How to Choose the Right Generator: kVA/kW, Runtime, and Noise

Reliable power is critical for construction sites, events, and industrial operations. Choosing the right diesel generator is about sizing correctly, ensuring sufficient runtime, and controlling noise levels.

5 key selection criteria

1) Calculate required kVA/kW

• List all loads to be powered.
• Record ratings in W or A from the nameplates.
• Sum total load and account for motor starting currents.
• Add 20–30% margin for start-up surges and future additions.

Note: Approximate kW = kVA × 0.8 (typical power factor).

2) Runtime & fuel tank

Define daily operating hours. Continuous-duty units with larger tanks run 8–12+ hours per fill, minimizing refueling downtime.

3) Noise

Silent (enclosed) generators keep noise below common thresholds (often < 75 dB at 7 m) and are preferred near offices or residential areas.

4) Safe distribution

• Distribution panel for safe power branching.
• Circuit breakers sized for loads and cable lengths.
• Effective grounding and quality cables.

Common applications

• Construction: cranes, pumps, welding, and site lighting.
• Events: sound, lights, kiosks – independent of venue power.
• Backup power: factories, warehouses, and retail during outages.
• Remote sites: off-grid projects needing reliable supply.