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Generac GP3500iO Inverter Generator with Electric Start

Generac GP3500iO Inverter Generator with Electric Start

Best price now

$916.00at Portlandia Electric SupplyObserved at 12:43 PM

34% under what the other stores charge

Compared across 4 stores. Prices are checked against each store and labelled with when.

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Our take on the Generac GP3500iO Inverter Generator with Electric Start

The Generac GP3500iO is a portable inverter generator rated at 3000 running watts and 3500 starting watts on gasoline. It has a 2.37-gallon tank, an economy mode, a low-oil shutdown and a 61 dB noise rating, and it weighs 74.3 lb. Its best new price is $1,004.53 at Commercial Bag & Supply as of November 5, 2026, with 4 stores listing it new.

Best forCampers and tailgaters needing quiet 120V powerHome backup for a fridge, lights and a few small appliancesJob sites with sensitive electronicsOwners who want inverter power without a premium brand price

Pros

Inverter output is clean enough for laptops, TVs and phones
3000 running watts covers a fridge plus a few small loads
Economy mode stretches runtime and lowers noise at light loads
Low-oil shutdown protects the engine
Four 120V outlets plus USB give plenty of plug-in options
Fuel gauge and status lights make fuel and overload easy to track

Cons

No carbon monoxide shutoff, which many newer portables now have
Recoil start only despite the electric-start name
74.3 lb is heavy for one person to lift into a truck
61 dB is quiet for a generator but still audible at a campsite
120V only, so no 240V for well pumps or dryers

Generac GP3500iO Inverter Generator with Electric Start prices at every store

Portlandia Electric SupplyNew
Availability unknown
$916.00Observed at 12:43 PM
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Commercial Bag & SupplyNew
Availability unknown
$1,004.53Observed at 12:43 PM
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AmazonNew
Availability unknown
As an Amazon Associate, Deal.ai earns from qualifying purchases.
$1,385.54Free shippingObserved at 11:42 AM
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ZenSupply.comNew
Availability unknown
$1,659.51Observed at 12:43 PM
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Also available at

eBayCheck price at eBay

Generac GP3500iO Inverter Generator with Electric Start price history

Lowest price we've seen: $916.00 on Nov 5 at Portlandia Electric Supply. Tracked across 4 stores since Nov 5.

What reviewers say

Owner feedback on the GP3500iO centers on its quiet inverter output and simple setup for camping and light backup. Complaints tend to focus on the weight and the pull start.

What people mention

NoisePraisedOwners say it runs quietly enough for campgrounds and residential use at light loads.
WeightCriticisedAt 74.3 lb, owners find it hard to lift into a truck or up stairs alone.
StartingMixedIt starts reliably for most, but the recoil pull is tiring, and the electric-start name misleads buyers.
Power qualityPraisedInverter output runs laptops, TVs and phones without issues.
SafetyCriticisedBuyers note the lack of carbon monoxide shutdown that rivals now include.

Specifications

CO Sensor: No Carbon Monoxide Detection
Low Oil Shutdown: Yes
Overload Protection: Generator status lights alert when unit is overloaded
Fuel Type: Gasoline
Fuel Capacity: 2.37 gal
Fuel Gauge: Yes
Continuous Output: 3000 W

Questions and answers

Is the GP3500iO actually electric start?: No. The listing name says electric start, but the specs show recoil starting only. Plan on pull-starting it.
What can 3000 running watts power?: A fridge, lights, a fan, a TV and phone chargers at once, or a small RV air conditioner with careful load management. It will not run a 240V well pump or a central AC.
How loud is it?: Generac rates it at 61 dB, which is quiet for a generator but still noticeable at a campsite. Economy mode lowers noise further at light loads.
How long does it run on a tank?: About 8 hours at 50% load on its 2.37-gallon tank. Runtime is shorter under heavy load and longer in economy mode.
Does it have carbon monoxide shutdown?: No. The specs list no CO detection, so run it outdoors and away from windows and vents.
Is $1,004.53 a good price?: That is the best new price across 4 stores as of November 5, 2026. Compare it with other 3000-watt inverter models, since CO-shutoff-equipped rivals often sell in a similar range.
Where is the Generac GP3500iO Inverter Generator with Electric Start cheapest?: At Portlandia Electric Supply, for $916.00, 34% under what the other stores charge, as of our latest check.
Where can I buy the Generac GP3500iO Inverter Generator with Electric Start?: 5 stores we checked sell it, including Portlandia Electric Supply, Commercial Bag & Supply, ZenSupply.com, Amazon, eBay.

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Power Output

3500 W (Starting Watts)

Runtime

8 hours (at 50% Load)

Voltage

120 V

Peak Output

3500 W

Starting Method

Recoil

Efficiency

Economy mode for fuel efficiency

Frequency

60 Hz

Weight

74.3 lb

Depth

19.3 in

Height

16.4 in

Width

16.9 in

Connectivity Ports

USB

Number Of Outlets

4

Receptacle Type

5-20R Duplex

Wireless Connectivity

No (Works with iOS), No (Bluetooth), No (Works with Android)

Noise Level

61 decibels

Inverter Technology

Yes