The Generac GP5500 – Reviewed

The Generac GP5500 (5939) is one of the best generators that Generac have on offer. It’s known for its great reliability, extreme durability, and high build quality.

The Generac 5939 is an extremely versatile generator in that it can provide power which is plentiful and suitable for use in a variety of situations. For example, it’s great for use alongside and RV when camping, as well as being ideal for providing power to machinery on a building site.

In this post, we’re going to take a look at the Generac 5939 GP5500 in detail. We’ll look at what features of the generator are great, as well as those points that could be improved. We’ll give an unbiased opinion of the unit, and recommend users that it’s best for in practice.

An Overview

Generac is a name that has been around for a long time. It has been in the business of power generation for over 60 years. It has been a brand that’s been widely used by many people all over the USA for many years.

Generac has become one of the largest suppliers of generators and machinery in the world, and for good reason. They supply all areas of the market with high-quality generators and products.


The Generac GP5500 is able to output 6875 watts of starting power and provide a continuous wattage of 5500 watts. This is more than enough to easily power a variety of appliances at the same time. If you’re using the GP5500 alongside your RV, it will have more than enough power to keep all of the appliances inside your RV going.

The GP5500 is all suitable for use at home. It can be used around the garden to power machinery. With 5500 watts of continuous power, it’s more than capable of powering anything that you would use in the garden.

Whilst the 5939 is great for residential use, it’s also very capable of being used on a construction site for example due to its durability. It’s encased in a hardwearing frame and comes supplied with a wheel kit – it’s very easy to move over rougher terrain and around a building site.

Key Features

Starting wattage of 6875 watts and a continuous wattage of 5500 watts. It’s got more than enough power to keep those essential appliances going in your home in the event of a power cut. It’s also enough to power larger items of garden equipment and machinery with ease.

Durable – the OHV engine that’s fitted within the 5939 uses splash lubrication. This makes sure the engine is always well lubricated and that it doesn’t burn out – avoiding serious engine damage and repair bills. The power outlets on the GP5500n are also protected with plastic flaps to ensure that dust and debris do not enter and damage the sockets.

Efficient – the Generac GP5500 will keep running for more than 10 hours when being used at half of its potential. It runs on gasoline and can hold a respectable 6.7 gallons of gasoline at a time

Fuel Gauge – you won’t run out of fuel unexpectedly when using the GP5500 – the fuel gauge shows clearly when fuel levels are low, and when you should top up.

Hardwearing – the GP5500 is designed with all types of users in mind. It’s encased in a heavy-duty steel frame to ensure that it’s just as suitable for use on a construction site as it is in a back garden of a home

Quiet and Refined – the engine in the GP5500 is well supported by a number of mounting points, that ensure the generator is well-secured and positioned whenever it’s being used. These mounting points also make sure that vibrations and unwanted movements are kept to a minimum

Portable – even though the unit weighs 180 pounds, it’s still suitable for taking around anywhere that you need it. It comes as standard with a wheel kit that’s designed not to go flat regardless of the surface

Automatic Low Oil Detection & Shutdown – when the engine oil becomes too low, the generator detects this and automatically shuts down. This means engine damage is avoided and the long life of the generator is maintained

Hour Gauge – this helps make sure that you don’t run out of power unexpectedly. This gauge provides an estimation of how much time is remaining in the generator based on the current power usage

A good variety of power outlets – the GP5500 has 5 power outlets in total. There’s four 120V household power outlets, as well as a 120/240V twist-lock that’s ideal for RV use

Voltage Regulators & Circuit Breakers – these safety measures make sure that you don’t overload the generator.

2 Year Warranty on all parts


No electric starter – considering that this is a relatively high-end powerful generator, an electric start is a feature that we expected it to have

Reviews on durability are mixed – the unit does, however, come with a 2-year warranty on all parts from Generac

Not CARB compliant – the fact that this is the case means it can’t be used in all states in the USA

Conclusion – is The GP5500 Worth It?

The Generac GP5500 5939 is a classic example of a solidly reliable gasoline powered generator. It’s versatile, in that it’s suitable for use in a wide variety of circumstances. It’s great for use on a construction site due to its durable and hardwearing design. It’s also suitable for residential use – it looks great and is powerful and easy to use.

It very powerful, being able to provide 5500 continuous watts of power. The GP generator series as a whole from Generac is well-reviewed and well-rated by the majority of users who have had experience with them.

Assuming that you maintain the GP5500 properly, it’s a generator that will serve you well and for a long time with 5500 watts of continuous, high-quality power. There have been mixed reviews on the customer service that Generac has provided on occasion, but this does seem to have been getting better more recently.

All in all, the GP5500 is a great unit.

Last update on 2020-09-15 / Affiliate links / Images from Amazon Product Advertising API