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Generator Installers in Hawaii: Standby & Home Battery

Find generator and home battery installers in Hawaii. We've gathered 10 installers from across Hawaii with their phone number, address, hours, and Google rating, so you can compare and reach out for quotes. Listings span Kailua, Kailua-Kona, Princeville, Kahului, Lihue and Ewa Beach and more, so there's likely an installer near you. The installers below average 4.7 stars on Google. The average Hawaii home uses about 495 kWh a month, or roughly 17 kWh a day, so size the generator or battery to the circuits you actually need during an outage rather than the whole house.

Before you get quotes in Hawaii: size your backup

Generator sizing calculatorRunning + starting watts for your homeHome battery sizingkWh and kW for the loads you want backed upGenerator runtimeFuel use and hours per tank

Hawaii at a glance

42.9¢
per kWh, residential

#1 most expensive of 51

$212.12
average monthly bill

EIA, 2024 annual avg

495 kWh
average monthly use

EIA, 2024 annual avg

20 h
from a 13.5 kWh battery

At the state's average load of 0.69 kW; longer on essentials only

10 generator and home battery installers in Hawaii

Spread across Hawaii so there's likely one near you. Enter your ZIP above to sort nearest-first. Details from public Google Business Profiles: verify before hiring.

How to choose a generator or battery installer in Hawaii

Licensed electrician for the transfer switch (NEC 702)

A standby generator or home battery is connected through a transfer switch or backup gateway that must isolate your home from the utility so the system can never backfeed the grid (NEC Article 702 for optional standby systems, Article 706 for stationary batteries). That is licensed electrical work in Hawaii; a dealer that subcontracts it should name the electrician on the quote.

Gas line, pad placement, and the mechanical permit

A natural-gas or propane generator needs a licensed gas fitter to size and run the fuel line, and the unit must sit on a level pad at the clearance the manufacturer and your local code require from windows, doors, and vents because of carbon-monoxide risk. Expect an electrical permit and, in most jurisdictions, a mechanical or gas permit, each with an inspection.

Size to your real outage loads, then compare quotes

Ask every installer for a load list: which circuits get backed up (furnace blower, well pump, fridge, sump pump, central air) and their starting watts. Compare quotes on the same generator kW or battery kWh and kW rating, the transfer-switch type (automatic vs. manual, whole-house vs. managed circuits), the warranty, and who handles the annual service.

What to know before hiring in Hawaii

The largest utilities serving Hawaii homes are Hawaiian Electric Co (276,206 residential customers, 42.9¢/kWh), Hawaii Electric Light Co (78,386 residential customers, 48.3¢/kWh) and Maui Electric Co Ltd (61,811 residential customers, 44.0¢/kWh). Your utility sets the rate your backup power replaces, and it is also who an installer files interconnection or service paperwork with, so name it when you ask for quotes.

Check the license before you sign

Electrical contractors in Hawaii are licensed by the Hawaii DCCA Board of Electricians and Plumbers. Journey Worker, Supervising and Specialty electrician licenses; electrical contractors (C-13) are licensed by the DCCA Contractors License Board.

Look up a licenseBoard siteLinks checked 2026-10-19

Listing data is sourced from public Google Business Profiles and may be out of date. WattSimple is not affiliated with, and does not endorse or recommend, any listed company. Verify licensing and details directly before hiring.

Bridge the gap before the install

A standby generator or home battery takes weeks from quote to inspection. A portable inverter generator covers the fridge, furnace blower and electronics in the meantime, and stays useful as a backup to the backup. Size it with the generator sizing calculator, and run it outdoors, well away from doors and windows.

We earn a commission if you buy through links on this page, at no extra cost to you. It does not change what we recommend. See our affiliate disclosure. As an Amazon Associate I earn from qualifying purchases.

All inverter generator picks

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Frequently asked questions

Look for a factory-authorized dealer or a licensed electrician who installs standby generators regularly, and confirm who runs the gas line (a licensed gas fitter or plumber). The quote should name the generator kW rating, the transfer switch, the pad, the fuel-line run, the electrical and mechanical permits Hawaii requires, and the inspection. Get at least three written quotes on the same system size.

Plan your backup power

Generator sizing calculator

Running and starting watts for the circuits you back up.

Home battery sizing

kWh and kW for a battery that covers your outages.

Home battery cost

Installed price by capacity and brand class.

Hawaii electricity rates

What you pay per kWh today in Hawaii.

Standby generator installation cost

What drives the installed price.

Battery backup vs. generator

Which one fits your outages.

All statesTransfer switches explainedAll installer directories
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