Generator Power Calculator — Size Your Generator for Inflatable Events

Power Requirements

Number of Blowers

Blower Horsepower

Number of LED Light Sets

Average LED light set uses about 100 watts

Other Equipment (watts)

Speakers, fans, pumps, etc.

Generator Specs

Total Watts Needed

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Recommended Generator —

Total Amperage (120V) —

Circuits Needed —

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How It Works

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Enter Your Equipment

Input the number of blowers, their horsepower, and any additional electrical loads like lights and speakers.

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See Power Needs

Get running watts and startup watts. Blowers draw 50% more power at startup, so the generator must handle that surge without tripping.

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Size Your Generator

The calculator recommends a generator with 20% headroom above your startup watts. This prevents overloading and extends generator life.

Manage Inflatable Events with Reservety

Reservety helps bounce house businesses manage bookings, track equipment, and automate customer communications so events run smoothly every time.

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Frequently Asked Questions

How many watts does a bounce house blower use?

A 1.0 HP blower uses about 900 watts running. A 1.5 HP blower uses about 1,300 watts. A 2.0 HP blower uses about 1,700 watts. At startup, blowers draw 50% more power for a few seconds. This startup surge is what determines your generator size, not the running wattage.

What size generator do I need for 3 bounce houses?

For 3 bounce houses with 1.5 HP blowers, you need about 3,900 watts running and 5,850 watts at startup. A 7,500-watt generator gives you enough power plus headroom for lights and accessories. Never run a generator at more than 80% of its rated capacity for extended periods.

Can I run multiple blowers on one circuit?

A 15-amp household circuit provides about 1,800 watts. A single 1.5 HP blower draws 1,300 watts running, which is already 72% of the circuit capacity. Adding a second blower will trip the breaker. The safe rule is one blower per 15-amp circuit, or two 1.0 HP blowers per 20-amp circuit.