New 400 kVA diesel generators for sale

Buying a new 400 kVA generator

A 400 kVA diesel generator delivers roughly 320 kW at the standard 0.8 power factor. We list 7 new models close to 400 kVA above, so you can compare standby and prime ratings, engines and canopies side by side. Every set is brand new, comes with full specifications and datasheet, and is sold at the best value for money, with lots in stock for fast UK delivery from Crewe.

Is 400 kVA the right size?

Add up the running load of everything the generator must power, allow for motor start-up surges, then leave around 20–25% headroom. If your total sits near 240 kW, a 400 kVA set is usually a good fit. Not sure? Send us your load list or electricity bill and we'll size it for free.

Standby or prime rating?

Standby is for backup during mains failures; prime is for continuous running where there's no grid. Check the prime figure if the 400 kVA generator will be your main power source.

Silent or open?

Silent (acoustic canopy) sets suit outdoor sites near people; open sets suit plant rooms. Ask for an automatic transfer switch if you want the generator to start on its own when the mains drops.