Diesel generators for a 400 kW load
A 400 kW continuous load needs roughly 500 kVA at the prime rating. These are the sets in the Tom Generators range that carry it, smallest first — with the engine and alternator on each, because those are the facts a buyer verifies.
How this list was sized
Genset catalogues publish kVA; a load is stated in kW. At a 0.8 power factor, kVA ≈ kW ÷ 0.8 — so 400 kW becomes about 500 kVA. Matching a 400 kW load to a 400 kVA set undersizes it by a fifth, which is the most common specification error in this market.
Sets that carry 400 kW
| Model | Prime kVA | Standby kVA | Rated kW | Engine | Phase | |
|---|---|---|---|---|---|---|
| TG500 – TG550S | 500 | 550 | 400 | Cummins KTA19-G4 | 3 | View → |
| TGC640 – TGC700S | 640 | 700 | 512 | Cummins VTA28-G5 | 3 | View → |
| TGC800 – TGC865S | 800 | 865 | 640 | Cummins QSK23-G3 | 3 | View → |
| CTG1000 – CTG1100S | 1000 | 1100 | 800 | Cummins KTA38-G5 | 3 | View → |
| CTG1250 – CTG1375S | 1250 | 1375 | 1000 | Cummins KTA50-G3 | 3 | View → |
| CTG1500 – CTG1650S | 1500 | 1650 | 1200 | Cummins KTA50-GS8 | 3 | View → |
The nearest set below — and when it is the right one
TG410 – TG450S is rated 410 kVA prime, just under the requirement for 400 kW. It is the correct choice only if the real continuous load is lower than the headline figure — measured demand rather than the sum of nameplates. If in doubt, size up: a set running at its limit all day ages faster than one running at 70 %.
TG410 – TG450S →Prime or standby — read the right number
Standby (ESP) is emergency cover with limited hours per year. Prime (PRP) is continuous duty as the main supply. In Ukraine a set is typically the working-day supply rather than emergency cover, so the prime figure is the one to size against — the standby number will flatter the set and shorten its life.
Questions about this rating
What size generator do I need for 400 kW?
About 500 kVA at the prime rating, because kVA ≈ kW ÷ 0.8 at a 0.8 power factor. Size against prime, not standby, if the set runs through the working day.
Is the prime or the standby rating the one that matters?
Prime (PRP) for continuous duty as the main supply; standby (ESP) only for emergency cover with limited annual hours. Sizing a continuous load against a standby number is the recurring error.
How much does a 400 kW generator cost?
Prices are not published because the set is quoted per specification — phase, canopy, ATS, fuel tank and delivery point all change it. Send the load and the site through the quote form for a figure against a named model.
Can it run as the main supply rather than backup?
Yes — that is exactly what the prime rating is for, and it is the normal Ukrainian case. Confirm the fuel arrangement and the service interval for the running hours you expect.
Other power ratings
Get this specified
A genset is quoted per specification — rating, phase, canopy, ATS, fuel tank and delivery point. Send the load and the site, and the quote comes back with the model named.
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