Batteries on Oahu and Maui

How much does a battery cost in Hawaii in 2026?

One 13.5 kWh home battery, installed with new solar, costs $13,000 to $16,000 on Oahu and Maui in 2026. Adding one to a system you already have costs $14,500 to $17,500.

Prices before incentives. Your final price comes after a site visit. Updated Mon 7 Dec 2026.

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Battery and solar prices in 2026

What you buy	Installed price	Source and date
One 13.5 kWh battery, with new solar	$13,000 to $16,000	IEH price table, 1 Dec 2026
One 13.5 kWh battery, added to an existing system	$14,500 to $17,500	IEH price table, 1 Dec 2026
Solar panels	$4.00 to $4.60 per watt	IEH price table, 1 Dec 2026

Prices valid until 31 Jan 2027. Tax credits, rebates and utility programs are not included. Ask us which apply to your home.

Adding a battery to an existing system costs more because it has to work with the inverter and electrical panel you already have. We add batteries for systems from any installer, including ones no longer in business.

What one battery home made in its first 90 days

A Mililani home with 18 panels (7.74 kW) and one battery, installed in September 2026. We share the numbers with the owner's permission, without their name or address.

Made in 90 days3,012 kWh8 Sep to 6 Dec 2026. Owner's monitoring app

Expected2,890 kWhSame months. Google Solar API

Against expected4% aboveIEH 90-day report, 7 Dec 2026

Saved, about$1,139Estimate: 3,012 kWh × $0.42 × 0.90 used at home

Of 46 owners who got a 90-day report since 9 Nov 2026, 41 made within 10% of the expected amount or more. The other 5 were passed to our repair team. One home's result does not predict yours; $0.42 per kWh is an example Oahu residential rate.

Questions about battery cost

Do I need a battery on Oahu?Usually yes. Export credits on Oahu are low, so a battery lets you use your own solar power in the evening instead of selling it cheaply.

Are tax credits included in these prices?No. The prices above are before any incentive. Incentive rules change, so a person on our team confirms what applies to your home.

Can you add a battery to solar another company installed?Yes, for $14,500 to $17,500 for one 13.5 kWh battery. If your system seems to make less than it used to, check that first.Check if your system is underperforming

How many batteries do I need?

What happens in a power outage?

About this page

Prices: IEH price table, 1 Dec 2026
Valid until: 31 Jan 2027
90-day result: IEH owner reports, 7 Dec 2026
Expected output: Google Solar API
Incentives: Not included
Reviewed: By IEH, Mon 7 Dec 2026

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