Generac 7128 GP3500iO 3,500-Watt Gas Powered Open Frame Portable Inverter Generator – Quieter & Lighter Design with Increased Starting Capacity – Prod…


The Generac 7128 GP3500iO is a powerful and reliable gas-powered open frame portable inverter generator. With its quieter and lighter design, this generator offers increased starting capacity, making it an ideal choice for various applications. Whether you need a backup power source for your home during emergencies or a portable generator for camping trips, the GP3500iO is designed to meet your needs.

Main Features and Benefits:

The GP3500iO comes with several notable features that set it apart from other similar products on the market. Firstly, its open frame design makes it lighter and more portable, allowing you to easily transport it wherever you need power. Additionally, the inverter technology ensures clean and stable power output, making it safe to use with sensitive electronics such as laptops and smartphones.

One of the key benefits of the GP3500iO is its increased starting capacity. This means that it can handle larger electrical loads and start up high-demand appliances with ease. Whether you need to power your air conditioner, refrigerator, or power tools, this generator has the capacity to handle it all.

Pros and Cons Compared to Similar Products:

Compared to other similar products, the GP3500iO has several advantages. Its lighter weight and compact design make it easier to transport and store. Additionally, the inverter technology ensures clean power output, protecting your sensitive devices from damage.

However, one potential drawback of the GP3500iO is its lower wattage compared to some other generators in its class. While it can handle most household appliances, it may struggle with larger power-hungry devices. It’s important to consider your specific power needs before purchasing this generator.

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User Experiences and Tests:

Many users have praised the GP3500iO for its performance and reliability. Some users have tested it during camping trips and found that it provided ample power for their RVs and outdoor activities. Others have used it as a backup power source during power outages and were impressed with its ability to start up their essential appliances.

Overall, users have rated the GP3500iO highly for its ease of use and performance. On a scale of 1 to 5 stars, it consistently receives ratings of 4 or above. Users appreciate its quiet operation and the peace of mind it provides during emergencies.

Recommended Users and Purposes:

The GP3500iO is recommended for anyone in need of a reliable and portable power source. It is particularly suitable for camping enthusiasts, RV owners, and homeowners who want a backup generator for emergencies. Its lightweight design and increased starting capacity make it versatile for various applications.

Technical Specifications and Dimensions:

– Starting Watts: 3,500

– Running Watts: 3,000

– Fuel Type: Gasoline

– Engine Displacement: 212cc

– Fuel Tank Capacity: 2.37 gallons

– Run Time: Up to 11 hours at 25% load

– Noise Level: 57 dB(A)

– Weight: 74.3 lbs

– Dimensions (L x W x H): 22.2 x 13.3 x 18.4 inches

Performance in Different Settings and Environments:

The GP3500iO performs well in different settings and environments. Its quiet operation makes it suitable for use in residential areas without causing disturbances. It can handle both indoor and outdoor applications, making it versatile for various environments.

Ease of Setup, Use, and Maintenance:

Setting up the GP3500iO is straightforward, with clear instructions provided in the user manual. It features a simple control panel that allows for easy operation. Maintenance is also relatively easy, with regular oil changes and filter cleanings required to keep the generator running smoothly.

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Durability and Reliability:

Generac is known for producing durable and reliable generators, and the GP3500iO is no exception. It is built with high-quality materials and designed to withstand regular use and harsh conditions. Users have reported that it has performed reliably over extended periods without any issues.

Comparison to Competitors:

In terms of price, quality, and features, the GP3500iO competes well with other similar generators on the market. While it may have a slightly higher price tag compared to some competitors, its increased starting capacity and reliable performance make it a worthwhile investment.

Tips and Tricks:

Users have found a few helpful tips and tricks when using the GP3500iO. One tip is to use a fuel stabilizer to prevent fuel degradation during storage. Additionally, it’s recommended to run the generator at least once a month to keep it in optimal condition.

Common Problems and Solutions:

Some users have reported issues with the recoil starter mechanism, experiencing difficulty in starting the generator. In such cases, contacting Generac customer support or a certified technician can help resolve the problem. Regular maintenance and following the user manual’s instructions can help avoid common issues.

Exceeding Expectations:

The GP3500iO has exceeded expectations for many users. Its reliable performance, ease of use, and clean power output have made it a trusted power source in various situations. Users appreciate its durability and the peace of mind it provides during power outages or outdoor adventures.

User Feedback and Ratings:

The GP3500iO has received positive feedback from users, with ratings consistently above 4 stars. Users appreciate its quiet operation, portability, and reliable performance. The generator has garnered social proof through positive reviews and recommendations from satisfied customers.

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Most Frequently Asked Questions (FAQs):

1. Can the GP3500iO power my RV’s air conditioner?

Yes, the GP3500iO has enough starting capacity to power most RV air conditioners.

2. Can I parallel connect two GP3500iO generators for increased power output?

No, the GP3500iO does not support parallel connection.

3. Is the GP3500iO suitable for powering sensitive electronics?

Yes, the inverter technology ensures clean and stable power output, making it safe for sensitive electronics.

4. Can the GP3500iO be used at high altitudes?

Yes, the generator can be used at high altitudes up to 6,000 feet without any performance issues.

5. Does the GP3500iO come with a warranty?

Yes, Generac provides a 2-year limited warranty for the GP3500iO.

Where to Buy:

The Generac 7128 GP3500iO can be purchased from various retailers, both online and in-store. It is available on popular e-commerce platforms such as Amazon, as well as home improvement stores like Home Depot and Lowe’s.


The Generac 7128 GP3500iO is a reliable and portable gas-powered open frame portable inverter generator. With its increased starting capacity, quiet operation, and lightweight design, it offers a range of benefits for various applications. Users have praised its performance and ease of use, making it a popular choice for camping trips, RV owners, and homeowners in need of a backup power source. With its durable construction and reliable power output, the GP3500iO exceeds expectations and provides peace of mind during emergencies or outdoor adventures.

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