Use case
Backup power for a construction site
Jobsite power is dominated by tool motor startup. Stagger heavy tools rather than starting them together, and size for the single largest tool surge.
Running
1,300W
Peak surge
2,900W
Recommend
3,500W
The power tools drives the peak here, surging when it starts. Sizing for the running total plus that single largest surge — not the sum of every surge — gives a realistic 3,500W (3.5kW) recommendation.
Typical loads for a construction site
| Load | Running | Starting |
|---|---|---|
| Power tools | 1000W | 2600W |
| Household lights (LED) | 200W | 200W |
| Phone/laptop charging | 100W | 100W |
Size your exact setup
Common questions
What size generator do I need for a construction site?
For this typical load set, about a 3,500W (3.5kW) class covers it — that's 1,300W running plus the largest startup surge (from the power tools), with a 20% margin.
Can I run more than this?
Yes — this is a representative set. Add or remove loads in the load sizer to match your exact situation and get an updated number.