Is a solar battery worth it?

A battery is worth buying when you can name the job: keep specific loads online in an outage, or move energy into higher-value hours under your real tariff and any verified incentive. If none of those apply, treat storage as optional comfort, not automatic savings.

Three questions before you add storage

1) Outage need: which circuits, for how long, and can the system recharge from solar while the grid is down? 2) Tariff: what is the import price when you would discharge versus the export value you give up to charge? Equal flat rates plus round-trip losses can erase shift value. 3) Incentive: is there a reserved utility or state storage program for your address, or only a brochure?

Hypothetical illustration only: delivering 8 kWh after 90% round-trip efficiency needs about 8.9 kWh charged. If that avoids $0.28/kWh imports and forgoes $0.06/kWh exports, gross energy value is roughly $2.24 minus $0.53, about $1.71 for that cycle — before equipment cost, degradation or reserve limits. Replace the sample rates with your tariff.

IRS says the residential clean energy credit is unavailable for property placed in service after December 31, 2025. Do not automatically subtract 30% from a 2026 battery quote. Installed price marketing ranges vary widely; require an itemized scope.

Before you decide

• Write the backup load list and target hours.
• Get import and export prices for the hours you would charge and discharge.
• Ask for solar-only and solar-plus-storage cash prices on the same array.
• Verify any storage incentive reservation in writing before relying on it.

Sources

• DOE: Solar Energy and Storage Basics
• IRS: Residential Clean Energy Credit

Source review: 2026-09-21. Links support the planning points above; they are not a quote, tariff approval or savings guarantee.