Severe weather can cause outages lasting for hours or even days on end. Whole-house generators can ensure that you stay online and comfortable in your home. These units can be extremely helpful for those who work from home, have young children, or critical medical needs.
But how long can a whole-house generator run? This outage planning guide will explain generator runtime expectations so you can understand your generator’s limits. Be ready for the next storm with this useful guide to generator runtimes.
Generator Types
First, we must address the two types of generators: standby vs. portable units.
Standby Generators
Standby generators are stationary whole-house generators designed to provide reliable power to a home for up to several days depending on their size, fuel source, and power demands. Standby generators are made for long span power emergencies and use an Automatic Transfer Switch to automatically kick on during an outage.
If in great condition, this type of generator can power a medium sized home for up to 3,000 hours in total. So, if you have several power outages a year at an average runtime of 30 hours per outage, plus maintenance time, your generator can last a very long time. It is recommended not to run your generator for more than 500 hours straight.
Portable Generators
Portable generators can typically run for up to 2,000 hours in total. Portable units are much smaller than standby generators and must be operated manually. They are designed to run for shorter increments, such as 6-18 hours at a time.
They aren’t designed to power your whole house but can come in handy if you own an RV or need to power a select few appliances at home during an emergency outage. Overall, portable generators are not recommended for long-term use during an extended power outage.
Fuel types
The specific fuel type also impacts the runtime of your generator. Let’s explore the main generator fuel types.
Natural Gas
Whole-house generators often run directly off your natural gas line at home and connect into the utility line for an unending supply of fuel. In this case, generators that run off natural gas are typically able to run the longest. There is no fuel tank to refill, so as long as the gas line is operating, the generator will have fuel.
Propane
Propane is a common fuel source for generators. Propane has a very long shelf life compared to diesel and gas. This means you won’t have to worry about the propane in the tank going bad. Propane generators must be refueled every once in a while, making it harder to run continuously.
Diesel
Diesel generators are less common. Their runtime relies on how much diesel you can feasibly access and store in tanks. Diesel can also be expensive at times, prohibiting some owners from having an ample supply.
How Load Size Affects Run Time
One more factor impacts generator runtime, and that’s load size. Your generator is only able to handle a certain electrical load. The closer you get to that limit, the harder your generator must work.
So, if you run high-demand appliances continuously, such as HVAC systems, refrigerators, freezers, and microwaves, it causes the generator to consume fuel more quickly. As the load increases, fuel efficiency decreases, which shortens overall run time.
It’s best to balance your electrical usage to extend generator runtime. You can do this by:
- Limiting the number of high-demand appliances you run at once
- Cycling high-demand appliances instead of running them all simultaneously
- Prioritizing essential loads over nice-to-haves
Managing your load size helps maximize fuel efficiency as well as reduce wear on your system, resulting in more reliable performance over time.
Why Regular Maintenance Is Important
Routine generator maintenance is essential to ensure your system is ready when you need it. Regular upkeep helps identify small issues before they spiral into breakdowns or costly repairs, especially during extended use.
Checking oil levels, inspecting air filters, testing the battery, and monitoring fuel quality are all basic tasks that help prolong the life of your generator. A well-maintained generator performs better and consumes fuel more efficiently, helping it run longer.
Regular maintenance also reduces wear and tear over time, extending the lifespan of your unit. Skipping routine service can lead to higher fuel consumption, poor performance, and costly repairs.
Schedule Generator Maintenance
Keep your generator in tip-top shape with routine maintenance from Mercurio’s. Our generator technicians are highly skilled in performing regular maintenance tasks. We’ll ensure your generator is ready to go for when you need it next.
Call us at (360) 499-2980 or schedule online.
