- October 31, 2020
- By: pinnacle
- in: Insight
At Pinnacle, we design our generators to be robust, reliable, and fulfill the anticipated power requirement. Rating aids to this cause. A specific generator set is given one or more ratings by the manufacturer to denote its efficiency.
Based on the operating hours of a generator, there are two categories of ratings.
Standby generator – A specific model of a generator operated for a few hours per year,
Prime power generator – A model of a generator operating continuously.
A standby rating is applicable for emergency power supply throughout the duration of normal power interruption.
These categories of generators are not connected to the grid. Sustained overload capability is unavailable for such DG sets. This rating is equivalent to Fuel Stop Power per ISO3046, AS2789, DIN6271, and BS5514.
Standby rated generators operate in emergency power plants, hospitals, offices, factories, etc.
Prime (Unlimited Running Time) Rating:
Generators are rated such when output is available with varying load for an unlimited time. Hence, the peak demand of prime-rated ekW is 100% with 10% of overload capability for emergency use for a maximum of 1 hour in 12 hours continuous running.
Only specific generator set models are prime-rated. This rating is equivalent to Prime Power per ISO8528 and Overload Power per ISO3046, AS2789, DIN6271, and BS5514.
Prime rated generators operate where the generator is the sole source of power, e.g., remote mining/construction site, fairground, festival, etc. They should not be used for construction power applications.
Another type of rating is the Base Load rating. We must consult the authorized distributor of such generators for the rating.
Base Load (Continuous) Rating:
The Base Load rating is applicable for generators supplying continuous power to a constant load up to the full output rating for unlimited hours.
Sustained overload capability is unavailable for such DG sets.
This rating is equivalent to Continuous Power per ISO8528, ISO3046, AS2789, DIN6271, and BS5514.
A Generator running a continuous unvarying load, or paralleled with the mains and continuously feeding power at the maximum permissible level e.g., 8,760 hours per year is generally given a base load rating.