Stack / iQ3500

Generac iQ3500 (7723, with COsense)

Updated · 22 Oct 2026 · Sheet checked · 22 Oct 2026

It depends — 3,000 W running / 3,500 W starting, 120 V only, electric start, L5-30R not TT-30R; 109.1 lb, no wheels; MSRP from $1,049

For a 120 V electric-start gasoline inverter that holds a fridge, furnace blower, and network gear plus one window AC, and stays parked: 3,000 W running. The 3,500 in the name is starting watts, not what it holds all night.

Exact model 7723 (G0077231): 7723-1 50-state, 7723-2 49-state, 7723-3 49-state/CSA. The older 7127-0 iQ3500 matches on watts, tank, and weight but has no CO sensor. Not the live Honda EU3200i.

What it is

Enclosed inverter generator. Generac 212 cc OHV, carbureted (choke on the PowerDial). Gasoline only, unleaded 87 octane, up to E10, 2.6 gal tank. Electric start with a 12 V 6 Ah lead-acid battery included, recoil backup.

Outlets: one 120 V 20 A duplex (5-20R), one 120 V 30 A L5-30R twist-lock, two 5 V USB-A (1 A / 2.1 A). No 240 V. No 12 V DC. The 30 A outlet is not a TT-30R: an RV cord needs an L5-30P to TT-30R adapter.

109.1 lb dry, 23.7 × 18 × 21.7 in, steel enclosure, no wheels. Floating neutral, THD under 3%, low-oil shutdown. COsense shuts the engine down on rising carbon monoxide. Economy mode. Parallel-ready with Kit #7668 (sold separately).

Noise: Generac's sheet gives no dB figure. Bob Vila measured an iQ3500 (model number not stated) at 56 dB(A) Eco / 61 dB(A) normal, no load, 5 ft. One test, not a rating.

Warranty: 3 years residential, 2 years commercial on the 7723 sheet.

Price: Generac lists MSRP starting at $1,049 for G0077231 on 22 Oct 2026. Links: no affiliate.

What it will actually run

Running watts first: 3,000 W at 120 V (25 A). Surge second: 3,500 W starting, for motor starts only. PowerRush's "over 50% more starting capacity" has no stated baseline; plan from 3,500 W. The manual derates about 3.5% per 1,000 ft of altitude.

Fuel, from Generac's Eco-mode run times on 2.6 gal: 14.1 h at 25% load (750 W), about 0.18 gal/h; 8.9 h at 50% load (1,500 W), about 0.29 gal/h. The owner's manual lists 8.0 h at 50%; plan from 8.0. A 72-hour ice storm is about 13 gal at quarter load and 23 gal at half load (Outage Stack math). No propane option.

Using Outage Stack's size table ranges:

Specs that matter

• Running: 3,000 W @ 120 V (25 A)
• Surge: 3,500 W starting; not continuous
• Outlets: 20 A duplex + 30 A L5-30R + 2 USB-A; no TT-30R, no 240 V
• Fuel: 2.6 gal gasoline, carbureted; 14.1 h at 25% (Eco), 8.0–8.9 h at 50%
• 109.1 lb dry; no wheels

Who should skip it

• You read "3500" as running watts.
• You need 240 V for a well pump, dryer, or interlock.
• You have to lift it alone: 109 lb with no wheel kit on the sheet.
• You want propane for shelf-stable storm fuel; this is gasoline only.
• Weight matters more than 400 W: the live Honda EU3200i lists 2,600 W running at 59.1 lb, recoil only, at a $2,799 MSRP.
• You want dual fuel: the live Champion 201531 lists 3,250 W gas / 2,925 W propane running.

Verdict

It depends. Buy it when the job is a 120 V fridge, furnace blower, and network stack plus one window AC or microwave, you want push-button starts and a CO shutoff, and it lives in one spot. Skip it for 240 V, propane, or one-person carrying: 109 lb with no wheels is a parked generator. Plan from 3,000 W, not 3,500 W.

Sources: Generac — iQ3500 with COsense (G0077231) product page · Generac — iQ3500 7723 spec sheet (Rev. C 05/17/2024) · Generac — iQ3500 7723 owner's manual · Generac — iQ3500 7127-0 spec sheet (2018) · Bob Vila — Best Quiet Generators, tested · Outage Stack — What size generator, Honda EU3200i, Champion 201531 (live peers). Last checked: 2026-10-22.