400kVA Generators for Sale
A 400kVA generator delivers approximately 320kW of power – a popular capacity for medium-sized commercial and industrial applications including warehouses, office buildings, hotels, healthcare facilities, and manufacturing plants requiring dependable standby power or prime power solutions.We supply 400kVA diesel generators from FG Wilson, Perkins, Cummins, and CAT, all available from our UK headquarters with fast dispatch nationwide and international shipping.
400 kVA quick specifications: A 400 kVA diesel generator gives about 320 kW of prime power and around 352 kW on standby. At 400V three phase it supplies roughly 577 amps per phase. Typical fuel use is about 44 to 80 litres an hour depending on load. Sets this size suit data centres, hospitals, large industrial plants, major events and other critical power applications. New prices are typically around £38,000 to £58,000 ex VAT, although engine, alternator, canopy, controls and installation affect the final quote.
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400 kVA Generators for Sale
We have all major brands available from our UK Headquarters. 400kVA Generators for sale, whether that be FG Wilson, Perkins, or Cummins Generators. Get in touch with our expert sales team for more information.
A 400kVA generator provides substantial power output for large-scale commercial operations, industrial manufacturing facilities, hospitals, data centres, hotels, shopping centres, and major construction projects. These heavy-duty diesel sets deliver reliable performance for both mission-critical standby backup and continuous prime power generation. At Generator Warehouse, we stock premium 400kVA models from the industry’s most trusted manufacturers, all available with full technical support and nationwide service.
Our 400kVA diesel generators are available in both soundproofed canopy enclosures for urban installations and noise-controlled environments, and open-frame configurations for industrial sites where acoustic performance isn’t a priority. Each unit can be specified with automatic transfer switching, synchronisation for parallel operation, remote monitoring capabilities, and advanced load management systems to ensure seamless integration with your existing electrical infrastructure.
Built to deliver consistent performance under the most demanding conditions, 400kVA generators are commonly deployed in healthcare facilities requiring uninterrupted power, manufacturing operations that can’t afford downtime, large commercial properties needing comprehensive business continuity protection, and construction sites requiring robust temporary power solutions. They offer excellent fuel efficiency, low emissions compliance, and straightforward maintenance requirements for both standby and continuous operation.
At Generator Warehouse, we provide complete project support from initial consultation through to commissioning and beyond. This includes expert technical specification, competitive pricing on all major brands, nationwide delivery and professional installation, comprehensive commissioning services, and ongoing maintenance support. Our experienced technical team will work with you to assess your load profile, runtime requirements, fuel infrastructure, and site constraints to recommend the most suitable 400kVA diesel generator for your specific application.
What industries benefit most from 400 kVA generators?
400 kVA generators are widely used in industries such as manufacturing, telecommunications, hospitality, and large-scale event management. They provide reliable backup power for factories, ensuring that production lines continue operating during outages. In telecommunications, they ensure that networks and data centres remain online. Hotels and large event venues use 400 kVA generators to maintain comfort and services for guests during power disruptions. Smaller venues may find a 250kVA or 300kVA generator sufficient, while larger operations often require 500kVA or 600kVA generators.
Can a 400 kVA generator support a data centre?
Yes, a 400 kVA generator is well-suited for data centres, providing stable and uninterrupted power for servers, networking equipment, and cooling systems. In data centres, any power disruption can lead to significant data loss and downtime, so having a reliable backup generator is essential. Additionally, data centres often use multiple generators in parallel for added redundancy, ensuring that power is continuously available even during maintenance or in case of generator failure. Larger data centres may require 800kVA, 1000kVA, or even 1500kVA to 3000kVA generators.
How much fuel does a 400 kVA generator use per hour?
A diesel generator of this size typically uses about 44 to 80 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.
What type of businesses or applications is a 400kVA generator suitable for?
400kVA generators are ideal for large industrial facilities, construction sites, hospitals, data centres, mines, and manufacturing plants, or anywhere a reliable high-capacity backup or prime power source is required. For smaller commercial premises, a 150kVA or 200kVA generator may be more appropriate.
Do you offer both standby and prime-rated 400kVA generators?
Yes, Generator Warehouse supplies 400kVA generators rated for both standby (emergency use) and prime (continuous or variable load) power applications. Speak to our team to determine which rating best suits your needs. We offer standby and prime options across our full range, from 100kVA through to 1250kVA generators.
Are your 400kVA generators diesel or gas-powered?
Most 400kVA generators supplied by Generator Warehouse are diesel-powered, due to their reliability, fuel efficiency, and widespread use in industrial settings.
Can I get a 400kVA generator with an acoustic canopy or weatherproof enclosure?
Absolutely. We offer sound-attenuated (silent) and weatherproof canopies to ensure your generator runs quietly and is protected from the elements, making it suitable for outdoor installation. Silent canopy options are available across our range, from compact 20kVA generators to larger 700kVA and 900kVA units.
What are the typical dimensions and weight of a 400kVA generator?
While dimensions can vary by model, a 400kVA diesel generator with canopy typically measures around 4.5m (L) x 1.6m (W) x 2.3m (H) and weighs approximately 4,500–5,500kg. Open (non-canopied) sets will be smaller and lighter.
Do you offer delivery and installation services for 400kVA generators?
Yes, we provide nationwide delivery and can arrange professional installation, commissioning, and ongoing maintenance support through our certified engineers.
How many kW is a 400 kVA generator?
At a typical 0.8 power factor, a 400 kVA generator provides about 320 kW of prime power. Standby power is commonly around 352 kW, but the exact rating should be checked on the chosen model’s datasheet.
How many amps does a 400 kVA generator supply?
At 400V three phase, a 400 kVA generator supplies about 577 amps per phase. This is a guide only: a qualified electrician should confirm cable, switchgear and protection sizes for the installation.
How much does a 400 kVA generator cost?
Indicative new prices are commonly around £38,000 to £58,000 ex VAT. Engine and alternator brand, acoustic canopy, control panel, fuel tank, delivery, commissioning and installation can all change the final quote.
What can a 400 kVA generator power?
This size is commonly used for data centres, hospitals, large industrial plants, major events and other critical power applications. The right choice still depends on the total running load and the starting current of the largest motors or equipment.