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dingbo@dieselgeneratortech.com
+86 134 8102 4441
Jul. 21, 2025
Technical data of 20kW/25kVA Cummins Diesel Generator Set
Genset Model: DB-20GF
Rated power:20kW/25kVA
Standby power:22kW/28kVA
Engine: Cummins QSB3.9-G31
Alternator: Shanghai Stamford GR180F
Controller: SmartGen HGM6110CAN-4G-G
| Configuration Features | |
| Engine: Cummins QSB3.9-G31, Meet GB 20891-2014 China Stage III emission requirements | Alternator: Single bearing, IP23 protection, H class insulation. |
| 40/50°C genuine radiator with cooling fan and fan safety guard | Air filter, fuel filter, oil filter |
| Chassis and vibration absorber | Standard control panel (integrated) |
| 24V charging generator | Gas exhaust bellows, gas exhaust elbows, industrial silencers and standard parts for connections |
| Electronic Governor | Accompanying documentation |
| Maintenance-free lead-acid batteries and battery connection cables | |
| Different voltage levels | ||||||
| Voltage (V) | Frequency (Hz) | Phase | Power factor | Current( A) | Standby power | Prime Power |
| 440/254 | 50 | 3 | 0.8 | 33 | 22kW/28kVA | 20kW/25kVA |
| 415/240 | 50 | 3 | 0.8 | 35 | 22kW/28kVA | 20kW/25kVA |
| 400/230 | 50 | 3 | 0.8 | 36 | 22kW/28kVA | 20kW/25kVA |
| 380/220 | 50 | 3 | 0.8 | 38 | 22kW/28kVA | 20kW/25kVA |
Prime power (PRP): According to GB/T 2820 (equivalent to ISO 8528), the generator set can operate unlimited hours within a specified power range, allowing a cumulative 10% overload for 1 hour every 12 hours of operation.
Standby power(ESP): Standby power represents the maximum power limit for emergency use. It shall not be exceeded and is equivalent to the fuel cut-off power.
| Engine Specifications | ||
| Manufacturer & engine Model： | Cummins QSB3.9-G31 | |
| Air intake system: | Turbocharged & Charge Air Cooled | |
| Fuel system： | HPCR | |
| Cylinders no. & Type： | 4 cylinders, in-line | |
| Displacement： | 3.9L | |
| Bore x Stroke： | 102×120mm | |
| Compression Ratio： | 17.3:1 | |
| Engine Speed： | 1500rpm | |
| Engine minimum power： | 25kW / 33hp | |
| Engine maximum power： | 27kW / 36hp | |
| Governor system： | ECU | |
| Noise: | 95dB | |
| Exhaust system | ||
| Exhaust gas flow-standby power： | 4.29kg/min | |
| Exhaust Gas Temperature： | 382°C | |
| Maximum Back Pressure： | 10kpa | |
| Air intake/ Exhaust system | ||
| Maximum Intake Air Restriction: | 5kPa | |
| Inlet air flow-prime power: | 3.22m³/min | |
| Exhaust air flow： | 136m³/min | |
| Fuel system | ||
| Fuel Consumption @ 100% prime power | 210g/kW·h | 6.1L/h |
| Fuel Consumption @ 75% prime power | 219g/ kW·h | 4.8L/h |
| Fuel Consumption @ 50% prime power | 235g/ kW·h | 3.4L/h |
| Lubrication system | ||
| Total system capacity : | 10.9L | |
| Engine Oil Consumption rate： | ≤4g/kwh | |
| Sump oil capacity | 8.9-9.5L | |
| Cooling System | ||
| Total Coolant Capacity: | 21L | |
| Coolant Capacity- engine only | 7.2 | |
| Maximum coolant temperature - engine out: | 99°C | |
| Alternator Specifications | |
| Meet BS5000, VDE0530, NEMA MG1-22, IEC34, CSA C22 and AS1359 standards | |
| Technical Data | |
| Phase： | 3 |
| Wire connecting method： | Y type, 3 phase 4 wire |
| Bearing： | 1 |
| Power Factor： | 0.8 lag |
| Protection: | IP23 |
| Altitude requirements： | ≤1000m |
| Exciter type: | Brushless Self-Excited |
| Insulation/temperature rise class： | H/H |
| Waveform TIF： | <50 |
| Waveform THF： | <2% |
| Rated Capacity： | 20kW/25kVA |
| Efficiency： | 81.4% |
| Genset Technical Specifications | |
| Voltage adjustment rate： | ≥±5% |
| Steady-state voltage regulation rate： | ≤±1% |
| Transient voltage deviation (100% sudden power reduction): | ≤+25% |
| Transient voltage deviation (sudden power increase): | ≤-20% |
| Voltage stability time (100% sudden power reduction): | ≤6S |
| Voltage stability time (sudden power increase)： | ≤6S |
| Frequency adjustment rate: | 0-5% |
| Steady-state frequency band: | ≤1.5% |
| Transient frequency deviation (100% sudden power reduction)： | ≤+12% |
| Transient frequency deviation (sudden power increase)： | ≤-10% |
| Frequency stability time (100% sudden power reduction)： | ≤5S |
| Frequency stability time (sudden power increase)： | ≤5S |
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