Rating Definitions by Kohler

พิกัดแบบสำรองฉุกเฉิน (Standby rating)
applies to installations served by a reliable utility source. Standby power is applicable to
varying loads for the duration of the utility power interruption. There is no overload capability for the standby rating; use of the generator set above the standby rating is prohibited. Ratings are in accordance with ISO 3046/1, ISO 8528/1, BS 5514, AS 2789, and DIN 6271.

The standby rating is applicable to variable loads with an average load factor of x% of the standby rating, with 100% of rating available for the duration of the outage.
See Rating Conditions following for standby rating load factor for each generator set model.

Typical operating time is 200* hours per year or less.
Use the prime power rating for applications exceeding 200 hours of varying load operation.
A typical standby application backs up the normal/reliable utility in the event of emergency power outages

พิกัดแบบต้นกำลัง (Prime power rating)
applies to applications where utility power is unavailable or unreliable. At varying load, the number of generator set operating hours at prime rating is unlimited. Ratings are in accordance with ISO 8528/1 and overload power is in accordance with ISO 3046/1, BS 5514, AS 2789, and DIN 6271.

The prime power rating is applicable for variable loads with an unlimited number of operating hours per year. The average power output shall not exceed x% of the prime power rating. See Rating Conditions following for the prime power rating load factor for each generator set model. Loads of less than 30% shall be counted as 30%.

All models except Waukesha-powered models: A 10% overload power is available for a period of one hour in every 12 hours. This overload cannot exceed 400 hours per year.

Waukesha-powered models: A 10% (rich-burn) or 5% (lean-burn) overload power is available for a period of one hour in every 12 hours.

This overload cannot exceed 730 hours per year.
Typical prime power applications include emergency applications where frequent power outages occur, peak shaving and interruptible rate applications, backup for unreliable utility sources, or as a sole source when a utility is unavailable.

พิกัดแบบต่อเนื่องจำกัดชั่วโมงการใช้งาน (Limited running time rating)
applies to generator sets operating under nonvarying load factors and/or constant dedicated loads for a limited number of hours.

Power is continuously supplied to a constant or nonvarying load up to 100% of the limited running time rating for up to 700 hours a year. No overload capability is available at this rating; therefore, use above the limited running time rating is prohibited.

For operation exceeding 700 hours per year at constant load, use the base load (continuous rating).
Typical limited running time applications include load management, peak shaving, interruptible rate, load curtailment, and cogeneration. Contact a factory representative for generator set limited running time ratings.

พิกัดแบบต่อเนื่อง Base load rating (also referred to as continuous rating)
applies to generator sets operating as utility-type power sources where there are nonvarying load factors and/or constant dedicated loads.

Power is continuously supplied to a constant or nonvarying load up to 100% of the base load rating for an unlimited number of hours. No overload capability is available at this rating; therefore, use above the base load rating is prohibited. Ratings are in accordancewith ISO8528/1, ISO 3046/1, BS 5514, AS 2789, and DIN 6271.

Typical base load applications include utility, base load, main source of electrical power, and cogeneration.