Onan 4500 vs Predator 3500

Having a portable generator is your gateway to peace of mind whenever you have power outages. It also comes in handy when you are out camping or living in your RV. Most portable generators are lightweight hence making them easier to carry around. They also come with electric start mechanism which makes them easier to operate. If you are worried about getting a generator because of the noise it produces do not worry because portable generators tend to be very quiet. In this review, we check out the Onan 4500 vs. Predator 3500 and tell you which is better.

What are the differences between the Onan 4500 and Predator 3500?

Onan 4500
Predator 3500
Running watts
Starting watts
Noise levels
Run time
18 hours
11 hours

Onan 4500 vs Predator 3500 – How do they compare


The Onan 4500i is more powerful than the predator 3500. It comes with running and starting watts of 3700w and 4500w compared to 3000w and 3500w for the predator 3500. With more power you are able to operate more appliances. The generator is what you need to run your household during power outages. The generator also comes with almost double the run time of the predator with its 18 hours against 11 hours. More hours means you can do more with your generator.

Fuel efficiency and noise levels

The Onan 4500i has better fuel efficiency than the predator 3500 delivering 0.19GPH against 0.24GPH for the predator. What this means you get to save on gasoline. Both generators produce low THD with the Onan 4500i offering <3% and the predator 3500 <5%. With this you are able to operate your sensitive electronics with ease. The Onan 4500i is also quieter than the predator with a noise output of 52dBA against 57dBA.

Portability and operation

The Onan 4500i is slightly lighter than the predator 3500. It weighs 98lbs. against 99.2lbs. for the predator. Both generators are offer great maneuverability courtesy of their wheels. You have a double handle in the predator and a telescopic handle in the Onan. You can power both generators with an electric starter or the traditional pull and start mechanism. Both generators come with digital data centers and have three AC outlets.

Onan 4500 vs Predator 3500 – A Comparison Overview

Onan 4500 – Overview

Onan 4500 vs Predator 3500

The Onan 4500i is a powerful 224cc gasoline generator with an output of 3700w (running watts) and 4500w (starting watts). Due to its high power output the Onan 4500i is an ideal generator for your RV, camping trips and use as a backup generator for your house. The generator is highly portable hence making it good for use in outdoor recreational trips.

The Onan 4500i is a quiet generator with a noise output of 52dBA and this makes it ideal for running most of your household appliances. The inverter generator is operated via an electric starter with the option of a traditional pull and start mechanism. For added convenience the Onan 4500i goes further to offer its users a remote starter key fob.

The generator has a fuel capacity of 3.4 gallons and this should give you a massive 18 hours at full tank and at 25% load capacity. This is way more than what other comparable portable generators offer. The generator comes with three AC outlets and with a TT-30R receptacle this generator is RV ready without the need for adaptor.

The Onan 4500i is lightweight at 98lbs. and with transport wheels it is easy to move around. It also comes with a telescopic handle for added transportation. The control panel comes with both a digital data center that displays for you key generator information like voltage, power output and lifetime run hours. You also get indicator lights that give you information on when the generator is ready, overloaded or when the oil levels are low. You also get some generator security features like circuit breaker and automatic oil shut off. During purchase you get funnel, tool kit, battery charger and key fob.

What we liked:

  • Electric starter key fob
  • Low noise levels
  • High power output
  • Low fuel consumption
  • High run time

What we did not like:

Few AC outlets

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Predator 3500 – Overview

The predator 3500 is one of the most popular portable generators in the market courtesy of its portability, low noise output, and high power output. The predator 3500 is an ideal generator for use in your RV, camping and for your house during power outages.

A 212cc 4-stroke OHV engine powers the predator. This helps it provide 120v on gasoline. The generator has a run time of 11 hours on full tank. Its tank can hold up to 2.6 gallons of gasoline with a fuel efficiency of 0.24GHP. The generator fuel efficiency means you are going to be saving on gasoline. The predator 3500 is parallel capable meaning you can connect it to other similar generators for more power output.

The predator uses an electric starter for starting it but you also get the traditional pull and start mechanism. The generator produces a noise output of 57dBA which is relatively quiet enough to enable you power up your appliances.

Power is delivered to your appliances via three AC outlets. You have two 120V 20A outlets and one 120V 30A outlet. You also get one DC outlet. The generator is not RV ready but it does come with a RV adaptor.

Operation and monitoring of the generator is via its digital center indicator lights. The digital center is capable displaying key generator information on power output, lifetime run hours, and voltage. You also have indicator lights to show when the generator is ready, overloaded and when the oil levels are low. The predator 3500 comes with a built-in fuel gauge that allows you to know when you are running low on fuel.

The predator 3500 is a highly portable generator with its four transport wheels, lightweight design and double handles. You can move it around as you want.

What we liked:

  • Highly portable generator
  • Digital data center
  • Automatic oil shut off
  • Emissions compliant

What we did not like:

A bit noisy

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Verdict: So, which is better – Onan 4500 or Predator 3500

For this round we will have to give it up for the Onan 4500i. The generator has an edge over the predator 3500 due to its higher running and starting wattage. The generator is also slightly lighter and quieter than the predator. However, it is the long 18 hours of run time that cause it to stand out. Both generators are similar in other aspects like both coming with electric starters, having transport wheels, three AC outlets and having a digital data center.


How do you start the predator 3500?

You do this via the electric starter or the traditional pull and start mechanism. The Onan 4500i goes further with its iconic key fob start

Which is better for a household – Onan 4500i or Predator 3500?

The Onan 4500i benefits a great deal from its high power output when compared to the Predator 3500. This means you are able to power up more appliances and for longer with the Onan 4500i than the predator 3500.