- Generators are rated in kVA (apparent power). At a typical power factor of 0.8, usable real power is kVA × 0.8.
- Motors draw 3–6× their running current at start. Size for the largest motor starting while others run, or use soft starters.
- Add 20–25% headroom for growth and to keep the engine in its efficient load band.
- Altitude and high ambient temperature (common in the Gulf) derate output; confirm with the manufacturer curve.
General information, not professional advice. Confirm with the relevant authority or adviser.