20kW 25kkVA Cummins Industrial Generator Set QSB3.9-G31

Generator Set Specifications

Item	Specification
Product Name	20kW 25KVA Cummins Industrial Generator Set QSB3.9-G31
Genset Model	TPD28C5
Engine Model	QSB3.9-G31
Engine Brand	Cummins
Series	DCEC Cummins
Prime Power	25 kVA / 20 kW
Standby Power	28 kVA / 22 kW
Frequency	50Hz
Rated Speed	1500 rpm
Voltage	400/230V
Phase / Wire	3 phase, 4 wire
Power Factor	0.8 lagging
Duty	Prime power
Application	Industrial diesel generator set
Controller Model	DSE4520 MKII recommended
Circuit Breaker	3-pole molded case circuit breaker
Cooling Package	Engine-mounted radiator and fan
Open Type Dimension	1860 x 750 x 1350 mm
Open Type Weight	700 kg
Silent Type Dimension	2250 x 1000 x 1540 mm
Silent Type Weight	1100 kg

Engine Specifications

Item	Specification
Engine Brand	Cummins
Engine Series	DCEC Cummins
Engine Model	QSB3.9-G31
Cylinder Arrangement	4L inline
Displacement	3.9 L
Bore x Stroke	102 x 120 mm
Fuel Consumption	6.1 L/h
Rated Speed	1500 rpm
Aspiration	Turbocharged and charge-air cooled
Cooling System	Water-cooled with radiator
Governor Type	Electronic governor
Fuel System	Electronic diesel fuel injection
Starting System	24V DC electric start
Fuel Type	Diesel

Alternator Specifications

Item	Specification
Recommended Alternator Class	Stamford PI144E equivalent 25kVA brushless alternator
Alternator Rating	25 kVA prime / 28 kVA standby matched output
Alternator Type	Brushless synchronous alternator
Voltage	400/230V
Phase / Wire	3 phase, 4 wire
Frequency	50Hz
Rated Speed	1500 rpm
Power Factor	0.8 lagging
Rated Current	About 36 A at 400V, 3 phase
AVR	Automatic voltage regulator
Voltage Regulation	+/-1% under steady-state load
Insulation Class	Class H
Protection Class	IP23
Winding Pitch	2/3 pitch
Bearing Type	Single bearing
Coupling	SAE direct coupling

20kW 25KVA Cummins Industrial Generator Set QSB3.9-G31 is suitable for farms, small workshops, retail backup power, telecom rooms, water pumps, small warehouses, and light construction sites that need a compact 50Hz diesel generator set.
The TPD28C5 configuration provides 25 kVA / 20 kW prime power and 28 kVA / 22 kW standby power, giving a 10% standby kW reserve for short motor starting, lighting circuits, small pump loads, and emergency backup demand.
The Cummins QSB3.9-G31 engine uses a 4-cylinder inline 3.9L platform, giving this 20kW generator set more industrial engine capacity than many compact light-duty generator packages in the same output range.
Fuel consumption is 6.1 L/h at rated output, equal to about 0.305 L/kWh at 20kW load; for an 8-hour working shift, diesel planning is about 49 L, helping customers estimate daily operating cost before purchase.
The open type generator set footprint is about 1.40 m2 with 700 kg weight, making it easy to install in compact generator rooms, farm utility rooms, small equipment shelters, and mobile power trailers.
The silent type generator set footprint is about 2.25 m2 with 1100 kg weight, giving customers a lower-noise generator set option for shops, farms near residential areas, small offices, and outdoor standby power.
Compared with choosing a 38KVA or 50KVA generator set for a 12kW to 18kW working load, this 25KVA generator set can reduce equipment size, installation space, and fuel storage pressure while still keeping standby reserve.
The recommended DSE4520 MKII DeepSea controller is a practical control solution for compact generator sets, supporting auto-start, engine and alternator monitoring, shutdown protection, and simple daily operation.
The 25kVA brushless alternator configuration with 400/230V, 3 phase 4 wire, 0.8 power factor, AVR voltage regulation, Class H insulation, and IP23 protection supports lighting, small pumps, fans, tools, small machinery, and general backup loads.

Bespoke Manufacturing

Engineered to Your Exact Specifications

From standard backup power to complex multi-megawatt parallel systems, we customize every aspect of your generator set to ensure peak performance in your specific operational environment.

Open Skid Type

Standard configuration for indoor plant rooms. Features a heavy-duty fabricated steel base frame with built-in anti-vibration mounts.

Silent Canopy

Weatherproof and highly sound-attenuated (down to 65dB(A) @ 7m). Built with cold-rolled steel and fire-retardant acoustic foam.

Mobile Trailer

Single or dual-axle designs with mechanical/air brakes and lighting systems. Ideal for mining, construction, and rental applications.

Containerized

ISO standard 20ft/40ft containers for high-capacity units (500kVA+). Offers ultimate protection and simplifies global shipping.

Core Components

Alternator Upgrades

Partnering with Stamford, Leroy Somer, and Mecc Alte. We offer custom configurations including:

PMG Excitation System
IP44/IP55 Protection
Anti-condensation Heaters
Heavy-duty Winding

Intelligent Controllers

Equipped with Deep Sea (DSE), ComAp, or SmartGen modules, enabling advanced power management:

Remote SCADA Monitoring
Auto Mains Failure (AMF)
Multi-unit Synchronization
Cloud-based Diagnostics

Comprehensive Solutions

Beyond hardware, our engineering team provides end-to-end services to ensure your power system integrates seamlessly into your project.

Extreme Climate Prep

Engine water/oil pre-heaters for cold regions, and sand-proof louvers with heavy-duty air filters for deserts.

Parallel & Sync Systems

Design and manufacture of synchronization panels to run multiple generator sets in parallel for large loads.

Custom ATS Panels

Automatic Transfer Switches tailored to your grid voltage, ensuring seamless switching during power outages.

Testing & Certification

Rigorous Factory Acceptance Testing (FAT) with load banks. Support for CE, ISO9001, and SGS third-party inspections.

Open Type

Length (L)

1860 mm

Width (W)

750 mm

Height (H)

1350 mm

Dry Weight

700 kg

Silent Type

Length (L)

2250 mm

Width (W)

1000 mm

Height (H)

1540 mm

Dry Weight

1100 kg

Dimensional & Assembly (DA) Drawing

Available upon request

20kW 25kkVA Cummins Industrial Generator Set QSB3.9-G31

Technical Data Sheet

Generator Set Specifications

Engine Specifications

Alternator Specifications

Engineered to Your Exact Specifications

Open Skid Type

Silent Canopy

Mobile Trailer

Containerized

Core Components

Alternator Upgrades

Intelligent Controllers

Comprehensive Solutions

Extreme Climate Prep

Parallel & Sync Systems

Custom ATS Panels

Testing & Certification

Open Type

Silent Type

Dimensional & Assembly (DA) Drawing

Before confirming this configuration

Get a Custom Quote

Request a quote

20kW 25kkVA Cummins Industrial Generator Set QSB3.9-G31

Technical Data Sheet

Generator Set Specifications

Engine Specifications

Alternator Specifications

Engineered to Your Exact Specifications

Open Skid Type

Silent Canopy

Mobile Trailer

Containerized

Core Components

Alternator Upgrades

Intelligent Controllers

Comprehensive Solutions

Extreme Climate Prep

Parallel & Sync Systems

Custom ATS Panels

Testing & Certification

Open Type

Silent Type

Dimensional & Assembly (DA) Drawing

Before confirming this configuration

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Get a Custom Quote

Request a quote