How do I know what size of whole house generator to choose?

• <div><p>Generators are usually sized by running watts and starting watts. Ideally, you’ll want a generator that can offer both the necessary running watts and starting watts for everything you need to power without going beyond 90% of its capacity. <a href="https://www.angi.com/articles/electrical-load-calculation.htm">Calculate your home’s electrical load</a> based on the breakers in your home or adding up the appliance and lighting needs of connected rooms.</p></div>

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Q: Do installations include unit assembly?

• <div><p>Many services include assembling the unit and securing it in the window. Confirm with your provider.</p></div>

Q: Can I use a generator to charge a back-up battery?

• <div><p>Yes. You can connect your home back-up battery to a generator with its designated charger. Be sure that the output of the generator matches the input requirements for the battery for best results.</p></div>

Q: How much horsepower do I need?

• <div><p>If your home already has a grinder pump and you&rsquo;re still noticing issues (like frequently clogged toilets and sinks), it could be time to upgrade your grinder pump. Start by checking your existing horsepower. If there are four or fewer people living in your home, using a 1/2-horsepower grinder pump should be sufficient. Larger households should consider investing in a 1-horsepower grinder pump to maximize wastewater removal efforts.</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 Harris, MI

*The Angi rating for Generator Install companies in Harris, MI 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 Harris, MI 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 May 07, 2026

Reviewed in May 2026
He built a pole barn from start to finish and we couldn’t be more happy with his work. He is a hard worker who showed up on time everyday when he said he would be there.
Eric Gustafson
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Reviewed in February 2024
Removed ugly wood paneling on bedroom wall, hung drywall, painted all three bedrooms and living room, painted and installed new trim. I am thrilled with the promptness and precision of JCâ s work. A pleasure to work with this professional company!
JC Painting and Maintenance
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Reviewed in November 2023
Also installed 2 rubber roofs. Excellent work.
FLAT OUT PROFESSIONAL ROOFING LLC
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Reviewed in June 2023
Jason was quick to start the project and is doing a great job
Michigan Inspection & Construction of Homes, Inc.
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Reviewed in October 2022
Eric was trustworthy and followed through on whatever he had said.
EDI PAINT LLC
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Reviewed in May 2016
Installation went very smoothly. Workers were efficient and friendly. We are very pleased with the results.
Budget Windows
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Reviewed in September 2014
Sand G replaced a 12 year old roof (installed by another contractor) that had been leaking water badly into the soffits. They did a nice job reviewing my concerns and inspecting the old roof with me ahead of time. Work began exactly on the date that was scheduled, which I thought was...
S & G ROOFING & SIDING
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Reviewed in July 2014
<p> Did not go well. Everything was fine until I changed my mind about adding a second zone to heat my basement. I was unsure to begin with, but was assured I would love it. Well I didn't and stopped the installation of the auxiliary heating unit for the basement. I didn't know that it was...
Bugay Heating & Cooling
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Reviewed in November 2012
Randy was prompt in installing our first screen on the wall. All of the wires were hidden in the wall and he made sure everything was cleaned up. He even made sure our HD was working.
ACDC Solutions
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Reviewed in November 2012
We recieved a mailing about American Metal Roofs, my husband was interested in getting a metal roof so we called. The president of the company came to our home to meet with both my husband and I. He explained and showed us in great detail how the roof is installed and about the materials used...
American Metal Roofs of Northern WI
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Generator Install questions, answered by experts

Many services include assembling the unit and securing it in the window. Confirm with your provider.

Yes. You can connect your home back-up battery to a generator with its designated charger. Be sure that the output of the generator matches the input requirements for the battery for best results.

If your home already has a grinder pump and you’re still noticing issues (like frequently clogged toilets and sinks), it could be time to upgrade your grinder pump. Start by checking your existing horsepower. If there are four or fewer people living in your home, using a 1/2-horsepower grinder pump should be sufficient. Larger households should consider investing in a 1-horsepower grinder pump to maximize wastewater removal efforts.

Generators are usually sized by running watts and starting watts. Ideally, you’ll want a generator that can offer both the necessary running watts and starting watts for everything you need to power without going beyond 90% of its capacity. Calculate your home’s electrical load based on the breakers in your home or adding up the appliance and lighting needs of connected rooms.

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 Harris, MI homeowners’ guide to generator installs

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

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