MACHINE FIELD GUIDE / SIZE THE LOAD, NOT THE ENGINE
Generator hire
Portable and towable diesel generators power construction sites, events, shutdowns and emergency backup. Correct sizing depends on running load, starting current and how critical the supply is.
FIELD PLATE / 15 PUBLISHED SUPPLIER RECORDSMatch the size class to the task, then confirm the exact unit.
Generator size classes.
| Class | Typical work |
|---|---|
| Portable (2–8 kVA) | Hand tools and small site loads. |
| Towable (20–60 kVA) | Site sheds, lighting and small cranes. |
| Large (100–500 kVA) | Construction sites, events and backup supply. |
| Containerised (500 kVA +) | Industrial, mining and shutdown power. |
COMMON USE / 01Construction site power
COMMON USE / 02Emergency and standby supply
COMMON USE / 03Events and temporary facilities
COMMON USE / 04Pumping and dewatering power
QUOTE CHECK
What to specify.
- Connected load in kW and motor starting loads
- Single or three phase, voltage and frequency
- Run hours, fuel autonomy and refuelling
- Distribution boards, cables and earthing
Watch points.
Undersized sets trip on motor start; oversized sets run inefficiently.
Temporary installations need licensed electrical connection and testing.
Noise limits apply in residential areas and at night.
Rates for generator hire vary with size, location, duration, operator arrangement and transport. Read the plant hire cost guide and the wet vs dry hire comparison before comparing quotes, and use the supplier checklist to confirm the details.
FIELD FAQ
Generator hire questions
- What size generator do I need?
- Add the running load of everything connected, then allow for motor starting currents, which can be several times running load. A supplier can size the set from a load list.
- Is fuel included in generator hire?
- Usually not. Some suppliers offer refuelling services. Ask about tank size and run time at your load.
- Who connects a generator to a building?
- A licensed electrician. Connecting to a building's supply needs correct changeover arrangements to protect the network and workers.