How Long Can a Generator Run?

Just how long can a generator run? Abt breaks down the lifespan of heavy-duty standby generators and portable generators.

First-time buyers may have lots of questions about generators, including whether or not they can totally replace a home electricity provider. The number one specification a first-time buyer tends to ask about is how long a generator will run. Knowing how long generators last offers insight into what appliances and electronics you'll be able to power. This knowledge will help you understand the difference between running a small unit or your entire home. Let's explore a bit more.

How Long Can a Standby Generator Run?

Standby Generator Running Time

As to whether you can say so-long to your power company, the answer is regrettably "no." Single generators should be used only as a backup power device and cannot run indefinitely, with a few caveats we'll discuss later.

While some generator models can run anywhere from eight to 12 hours, or even for multiple days, generators should never be left to run for weeks or months at a time. Essentially, this comes down to generators' engine construction, which requires not just fuel, but regular lubrication and routine maintenance. Portable generators specifically also require unleaded gas, and when the tank dries out, many models are designed with an auto shut-off to prevent damage.

High-quality generator models can run for several hundred hours, but this doesn't mean the engine won't die out without the required lubricant and fuel. Most generator manufacturers offer anywhere from one to five-year warranties along with after-sale services to fix any issues.

Standby Generator Durability

Generator manufacturers will even admit that their products will not last an entire lifetime. Although standby generators can run for hours on end, as we mentioned before, they are meant to be backup for emergency situations. These generators are quite durable machines, but in the end, a generator cannot run continuously. Although standby generators can run for long periods of time, it's important to note that generators' energy is not as affordable as the electricity providers' rates , so it's best to switch back to your primary source of electricity once power is back up and running.