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Generac GP3500iO Spec Review

Picture 1 of the Generac GP3500iO
Picture 2 of the Generac GP3500iO

The Generac GP3500iO (7128) is a compact and lightweight open frame portable inverter generator with a rated wattage of 3000 W and a starting wattage of 3500 W.

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Description

Portable generators are a welcome addition to many activities at home, at work, and away. In an emergency, portable generators can provide critical backup power. They make camping and tailgating more comfortable. And contractors appreciate the flexibility portable power brings to the jobsite. (source: Generac)

Zoom on the Generac GP3500iO

In a nutshell, the Generac GP3500iO is a compact and lightweight portable inverter generator mostly geared towards:

  • RV travellers looking for even more independence
  • Handcrafting enthusiasts who wish to work on-the-go
  • Homeowners who want to be able to use the most necessary devices in their household, even during a blackout
  • Camping and tailgating buffs looking to enhance their experience

In the sections ahead, the power characteristics, availability of various outlets, the portability and any additional features of the device shall be discussed, including its emission compliance information.

Power & Run Time

The Generac GP3500iO in use

The Generac GP3500iO

The Generac GP3500iO's build contains a gasoline-fueled 212 cc Generac OHV 4-stroke engine. With a 120V output, it gives a running wattage of 3000W and also a peak wattage of 3500W. Moreover, since it is parallel capable (GP3500iO Parallel Kit not included), its power may be doubled if linked to a second compatible unit.

This inverter generator features a simple traditional pull-start mechanism. It features Generac's PowerDial™, an easy-to-use dial with three operation settings.

With a full tank, the GP3500iO can operate for up to 11 hours (fuel consumption around 0.22 GPH), thanks to its fuel capacity of 2.37 gallons.

As the GP3500iO produces a clean sine wave, with a <3% Total Harmonic Disruption (THD), sensitive electronics may be plugged in the AC outlets safely.

Several examples of what the generator may allow you to power simultaneously are:Note: The examples above are based on a maximum load of 75% and estimated wattages. The devices also may not be able to start at the same time. For a more accurate estimation, use our wattage calculator.

Outlets

The control panel features the upcoming 3 AC outlets:

Duplex 120V 20A (5-20R)
120V 30A (TT-30R) receptacle

In addition, it provides 2 DC outlets: there's two 5V USB ports allowing you to conveniently charge electronics such as mobile phones and tablets.

This Generac generator is RV Ready, as it features a TT-30R receptacle (TT stands for 'Travel Trailer').

Portability

With its dimensions of L19.3 x W16.9 x H16.4 in, the conventional, open frame design of the Generac GP3500iO offers stability and allows the generator to be raised above ground level. The design is ideal for rough environments and demanding outdoor use.

The 74.3 lbs of the GP3500iO's dry weight enables you to use it anywhere you will ever need. In addition, it is even easier to grab and move the generator around thanks to its open frame design.

Features

Panel of the Generac GP3500iO

The GP3500iO's control panel

One of the many GP3500iO's features is the data center, included in its control panel, which conveniently provides information on the lifetime run hours and thus, helps you monitor its activity and status.

In addition to this info, when the generator is overloaded, the generator is ready and the oil level is too low, you will be informed by the featured light indicators.

As far as security is concerned, the generator can be used with a peace of mind, as it features an automatic low oil shut-off and an overload protection (circuit breaker).

Besides the classic documentation and a user manual to get you promptly started, the Generac GP3500iO also comes with some accessories: tool kit, funnel and oil are included.

Emissions

The Generac GP3500iO is CARB-compliant. Thus, selling and purchasing this generator is allowed in each of the 50 states, including California.

Moreover, it features a spark arrestor and thus, may be used in forested areas.

The Generac GP3500iO versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Generac GP3500iO compare to generators of similar power (between 2500 and 3500 W).

  • As for its weight, the Generac GP3500iO weighs only 74.3 pounds, making it one of the lighter generators in the 2500-3500 rated wattage category. If weight matters to you, one of the champions in this power range is the Honda EG2800i with only 66.6 pounds.
  • Autonomy-wise, with 11 hours on a full tank at a 25% load, the GP3500iO is on the low end when compared to other generators of a similar power output. If you consider autonomy on a single full tank as one of the deciding factors, one of the generators in the same power range that offers the highest run time is the Honda EU3000iS, with 20 hours .
  • Run times are important, yet thanks to their dependence on the fuel capacity, they should be judged along with the fuel consumption of the device. Compared to its peers, this inverter generator is not exactly fuel efficient, compared to similarly powerful devices, with an estimated fuel consumption of 0.22 GPH at a 25% load. If you wish to further improve in the area of fuel efficiency, the Energizer eZV3200P, which boasts with a gas consumption of only 0.13 GPH, may be the right generator for you.
According to our stats, the following comparison is pretty popular: Generac GP3500iO vs Generac iQ2000.

Price comparison

As you can see from this dynamic chart, when compared to other 2500-3500W generators, the Generac GP3500iO is on the average side of the price range.

Therefore, this generator nicely fits in the expected budget for this kind of product.

The bottom line

STRENGTHS:
  • In the expected price range
  • Several accessories included
  • RV Ready
  • Parallel capable
  • Inverter
  • Lightweight (74.3 lbs)
WEAKNESSES:
  • No electric start
  • Relatively low run time
  • Low fuel efficiency

Do you own the Generac GP3500iO and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Where to buy the Generac GP3500iO?

You can easily buy your Generac generator online. You will benefit from a convenient delivery and avoid carrying the heavy package yourself. Here are a few reliable online sellers:
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Price History
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Price history for the Generac GP3500iO
Latest updates:
  • $699.00 - July 22, 2019
  • $739.00 - May 31, 2019
Since: May 31, 2019
  • Highest Price: $739.00 - May 31, 2019
  • Lowest Price: $699.00 - July 22, 2019

Features and Specifications

General

InverterYes
PortableYes
Parallel capableYes, cable not included
RV readyYes
FuelGasoline
Engine212 cc Generac OHV 4-stroke
Starting systemRecoil

Power

VoltageAC: 120V 60 Hz, DC: 5V
Running watts3000 W
Starting watts3500 W
Running amps25 amps
Peaks amps29.2 amps
Run time @50% load8 h
Run time @25% load11 h

Features

GFCI outletsNo
Covered outletsNo
Automatic Voltage RegulationNo
AC outlets1x Duplex 120V 20A (5-20R)
1x 120V 30A (TT-30R)
DC outlets2x 5V USB port
Data centerLifetime run hours
IndicatorsLow oil, overload and output ready
Fuel tank2.37 gal
Fuel gaugeNo

Misc

Weight74.3 lbs
Dimensions (L x W x H)19.3 x 16.9 x 16.4 in
Noise (lower limit)N/A
THD< 3%
EmissionsCARB
SecurityLow oil and overload protection
Spark arrestorYes
NeutralFloating
Accessories includedOil, funnel and tool kit
Warranty3 years

Unlike many websites, we did our best to research each of the specs above. That being said, we are not immune to making the occasional mistake or omission. Should you notice any missing or incorrect values, don't hesitate to suggest improvements so we can address the issue.

About Generac

Generac Power Systems is an American based generator and power equipment manufacturer, founded in 1959. As its name suggests, the main focus of Generac are power generators, and other related electric equipment, such as switches, paralleling systems and small engines. The company has several manufacturing facilities based in the US, thus, their products are made in the USA. However, the company provides no information about the origin of their components.

Warranty Information

The Generac GP3500iO is covered under a warranty for up to 3 years. This warranty may be limited and may not cover all parts of the generator.
For more information about the warranty of Generac generators, please consult Generac's warranty policies. Alternatively, you can also contact their Customer Support: 1-888-GENERAC (888-436-3722).

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