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Solar Interconnect in Kailua

The code-correct electrical tie-in between your PV or battery system and your Kailua home’s service: AC disconnect, busbar sizing, line- or load-side connection, HECO and permit handled.

Solar Interconnect · Kailua

The panels are not the hard part. The interconnect is.

A solar interconnect is the electrical connection that ties a PV array, inverter, or battery system into your home’s service panel safely and to code. It is the AC disconnect, the backfeed breaker placement, the busbar capacity math, the line-side or load-side tap, the labeling an inspector looks for, and the HECO paperwork that has to match what was actually installed. The modules on the roof are the visible part. The interconnect is where a job passes or fails inspection.

Kailua homes run into this constantly. A 100 or 125 amp panel often cannot legally take a backfeed solar breaker under the 120 percent busbar rule, so the tie-in needs a main breaker derate, a line-side tap ahead of the main, or a service and panel upgrade. Getting that decision wrong is what leaves a system shut off for weeks waiting on a correction. We do the load calculation and the busbar math first, then tell you exactly which path your panel needs with a written number.

We are the licensed electrician that makes the connection right, whether your panels came from another installer, your old system needs to be re-tied after a panel upgrade, or you are adding a battery or EV charger to an existing array. We coordinate the HECO interconnection and net-metering side, pull the electrical permit, install the disconnect and labeling to code, and carry it through inspection so the system is legal to run, not just wired up.

Solar photovoltaic AC disconnect at an electrical service panel in Kailua, HI

What’s Included

Every Kailua interconnect starts with the busbar math, not the breaker. Here is what is included.

✓
Busbar & 120% load calcWe run the busbar capacity and load calculation before committing to a tie-in method, not after a failed inspection.
✓
Line- or load-side connectionThe right tie-in for your panel: load-side backfeed, main breaker derate, or a line-side tap ahead of the main.
✓
Code AC disconnect & labelingVisible, lockable AC disconnect and the placards an inspector and HECO both require, installed correctly.
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Upgrade options if neededIf the panel cannot take it, you get priced options: derate, line-side tap, or a service and panel upgrade.
✓
HECO & permit coordinationElectrical permit pulled and the HECO interconnection and net-metering side coordinated to match the install.
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Inspection-ready documentationOne-line and labeling documented so the inspection and the utility approval are not stuck on missing paper.

How It Works

Four steps from your service panel to a system that is legal to switch on.

01

Assess Service

We read your panel, service size, and busbar rating and run the 120 percent calculation for your system size.

02

Engineer the Tie-In

We determine the correct method: load-side, main derate, or line-side tap, and quote it with options in writing.

03

Install & Label

AC disconnect, breaker or tap, and code labeling installed cleanly, with coastal-rated hardware where exposed.

04

HECO & Inspection

Permit and HECO interconnection coordinated and carried through inspection so the system is cleared to run.

Why Sparky

✓

Interconnect Done to Code

Busbar math, disconnect, and labeling done right the first time so the system passes inspection and HECO.

⚡

Works With Any Installer

We tie in systems regardless of who supplied the panels, including re-ties after a panel upgrade.

⚠

Salt-Air Hardware

Exterior disconnects and conduit built for Kailua coastal exposure so the tie-in does not corrode out.

Frequently Asked Questions

What exactly is a solar interconnect?
It is the electrical connection that ties your PV, inverter, or battery system into your home’s service panel safely and to code. It includes the AC disconnect, the breaker or tap method, the busbar capacity check, and the labeling and HECO paperwork. It is the part of a solar project that determines whether the system is legal to switch on, separate from the panels on the roof.
Do you install the solar panels too?
Our role is the licensed electrical interconnect, the tie-in between the system and your service. We work alongside whatever PV or battery equipment you have, including systems supplied by another installer. If you need the array and the electrical handled together, tell us what you are planning and we will scope the electrical side and coordinate the rest.
Why might my panel need a derate or upgrade for solar?
The NEC 120 percent rule limits how much backfeed a busbar can take based on its rating and the main breaker. Many older Kailua 100 and 125 amp panels cannot legally accept a solar breaker as-is. The fix is a main breaker derate, a line-side tap ahead of the main, or a service and panel upgrade. We do the math first and tell you which one your panel actually needs.
Line-side tap or load-side breaker, which do I need?
It depends on your busbar rating, main breaker size, and system size. A load-side breaker is simplest when the panel has headroom. When it does not, a line-side tap ahead of the main or a derate is the compliant path. We run the calculation for your specific panel and explain which method applies and why before any work.
Can you re-tie my system after a panel upgrade, or add a battery later?
Yes. Re-tying an existing array onto a new panel and adding a battery or EV charger to an existing solar system are both common. We make sure the new combined load and backfeed still satisfy the busbar rule and that the disconnect and labeling are updated so the whole system stays compliant, not just the new part.
Do you handle the HECO and permit side?
Yes. We pull the electrical permit and coordinate the HECO interconnection and net-metering side so the documentation matches the installed system. Mismatched paperwork is a common reason a finished system sits unable to legally export, so we keep the install, the one-line, and the utility side aligned through inspection.

Other Kailua Services

Kailua Panel Upgrades200A service to take the backfeedLearn more → Kailua EV Charger InstallAdd a charger to your systemLearn more → All Kailua ServicesResidential & commercial menuLearn more →

Get a Free Kailua Interconnect Quote

Send us your panel size and system details. We run the busbar math and quote the compliant tie-in with options.

Request Power My Project → ☎ (808) 342-8195