25 kVA Generators

Choosing the Right 25 kVA Generator

A 25 kVA generator sits comfortably in the mid-range of the power spectrum, offering enough capacity for small commercial sites, workshops, and construction projects without the bulk or cost of a larger industrial unit. Like all of our diesel generators, the 25 kVA range is built for dependable, continuous performance. Our 25 kVA silent diesel generator range is designed to deliver this output with minimal fuss, whether you need it for planned standby cover or continuous power on site. As a backup power supply, it’s a popular choice for offices needing power cut protection for lighting, IT equipment, and security systems, making it just as suited as an office backup generator as it is a small business generator for premises that can’t afford downtime.

All units in this range run at a standard 50Hz generators frequency, matching UK grid requirements and those of most international markets, which also makes them straightforward to specify for export projects.

3 Phase and Single Phase Output Explained

Our 25 kVA 3 phase diesel generator models supply a stable 3 phase generator output ideal for machinery, workshop equipment, and larger site installations that require a balanced three phase supply across multiple circuits. For sites running predominantly domestic-style loads, a 25 kVA single phase diesel generator delivers single phase generator output better suited to smaller equipment and standard UK sockets.

Every 25 kVA 3 phase diesel genset and 25 kVA single phase diesel genset in our range can also be paired with an automatic transfer switch, allowing the unit to detect a mains failure and switch to generator power automatically, with no manual intervention required. This is a key consideration for anyone specifying a genset for standby duty, as it ensures continuity of supply the moment it’s needed.

If you’re still deciding between the two, our team can talk you through which output suits your electrical setup, and point you toward our wider range of 3 phase generators and single phase generators.

Engine, Alternator and Control Panel

Every 25 kVA generator in our range is built around a genuine Cummins diesel generator engine, paired with a Stamford alternator for efficient, reliable power conversion, and controlled via a Cummins PowerStart panel for straightforward monitoring and operation. As an authorised Cummins CPG reseller, we offer the UK’s best pricing on Cummins generators, backed by our team’s specialist knowledge of the range. Because we hold genuine stock rather than working from lead times, most Cummins generators are available for fast dispatch rather than a lengthy build-to-order wait.

Silent, Canopied Design

All of our 25 kVA generators are supplied in a silent, canopied configuration, meaning the engine and alternator are fully enclosed within a sound attenuated canopy rather than left exposed on an open skid. This generator canopy soundproofing significantly reduces running noise, making the unit far more practical for use in office car parks, near residential areas, or anywhere noise restrictions apply.

Take a look at our wider range of silent generators if you’re comparing sound-attenuated options across other power sizes, or our open generators range if a lower-cost, non-canopied unit suits your project better.

Sizing, Fuel and Performance

Understanding a generator’s kVA to kW conversion is essential when sizing a unit correctly: kVA measures apparent power, while kW reflects the real, usable power a generator can deliver, calculated using the power factor of the connected load. Our 25 kVA generators are commonly specified as standby generators for short-term or emergency backup, thanks to their generator standby rating, and are equally capable of continuous operation with variable load thanks to their generator prime rating.

Fuel consumption and generator fuel tank capacity are equally important considerations: a well-sized fuel tank reduces refuelling frequency and supports longer generator running hours between visits, particularly useful for unmanned or remote sites. If you’re unsure which size is right for your load, our team can act as your generator sizing guide, helping you avoid under-sizing (which risks overloading) or over-sizing (which wastes fuel and increases upfront cost).

If you’re comparing our full range of gensets across other power ratings, or need slightly more or less output, our 20 kVA generators and 30 kVA generators may also be worth a look.

Frequently Asked Questions

Reserve Your 25 kVA Generator

Our specialist team brings over 50 years of combined experience in the generator industry, and we’re on hand to help you choose, size, and reserve the right 25 kVA generator for your project. Get in touch by phone, WhatsApp, email, or our online enquiry form, and we’ll provide fast, straightforward advice along with generator next day delivery from the UK wherever stock allows, plus efficient global export options.