Generac GP3500iO generator

Are you suffering from unexpected power cuts? You can solve this problem by purchasing a portable generator. You can use this generator for powering household appliances like lights, fans, electric toasters etc. Plus, these generators might help you to proceed with the construction works. Yes, you can use the output wattage to run small power tools like steel cutters, drilling machines etc.

If you are looking for a portable generator to install at your job site or house, the Generac GP3500iO Portable generator is a good pick for you. In addition, you can also use this generator while camping to keep essential communicating devices like smartphones active during emergencies. In this article, we will discuss some interesting features of the Generac GP3500iO generator. 

What do we prefer Generac GP3500iO generator?

The output wattage is enough to run essential devices during a blackout day. You will still have more power left to run heavy ampere appliances like refrigerators. A powerful 212cc OHV engine delivers a starting watt of 3500W and a running watt of 3000W. Since this generator is parallel compatible, you can connect the unit to another similar model to gain extra power. 

This generator comes with a Power Dial option. Plus, you can start the generator using a recoil system. With a full tank, you can expect a runtime of about 11 hours. 

Obviously, one of the main factors you focus on is performance. When the performance is high, the noise level is also high. Generac GP3500iO generator is 40% quieter than the Honda EU3000IS. So, you can confidently use this generator for outdoor activities like parties, camping etc. 

The inverter technology of this generator ensures a clean sinewave without any voltage spikes. So, you can run the sensitive devices without causing any damages. With standard dimensions, this generator is lightweight and is suitable for tailgating. 

Generac GP3500iO generator- An Overview 

Generac GP3500iO generator is a portable generator that is very comfortable to transport from one place to another. The circuit breaker will disconnect the power supply between the unit and the appliances during overloading conditions. So, you can protect the devices from damage. Plus, the circuit breaker will act as a stabilizer and helps in saving money.

The control panel will provide basic information like fuel consumption, runtime, fuel levels, runtime and power ratings. So, you can monitor the generator’s internal workings and schedule proper maintenance. 

An air-cooled 212cc OHV engine will deliver high power to run the whole house appliances. If you want additional power, you can connect two generators in parallel. The engine operates at only half the noise level of standard generators. So, you can enjoy a good sleep without any disturbance. Inverter technology ensures a clean power generator to run sensitive devices like mobile phones, laptops and tablets. 

Highlights of Generac GP3500iO generator

  1. This generator is equipped with PowerRUSH technology to boost the starting power by 50%
  2. The engine operates at a reduced noise level and is suitable for outdoor activities 
  3. It is 25% lighter compared to traditional generators and is east to port anywhere 
  4. An average output of 3500W is enough to run essential devices in a blackout day
  5. It features a simple dial option and is easy to start using a manual recoil system
  6. This generator comes with parallel compatible options. So, you can connect two similar generators in parallel to increase the overall output power
  7. There are power outlets like one 120V 20A 5-20R Duplex, one 120V 30A L5-30R Twist lock and two USBs for battery charging 
  8. The true power technology employed in this generator will generate clean power without any voltage spikes. So, you can utilize this power to run delicate electronics 
  9. It comes with a warranty of two years
  10. A 2.37-gallon of fuel tank offers a runtime of about 8.9 hours at 50% applied load
  11. The unit comes with attached wheels and handlebars
  12. A spark arrestor will prevent any sparks from escaping outside during the engine’s internal combustion

Specifications of Generac GP3500iO generator

Manufacturer Generac
Running and Peak watts 3000W and 3500W
Item dimensions in inches 19.7 x 16.5 x 16.4
Engine displacement 212cc
Runtime at 50% load(gasoline) 8.9hours  
Tank capacity 2.37gallon
Item weight in pounds 74.3
Warranty in years 2

 A detailed review on Generac GP3500iO generator

Power output and runtime 

A 212cc OHV air-cooled engine will deliver a peak watt of 3500W and a running watt of 3000W. You can utilize this power output to run essential devices like lights, fans, electric toasters and refrigerators. Since this generator is parallelly compatible, you can connect two similar generators using a parallel kit to double the output. 

Very importantly, this generator comes with smart dial options. You can easily start the generator using a manual recoil system. 

A 2.37-gallon fuel tank offers a runtime of 8.9hours at an applied half load condition. The true power technology equipped with this generator will produce clean power with the least harmonic distortion of less than 3%. So, the power is stable and is safe to run sensitive devices. 


With a standard dimension, this open frame generator is compact and lightweight. So, it is suitable for both indoor and outdoor activities. You can transport this 74.3pound generator with ease using attached wheels and handlebars. 

Warranty, Certificate and support 

Generac GP3500iO is certified with CARB Compliance. So, it has a proper license to ship to over 50 states, including California. In addition, this generator comes with a spark arrestor. It prevents the fire sparks from escaping outside during the engine’s internal combustion. 

This generator comes with a warranty of three years. Plus, excellent customer service is available 24/7 to pick your calls. 

Control panel and power outlets 

The control panel is the accessing point of the generator. It consists of a smart dial option to ON/OFF the engine, parallel ports, circuit breaker, smart eco-mode. There are LED indicators to alert the operator about the low oil and output ready. In addition, the power panel comes with an hour meter. It fetches information about the voltage, frequency and hours of operation. So, you can monitor the generator’s internal workings to schedule proper maintenance. 

The circuit breaker will disconnect the power supply between the generator and the appliances during overloading conditions. The power outlets like one 120V 20A 5-20R Duplex, one 120V 30A L5-30R Twist lock and two USBs are enough to run multiple devices at a time.

Noise level

Although Generac GP3500iO generator is an open frame generator, it operates at a low decibel rating. So, you can have a normal conversation with your neighbours. 


This unit comes with accessories like a user manual, tool kit, engine oil and oil funnel. 


Bestseller (lists)

Generac GP3500iO Open Frame RV Ready Inverter Generator - 3500 Starting Watts with PowerRush Technology Patio, Lawn & Garden

  • PowerRUSH Technology - Delivers over 50% more starting capacity-allowing you to do more with less
  • Up to 50% quieter - ideal for noise sensitive environments/ up to 25% lighter - for improved portability
  • True power technology - clean power for sensitive electronics
  • RV ready - connect directly to RV to power most RV air conditioners up to 15, 000 BTU
  • USB outlets and parallel ready - connect 2 units together for double the power... Read More

Comparison with similar-sized generators 

Generac GP3500iO Vs Honda EU2200i

Generac and Honda always focus on customer convenience. A generator must be portable to take power everywhere. Both GP3500iO and EU2200i are lightweight and portable generators.

When it comes to output wattage, GP3500iO offers a peak wattage of about 3500W. On the other hand, Honda EU2200i delivers only 2200W. In a similar way, the running watt of GP3500iO is also higher than EU2200i. 

In GP3500iO, you will obtain a runtime of about 10.75 hours at an applied quarter load. But the runtime is only about 6 hours in EU2200i. Both models are powered by an OHV 4-stroke engine. In addition, they are CARB-compliant, and EPA approved. 

These models come with parallel compatible options. So, you can connect similar models using a parallel kit to gain extra power. So, you will never run out of power. There is no compromise in the safety features since both control panels consist of basic automatic features like a low oil shutoff system. It stops the engine operation when the oil level is low. In addition, the smart eco mode will control the engine speed based on the connected loads. So, you can utilize the fuel efficiently. 

Since these generators are inverters, they operate in a now decibel ratings. You can expect a warranty of two years from both models.

Features Generac GP3500iO Honda EU2200i
Peak watts 2600W 2000W
Parallel capability yes yes
Runtime in hours at 25% load 10.75 6
Tank size in gallons 1.2 1.18
Noise level in dBA 50 50
Fuel gasoline Gasoline
Certificate CARB compliant and EPA CARB compliant and EPA

Final Words

We hope that you have got better clarity on the Generac GP3500iO generator. It comes with many user-friendly features. You can utilize the 3500W for keeping the generators active at times of emergencies. Plus, you can also increase the output using parallel compatible options. A medium-sized tank offers an impressive runtime. Plus, you can increase the runtime by switching to Eco mode. Before choosing the generator, you must look at the factors like fuel capacity, runtime, power output. You can place your orders at ecommerce sites for the best deals and offers.

Other similar-watt generators 

There are furthermore generators that offer similar watts to meet your power demands. You can also have a look at the following generators.

Firman H08051 generator

Westinghouse iGen4500 generator 

Champion 100111 generator 

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