Generac GP2500i Review: Is It Strong Enough?

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Generators don’t need to power a house to be useful. Find out in this review whether the Generac GP2500i would be the right choice for you.

Generac GP2500i review in short

Generac GP2500i

The Generac GP2500i is a convenient way to power a few small to medium-sized devices.

Something that stands out is the number of customers that mention how silent this generator is.

One thing that could be slightly better in the Generac GP2500i is its run time.

Because of this and other smaller reasons, you may prefer one of the generators that are higher on our list of the best 2500 watt generators.


  • Customers find the Generac GP2500i relatively silent
  • Low THD of less than 5%
  • Relatively budget-friendly price
  • Has a duplex of 120V 20A 5-20R outlets, a 8A 12V DC outlet, and one USB port


  • A longer run time would be welcome
  • No convenient way to see the remaining run time

Generac GP2500i key features

Different generator models can vary in many areas.

Luckily, you typically don’t have to know about every single one of these to make an informed decision.

More specifically, you can find the Generac GP2500i features that are most likely to play a role in your choice in this first table.

FeatureGenerac GP2500i Detail
Fuel TypeGasoline
Starting Watts2500 Starting Watts
Running Watts2200 Running Watts
Run Time @25% Load8 Hours
Noise LevelsCustomer Mentions Range
From 53dB to 72dB
Outlets(1) Duplex Of 120V 20A 5-20R Outlets,
(1) 8A 12V DC, (1) USB Port
Low THDLess Than 5%
Warranty*3 Years Limited Residential
And 1 Year Limited Commercial
Price Category**$$
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Generac GP2500i key features

*Warranties can vary from seller to seller

**Price category at the time of writing

What will the Generac GP2500i run?

Since converting fuel into electricity is the main purpose of generators, you definitely want to find out what the Generac GP2500i can run.

Before going into examples of appliances and tools, the Generac GP2500i comes with 2500 starting watts, 2200 running watts, 120 volts, and 20 amps.

You can describe what a 2500 watt generator will run as multiple small to medium-sized appliances at the same time.

If you are fine with running only one tool or appliance, the Generac GP2500i can potentially even run a small AC system, certain circular saws, or an electric grill.

These rough guidelines are helpful but ideally, you would check an appliance wattage chart or even better the manuals of the devices you want to run.

This enables you to figure out exactly how many watts, amps, and volts you need and whether the Generac GP2500i is strong enough to power these.

What are the Generac GP2500i fuel capacity and consumption?

Refueling your generator will inevitably be part of the experience but there are still differences between brand models in terms of how often this needs to happen.

Unless you are one of the unusual people who likes this process, longer run times tend to be preferred.

The Generac GP2500i has a run time of 8 hours at 25% load and a run time of 4.5 hours at 50% load.

In combination with the 1-gallon fuel tank, you can estimate that the Generac GP2500i offers about 4.400 kWh per gallon of fuel.

You can describe these numbers as average to slightly below average.

Many people will find the Generac GP2500i good enough in these areas but if you really value a long run time, you likely want to consider other alternatives.

Generac GP2500i customer reviews insights

A good review of the features of the Generac GP2500i is helpful but you want to keep in mind that generator brands do not always deliver on their promises.

Because of this, it tends to be smart to go over the customer reviews of generators too.

To make things easier for you, I checked these so you don’t necessarily have to.

There are a few cases where the Generac GP2500i arrived with issues.

On the flip side, reviews do typically mention these issues get resolved with customer support.

Additionally, it is worth noting that besides these exceptional issues, customers tend to be positive about the Generac GP2500i.

There are a good amount of mentions about the Generac GP2500i being relatively quiet. This can be welcome when camping, tailgating, and in other crowded situations.

Generac GP2500i alternatives

The Generac GP2500i is obviously not the only generator on the market either.

For now, I have not yet investigated every single Generac GP2500i alternative on the market.

In the meantime, you can check out some of the generator comparisons and top picks lists the Generac GP2500i appears in below:

Is the Generac GP2500i worth it?

The Generac GP2500i is a solid low-medium power generator that comes at a relatively budget-friendly price.

Customers tend to be positive about how low the noise levels of this generator are.

This can be helpful for people who want to keep things quiet while camping, tailgating, and similar situations.

If it provides you with enough watts, amps, and volts and you don’t mind carrying around the 48 lbs (21.8 kg) due to the lack of wheels, the Generac GP2500i can be worth it.

Generac GP2500i

Other Generac GP2500i specifications aka specs

It is possible that you are still interested in a few Generac GP2500i specifications I did not mention yet.

These can range from the capacity of different parts to whether or not the Generac GP2500i supports the use of a parallel kit.

Additionally, the Generac GP2500i manual can be helpful to get an idea of what you can expect from this generator or to troubleshoot specific issues like what to do if the machine won’t start.

SpecificationGenerac GP2500i Detail
Voltage120 Volts
Run Time @50% Load5
Fuel Tank Capacity1 Gallon
Fuel Efficiency
(kWh Per Gallon @25% Load)
Engine Displacement98cc
Outlet CoversYes
Recoil Pull StartYes
Electric StartNo
Low Oil ShutdownYes
Fully Enclosed DesignYes
AC Frequency60 Hz
Remote StartNo
Built-In Digital Smart LCDNo
Hour MeterNo
Fuel GaugeNo
Wattage MeterNo
Run Time RemainingNo
Engine Type4 Stroke
Remote Generator OperationNo
Parallel ReadyYes
Dimensions19.7″ L x 11.4″ W x 17.9″ H
Weight48 lbs (21.8 kg)
Country Of OriginNot Mentioned
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Other Generac GP2500i specifications aka specs

Generac GP2500i FAQ

How long will a Generac GP2500i run?

A Generac GP2500i will run around 8 hours at 25% load and around 4.5 hours at 50% load.

How much oil does a Generac GP2500i take?

The Generac GP2500i has an oil capacity of 0.36 Qt which is about 11.52 fl oz or 0.35 liters.

How many decibels is a Generac GP2500i?

The Generac brand does not give any decibels but customer reviews mention a Generac GP2500 is around 53 to 72 decibels depending on the distance and load.

How much does a Generac GP2500i weigh?

A Generac GP2500i weighs around 48 pounds or around 21.8 kg.

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Mats is the founder and head editor of Generator Decision. With a combination of critical thinking, tireless research, and a healthy interest in electronics he helps people find the right generators and how to use these. At this point in the journey, Mats has done research on hundreds of portable generators.