How Long Does a Generator Last?

Want to know more about generators before you go shopping? Generators can be a matter of life or death, so knowing how long they’ll last is essential.

A typical portable generator can last 1500-3000 hours. However, some factors affect how much use you can expect from them. Home standby generators that cost tens of thousands will run for 10 to 20 years.

In this guide, you’ll learn more about things like:

  • How to calculate a generator’s runtime
  • How different generators last
  • How often you’ll need to replace generators

Using a wrong generator can damage or destroy it, so knowing what to expect before shopping is essential. Keep reading so you’re not caught off guard.

Old Cast Iron Diesel Generator
How Long Does A Generator Last? 7

How Long Does a Generac Generator Last?

Generac generators are typically long-lasting, and a good portable model can last up to 3000 hours of use. The example shown in the image above is over 50 years old, although they don’t make them like they used to.

Another reason for their shorter life, like many things, is efficiency. Due to a tighter and more effective output, modern generators are put under great demand.

Generator Run Time Calculator

The easiest way to calculate a generator’s run time is by using this equation: [Average Gallons Per Hour] x [Gallons Per Tank]. For example, if your generator uses one gallon per hour and has a six-gallon tank, you can expect six hours of performance.

How Long Will a Whole House Generator Run on Natural Gas?

Whole-house generators are significantly more durable than regular portable generators so you can get more active use. In theory, a whole-house natural gas generator can run almost indefinitely.

However, many manufacturers recommend limiting the runtime to about 500 continuous hours before stopping it from doing maintenance. This is slightly less than three weeks of running.

See also  How Long Can You Run A Generator

The 500-hour limit isn’t universal, however. Some manufacturers make generators for long-term use, which can last several years. With maintenance, they may last even longer.

Continual generators are too expensive for most household needs, especially if you don’t have enough natural gas to use through power outages. However, they’re a good option for people who want to live as far off the grid as possible while still having a lot of electricity.

How Long Do Portable Generators Last?

Portable generators last between 1000 and 3000 hours, depending on the model, how heavily you use them, how well you maintain them, and whether you store them properly.

What Is the Life Expectancy of a Portable Generator?

The life expectancy of a portable generator is how many hours of runtime you can expect from it under ideal conditions. Ideal conditions include performing maintenance exactly as the manufacturer recommends.

Models have different life expectancies, but most portable generators will last between 1000 and 3000 hours (about 41-123 days of running). Anything below this range is too low to be a decent generator, while anything higher indicates a particularly high-quality product.

Exhaust Pipe Of A Portable Gasoline Generator
How Long Does A Generator Last? 8

How Often Do You Need To Replace a Generator?

How often you need to replace a generator depends on how much you use it and how well you maintain it. Most generators are durable and don’t degrade very fast as long as you keep them in a dry area without many temperature changes.

Generators may need maintenance after a long storage period, but you can realistically expect them to last for 10 or 20 years under optimal conditions. If you use your generator heavily, you may need to replace it as often as every year.

Take a look at the different types of generators below. The cost reflects the power and the number of years you’ll be able to run them.

Generac Guardian 24Kw Home Standby Generator With Pwrview Transfer Switch Wi-Fi...
45 Reviews
Generac Guardian 24kW Home Standby Generator with PWRview Transfer Switch Wi-Fi…
  • Save up to 8,000 dollars in product and installation costs (when compared to competitive output products)
  • Takes up 70% less space (when compared to competitive output products)
  • PWRview, Generac’s home energy management system, allows generator owners to monitor and manage home energy usage, leading to a reduction in…
SaleBestseller No. 1
Jackery Portable Power Station Explorer 300, 293Wh Backup Lithium Battery, 110V/300W...
5,616 Reviews
Jackery Portable Power Station Explorer 300, 293Wh Backup Lithium Battery, 110V/300W…
  • SPEED UP YOUR RECHARGEABILITY: It takes only 2 hours to recharge 80% battery of the power station through the wall outlet and 60W PD USB-C port…
  • SAFE & STEADY POWER SUPPLY: Armed with a 293Wh lithium-ion battery pack, the Explorer 300 features 2 Pure Sine Wave AC outlets that deliver…
  • POWER YOUR EXPECTATIONS: Featuring 2* AC outlet, 1* PD 60W USB-C port (input/output supported) , 1* fast charge 3.0 port, 1*USB-A port and 1* DC…
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Westinghouse 12500 Watt Dual Fuel Home Backup Portable Generator, Remote Electric...
11,434 Reviews
Westinghouse 12500 Watt Dual Fuel Home Backup Portable Generator, Remote Electric…
  • 9500 Running Watts and 12500 Peak Watts (Gasoline); 8500 Running Watts, 11200 Peak Watts (Propane); Remote Start With Included Key Fob, Electric…
  • Features Two GFCI 120V 5–20R Standard Household Receptacle, One Transfer Switch Ready 120V L14-30R, and One RV Ready 120/240V 14–50R; All…
  • Powered by a Heavy Duty 457cc Westinghouse 4-Stroke OHV Engine Featuring a Long-Lasting Cast Iron Sleeve With Automatic Low Oil Shutdown and…
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Durostar Ds4000S Portable Generator, Yellow/Black
2,773 Reviews
DuroStar DS4000S Portable Generator, Yellow/Black
  • Plenty of Power – With 4,000 peak watts and 3,300 running watts, this unit can handle heavy loads, from lights and a refrigerator to a home air…
  • Powerful Engine – The DuroStar 208cc OHV engine is a workhorse that provides plenty of power to handle multiple jobs, from powering high…
  • Low Oil Shutoff – Protects your investment by automatically shutting the generator off when it senses that the oil is low

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