LOAD MANAGEMENT

Key questions to help determine generator sizing:

  1. Is the load going to be single phase (1Ø) or 3 phase (3Ø)
  2. What is the voltage required? 120/240, 120/208, 277/480
  3. Do you know how many amps are required?
  4. What is the item you are trying to run? ( motor or pump? What is the Horsepower?)
  5. Is the application Standby, Prime, or Continuous ?
  6. Will multiple items be run at the same time? (resistive, inductive, capacitive, etc)

Sizing Formulas

Single Phase 1Ø Formulas

kW= (volts x amps x Power Factor) ÷ 1000
kVA= (Volts x Amps) ÷ 1000
Amps= (kW x 1000) ÷ (volts x PF) (use if kW is known)
Amps= (kVA x 1000) ÷ Volts (use if kVA is known)

3 Phase 3Ø Formulas

3Ø 3phase kVA x .58 = 1Ø Single Phase kW (+ -)
3Ø 3phase kW x .72 = 1Ø Single Phase kW (+ -)
kW= (1.732 x volts x amps x PF) ÷ 1000
kVA= (1.732 x volts x amps) ÷ 1000
Amps= (kW x 1000) ÷ (1.732 x volts x PF) If kW is known
Amps= (kVA x 1000) ÷ (1,732 x volts) if kVA is known
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