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Whole-Home Generator Installation on Oahu

Standby generators sized, installed, and tested across Aiea, Honolulu, Kailua, and Kaneohe — ready before the next storm.

Generator Installation

Power Through Storm Season.

When a Kona storm or windward squall takes out a HECO line, the difference between a brief inconvenience and a multi-day mess is a properly sized generator. We install whole-home standby systems — the kind that auto-start when grid power drops and run your AC, fridge, lights, and Wi-Fi without you lifting a finger.

Sparky and Sons sizes generators based on actual load — not the catalog number. We meter your panel, talk through what you actually want running during an outage (whole house? essentials only? AC included?), and recommend the right Generac, Kohler, or Cummins unit for the job. Then we handle the gas-line coordination with your plumber, the concrete pad, the transfer switch, and the HECO permit.

For Kaneohe and Kailua especially — where storms hit hardest and HECO restoration takes longest — this is one of the highest-value upgrades you can make to a home. Most installs run 7–14 days from order to first auto-test.

Whole-home generator installation in Kaneohe, Hawaii

What’s Included

Every generator installation job covers the same scope — here’s exactly what you’re getting when you book us.

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Load calculationReal metering of your actual demand — not just adding up nameplate ratings.
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Generator sizing & sourcingGenerac, Kohler, Cummins — right unit for your load and budget.
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Concrete pad & placementCode-compliant placement (clearances, intake/exhaust direction).
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Auto-transfer switch200A or sub-panel ATS — sized to match generator and main panel.
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Gas-line coordinationLP tank or natural gas tap — we coordinate with your plumber.
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HECO permit & testingPermit, inspection, weekly auto-exercise scheduling, and a written warranty.

How It Works

Four steps from first call to written warranty. No surprises along the way.

01

Load Audit

Meter your actual usage, talk through what you want backed up, recommend size.

02

Permits & Sourcing

Pull permits, order the unit, schedule pad install and gas line.

03

Install Day

Pad, generator, ATS, wire to panel, plumb to gas. Usually 1–2 days.

04

Test & Train

Run the unit on grid loss, walk you through monitoring app, written warranty.

Why Sparky

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Real Sizing

We meter loads — we don’t guess. Your generator runs what you actually use.

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Permitted & Inspected

Every install permitted with City & County and signed off by inspector.

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Annual Service Plan

Optional yearly maintenance — oil change, filter, transfer switch test, battery.

Frequently Asked Questions

How big a generator do I need?
For an average 3-bedroom Oahu home with central AC, typically 18–22kW. Without AC, 14kW often works. We meter to be sure.
Does a standby generator run on propane or natural gas?
Both options exist. Most Oahu homes don’t have natural gas service, so we typically install with LP (propane) tanks. We coordinate that with your plumber.
How loud is a standby generator?
Modern units (Generac, Kohler) run around 60–65 dB at 7m — quieter than your AC condenser. We place them to minimize neighbor noise.
Can I add it later if I already have a panel?
Yes — we install an automatic transfer switch between your main panel and the new generator. Doesn’t require panel replacement in most cases.

Related Services

Panel UpgradeResidential serviceLearn more → Surge ProtectionResidential serviceLearn more → Commercial Backup GeneratorCommercial serviceLearn more →

Get a Free Generator Installation Quote

Written estimate on the first visit. No surprise charges, no salesman act — just a licensed electrician answering your questions.

Request Free Estimate → ☎ (808) 342-8195

Ready to Get Started?

Contact Sparky and Sons LLC today for a free, no-obligation estimate. We look forward to working with you.