What size generator do I need for a 1500-square-foot house?

• <div><p>A 1,500 square foot home will likely need a 15kW to 20kW generator. When deciding on whole-house generator size, add up the <a href="https://www.angi.com/articles/how-many-watts-house.htm">total wattage</a> of the devices that you’d like to continue running during a power outage. That way, you can ensure you purchase a generator that can power your necessary appliances or medical equipment during an electrical emergency.</p></div>

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Q: How big of a generator do I need for a transfer switch?

• <div><p>You can determine what size generator you need for a transfer switch by matching the switch to the largest outlet on your generator. Larger generators can power up to 10 circuits, while most 5,000-watt generators can provide power to six circuits. So, if your generator&rsquo;s largest outlet is 30 amps, you&rsquo;ll need a 30-amp transfer switch.</p></div>

Q: Can a 10,000-watt generator run a central AC unit?

• <div><p>A 10,000-watt generator can run a small to mid-sized central AC unit (typically up to 3 tons or 36,000 BTU) along with a few other appliances. However, larger AC units or additional loads will require a bigger generator. Consult a local generator installer to ensure you add the correct size generator to your home.</p></div>

Q: What happens with the generator when the local power goes back on?

• <div><p>If you have a transfer switch properly installed, the generator and main electrical power cannot feed the system at the same time. However, you should still shut off the power at your main circuit breaker panel before activating the generator. If you do that, you&rsquo;ll simply need to shut off the generator and reset your circuit breaker once the local power comes back on.</p></div>

Q: What size generator do I need for a 2,500-square-foot house?

• <div><p>A home that is 2,500 square feet will likely need a 20kW to 25kW generator. Consult your local generator installer to confirm the generator size needed to power your home before purchasing a new one. Be sure to consider how much power your necessary devices need to run.</p></div>

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Verified Reviews for Generator Install pros in Mitchell, NE

*The Angi rating for Generator Install companies in Mitchell, NE is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Generator Install needs.

*The HomeAdvisor rating for Generator Install companies in Mitchell, NE is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Generator Install needs.

Last update on August 18, 2025

Reviewed in August 2025
Jason has done a lot of remodel work in our house. He redid our entire kitchen from the floor to the ceiling. They removed a drop ceiling, installed new cabinets, countertops, backsplash, and flooring. They most recently completed a floor to ceiling fireplace wall in the living room. I’m...
High 5 Home Solutions
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Reviewed in March 2024
Good overall experience. Good communication with sales representative and the installation crew. Installers were respectful of our property, did excellent work and cleaned up when done.
Renewal by Andersen of Wyoming
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Reviewed in January 2022
We plan on having them come back and do an addition to the deck they installed. The work was done efficiently and professionally. We love it!
JJL Carpentry, LLC
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Reviewed in July 2020
Very pleased with home advisory, went and took a look at my window and gave me a low quote and installed it perfectly.. thank u very much. I recommend home advisory to anyone with anything needing to be fixed...
Safe Site Services
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Reviewed in January 2018
did not bring electric heaters while waiting, took longer than expected, duct work not completed correctly, did not reimburse as heating/cooling bills were very high, motor went out in first 9 months of $7,500 unit. Were responsive, on time generally after initial install, made things right...
Gering Valley One Hour Heating and A/C
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Generator Install questions, answered by experts

You can determine what size generator you need for a transfer switch by matching the switch to the largest outlet on your generator. Larger generators can power up to 10 circuits, while most 5,000-watt generators can provide power to six circuits. So, if your generator’s largest outlet is 30 amps, you’ll need a 30-amp transfer switch.

A 1,500 square foot home will likely need a 15kW to 20kW generator. When deciding on whole-house generator size, add up the total wattage of the devices that you’d like to continue running during a power outage. That way, you can ensure you purchase a generator that can power your necessary appliances or medical equipment during an electrical emergency.

A 10,000-watt generator can run a small to mid-sized central AC unit (typically up to 3 tons or 36,000 BTU) along with a few other appliances. However, larger AC units or additional loads will require a bigger generator. Consult a local generator installer to ensure you add the correct size generator to your home.

If you have a transfer switch properly installed, the generator and main electrical power cannot feed the system at the same time. However, you should still shut off the power at your main circuit breaker panel before activating the generator. If you do that, you’ll simply need to shut off the generator and reset your circuit breaker once the local power comes back on.

A home that is 2,500 square feet will likely need a 20kW to 25kW generator. Consult your local generator installer to confirm the generator size needed to power your home before purchasing a new one. Be sure to consider how much power your necessary devices need to run.

The Mitchell, NE homeowners’ guide to generator installs

From average costs to expert advice, get all the answers you need to get your job done.

See all articles

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Jul 10, 2026Jul 10, 2026
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Whole home generator installations require a professional hand. Read this guide to help you decide which generator is best for your home.
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Generator Installation: Everything You Need to Know
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