The iQ3500 puts out 3,000 W continuously and up to 3,500 W for a few seconds when a motor starts. It runs up to 8.9 h at 50% load on a full 2.6 gal10 L tank. It weighs 109.1 lb49.5 kg. It takes 0.6 qt0.6 L of engine oil, and the source recommends 10W-30 or SAE 30. The spark plug is F7TC, F7RTC or NGK BPR6ES, gap 0.024–0.028 in (0.6–0.7 mm).
Specifications
Units: /| Power | |
|---|---|
| Running output | 3,000 W 1 |
| Starting output | 3,500 W 1 |
| Voltage | 120 V 1 |
| Inverter (clean power for electronics) | Yes 1 |
| Engine | |
| Engine | OHV 1 |
| Displacement | 212 cc 1 |
| Fuel | Unleaded gasoline, 87 octane minimum 2 |
| Starting | Electric start, with recoil as backup 1 |
| Fuel and run time | |
| Tank | 2.6 gal10 L 1The owner's manual gives 2.64 gal (10 L). |
| Run time | 8.9 h 1at 50% load14.1 hours at 25% load. The 2018 owner's manual gives 8.0 hours at 50% load. |
| Size and noise | |
| Weight | 109.1 lb49.5 kg 1 |
| Length × width × height | 23.7 × 18 × 21.7 in601 × 457.6 × 552.4 mm 1 |
| Outlets | |
| Outlets | 1 × 120 V 20 A duplex (5-20R) 1 × 120 V 30 A twist-lock (L5-30R) USB, 5 V DC (1 A and 2.1 A) |
| Other | |
| CO shutdown | COsense 1 |
| Emissions certification | 50-state (7723-1) and 49-state (7723-2, 7723-3) versions 1 |
| Warranty | 3 years residential, 2 years commercial 1 |
Oil, spark plug and service
What to have on the bench before an oil change or tune-up.
| Oil capacity | 0.6 qt0.6 L 1Generac prints "0.6 (0.6)" for quarts and liters; 0.6 L is about 0.63 qt. |
| Oil type | 10W-30 or SAE 30 1The owner's manual's temperature chart also lists synthetic 5W-30. |
| Spark plug | F7TC, F7RTC or NGK BPR6ES, gap 0.024–0.028 in (0.6–0.7 mm) 2 |
| Change oil every | After the first month or 20 hours, then every 100 hours or 6 months 2Every month under heavy load or in high temperatures. |
Parts
Search links for common parts. Check the part number against the label on your unit before you buy.
| Part | Find it |
|---|---|
| Air filter | Amazon · eBay |
| Spark plug | Amazon · eBay |
| Engine oil | Amazon · eBay |
We may earn a small commission if you buy through these links. It doesn't change what we list. More.
Model numbers
This page covers model numbers 7723-1, 7723-2, 7723-3. Brands often sell the same name under several numbers with small differences, so check the label on the frame.
Compare
Often compared: Predator 3500 Super Quiet Inverter (item 56720), Honda EU3000iS, Champion 100396 3400-Watt Dual Fuel Inverter
Questions people ask
How much oil does the Generac iQ3500 take?
0.6 qt0.6 L. Oil type: 10W-30 or SAE 30. Oil change: After the first month or 20 hours, then every 100 hours or 6 months.
What spark plug does the Generac iQ3500 use?
F7TC, F7RTC or NGK BPR6ES, gap 0.024–0.028 in (0.6–0.7 mm), according to the source. Check the plug in your unit before you buy a replacement.
How long does the Generac iQ3500 run on a tank?
8.9 h. That's at 50% load, according to the source. More load means less time.
How much does the Generac iQ3500 weigh?
109.1 lb49.5 kg.
What's the difference between 3,000 W and 3,500 W?
3,000 W is what it can supply continuously. 3,500 W is a short burst for the moment a motor (a fridge, a pump, an AC unit) starts up.
Sources
- Generac iQ3500 spec sheet (model 7723, Rev. C 05/2024). Manufacturer, accessed November 12, 2026.
- Generac iQ3500 owner's manual (Rev. A 04/2018). Owner's manual, accessed November 12, 2026.
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