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Generac iQ3500 Runtime Calculator

Verified Specs ✓

Estimate how long a Generac iQ3500 will run based on your power load and available fuel, using Generac's published specifications as the baseline.

Specifications checked against Generac-published information. GeneratorRuntime.com has not tested this generator and is not affiliated with Generac.

How long does a Generac iQ3500 run?

Generac publishes:

  • 14.1 hours at 25% load · gasoline, 2.6 gallons
  • 8.9 hours at 50% load · gasoline, 2.6 gallons

Actual runtime varies with load and operating conditions.

Calculate Your Runtime

Choose your generator and we'll use verified published specifications as the starting point. We haven't tested these generators ourselves.

1Your generator

Generac iQ3500 with COsense (7723)

Verified Specs ✓

The specifications shown were checked against a manufacturer-published source. This does not mean GeneratorRuntime.com tested or endorses this generator, that the manufacturer endorses this site, or that runtime is guaranteed.

Inverter · View model runtime guide

  • Gasoline
  • 3,000 running watts
  • 3,500 starting watts
  • 2.6 gallon tank

Published runtime:

  • 14.1 hr @ 25% load on 2.6 gal
  • 8.9 hr @ 50% load on 2.6 gal

Source: Generac iQ3500 (7723) spec sheet View source ↗

Checked 2026-09-28

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2Fuel available

Generator tank capacity: 2.6 gal

gal

Pre-filled with a full tank — change it to what you actually have, including stored cans.

3Expected load
%

Percent of running watts. 50% is a common planning figure.

Runtime8–10 hoursDetails ↓

Generac iQ3500 published runtime

Generac's spec sheet for the iQ3500 with COsense (model 7723) lists 14.1 hours at 25% load and 8.9 hours at 50% load on a full 2.6-gallon tank. Because both points are published, loads between 25% and 50% are estimated from Generac's own data.

Verified specifications

Manufacturer
Generac
Model
iQ3500 with COsense
Model number
7723
Model codes
7723-1 / 7723-2 / 7723-3
Generator type
Inverter
Gasoline: running
3,000 watts
Gasoline: starting / max
3,500 watts
Gasoline: tank
2.6 gallons
Gasoline: published runtime
14.1 hours at 25% load on 2.6 gallons
Gasoline: published runtime
8.9 hours at 50% load on 2.6 gallons
Voltage
120V
Frequency
60 Hz
Displacement
212cc
Weight
109.1 lb
Starting system
PowerDial and electric start (battery included)
CO safety
COsense

Source: Generac iQ3500 (7723) spec sheet — View Generac Specifications ↗
Specifications verified: September 28, 2026

How much gas does the Generac iQ3500 use?

  • At 25% load: 2.6 gal ÷ 14.1 h ≈ 0.18 gallons per hour
  • At 50% load: 2.6 gal ÷ 8.9 h ≈ 0.29 gallons per hour

These are our calculations from Generac's published tank size and runtimes, not Generac figures.

Manufacturer figures vs. our estimates

Only the runtimes listed above are Generac's own published figures. When your load and fuel amount exactly match one of them, the calculator labels the result Manufacturer Published Runtime. Loads between published figures are labeled Estimated from Manufacturer Data, and loads outside the published range are labeled Extrapolated with a wider range. Those are GeneratorRuntime estimates, not Generac specifications.

Operate it safely

Like every portable generator, the Generac iQ3500 must be operated according to the manufacturer's safety instructions: outdoors only, well away from doors, windows, and vents, with battery CO alarms inside your home. A CO shutoff feature is not a substitute for safe placement. Never refuel while the engine is running or hot.

Generac iQ3500 FAQ

›How long will a Generac iQ3500 run on a full tank?

Generac's spec sheet lists 14.1 hours at 25% of rated load and 8.9 hours at 50% of rated load on the 2.6-gallon tank.

›What is the Generac iQ3500 runtime at full load?

Generac does not publish a full-load runtime. The calculator extrapolates beyond 50% load and labels those results "Extrapolated" with a wider range.

›How many watts does the Generac iQ3500 produce?

3,000 watts running and 3,500 watts starting, according to Generac.

›Which iQ3500 model does this page cover?

Model 7723 with COsense (configurations 7723-1, 7723-2 and 7723-3). The older model 7127 without COsense is a different configuration and is not covered here.

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