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Power calculation

Kilovolt Ampere (kVA) Conversion Ampere (I)

Phase selection 1, 2, 3 Generator (kVA) Voltage requirements = Current (I)

Kilovolt amps to kilowatts

KVA = KW

Kilowatts to kilovolt amps

KW = KVA

Kilowatts to horsepower

Kilowatt (kW) = Horsepower (HP)

Generator capacity required for direct start (DOL) three-phase motors

Motor horsepower (HP) = Required generator capacity (KVA)

Demand for generator capacity by starting load

Note: Just fill in the data in the blue area in the table below.
1. Fill in the horsepower (HP) of each motor starting line by line according to the starting sequence of the motor. (If starting all at once, add all the horsepower.)
2. Select the method for each startup (direct startup or step-down startup).
3. Press the "Calculate" key.
The generator capacity you need will be displayed in the column.

3 phases (415 volt @ 50Hz)
Single phase (240 volt @ 50Hz)
Boot sequence Motor horsepower (HP) Start way
Direct Start / Buck Start
Operational change Phase current Startup ratio Total operating current Required starting current
1 /
2 /
3 /
4 /
5 /
6 /

Generator capacity required for startup: kVA *
Generator capacity required for operation: kVA *
Required generator set capacity: kVA *
kVA Generator Size for Starting with: kVA *
kVA Generator Size for Running with: kVA *
kVA Generator Size recommended: kVA *

* Note: The above calculation is only a rough estimate, because there are many factors that have not been considered. Such as: use environment, motor efficiency, and heat loss.

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