A 2,000 sq ft house typically needs a 15kW to 22kW generator for whole-home backup, especially if you want to run major appliances, HVAC equipment, and central air conditioning. A 7,500 to 10,000-watt portable generator may be enough for essentials like lights, a refrigerator, internet, a furnace blower, and a sump pump.
Author: Barret Abramow
Barret Abramow
Barret our Project manager and co-owner is a skilled electrician with a strong foundation in both hands-on electrical work and business operations. A graduate of Hofstra University with a degree in Management, he combines technical expertise with a sharp understanding of project planning, customer service, and efficient business practices. As co-owner of Grounded Electric, Barret is dedicated to delivering high-quality electrical solutions while ensuring the company operates with integrity, professionalism, and a customer-first mindset.
Generac generator costs usually range from $500 to $2,500 for portable units, $4,000 to $10,000 for automatic home standby generators, and $8,000 to $16,000 for many professionally installed systems.
How much Generac generators cost can change based on the generator type, generator size, fuel setup, transfer switch, electrical work, permits, and site conditions. A full standby system costs more because it connects to the home’s electrical system and often runs on natural gas or propane.
Installation can add several thousand dollars to the project, so the unit price should not be confused with the full installed cost.
A Generac home standby generator can run for several days or longer with a steady fuel supply, proper airflow, and regular maintenance checks. How long a Generac generator will run varies by model, fuel source, electrical load, and operating conditions.
Natural gas units may run longer if utility service stays active, while propane and gasoline models depend on tank size and fuel availability.
A generator can run without electricity as long as it has fuel, oil, airflow, and safe operating conditions. In most cases, how long a generator can run without electricity ranges from 6 to 18 hours for portable models, while standby generators may run for days with a steady natural gas supply or a large propane tank. Runtime depends on generator type, tank size, electrical load, and maintenance.
Generator lifespan depends on runtime hours, service history, and operating conditions. Generator life expectancy maintenance hours show how long a unit can run before service, major repair, or replacement becomes likely.
Portable generators often last 1,000 to 2,000 hours, standby units may last 1,500 to 3,000 hours, and diesel systems can reach 10,000 to 30,000 hours with proper maintenance. Most generators need service once a year or every 100 to 200 operating hours.
Generac generators are generally a good choice for homes that need reliable standby power during outages. Generac is known as a leading home standby generator brand, but its value depends on your power needs, fuel setup, budget, noise concerns, and service plan.
Generac generators are designed, engineered, and assembled through a mix of U.S. and global operations, with major manufacturing activity tied to Wisconsin.
The answer to where Generac generators are made depends on the model, since some units use domestic and foreign parts, and some engines have different origins. Generac says its G-FORCE and OHVI engines are made in Wisconsin, while OHV engines are made in Vietnam.
A Generac standby generator can often run for days during a power outage. It needs a steady fuel supply, good airflow, a balanced load, and regular maintenance.
How long a Generac generator can run depends on the generator type. It also depends on the fuel supply and tank size. The electrical load matters too. Service conditions can affect run time.
The answer to whether generators are waterproof is no, for most portable units. Portable and gas generators use open-frame designs that expose outlets, wiring, and engine components to moisture, creating risks of electrocution, short circuits, and engine damage when used without protection.
Inverter generators offer partial enclosure but are not rated for direct rain exposure. In contrast, standby generators are the exception, built with permanent weatherproof housings that operate through rain, snow, and cold. Any portable generator running in wet weather requires a rated running cover or enclosure and must always operate outdoors, at least 20 feet from the home.
A standard household refrigerator usually needs a generator rated between 2,000 and 3,000 watts during outages. Most refrigerators use about 600 to 800 running watts, but the compressor can briefly require more than 2,000 starting watts when it cycles on.
When determining what size generator to run a refrigerator, the safest approach is to account for both steady power use and startup surge, especially if lights, freezers, or furnace blowers will run at the same time.