What size generator do I need for a construction job site?

Most residential construction job sites need a 5,000-10,000 watt generator to run saws, drills, compressors, and lights. Commercial sites often need 10,000-25,000+ watts. Add up the wattage of all tools you'll run simultaneously, then add 20% for startup surge.

How do I calculate what size generator I need?

List every tool and device you need to power. Check the wattage rating on each (check the nameplate or manual). Add up the running watts of everything you'll use at the same time. Multiply by 1.2 for safety margin. That's your minimum generator size.

How much does it cost to rent a generator?

Generator rental costs depend on size. Small portable generators (3,000-5,000W) rent for around $50-$100/day. Mid-size generators (7,000-12,000W) cost $100-$200/day. Large towable generators (25,000W+) can cost $200-$500+/day. Contact Beehive Equipment for current rates.

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Sizing

What Size Generator Do I Need?

Generator sizing guide for different applications and power needs.

6 min read

January 20, 2026

Complete generator sizing and selection guide.

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What Size Generator Do I Need?

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