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>

What size generator do I need to run a fridge?

• <div><p>While the rating will tell you how many watts the refrigerator needs at the peak of its cycle, it requires additional wattage to start. At the bare minimum, you’ll need a 1,500-watt generator to get the fridge up and running after a blackout. A 2,000-watt generator should be sufficient for most home refrigerators.</p></div>

What types of fuel do generators take?

• <div><p>Generators run on a variety of fuel types, ranging from natural gas to solar power. Keep in mind that fuel costs varying by type:</p><ul><li><p>Natural gas: $2,000–$21,000 per year </p></li><li><p>Liquid propane: $2,000–$21,000 per year</p></li><li><p>Diesel: $3,000–$20,000 per year</p></li><li><p>Gasoline: $500–$3,000 per year</p></li><li><p>Solar generator: $2,000–$25,000 per unit</p></li><li><p>Battery backup: $10,000–$25,000 per unit</p></li></ul><p></p></div>

Get matched with top generator install pros in Lahaina, HI

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>

Q: Can you run a whole-house generator constantly?

• <div><p>Yes, whole-house generators run constantly for extended periods. Whole-house generators can run for longer periods of time than portable generators, but be careful. First, they may need regular applications of engine oil (as frequently as daily), depending on the engine design. Second, running constantly for several days will increase the wear and tear on the generator and shorten its lifespan.</p></div>

Enter your ZIP and get matched with up to 5 pros

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 October 30, 2025

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
Request a quote
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
Request a quote
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
Request a quote
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.
Request a quote
Reviewed in June 2015
general work
Cruisin Maui
Request a quote
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
Request a quote
Reviewed in October 2013
These guys were awesome. Friendly, helpful and right on time. They said they needed about three hours so we dropped off the truck and went hiking around Kahalui. Came back in 3 hours, had to wait for about 15-20 minutes for them to button everything up and the job was done. The installed an...
ACE AUTO GLASS INC
Request a quote
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
Request a quote
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
Request a quote
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
Request a quote

Find Generator install pros in Lahaina

William Young

William Young

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

260 Lalo St. Unit D2

No reviews yet

MARZAN ELECTRIC

260 Lalo St. Unit D2

No reviews yet

49 years of experience

FULL SERVICE ELECTRICAL CONTRACTING

Island Bounce Maui LLC

PO Box 1661

No reviews yet

Island Bounce Maui LLC

PO Box 1661

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

98-1038 Moanalua Rd

4.20(

)

Power Generation Industries

98-1038 Moanalua Rd

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

312 Prospect Ave

2.00(

)

My Classic Car Trader LLC

312 Prospect Ave

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

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.

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.

Yes, whole-house generators run constantly for extended periods. Whole-house generators can run for longer periods of time than portable generators, but be careful. First, they may need regular applications of engine oil (as frequently as daily), depending on the engine design. Second, running constantly for several days will increase the wear and tear on the generator and shorten its lifespan.

While the rating will tell you how many watts the refrigerator needs at the peak of its cycle, it requires additional wattage to start. At the bare minimum, you’ll need a 1,500-watt generator to get the fridge up and running after a blackout. A 2,000-watt generator should be sufficient for most home refrigerators.

Generators run on a variety of fuel types, ranging from natural gas to solar power. Keep in mind that fuel costs varying by type:

Natural gas: $2,000–$21,000 per year
Liquid propane: $2,000–$21,000 per year
Diesel: $3,000–$20,000 per year
Gasoline: $500–$3,000 per year
Solar generator: $2,000–$25,000 per unit
Battery backup: $10,000–$25,000 per unit

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.

See all articles

Breyden Kellam
•
Aug 14, 2025Aug 14, 2025
How Much Does Whole-House Generator Maintenance Cost? [2025 Data]
Keeping on top of generator maintenance and repairs gives you extra peace of mind as a homeowner. Find out how much regular generator maintenance costs.
Alison Kasch
•
Oct 29, 2025Oct 29, 2025
How Much Does It Cost To Install a Generator Transfer Switch? [2025 Data]
The cost to install a generator transfer switch depends on several factors. Our guide will help you understand all of the costs.
Elisa Greenberg
•
Aug 14, 2025Aug 14, 2025
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.
Michelle Nati
•
Apr 1, 2025Apr 1, 2025
Can a Whole-House Generator Run an Air Conditioner?
A whole house generator can keep your home running during a power outage, but can it handle the energy demands of an air conditioner? Here’s what to consider.
Melissa Graham
•
Mar 7, 2025Mar 7, 2025
How Much Propane Does a Whole-House Generator Use?
When the power goes out, your whole house generator can keep your home running if it has enough propane to fuel it. Read our guide to propane use for whole house generators to determine how much you need.
Tyler Lacoma
•
Mar 26, 2025Mar 26, 2025
Pros and Cons of a Whole-House Generator
Whole house generators can power homes when electric problems hit, but they aren’t for everyone. Here’s what you should know when you’re thinking about buying.