3500-Watt Portable Inverter Generator

By: Generac

The Generac GP3500iO Open Frame RV Ready Inverter Generator is the perfect choice for outdoor activities. With 3500 starting watts and PowerRush Technology, it is one of the best Outdoor Generators available. It is easy to set up, has a high build quality, great overall performance, and is highly maneuverable. Get the Generac GP3500iO Open Frame RV Ready Inverter Generator and enjoy your outdoor activities with confidence.
91
B2B Rating
45 reviews

Review rating details

Value for money
77
Size
75
Power output
76
Overall performance
77
Maneuverability
76
Easy to set up
90
Durability
81
Customer support
81
Build quality
75

Details of 3500-Watt Portable Inverter Generator

  • Frequency: 50 Hz
  • Recommended Uses For Product: Residential, Camping
  • Total Power Outlets: 4
  • Output Wattage: 3.5 Watts
  • Starting Wattage: 3500 Watts
  • Model Name: GP3500iO
  • Special Feature: Portable, Super Quiet, Low Oil Shutdown, Hour Meter
  • Product Dimensions: 19.7"L x 16.5"W x 16.4"H
  • Power Source: Gas Powered
  • Engine Type: 4 Stroke
  • Item Weight: 74.3 Pounds
  • Tank Volume: 2.37 Gallons
  • Ignition System Type: Recoil Pull Start
  • Item model number: 7128
  • Engine Displacement: 212 Cubic Centimeters
  • Brand: Generac
  • Wattage: 3500 watts
  • Included Components: Generac 7128 GP3500iO Portable Open frame Inverter Generator, Engine Oil, Oil Funnel, Tool Kit, Owner's Manual
  • Item Weight: 74.3 pounds
  • Color: Orange
  • Customer Reviews: 4.5/5 stars of 3,237 ratings
  • Best Sellers Rank: #9,210 in Patio, Lawn & Garden #38 in Outdoor Generators
  • Voltage: 120 Volts
  • Fuel Type: Gasoline
  • Is Discontinued By Manufacturer: No
  • Running Wattage: 3000 Watts
  • ASIN: B079KRLHBT
  • Manufacturer: Generac Power Systems

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Comments

Michael Shuttleworth: I really want to like this because I was so excited to get it .but the the choke knob has come loose ,and of the 6 times I have used it all of about an hour total .4 of those times the engine light has come on ...and it won't give me power ...when it works ...it's good .it has oil and the plug is new .and I use midgrade fuel .it takes 4 to 6 pulls to start and is very light weight .hopefully my issue can be solved .

Canada on Nov 30, 2023

Amazon Customer: I'm dubious how necessary the extensive break-ins people talk about are - I did that, but I haven't seen a metal shaving in my oil yet and I'm using a magnetic drain plug. Works great, have used it on job sites, noise is fair for a sub-$1000 generator. Only complaint is that it could use some sort of fuel level indicator.

It's physically compact and is 'heavier than it looks', and is difficult to carry or lift in any way besides one-handed. It's unlikely everyone in your household or workplace will be able to haul it around, especially if stairs are involved.

Canada on Sep 21, 2023

Dave: This product is the best inverter i have owned. All my camping and hunting buddies are jealous. Its so quiet. Works perfect

Canada on Sep 12, 2023

Brent K.: Purchased to power RV air conditioner. I knew it wouldn't power it on its own but opted for this small gen with a Soft Start. Powers the Coleman Mach 15 (15K BTU) without issue.
Haven't used it much yet, but have tested it successfully while simultaneously running the converter.

Canada on Aug 10, 2023

Hector: Es menos mucho menos ruidoso que los generadores normales. Mantiene la energía que aporta, desde el principio.

Mexico on Jul 18, 2023

J M: I own a Honda EU2000 which cost $1200 and love it but I wanted a 3500 and didnt want to spend $2000+.

So I bought a Generac 3500iO last year, used it on my farm that does not have electric and it worked great. Strong generator. I put it in storage for a year in 2021, then came back to my farm in 2022. Filled it with fuel, and it started easily on the 2nd pull. I put about 10 hours on it this year and still works perfect and starts very easy. Love it just as much as my Honda so far. And its very quiet, super pleased with this product. Its easy to carry with the medal frame. Love it. I like the open frame so that the engine gets plenty of air and runs cool. Perfect balance and design and function.

So I just ordered a 2nd so I can run parallel for more power when needed.

Highly Recommended. 2 generators for twice the power and half the price. This is the only brand I could take a chance on other then Honda. Generac did a great job with this model.

United States on Dec 27, 2022

Mas: I have owned other generac products before and have been disappointed by them, ironically the last generac generator I owned was a gp3300, and that model was a standard pull start model not inverted and not clean power.

This is the total opposite of that.

This thing is totally silent, so quiet we chained it to one of the blocks at our fireworks tent for we were afraid someone might steal it.

Anyway I got this to directly replace the noisy older GP 3300 and I have to say this is one of the best generators I have ever owned. As mentioned this thing is near silent, even under full load it's near silent. It provides roughly 3100 Watts continuously for our purposes.

During the day it ran a mini glass door refrigerator, register, open sign, and two portable AC units. At night this thing ran the lighting that was built into the fireworks tent without a hiccup, it also ran 8 100 Watt led ground floodlights to light up the banners outside the tent, and because it cooled off at night we could just run fans instead of the AC units.

This thing ran nearly continually for 2 weeks as our fireworks tent is 24 hours. The fuel efficiency on this thing is...

United States on Jul 22, 2022

Bangarang143Bangarang143: Okay, so here's the TL;DR

Awesome generator for a camp trailer. Amazing bang-for-your-buck in comparison to popular brands. SUPER quiet. Quieter than I expected. Weighs less than expected. Starts very easily. Ran my AC unit no problem. Very fuel efficient.

Full review:

This thing is absolutely perfect for what I needed. I have a 30' travel trailer with a 15,000BTU AC unit, and my main concern was running that periodically while boondocking.

I looked at the "red" 2200i's because that's what my in-laws run, but I would have needed 2 of those to run it (like they have done.) That puts me in the ~$2,300 price range. Other 'cons' to this approach: 2 engines to maintain, and 102 total lbs. (I try and travel as light as possible, so I'm always thinking about weight). The 'pros' to this approach: it has the right name on it, serviceable pretty much anywhere.

Anyway, back to this one. The first thing I noticed was how light it is. It only weighs slightly more than a red 2200i. It is a little bigger, but not by much. It fired right up on the first pull (make sure it's on 'choke' as it doesn't seem to start on 'run' even when warm).

The next thing I...

United States on Jul 27, 2020

3500-Watt Portable Inverter Generator Jackery Explorer 240: Portable Power Station for Outdoors and On-the-Go Charging Champion 3800-Watt Dual Fuel RV Ready Portable Generator - Ready for Any Adventure!
3500-Watt Portable Inverter Generator Jackery Explorer 240: Portable Power Station for Outdoors and On-the-Go Charging Champion 3800-Watt Dual Fuel RV Ready Portable Generator - Ready for Any Adventure!
B2B Rating
91
97
96
Sale off $153 OFF $80 OFF
Total Reviews 45 reviews 2 reviews 1 reviews
Frequency 50 Hz 60 Hz 60 Hz
Recommended Uses For Product Residential, Camping Camping
Total Power Outlets 4 1
Output Wattage 3.5 Watts 200 Watts 3800 Watts
Starting Wattage 3500 Watts 400 Watts 4750 Watts
Model Name GP3500iO 240Wh Emergency Backup Lithium Battery, 110V/200W Pure Sine wave
Special Feature Portable, Super Quiet, Low Oil Shutdown, Hour Meter Portable Electric
Product Dimensions 19.7"L x 16.5"W x 16.4"H 9.1"L x 5.2"W x 7.9"H 26.3"L x 22.9"W x 24.8"H
Power Source Gas Powered Solar Powered propane-powered
Engine Type 4 Stroke / 4 Stroke
Item Weight 74.3 pounds 3.1 Kilograms 119 pounds
Tank Volume 2.37 Gallons 3.4 Gallons
Ignition System Type Recoil Pull Start electric start
Item model number 7128 Explorer 240 76533
Engine Displacement 212 Cubic Centimeters 224 Cubic Centimeters
Brand Generac Jackery Champion Power Equipment
Wattage 3000 Watts 200 Watts 3800 Watts
Included Components Generac 7128 GP3500iO Portable Open frame Inverter Generator, Engine Oil, Oil Funnel, Tool Kit, Owner's Manual Solar_panel, charging Cord Generator, Wheel Kit, Propane Hose, Engine Oil, Oil Funnel
Item Weight 74.3 pounds 3.1 Kilograms 119 pounds
Color Orange Black Black
Customer Reviews 4.5/5 stars of 3,237 ratings 4.7/5 stars of 18,595 ratings 4.6/5 stars of 3,306 ratings
Best Sellers Rank #9,210 in Patio, Lawn & Garden #38 in Outdoor Generators #2,125 in Patio, Lawn & Garden #5 in Outdoor Generators #167,864 in Patio, Lawn & Garden #664 in Outdoor Generators
Voltage 120 Volts 110 Volts 120 Volts
Fuel Type Gasoline non-gasoline Gasoline, Propane
Is Discontinued By Manufacturer No No No
Running Wattage 3000 Watts 3800 Watts
ASIN B079KRLHBT B07D29QNMJ B00VFDJGCE
Manufacturer Generac Power Systems No Champion Power Equipment
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