Portable generation
kW, kVA and power factor: preparing an inquiry
To compare equipment input in watts with an offer in kVA, identify what each figure represents and the power factor that applies to the loads. Nameplate photos are a useful starting point.
A useful relationship with explicit assumptions
kW measures real power; kVA measures apparent power. For a load with known power factor, kW = kVA × PF. An illustrative example: 800 W at PF 0.8 equals 1000 VA, or 1 kVA. The example describes one load; generator selection also requires a review of the other loads and transients.
- Do not assume PF 0.8 or PF 1 for the entire list.
- Retain published real- and apparent-power limits and transient data.
What to send for a power review
- Nameplates with W, VA or A and voltage; documented PF when available.
- Source specifications with original units and conditions.
Planned location and operation
Run a fuel-powered generator outdoors, away from openings, with exhaust directed away from buildings and people. An enclosed tent, garage or equipment room is unsuitable, even with ventilation. An automatic carbon monoxide (CO) shutoff does not permit indoor use.
In the United States, CPSC recommends at least 20 ft (about 6.1 m) from buildings. Also check the manual, air intakes, audience areas and venue rules before choosing a location. In Argentina, check the local equipment version and the jurisdiction’s and venue’s requirements.
Plan for a dry surface and rain protection as specified in the manual, without enclosing the exhaust. Shut down and let the generator cool before refueling. If the site cannot support these conditions or the required breaks, compare another power source.
Never feed building wiring through a wall outlet. If the project requires a transfer system, request an authorized system and review by qualified personnel. That review must cover protection, grounding, neutral configuration and distribution; do not use improvised adapters.
Frequently asked questions
Does 1 kVA always equal 1 kW?
Only when the applicable power factor is 1; an equipment name does not establish that.
Is PF efficiency?
No. It relates real to apparent power; efficiency compares output and input energy or power.
Do amps tell me watts?
Not necessarily. Voltage, system and PF matter; send the complete nameplate before converting.