Chart
Generator motor starting voltage dip curves
Visualize how motor starting kVA, generator size, and acceptable voltage dip interact for backup and industrial generator planning.
Does not size a generator, guarantee motor start, account for controls, or replace manufacturer generator sizing software.
voltage dip curve
Starting kVA and voltage dip bands
The curve concept shows why running kW is not enough when the largest motor must start on generator power.
Running load alone misses transient stress.
Sensitive loads may need tighter recovery.
Method changes inrush shape and torque.
Controls and electronics can drop out before motors fail.
Decision reference
Show transient motor-starting risk before users run generator sizing or motor locked-rotor calculations.
| Curve band | What it shows | Risk cue | Handoff |
|---|---|---|---|
| Running load only | Steady kW or kVA after start | Misses transient dip | Generator sizing calculator |
| Largest motor start | Starting kVA drives transient demand | Excessive dip or failed start | Motor LRA calculator |
| Reduced-voltage starting | Lower inrush band | Torque and control details matter | Motor starting method chart |
| Sensitive load bus | Dip tolerance is tighter | Control dropout | Voltage sag chart |
Use notes
- Use this chart as a planning and conversation aid only.
- Confirm current utility requirements, product markings, manufacturer instructions, and local authority requirements before field work.
- Use the linked calculator or table when the task needs project-specific arithmetic.
Reference sources
Open the underlying public references before treating the chart as project guidance.