20 kVA Generators
Generator Warehouse presents a wide array of 20kVA generators, designed to provide reliable power for larger home backup systems, small industrial facilities, and commercial standby applications. Our selection offers durability, advanced features, and exceptional performance to meet your power demands.
20 kVA quick specifications: A 20 kVA diesel generator gives about 16 kW of prime power and around 18 kW on standby. At 400V three phase it supplies roughly 29 amps per phase. Typical fuel use is about 2 to 4 litres an hour depending on load. Sets this size suit small construction sites, shops, offices, larger homes, events and light industrial equipment. New prices are typically around £5,000 to £10,000 ex VAT, although engine, alternator, canopy, controls and installation affect the final quote.
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20 kVA Generators for Sale
Generator Warehouse presents a wide array of 20kVA generators, designed to provide reliable power for larger homes, small industrial facilities, and commercial applications. Our selection offers durability, advanced features, and exceptional performance to meet your power demands.
A 20kVA generator is a versatile and reliable power solution for both residential and commercial use. At Generator Warehouse, we supply a wide selection of 20kVA diesel generators from leading manufacturers including Stephill and JCB, available in open frame and silent enclosed options.
Popular uses for 20kVA generators include powering retail shops, restaurants, farms, construction sites, workshops, offices, and large homes. They are capable of running multiple systems such as refrigeration units, lighting, air conditioning, IT equipment, and security systems. For businesses that can’t afford downtime, a 20kVA standby generator ensures operations continue smoothly during a power cut.
With both silent canopy generators like the Stephill SSDK20M Super Silent for noise-sensitive environments and open-frame models for industrial sites, you can choose the best setup for your needs. Many 20kVA generators can also be paired with an Automatic Transfer Switch (ATS), allowing for seamless switchover during outages.
At Generator Warehouse, we don’t just supply generators—we also provide professional installation, nationwide delivery, servicing, and after-sales support. Our experienced team is here to help you select the right 20kVA generator for your application at a competitive price.
A 20kVA diesel generator offers excellent fuel efficiency, long-lasting performance, and peace of mind, making it a trusted choice for homes, businesses, and worksites across the UK.
Can a 20 kVA generator support a small business?
A 20 kVA generator is ideal for small businesses, such as retail shops, restaurants, and offices. It can power critical systems like lighting, computers, refrigeration, and heating or cooling systems, ensuring business continuity during power outages. Additionally, it can support security systems, point-of-sale systems, and essential office equipment, minimizing downtime and financial loss during blackouts.
What maintenance does a 20 kVA generator require?
Regular maintenance is key to ensuring the longevity and reliability of a 20 kVA generator. Maintenance tasks include oil and filter changes, checking coolant levels, inspecting fuel systems, and testing batteries. It’s recommended to perform routine checks every 200-300 hours of operation or at least annually. Keeping a maintenance log and following the manufacturer’s guidelines can prevent unexpected breakdowns and costly repairs.
Are 20 kVA generators noisy?
Modern 20 kVA generators are designed with noise reduction in mind. Soundproof enclosures and advanced muffler systems typically keep noise levels between 65-75 decibels, which is comparable to the noise level of a normal conversation. For sensitive environments like residential areas or schools, additional noise-reducing measures can be applied, such as installing the generator away from living areas or adding extra soundproofing materials.
How much does a 20 kVA generator cost?
Indicative new prices are commonly around £5,000 to £10,000 ex VAT. Engine and alternator brand, acoustic canopy, control panel, fuel tank, delivery, commissioning and installation can all change the final quote.
Do you offer installation for 20kVA generators?
Yes, we provide professional installation services. Our team can handle delivery, positioning, cabling, and commissioning to ensure your generator is set up correctly and ready to go.
Can you help me choose the right generator?
Absolutely. Our expert team will assess your power requirements and advise whether a 20kVA generator is the right fit, or if another size would be more suitable.
How long will a 20kVA generator run on a tank of fuel?
This depends on the model, load, and tank size. On average, a 20kVA diesel generator can run between 10–14 hours at 75% load. Specific run times will be provided for each unit.
How many kW is a 20 kVA generator?
At a typical 0.8 power factor, a 20 kVA generator provides about 16 kW of prime power. Standby power is commonly around 18 kW, but the exact rating should be checked on the chosen model’s datasheet.
How many amps does a 20 kVA generator supply?
At 400V three phase, a 20 kVA generator supplies about 29 amps per phase. This is a guide only: a qualified electrician should confirm cable, switchgear and protection sizes for the installation. These sizes can be supplied in single or three phase; as a 230V single-phase unit, the same rating is about 87 amps.
How much fuel does a 20 kVA generator use per hour?
A diesel generator of this size typically uses about 2 to 4 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 can a 20 kVA generator power?
This size is commonly used for small construction sites, shops, offices, larger homes, events and light industrial equipment. The right choice still depends on the total running load and the starting current of the largest motors or equipment.