Choosing the right generator is the difference between a site that runs smoothly and one that keeps tripping out or burning fuel it doesn't need. Whether you're powering a construction site in Dubai, a standby supply for a building, or a weekend event, sizing comes down to understanding your load.
1. Add up your running load
List every device the generator will power and its running wattage. Add them together to get your total continuous load in kilowatts (kW). Convert to kVA by dividing by the power factor (typically 0.8), so kVA = kW ÷ 0.8.
2. Allow for motor starting
Motors (pumps, compressors, lifts, air conditioning) draw a large surge when they start, often three to six times their running current. Your generator must handle this inrush without stalling or dipping voltage. This is the single most common reason gensets are undersized in the field.
3. Add headroom
Never run a generator at 100% of its rating continuously. Aim for a working load of around 70–80% of the genset's prime rating. This gives you margin for extra tools, protects the engine, and keeps fuel burn efficient.
Typical sizing at a glance
As a rough starting point for UAE projects:
- 10–45 kVA: shops, villas, small events and light tools
- 60–150 kVA: construction sites, workshops and offices
- 200–500 kVA: factories, towers and infrastructure
- 500 kVA+: synchronised sets for large or critical loads
Let us size it for you
The safest approach is to share your equipment list with our team. We size generators for the UAE market every day and will recommend the correct kVA, including starting margins, so you get reliable power without overspending. Contact Collins Equipments for a fast, no-obligation recommendation.
