How Long Do Backup Generators Last​?

November 28, 2024 | Nate Cord

The lifespan of a backup generator depends on several different factors, including how often it’s used, how well it’s maintained, fuel type, the quality of the brand, and most importantly, the type of generator (portable or standby).

For example, portable generators, which are designed for temporary or emergency use, typically last for around 1,000 to 2,000 hours of operation, or 5-10 years with moderate use and good care.

In comparison, standby generators, which are permanently installed and built for long-term use during power outages, will often last for 10,000 to 30,000 hours, or 20-30 years if used sparingly and well-maintained.

Let’s look at these factors in more detail…

Factors Affecting the Lifespan of Backup Generators

1. Fuel Type

Fuel type is a big influential factor when it comes to the lifespan of a backup generator, and this is because the type and quality of fuel used are crucial to engine health

Diesel engines generally last longer due to their robust design and ability to handle heavy-duty operations, while petrol models are generally a little less durable. Natural gas and propane generators are cleaner-burning fuels, which will minimise carbon buildup and increase longevity.

2. Frequency of Use

The more you use something, the faster it’s going to wear, and this is especially the case with generators. So in simple terms, how often and how long it is used will significantly impact its lifespan.

Standby generators, which typically run only during power outages experience less wear than portable models that are frequently used. Overuse, especially beyond the rated capacity, can lead to premature wear and failure.

That said, underuse can result in issues such as stale fuel or internal component degradation if the generator is not exercised regularly.

Portable backup generators are designed for occasional use, which may wear out quickly if overused. Standby generators, which are designed for extended periods of operation, can last decades if only run during outages and for routine testing. That said, as with anything, continuous or excessive use beyond their rated capacity can lead to premature wear and tear.

3. Quality of the Brand

High-quality generators made by reputable brands typically last longer due to better materials, engineering, and design. These premium models often feature robust engines, durable alternators, and advanced control systems that withstand prolonged operation better than cheaper or lower-grade alternatives.

This is why we highly recommend investing in a high-quality brand that can save costs over the long term by reducing the likelihood of breakdowns.

At Generators Direct, we offer a range of generators from leading brands, including Senci, Ford, Hyundai, Stephill, Pramac and many more.

If you’re not too sure which brand or model to go for, feel free to give our friendly experts a call on 01639 849847, we’d be happy to help!

4. How Well It’s Been Maintained and Cared For

Again, as with everything, proper maintenance is critical to extending the life of any generator, regardless of what type it is.

This means things like regularly changing the oil, replacing air and fuel filters, and checking coolant levels prevent internal components from deteriorating. Failing to regularly keep on top of these things can lead to issues like clogged systems, overheating, and engine failure.

As well as caring for the generator yourself, it’s also a good idea to schedule periodic professional servicing, ensuring that small issues are addressed before they become major problems.

5. Load Management

Last but certainly not least, it’s important to operate your generator at an appropriate load.

This is because running it consistently at or near its maximum capacity can strain the system, whereas on the other hand running it at very low loads might result in “wet stacking” in some diesel engines, leading to inefficiency and carbon buildup.

Proper load management ensures the generator performs optimally without unnecessary wear and tear.

Signs You Need a New Backup Generator

Your backup generator should typically last a long time, but as with any equipment, it will eventually need replacing, and here are just a few signs that it’s time to replace it…

• Frequent breakdowns – If your generator is often needing repairs or fails to start during critical times, it may no longer be a reliable source of power for you.
• Unusual vibrations or noises – Generators are typically loud, but any unusual sounds or vibrations during use may suggest severe mechanical or engine issues.
• Excessive fuel usage – If your generator seems to be consuming more fuel or producing less power, it might be time for a new one. This is typically the case with older models.
• Visible damage – it goes without saying that if you can see visible signs of corrosion, leaks, or worn-out components, your backup generator may be compromised and at risk of failure.

Browse our wide range of standby generators here, and if you’d like to learn more, check out our ultimate guide to standby generators.

How Long Do Backup Generators Run For?

So we know how long backup generators typically last for, and how to maximise their lifespan, but how long do they run for? Again, as with the lifespan, the runtime of a backup generator will all depend on a number of different things, such as the type of generator, fuel capacity, and the load it is supporting.

Typically speaking, portable backup generators with a 3000rpm engine have a run time of 6 to 20 hours on a single tank of fuel. This type of generator typically has a smaller fuel tank, holding 3 to 37 litres..

They are designed for short-term emergency use, such as during a few hours of a power outage. If a portable backup generator operates for more than 12-24 hours, it can strain the engine, which, as touched on previously, can lead to overheating or wear.

Standby generators with a 1500rpm engine on the other hand, can run for days to even weeks, as long as there is fuel available. Standby generators are connected to larger fuel supplies like propane tanks, natural gas lines, or diesel tanks.

While these generators are designed for extended use, they require periodic shutdowns for maintenance, like oil changes, every 100 to 200 hours of operation.

Looking For a High-Quality & Reliable Backup Generator?

At Generators Direct, we offer a range of backup generators, power stations and power banks for your specific needs.

All of our products are manufactured, tested and certified to industry standards, and come with a price promise – you won’t find prices cheaper anywhere on the web, but if you do, we’ll match them. In addition to this, all orders come with free mainland UK shipping and after sales support from our experts.

If you require additional advice or have a question for our team, don’t hesitate to get in contact with us using this form or via phone at +441639849847.