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Battery

Home Battery Storage: Costs, Sizing & Backup Power

A home battery stores electricity for later use — charged from the grid, solar, or both — and can back up part or all of a home during an outage, or lower a bill by charging when rates are low and discharging when rates are high. Installed systems in Texas typically range from roughly $9,000 to $20,000+, depending on usable capacity and installation complexity.

AI Energy Plans · Published August 15, 2026 · Reviewed for accuracy

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Key Takeaways

  • A home battery can operate with or without solar — it stores electricity from whatever source is available, then discharges it later.
  • Installed costs in Texas commonly range from about $9,000 to $20,000+ depending on usable capacity and equipment.
  • Sizing depends on the goal: partial backup, whole-home backup, or energy arbitrage each call for a different capacity.
  • The Section 25D federal tax credit for battery storage ended for systems placed in service after December 31, 2025.
  • Texas has no statewide net metering mandate — buyback terms for any exported solar or battery-discharged power vary by REP and TDU.

What Is Home Battery Storage?

A home battery is a rechargeable energy storage system, typically lithium-ion, installed alongside a home's electrical panel. It can charge from the electric grid, from rooftop solar panels, or both, and discharge that stored electricity later — either to reduce reliance on grid power during expensive hours or to keep circuits running during a power outage.

Home batteries are sized in two figures that matter for different reasons: total and usable kWh capacity (how much energy it can store) and kW power rating (how much load it can serve at once, and whether it can start large appliances like an air conditioner compressor). Both figures affect what a battery can realistically do for a given household.

How Much Does a Home Battery Cost in Texas?

Installed home battery systems in Texas commonly range from roughly $9,000 to $20,000 or more before incentives, depending on usable capacity, the brand and chemistry of the battery, inverter requirements, and installation complexity such as panel upgrades or permitting. Systems sized for whole-home backup sit at the higher end of that range; systems sized for partial backup or arbitrage-only use are typically less expensive.

Essentials backup

Basic Resilience
Typical Usable Capacity

5–10 kWh

What It Generally Covers

Refrigerator, lighting, internet/router, some outlets, for several hours

Partial-home backup

Extended Coverage
Typical Usable Capacity

10–20 kWh

What It Generally Covers

Essentials plus select circuits (well pump, some HVAC) for a longer stretch

Whole-home backup

Maximum Coverage
Typical Usable Capacity

20–40 kWh+

What It Generally Covers

Most or all circuits, including HVAC, for an extended outage

Arbitrage-focused (no backup priority)

Bill Optimization
Typical Usable Capacity

10–15 kWh

What It Generally Covers

Sized around daily on-peak usage rather than outage duration

On pricing: These are general ranges observed across the Texas market, not a quote. Actual installed cost depends on the specific equipment, site conditions, and installer. Get itemized quotes before comparing options, and see our methodology for how we model cost and payback estimates.

How to Size a Home Battery for Your Household

Sizing a battery starts with defining the goal — backup power, bill savings through arbitrage, solar self-consumption, or some combination — because each goal points to a different capacity. Backup sizing is driven by which circuits need to stay on and for how long; arbitrage sizing is driven by how much on-peak usage a household typically has in a day.
1

Define the goal

Decide whether the priority is outage protection, lowering the bill through TOU/arbitrage, maximizing solar self-consumption, or a mix of these. The right size is different for each.

2

Identify must-run loads (for backup)

List the circuits that must stay powered during an outage and estimate their combined wattage and hours of use per day.

3

Review actual hourly usage (for arbitrage)

For bill-savings goals, the relevant number is on-peak kWh consumed per day, not total daily usage — a battery only needs to cover the on-peak window it's designed to offset.

4

Account for round-trip efficiency and degradation

A battery doesn't return 100% of the energy put into it, and usable capacity declines gradually over its life. Sizing with some margin avoids underperforming in year 3 or 5.

Backup Power: What a Battery Can and Can't Keep Running

A correctly sized battery can keep essential circuits — refrigeration, lighting, internet, and some outlets — running for hours to a full day during an outage. Keeping high-draw loads like central air conditioning or an electric water heater running for an extended outage generally requires a larger, more expensive system, and even then, duration is limited by usable capacity.

Backup capability is not all-or-nothing. Many installations use a subpanel that routes only selected circuits to battery power, which keeps system cost down while still protecting what matters most to a household during an outage.

Battery Storage Without Solar

A home battery does not require solar panels to provide value. Charged directly from the grid during low-cost off-peak hours and discharged during high-cost on-peak hours, a battery can lower a bill through a strategy called energy arbitrage, entirely independent of any solar generation.

This approach pairs naturally with a Time-of-Use electricity plan, since the value of arbitrage depends directly on the spread between off-peak and on-peak rates. For a full breakdown of how this works, see Battery Energy Arbitrage.

“A battery's value isn't fixed — it's a function of three things a household controls or can choose: the electricity plan it's paired with, how it's dispatched, and how well its size matches actual usage.”

Federal & State Incentives

The Section 25D federal residential clean energy tax credit, which previously covered qualifying battery storage installations, terminated for systems placed in service after December 31, 2025. Texas also has no statewide net metering mandate, meaning any compensation for power a battery-and-solar system exports to the grid depends on the specific retail electricity provider and TDU, not a uniform state policy.

Compliance note: Incentive rules change. Confirm current federal, state, and utility-level incentives with the IRS, a licensed tax professional, or the relevant utility before making a purchasing decision based on any credit or rebate.

Frequently Asked Questions

Related Pages

Battery Energy Arbitrage

Grid charging and TOU discharge strategy explained.

Time-of-Use Electricity Plans

The rate structures that make arbitrage valuable.

Solar + Battery Storage

Combining generation and storage.

Electricity Plans

Compare all Texas electricity plan types.

Methodology

How we model cost, sizing, and payback.

Glossary

Round-trip efficiency, battery dispatch and more.

AI Energy Plans is a residential energy optimization platform operated by pchomes, inc.

We help homeowners compare electricity plans, model battery and solar savings, and evaluate home energy strategies.

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