The kilowatt rating shown on a generator is a starting point. To choose a model, first identify what you want to power during an outage or at an off-grid site.
1. List essential loads
List the devices and systems that must run at the same time: heating, ventilation, pumps, refrigeration, lighting, production equipment or servers. Find their power requirements on nameplates or in manuals. Also note the installation voltage and number of phases.
2. Account for starting power
Some motors and compressors need more power at startup than during normal operation. Simply adding their rated power may therefore be insufficient. The order in which equipment starts can also matter.
3. Specify the application
A generator intended for occasional outages and one used as the main power source are selected differently. Ask for the permissible power for your intended use on the specification sheet for the exact generator set, not just its engine.
4. Confirm the configuration
Send your load list, voltage, phases and project address to the team preparing your quote. They can specify power, transfer options, location and installation constraints. For connection to a building, have a qualified professional validate the electrical work.
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