Diesel generators for a 20 kW load
A 20 kW continuous load needs roughly 25 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 20 kW becomes about 25 kVA. Matching a 20 kW load to a 20 kVA set undersizes it by a fifth, which is the most common specification error in this market.
Sets that carry 20 kW
| Model | Prime kVA | Standby kVA | Rated kW | Engine | Phase | |
|---|---|---|---|---|---|---|
| TG27 – TG30S | 27 | 29.5 | 21.6 | Kubota V3300-E2-BG2 | 3 | View → |
| TG30 – TG32S | 30 | 31.4 | 23.3 | Kubota V3300-E2-BG2 | 3 | View → |
| TG40 – TG45S | 40 | 45 | 32 | John Deere 3029TFG20 / 3029TFU20 | 3 | View → |
| TG60 – TG66S | 60 | 66 | 48 | John Deere 3029HFG20 / 3029HFU20 | 3 | View → |
| TGC60 – TGC66S | 60 | 66 | 48 | Cummins 4BTAA3.3-G14 | 3 | View → |
| TG80 – TG88S | 80 | 88 | 64 | John Deere 4045TF220 / 4045TF258R | 3 | View → |
The nearest set below — and when it is the right one
TG22.5 – TG25S is rated 22.3 kVA prime, just under the requirement for 20 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 %.
TG22.5 – TG25S →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 20 kW?
About 25 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 20 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.
Request a quote