Key takeaways
- Standby: short-term backup only, not continuous use.
- Prime: variable load, unlimited hours — typical for sites.
- Continuous: constant base load, unlimited hours.
- Using a standby set as a prime mover shortens its life.
Two generators with the same engine can carry very different loads depending on their rating. Choosing the wrong one risks either overload or wasted capacity — and using the wrong rating for the duty can shorten the generator's life.
The three common ratings
- Standby: maximum power for short periods during a mains outage; not for continuous use.
- Prime: variable load for unlimited hours — the usual choice for construction and off-grid sites.
- Continuous: a constant, unchanging load for unlimited hours, such as base-load applications.
Why the rating matters
A standby-rated set used as a prime mover is being asked to do a job it was not designed for. It will run hotter, wear faster and may fail prematurely. Matching the rating to the duty protects your investment and your uptime.
Always tell your supplier how the generator will actually be used — not just the peak load. The duty cycle determines the right rating.
Getting it right
Tell us how the generator will be used — backup only, continuous site power, or a steady base load — and we will specify the correct rating and capacity, whether you are renting or buying.
Frequently asked questions
No — standby-rated sets are designed for short outages only. For continuous or variable site use you need a prime-rated generator. Tell us your duty and we'll specify the right rating.
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