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>

• <div><p>When installed and used correctly, generators are safe to use. The <a href="https://www.angi.com/articles/power-out-3-tips-safely-operate-home-generator.htm">most critical generator safety tips</a> to keep in mind are:</p><ul><li><p>Never use a portable generator inside an enclosed space, as the carbon monoxide exhaust it creates is lethal.</p></li><li><p>Never attempt to connect your generator to your home’s electrical panel independently; hire a professional for this dangerous job.</p></li><li><p>Never overload your generator by connecting more appliances than for which it’s rated; you can damage your generator and appliances or even cause a fire.</p></li></ul><p></p></div>

Get matched with top generator install pros in Lahaina, HI

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: How do I reduce AC startup power for a generator?

• <div><p>To reduce AC startup power for a whole-house generator, install a soft start kit or hard start capacitor, which lowers the initial surge by gradually ramping up the compressor. Using a smart load manager can also help by staggering startup loads, preventing a system overload and future costly repairs.</p></div>

Q: Do you have to turn off the main breaker when using a generator?

• <div><p>As a safety measure, you should always turn off the main breaker while operating your generator&rsquo;s backup breaker. In addition, you should also switch off all appliance breakers so you don't have a power surge when the main breaker turns back on. And finally, turning off the main breaker prevents back-feeding, which endangers utility workers with the risk of electrocution. Back-feeding could also destroy the electrical circuits of your neighbors if they use the same power network.</p></div>

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Verified Reviews for Generator Install pros in Lahaina, HI

*The Angi rating for Generator Install companies in Lahaina, HI 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 Lahaina, HI 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 November 20, 2025

Reviewed in November 2025
I have employed Ekolu for multiple small projects. As a licensed General Contractor I have enjoyed providing work always, he shows up, and get's the job done well.
LFF Construction & Renovations
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Reviewed in February 2025
General cleaning was immaculate and done efficiently. The walls, the ceilings and the baseboards were included. The windows and screens of the entire 2story house were also cleaned. The maintenance visit kept my bathrooms shiny and bright. My adult son took photos after the cleaning to show...
Sparkle and Shine Cleaning Service
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Reviewed in July 2021
STILL IN BUSINESS. NEW NAME: Hartman Pacific Construction. Ho Hawaii.com Did my floors. Top notch quality install. I am retired military and I know attention to detail. Will bend over backwards to make sure job is done right. Has his general contractor license now. Does it all. One stop shopping.
Hartman Pacific Construction
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Reviewed in July 2018
This company charged me $512 to install a kitchen faucet. Steve's Plumbing is so overpriced I can't even believe it.
Steve's Plumbing & A/C Service
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Reviewed in April 2016
Their rep didn't seem as knowledgeable about the particulars of the solar system as the other company. They made their appointment and they kept their appointment. The rep should have a general knowledge of the whole process because you have to deal with the electric company. There's a whole...
Haleakala Solar Inc.
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Reviewed in June 2015
general work
Cruisin Maui
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Reviewed in January 2014
They did not know how to install the faucet so I had to buy a new one and then I got it installed by somebody else. It was leaking after they fixed it so I had to buy another one. It was a father son team; the father was great but the son not so much. They didn’t come out like for a year and...
James A Wheat & Sons Inc
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Reviewed in November 2012
Pete is a no-nonsense, honest, and efficient worker. He picked up my generator on a Saturday and returned it the following day with complete explanation of what he did and what I should do to prevent further problems. Would definitely use him again.
Pete's Small Engine Repair
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Reviewed in November 2012
It was wonderful. The staff was great and communicated very well. The installation is beautiful and the materials were better than we anticipated. A+++ rating to them! We will be back!
Exclusively Yours
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Reviewed in March 2012
I was generally happy with the job. I wish he would have done final inspection a little bit better.
JEFF'S PLUMBING
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Find Generator install pros in Lahaina

William Young

5.00(

)

•Approved Pro

William Young

5.00(

)

•Approved Pro

Customers say: Quick response

Recommended by 100% of Angi customers

45 years of experience

45+

"Absolute professionals, got the job done very quickly and on budget. Amazing consideration working with and around other trades on the site. Would absolutely recommend."

Sean C on July 2024

45+

"Absolute professionals, got the job done very quickly and on budget. Amazing consideration working with and around other trades on the site. Would absolutely recommend."

Sean C on July 2024

MARZAN ELECTRIC

No reviews yet

MARZAN ELECTRIC

No reviews yet

49 years of experience

FULL SERVICE ELECTRICAL CONTRACTING

Island Bounce Maui LLC

No reviews yet

Island Bounce Maui LLC

No reviews yet

13 years of experience

Friendly and affordable, Island Bounce Maui LLC is a local family owned and operated company bringing inflatable bounce house rentals, face-painters and more to the island of Maui.

Power Generation Industries

4.20(

)

Power Generation Industries

4.20(

)

Customers say: Terrific value

11 years of experience

We are proud to be Hawaii's interface for our expert services. We offer many services and are linked, networked throughout the islands. We are ready standing by.

My Classic Car Trader LLC

2.00(

)

My Classic Car Trader LLC

2.00(

)

53 years of experience

Sales, Service & Rebuilding of Antique and Classic Car Components such as, Carburetors, Starters, Generators, Fuel Pumps, Double & Single Action Fuel Pump Rebuilding, Water Pumps, Hydraulic Top Pumps, Distributors, and DELCO Knee Action Shocks, We also carry a complete line of NOS and NORS parts. We offer FREE Technical advice for any YEAR Classic Car 609-462-7412

"Beware. They charged me double shipping even after I told them I would wait so I wouldn’t have to pay two shipping fees. The last item was a fuel pump that I had a problem with. I have made 4 calls to ask for help with no return call. Poor"

Frank H on July 2020

"Beware. They charged me double shipping even after I told them I would wait so I wouldn’t have to pay two shipping fees. The last item was a fuel pump that I had a problem with. I have made 4 calls to ask for help with no return call. Poor"

Frank H on July 2020

Generator Install questions, answered by experts

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

To reduce AC startup power for a whole-house generator, install a soft start kit or hard start capacitor, which lowers the initial surge by gradually ramping up the compressor. Using a smart load manager can also help by staggering startup loads, preventing a system overload and future costly repairs.

As a safety measure, you should always turn off the main breaker while operating your generator’s backup breaker. In addition, you should also switch off all appliance breakers so you don't have a power surge when the main breaker turns back on. And finally, turning off the main breaker prevents back-feeding, which endangers utility workers with the risk of electrocution. Back-feeding could also destroy the electrical circuits of your neighbors if they use the same power network.

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.

When installed and used correctly, generators are safe to use. The most critical generator safety tips to keep in mind are:

Never use a portable generator inside an enclosed space, as the carbon monoxide exhaust it creates is lethal.
Never attempt to connect your generator to your home’s electrical panel independently; hire a professional for this dangerous job.
Never overload your generator by connecting more appliances than for which it’s rated; you can damage your generator and appliances or even cause a fire.

The Lahaina, HI 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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•
Oct 29, 2025Oct 29, 2025
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How Much Does a Whole-House Generator Cost? [2025 Data]
The average cost of a whole-house generator falls between $5,000 and $25,000. Keep reading to learn how much you can expect to spend.
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•
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How Much Does Whole-House Generator Maintenance Cost? [2025 Data]
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Apr 1, 2025Apr 1, 2025
Do Natural Gas Generators Produce Carbon Monoxide? A Complete Guide
Natural gas generators emit carbon monoxide, a harmful gas. Learn about what carbon monoxide is and tips to operate your generator safely.
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What Size Generator Do I Need? A Guide to Choosing the Right Generator for Your Home
Emergency generators come in many types and sizes to suit various needs. If you’re wondering what size generator to buy, here’s what to consider.
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•
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How Much Does It Cost to Run a Standby Generator?
How much does it cost to run a standby generator? The answer varies based on the type and size of the generator. Find out more.