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Prime vs Standby vs Continuous Generator Ratings Explained
The same generator can carry different ratings depending on how it will be used. Buying on the standby figure for a set that will run all day is a common and expensive mistake.
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Standby
- For emergency backup when the mains fails
- Limited annual running hours
- Not intended for continuous operation or overload
- Gives the highest kVA figure for a given set
Prime
- For sites with no mains, or where the set runs for long periods
- Unlimited running hours at a variable load
- A short overload capability is usually allowed
- Gives a lower kVA figure than the standby rating of the same set
Continuous
- For constant load at a steady level, such as base load plants
- Unlimited hours at a constant output
- Gives the lowest kVA figure of the three ratings
How to Choose
- Estimate the hours the set will actually run each year
- Ask the supplier which rating the quoted kVA refers to
- Choose the rating that matches the real duty, not the headline number
- Plan the service intervals for the duty you choose
Frequently Asked Questions
Can I use a standby-rated generator for prime power?
Not without derating. Ask the supplier for the prime rating of that set, which is lower than its standby figure.
Why do two 500kVA quotes differ in capability?
One may quote the standby rating and the other the prime rating of a set of similar size. Ask which rating applies.
Generators in our store
Real listings with specs. Request a quote or make an offer.
NewCummins 1500 kVA Diesel Generator (New)
LagosAvailable to order
- Rating
- 1500 kVA
- Fuel
- Diesel
- Phase
- 3-phase, 50 Hz
- Enclosure
- Container
UsedCummins 1500 kVA Diesel Generator (Used)
LagosInspection on request
- Rating
- 1500 kVA
- Fuel
- Diesel
- Phase
- 3-phase, 50 Hz
- Condition
- Used
NewPerkins 500 kVA Diesel Generator (New)
LagosAvailable to order
- Rating
- 500 kVA
- Fuel
- Diesel
- Phase
- 3-phase, 50 Hz
- Enclosure
- Canopy
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