Choosing the right generator capacity is the single most important decision when renting power. Undersize it and equipment trips; oversize it and you waste fuel.
Start by adding the running wattage of all equipment, account for the starting (surge) load of motors, then add a 20–25% safety margin.
As a rough guide: small shops need 15–25 KVA, construction sites 50–250 KVA, and factories, hospitals and data centers often 500 KVA and above. Jayco Power sizes it precisely after a quick load assessment.
Frequently Asked Questions
How many KVA do I need for a 5 HP motor?
A 5 HP motor needs roughly 4–7 KVA accounting for starting surge. Always size the generator for the total connected load plus margin.
Written by
Anil Sharma
Chief Engineer, Jayco Power
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