Versatile and reliable power, when and where you need it

The G25 mobile generator offers contractors and rental houses an excellent power solution. The compact, sound-attenuated model provides single and three-phase power for construction, commercial, industrial and special event applications where quiet, reliable power is needed. A digital controller monitors and protects the generator and engine while providing continuous operating data on an easy to read LCD display. Large capacity fuel tank for long run times and durable features for long life.

  • Ideally suited for construction sites where durability, reliability and flexibility are required to supply continuous power for applications such as lighting, cranes, concrete mixers and conveyor belts.
  • Brushless, oversized alternators with separate excitation winding and AVR (Automatic Voltage Regulation) provide superior motor starting and enhanced ability to run non-linear loads.
  • Single switch start and simple, uncluttered control panel provide unmatched ease of use.
  • Automatic remote start capability standard which is ideal for temporary standby applications.
  • Factory-installed customized options are available. These include, but are not limited to, a fluid containment system, cold weather options, a camlock panel, etc. Also available are optional trailers that are fully equipped and highway ready.


More Models Available At Wacker Neuson


Technical specifications - G25 (T4i)


L x W x H Operating (Skid) in 76.6 x 35 x 44.5
L x W x H Shipping (Skid) in 81 x 37.5 x 56.6
L x W x H Shipping/Operating (Trailer) in 133 x 60 x 69


Weight Dry (Skid) lb 1,911
Weight Operating (Skid) lb 2,332
Weight Shipping (Skid) lb 2,031
Weight Operating (Trailer) lb 2,802
Weight Shipping (Trailer) lb 2,381

Operating data 

Trailer coupling Type 2in Ball
Standby output   kW 20.4
Prime output  kW 19.5
Voltage 3 Phase V 240/480
Current 3 Phase (Prime) A 58/29
Current 1 Phase (Prime) A 120/240
Voltage 3 Phase V 208, 220, 240, 416, 440, 480
Voltage 1 Phase V 120, 127, 139, 240, 254, 277
Circuit breaker (Main) A 70
Frequency  Hz 60
Power factor 1 Phase cos Φ 1~ 1
Power factor 3 Phase cos Φ 3~ 0.8
Sound level (LwA) at Prime (23 ft / 7 m)dB(A) 65
Receptacles -20 Amp GFI Duplex 2
Receptacles -50 Amp Twist Lock 2

Engine / Motor 

Engine / Motor  Liquid-Cooled, 4 Cylinders
Engine / Motor manufacturer  Isuzu
Emissions Certified Tier 4i
Displacement  in³ 133
Operating performance SAE J1995, ISO 8528-1 hp 35.4
at rpm  rpm 1,800
Coolant Capacity US qt 11.9
Engine oil Capacity US qt 8.5
Fuel type  Diesel
Fuel consumption (Prime Load) US gal/h 1.8
Tank capacity -Fuel US gal 58.4
Quantity (Battery) 1
Battery  V 12
Generator model  Mecc Alte, Brushless w/AVR
Voltage control No Load to Full Load +/-% 1
Voltage control Steady State +/- % 0.2
Generator insulation (class)  H
Frequency (Generator Speed) Hz 60
Runtime at 100% Prime Load h 32.2
Runtime at 75% Prime Load h 24.15