3. Performance and Specifications
21
Engine Power
Note) Ratings Definitions
The power ratings of Emergency Standby and Prime are in accordance with ISO 8528.
Fuel Stop power in accordance with ISO 3046.
Electric power (kWe) must be considered cooling fan loss, alternator efficiency, altitude derating and ambient tempera-
ture.
STANDBY POWER RATING
is applicable for supplying emergency power for the duration of the utility power outage.
No overload capability is available for this rating. A standby rated engine should be sized for a maximum of an 80%
average load factor and 200 hours of operation per year. This includes less than 25 hours per year at the Standby Power
rating.
PRIME POWER RATINNG
is available for an unlimited number of hours per year in variable load application. Variable
load should not exceed a 70% average of the Prime Power rating during any operating period of 24 hours. The Total
operating time at 100% Prime Power shall not exceed 500 hours per year. A 10% overload capability is available for a
period of 1 hour withing a 12 hour period of operation. Total operating time at the 10% overload power shall not exceed
25 hours per year.
Ratings
(kWm/PS)
Gross Engine Output Net Engine Output
Standby Prime COP Standby Prime COP
1,500 rpm
(50 Hz)
875/1,190 790/1,074 560/761 854/1,161 769/1,045 539/733
875/1,190 802/1,090 561/763 854/1,161 781/1,062 540/734
1,800 rpm
(60Hz)
995/1,353 900/1,224 641/872 958/1,303 863/1,174 604/822
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