LT-W20GF — 20 kW diesel generator

Reliable industrial power supply with Cummins engine

The LT-W20GF is a 20 kW three-phase diesel generator set designed for industrial and commercial use. It is based on the 4B3.9-G1 engine from Cummins, one of the world's most reliable engine manufacturers — a four-cylinder, water-cooled, direct injection unit with a displacement of 3.9 liters. With its tight voltage and frequency adjustment, it provides a stable 400 V / 230 V output at 50 Hz, making it ideal for construction sites, warehouses, workshops and facilities requiring uninterrupted power supply.

Main benefits

20 kW rated power for industrial and commercial applications
Cummins 4B3.9-G1 engine – globally recognized reliability and easy serviceability
Three-phase four-wire output, 400/230 V – compatible with EU networks and industrial equipment
Voltage regulation ≤ ±1%, frequency regulation ≤ ±1%
Forced water cooling – long-term operation even under demanding conditions
Electric start – fast and reliable starting without manual effort
Low fuel consumption: ≤ 208 g/kW h – low operating costs in continuous use

Technical parameters

Electrical outlet

Rated power	20 kW
Rated output voltage	400 V / 230 V
Rated current	36 A
Rated frequency	50 Hz
Power factor	cos φ = 0,8 (késő)
Rated speed	1,500 rpm
Startup method	Electric start

Voltage and frequency control

Stationary voltage regulation	≤ ±1%
Voltage surge	≤ ±0,5%
Transient voltage adjustment	+20% / −15%
Voltage stabilization time	≤ 1 s
Stationary frequency setting	≤ ±1%
Frequency oscillation	≤ ±0,5%
Átmeneti frekvenciabeállítás	+10% / −7%
Frequency stabilization time	≤ 3 s

Engine — Cummins 4B3.9-G1

Rated power	24 / 27 kW
Number of cylinders	4 (serial)
Bore × stroke	102 × 120 mm
Cylinder capacity	3.9 liters
Engine type	In-line, water-cooled, four-stroke
Combustion mode	Direct injection
Maximum exhaust back pressure	76 Hgmm
Fuel consumption	≤ 208 g/kWh
Cooling mode	Forced water cooling
Lubrication system	Pressure and splash lubrication

Generator and physical data

Number of phases	Three-phase, four-wire
Protection grade	IP21
External dimensions (L × W × H)	1620 × 710 × 1100 mm
mass	710 kg

Features

🟠 Cummins Reliability: A 4B3.9-G1 motor világszerte elismert a tartósságáért és az egyszerű karbantarthatóságáért — az alkatrészek könnyen beszerezhetők. The 4B3.9-G1 engine is recognized worldwide for its durability and ease of maintenance — parts are readily available.
🟠 Stable power supply: Tight voltage and frequency regulation ensures smooth operation of sensitive equipment even under varying loads.
🟠 Permanent water cooling: The forced water cooling system enables long-term, continuous operation even in demanding environments.
🟠 Custom configurations: Sound-absorbing covers, ATS automatic transfer switch and extended fuel tank are also available upon request.

LT-W20GF