator, canopy, controls and installation affect the final quote.
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100kVA Generators for Sale UK — 100kVA Prime / 110kVA Standby Diesel Generators
Discover the full range of 100 kVA generators available at Generator Warehouse, designed to deliver reliable power for commercial, industrial, and large-scale backup applications. A 100 kVA generator is the perfect solution for businesses that require consistent energy performance to keep operations running smoothly during power cuts or in remote locations. At Generator Warehouse, we stock a wide selection of leading brands including Cummins, Perkins, CAT, and FG Wilson, giving you the confidence of proven engineering and long-lasting durability.
Our 100 kVA generators are available in both open-frame sets and sound-attenuated canopy enclosures, making them suitable for construction sites, warehouses, data centres, events, and critical backup for offices or healthcare facilities. Each generator is built with fuel efficiency, low emissions, and easy maintenance in mind, while offering excellent performance for both prime power and standby power needs.
A 100kVA generator is commonly used for warehouses, offices, construction sites, farms, data centres, events, healthcare facilities, manufacturing units and commercial premises where power continuity is essential. Many models in this range are rated at approximately 100kVA prime power and 110kVA standby power, making them suitable for both regular use and emergency backup, depending on the specification of the individual generator.
Choosing the right 100kVA generator depends on more than the headline kVA rating. You should also consider whether the generator will be used for prime or standby power, the type of equipment being powered, single-phase or three-phase requirements, site access, fuel capacity, noise restrictions, emissions requirements and whether automatic mains failure protection is needed. If you are unsure which generator is right for your application, our experienced team can advise on sizing, specification and suitable options.
Why choose Generator Warehouse for your 100kVA generator?
At Generator Warehouse, we do more than simply supply generators. Every 100kVA generator can be tested before delivery, and our team can advise on the right specification, whether you need a standby set, prime power generator, acoustic canopy, ATS panel, extended fuel tank or bespoke build. As authorised resellers for trusted generator manufacturers, we supply genuine equipment with warranty options depending on the manufacturer, plus finance options to help spread the cost. We can also support nationwide delivery, worldwide export, project-based power solutions, generator hire, servicing, technical support and 24/7 emergency call-out if required.
How much does a 100 kVA generator cost?
Indicative new prices are commonly around £12,000 to £18,000 ex VAT. Engine and alternator brand, acoustic canopy, control panel, fuel tank, delivery, commissioning and installation can all change the final quote.
What are the benefits of a 100 kVA generator for large events?
A 100 kVA generator is ideal for large events such as concerts, festivals, weddings, and outdoor exhibitions. It can provide reliable power for lighting, sound systems, catering, and other event infrastructure. The generator’s capacity ensures that all necessary equipment can run simultaneously without risk of power outages, which is crucial for the success of the event. Additionally, its portability and ease of setup make it a practical choice for event organizers.
How does a 100 kVA generator connect to a building's electrical system?
A 100 kVA generator connects to a building’s electrical system using an automatic transfer switch (ATS). The ATS monitors the main power supply and automatically switches to the generator when it detects a power outage. Once grid power is restored, the ATS switches back to the main supply, ensuring a seamless transition. This setup is particularly useful for businesses and institutions where an uninterrupted power supply is critical, such as data centers, hospitals, and manufacturing plants.
What is the fuel consumption of a 100kVA generator?
Fuel consumption depends on the engine, load, alternator, site conditions and whether the set is running prime or standby duty. As a general guide, many 100kVA diesel generators use around 21–26 litres per hour at full load, around 16–20 litres per hour at 75% load, and around 10–15 litres per hour at 50% load. Always check the individual product datasheet for the exact model.
What can a 100 kVA generator power?
This size is commonly used for commercial premises, medium construction sites, agricultural operations, workshops and small industrial loads. The right choice still depends on the total running load and the starting current of the largest motors or equipment.
Is a 100kVA generator suitable for standby or prime power use?
Yes. A 100kVA generator can be used for:
Standby power – as a backup in case of mains failure.
Prime power – for regular use in off-grid locations (e.g., construction or mining sites).
Make sure the generator model is rated accordingly.
Is a 100kVA generator three-phase or single-phase?
Most 100kVA generators are three-phase, ideal for commercial and industrial use. However, some can be configured for single-phase output if needed.
How loud is a 100kVA generator?
With a soundproof (canopied) enclosure, typical noise levels are:
65–75 dB(A) at 7 metres
This is about the same as background office noise. Open sets are louder and generally used in industrial areas.
However this can really vary depending on the brand and model. We can also customise the canopy to help reduce noise levels.
What are the dimensions and weight of a 100kVA generator?
Approximate figures:
Dimensions: 2.5 – 3.0 metres (L) x 1.0 – 1.2 metres (W) x 1.5 – 1.8 metres (H)
Weight: 1,300 – 1,800 kg
Again, these vary by brand, engine, and canopy design.
Is a 100kVA generator the same as a 110kVA generator?
A generator described as 100kVA / 110kVA usually means it is rated at 100kVA prime power and 110kVA standby power. Prime power is used where the generator may run for longer periods as a main or regular power source, while standby power is intended for emergency backup use during a mains failure. Always check the individual generator datasheet, as ratings can vary depending on the manufacturer, engine and operating conditions.
How many kW is a 100 kVA generator?
At a typical 0.8 power factor, a 100 kVA generator provides about 80 kW of prime power. Standby power is commonly around 88 kW, but the exact rating should be checked on the chosen model’s datasheet.
How many amps does a 100 kVA generator supply?
At 400V three phase, a 100 kVA generator supplies about 144 amps per phase. This is a guide only: a qualified electrician should confirm cable, switchgear and protection sizes for the installation.
How much fuel does a 100 kVA generator use per hour?
A diesel generator of this size typically uses about 11 to 20 litres an hour, depending on load. Treat this as a planning range rather than a model-specific figure and check the selected generator’s fuel-consumption curve for an exact estimate.