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Verified Reviews for Generator Install pros in Hilo, HI

*The Angi rating for Generator Install companies in Hilo, 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 Hilo, 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 March 25, 2026

Find Generator install pros in Hilo

Avatar for DKN Electrical
DKN Electrical
4.9(
95
)
Fixed Generator - InstallGenerator - Install - For BusinessPortable Generator - Install

Serving Hilo, HI and surrounding areas

Approved

Super Service Award Winner

In business since 2020

Small jobs welcome

Credit card accepted

"Totally awesome company to work with. They will definitely be the first company I contact for my electrical needs!"
OVERVIEW OF KITCHEN PLUS LIVING
KITCHEN/LIVING
Upgrade of Fixtures
Upgrade of Fixtures
Upgrade of Fixtures

+6

Response time1 day
Response rate93%
2 neighbors recently requested a quote
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Avatar for Ultimate Electric LLC
Ultimate Electric LLC
4.3(
6
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install+4 more

Serving Hilo, HI and surrounding areas

Approved

In business since 2005

Free estimates

Emergency services offered

"Best electric company in Kona! I’m absolutely blown away by the level of professionalism and dedication Ultimate Electric provided me on many of my renovation projects. 100% satisfied with Daniel and his crew. He is always on time every time, consistently fast, easy to deal with and fairly affordable. I highly recommend!"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+34

2 neighbors recently requested a quote
Recommended by100%of homeowners
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Reiny P K Carvalho
New to Angi
Fixed Generator - InstallFixed Generator - Repair

Serving Hilo, HI and surrounding areas

In business since 2023

Free estimates

Credit card accepted

We are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

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Big Patriot Home Remodeling
New to Angi
Generator - Install - For Business

Serving Hilo, HI and surrounding areas

In business since 2020

Free estimates

Emergency services offered

Big Patriot Home Remodeling is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business.

Response time20 mins
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Blaz's Handyman Services
New to Angi
Portable Generator - Repair

Serving Hilo, HI and surrounding areas

In business since 2021

Credit card accepted

Offers commercial services

Blaz's Handyman Services, is committed to excellence in every aspect of our business! We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

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FIX'd The Handyman
New to Angi
Portable Generator - Repair

Serving Hilo, HI and surrounding areas

In business since 2021

Free estimates

We take great pride our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction, from the start to the completion of a project. order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

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Generator Install questions, answered by experts

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.

To determine the right size generator for your house, you should calculate the total wattage of the appliances and devices you want to power during an outage. List all essential items, note their start-up wattages, and add them together.

Here are some typical wattage requirements for common appliances:

  • Refrigerator: 600 watts

  • Large dehumidifier: 700 watts

  • Large window air conditioner: 1,400 watts

  • Water heater: 3,000 to 4,500 watts

  • Electric furnace: 5,000 to 25,000 watts

A 7,500-watt generator might be sufficient for essentials like a refrigerator, freezer, well pump, and lighting circuits. However, for high-demand items like a water heater or furnace, a whole-home generator is a better choice. A portable generator may be enough if you only need to power a few critical items.

While home square footage can offer a rough estimate, it is not always a reliable indicator. For reference, here are some typical generator sizes based on square footage:

  • 1,000 sq ft: 6–9 kW

  • 1,500 sq ft: 7–10 kW

  • 2,000 sq ft: 10–14 kW

  • 2,500 sq ft: 12–16 kW

  • 3,000 sq ft: 16–20 kW+

For the most accurate sizing, consult a professional who can calculate your home's peak and average power consumption and recommend the optimal generator.

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.

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

Generators are safe to use as long as they are installed and operated correctly according to the manufacturer's recommendations. The most critical safety tips are to never use a portable or fuel-powered generator inside an enclosed space due to the risk of lethal carbon monoxide poisoning; always operate it outdoors where fumes can dissipate away from your home. Additionally, never attempt to connect a generator to your home’s electrical panel yourself—hire a professional to ensure the setup meets safety standards. Finally, avoid overloading the generator by not connecting more appliances than it is rated for, as this can damage your equipment or cause a fire.

The Hilo, 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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