Add a Battery to Existing Solar: $13,000 to $18,000 (2026)

Solar battery installation cost, storage cost and home battery backup cost

EnergySage Marketplace quotes in 2026 put an installed Tesla Powerwall 3 at $13,473, an Enphase IQ Battery 10C at about $13,000, and a FranklinWH aPower 2 at $17,655, all before incentives. Angi's range for a Powerwall is $9,000 to $12,000 and its range for a generic storage system is $6,000 to $12,000. Retrofit labor on its own is $2,000 to $3,500 (Angi, July 2026). The 30% federal residential clean energy credit (Section 25D) ended for property placed in service after December 31, 2025, so 2026 quotes are before state and utility incentives only.

Published installed prices for batteries added to existing solar, before incentives. Sources and dates per row; checked October 11, 2026.

Labor component published separately. Sources and dates per row; checked October 11, 2026.

Which batteries work with my existing solar system

Compatibility summary from manufacturer specifications; an installer confirms for the specific inverter.

AC-coupled batteries (Powerwall, Enphase, FranklinWH) are the usual answer for an orphaned system because they do not care who installed the array or which inverter it has. DC-coupled batteries need a compatible hybrid inverter and are only worth it when the inverter is being replaced anyway. The inverter replacement page covers that combination.

Adding a battery when the installer is out of business

No problem on the equipment side: the battery installer is certified by Tesla, Enphase or FranklinWH, not by your original installer, and the battery carries its own warranty. The two things to settle first are permission to operate (the utility must approve the battery interconnection, and some utilities require the original system to be in good standing) and the panel-level monitoring access, which the installer should transfer to you during the job. If your installer is gone, check the bankruptcy tracker for who holds your account, then come back here for the repair.

Battery installer near me: Tesla Powerwall, Enphase and FranklinWH installers

Tesla Certified Installer, Enphase Platinum or Gold Installer, and FranklinWH Certified Installer are the three credentials that matter, and each manufacturer publishes a locator. Certification affects warranty support and whether the manufacturer reimburses labor on a warranty claim. Ask which one the installer holds before you sign.

Battery storage tax credit in 2026 and other incentives

The 30% federal residential clean energy credit (Section 25D) ended for property placed in service after December 31, 2025 under the 2025 federal budget law, so a battery installed in 2026 does not qualify. State and utility programs continue and vary: California's SGIP, Massachusetts' ConnectedSolutions, and utility demand-response payments in Texas, Arizona and the Northeast. Check the program before signing; most require the installer to enroll the battery. A tax question goes to a tax professional.

Home and solar battery installation: what the job involves

1. A site check of the electrical panel, the inverter and where the battery can go (garage wall, side of the house or a utility room).
2. Permits: an electrical permit from the city, and an interconnection update with the utility, which has to approve the battery before it runs.
3. Install day: mounting the battery, the backup gateway or controller, and the wiring to the main panel or a backup subpanel.
4. Inspection and permission to operate, then commissioning and app setup.

AC-coupled batteries are the usual retrofit because they connect on the AC side of any existing array, whatever inverter it has. That is why a battery can go onto an orphaned system without the original installer.

Franklin whole home battery: the FranklinWH aPower 2

The FranklinWH aPower 2 is a 15 kWh battery with its own inverter, controlled by the aGate. EnergySage Marketplace quotes put a single installed aPower 2 at $17,655 before incentives, and FranklinWH warrants it for 15 years to at least 70% of its capacity. It is AC-coupled, so it fits any existing array, and it is sold as whole home backup when paired with enough capacity for the house's loads.

Tesla Powerwall repair and support

Powerwall faults go to Tesla first: the Tesla app's Support section, or (877) 798-3752, option 4 then option 2. If a company other than Tesla installed the Powerwall, the app shows that installer's contact; if that installer has closed, a Tesla Certified Installer can take over service.

Tesla Powerwall 3 on existing solar

Full prices, specs and installer questions are on the Tesla Powerwall cost page.

EnergySage Marketplace quotes in May 2026 put a Tesla Powerwall 3 at $13,473 installed before incentives, about $998 per kWh of storage. Angi's May 2026 range is $9,000 to $12,000. The Powerwall 3 has its own built-in solar inverter, so on an older system it can also replace a failing string inverter. Installation is done by Tesla or a Tesla Certified Installer, and the labor share of a retrofit runs $2,000 to $3,500 per Angi.

Enphase battery installation

Enphase batteries are AC-coupled and fit any existing array, and they suit Enphase microinverter systems best. An IQ Battery 10C runs about $13,000 installed per an installer quote cited by EnergySage, and two IQ Battery 5P units $15,000 to $17,000 per SolarReviews, before incentives. Backup needs Enphase's IQ System Controller. Look for an Enphase Gold or Platinum installer, since certification affects warranty labor support.

Battery prices and utility programs by city

City guides with local utility rules, permits and prices: Los Angeles, San Diego, Phoenix (APS Storage Rewards), Las Vegas, Denver (Xcel), San Antonio (CPS battery rewards), Orlando (Duke).