Battery Backup Systems for Homes and Businesses
Battery backup systems have moved from a niche purchase to a practical necessity across Houston and the rest of Texas. The U.S. Energy Information Administration reported that American households averaged 11 hours without power in 2024, nearly double the prior decade’s average of four hours. For Houston specifically, the stakes are higher. Hurricane Beryl knocked out power for 2.26 million CenterPoint customers in July 2024, and some neighborhoods waited more than eight days to get it back (Texas Tribune). This isn’t a worst-case scenario anymore. It’s the pattern.
This guide covers how battery backup systems work, why they’ve become critical for Texas properties, what they actually cost in 2026, and how to size one correctly for your home or business.
Key Takeaways
– Texas recorded 263 major outage events from 2019 to 2023, more than any other U.S. state, with an average duration of 160 minutes per event (Governing, citing DOE data).
– U.S. residential battery storage installations grew 92% in 2025 to 2,700 MW, a new annual record (Wood Mackenzie).
– In Texas, a 13.5 kWh home battery system costs an average of $17,472 installed, or about $1,344 per kWh (EnergySage).
– Battery backup works without solar. It charges from the grid and switches to stored power automatically during an outage.
What Is a Battery Backup System?
A battery backup system stores electricity and delivers it automatically when the grid goes down. There’s no startup delay, no engine noise, and no fuel to manage. The system monitors your grid connection around the clock. When it detects an outage, it switches to stored power in milliseconds, fast enough that most appliances don’t even register the gap.
Three core components make up most systems: a battery pack that stores energy (measured in kilowatt-hours), an inverter that converts stored DC electricity into usable AC power, and a control system that manages which circuits to prioritize and when. Larger commercial setups may include multiple battery modules and integrate with existing energy management software.
These systems charge in two ways. Paired with solar panels, they capture excess generation during the day and store it for later. Without solar, they charge directly from the grid, either overnight or during normal daily operation. Both configurations provide reliable outage protection. The solar pairing matters most during extended multi-day outages, where the ability to recharge each day makes a real difference.
Why Does Texas Have So Many Power Outages?
Texas leads the country in power outages by a wide margin. From 2019 to 2023, Texas recorded 263 major outage events, more than any other state, with each event lasting an average of 160 minutes and affecting roughly 172,000 customers (Governing, citing U.S. Department of Energy data). The state’s SAIDI score, a utility reliability metric measuring average outage minutes per customer per year, reached 273 minutes in 2022, more than double the national average of 126 minutes (EIA).
There are a few structural reasons this keeps happening.
The grid is isolated. ERCOT, which operates Texas’s main power grid, runs nearly independently from the national grid. That means Texas can’t draw power from neighboring states during emergencies the way most states can. When local supply falls short, there’s no backstop.
Extreme weather has two modes. Winter Storm Uri in February 2021 knocked out power to more than 4.5 million Texas homes and businesses, with some counties experiencing outages exceeding 72 continuous hours (PMC/NIH). Hurricane season brings a completely different threat: Beryl’s 2024 landfall in Houston was the largest outage event in CenterPoint’s history. Between those two failure modes, Houston property owners face risk in nearly every season.
Summer heat strains the system too. Record temperatures push electricity demand to extremes, and the grid often operates near capacity during heat waves. Local distribution equipment failures become more likely, and the grid has less margin to absorb them.
This isn’t a problem that infrastructure upgrades will solve quickly. Battery backup is the most practical near-term option for protecting individual properties.
Battery Backup for Homes
Home battery storage is growing faster than almost any other energy product in the U.S. Residential battery installations hit 2,700 MW in 2025, up 92% from 2024 and the highest annual total on record, according to Wood Mackenzie. In Texas, demand is especially strong because the outage risk is real and well understood by homeowners. We’ve installed systems across Houston neighborhoods including Katy, Sugar Land, The Heights, Pearland, and Clear Lake. The most common question we hear: “How much of my house can this power, and for how long?”
The answer depends on system size and what you’re trying to run.
Whole House Battery Backup
Whole-house backup means the system covers most or all of your home during an outage, not just a few essential circuits. For a typical Houston home running central air conditioning, a refrigerator, lighting, internet, and outlets, a 20 to 27 kWh system provides realistic whole-home coverage. A 13.5 kWh unit handles essential circuits well but may require cycling the HVAC to stretch through a longer outage.
Three factors determine the right size: your average daily energy use (visible on your CenterPoint or Reliant bill in kWh), how many hours of backup you need, and whether you’re adding solar to recharge during the day. A proper load assessment before installation is the only reliable way to size this correctly. Guessing tends to leave homeowners either undersized during the next storm or overspending on capacity they won’t actually use.
Does Battery Backup Work Without Solar?
It does, and it’s more common than most people assume. In a grid-only configuration, the battery charges from your utility connection during normal operation. When the grid fails, it automatically switches to stored power. No manual steps required. Solar can always be added later if you want recharge capability during extended outages, but it’s not a requirement to get started.
This makes battery backup accessible for urban Houston properties with limited roof space, homeowners who aren’t ready to commit to a full solar project, and anyone who simply wants reliable outage protection now. For more on how solar and storage work together, see our V2H and home battery guide.
Battery Backup for Businesses
Power reliability is even more critical for businesses than for homes, because every outage hour has a direct financial cost. Even a brief interruption can mean lost transactions, spoiled inventory, stalled operations, or data that doesn’t save correctly. We’ve seen small restaurants in Houston lose thousands of dollars in perishable inventory from a single storm, and that’s a recoverable situation. Medical offices, cold storage operators, and data-dependent businesses face steeper consequences from the same event.
Commercial battery backup systems scale differently than residential units. A small office or retail location might need 20 to 50 kWh to keep POS systems, lighting, internet, and security running through an outage. Restaurants with commercial refrigeration, manufacturers with sensitive equipment, or facilities with medical devices require a full load assessment before any sizing is meaningful.
There’s also a longer-term efficiency argument. Texas grid battery capacity on ERCOT grew 4,100% between September 2020 and September 2024, reaching 5,707 MW, partly because stored energy helps manage demand costs (Texas Comptroller). Some commercial operators in Texas recover a meaningful portion of their installation cost through demand charge management alone, independent of any outage event.
Battery Backup vs. Generator: Which Should You Choose?
Both provide backup power, but they work very differently, and the right choice depends on your situation. Here’s a direct comparison across the factors that matter most for Houston homeowners and businesses:
| Feature | Battery Backup | Generator |
|---|---|---|
| Activation time | Milliseconds (automatic) | 10-30 seconds (auto-start) or manual |
| Noise during operation | Silent | Loud, gas or diesel exhaust |
| Fuel required | None | Gas, diesel, or propane |
| Maintenance | Minimal (no moving parts) | Oil changes, filters, fuel rotation |
| Indoor installation | Yes | No (requires outdoor ventilation) |
| Emissions | Zero | Carbon monoxide risk |
| Upfront cost | Higher | Lower |
| Long-term running cost | Low (no fuel purchases) | Ongoing fuel and maintenance |
| Best for | Outages up to 24-48 hours, with recharge capability | Multi-day outages with reliable fuel access |
From what we’ve seen installing systems around the Houston metro, batteries tend to win for homeowners and small businesses that prioritize convenience, safety, and quiet operation. Generators still make practical sense where outages routinely stretch beyond several days and a reliable fuel supply, such as a large propane tank, is available. That describes some rural Texas properties better than it describes most Houston neighborhoods.
After Hurricane Beryl, we heard from many Houston homeowners that generator fuel was difficult to find after the second day. That’s a real operational risk that a battery system doesn’t have.
How Much Does Battery Backup Cost in Texas?
Real installed costs in Texas are available from marketplace data. The average installed price for a 13.5 kWh home battery system in Texas is $17,472 in 2026, with a typical range of $14,851 to $20,093, according to EnergySage’s Texas marketplace data. That works out to roughly $1,344 per kWh installed, slightly above the national average of $1,128/kWh due to Texas-specific permitting and labor costs.
A rough sizing framework for Houston homes:
- 10 kWh system: $13,000-$16,000 installed. Covers essential circuits (lights, internet, refrigerator, phone charging) through most overnight outages.
- 13.5 kWh system: $15,000-$20,000 installed. The most common residential configuration. Handles essential loads comfortably with managed HVAC use.
- 20-27 kWh system: $25,000-$38,000 installed. Whole-house coverage for larger homes or those who want extended runtime without managing loads.
- Multi-battery commercial systems: Ranges widely. A small business setup starts around $20,000-$40,000 for light commercial loads. Larger deployments require a site assessment before a meaningful cost estimate is possible.
What drives the price up or down? Energy capacity is the biggest factor. Beyond that: installation complexity (panel upgrades, conduit runs, permitting), whether solar is included, and the specific battery brand and product line. For a full breakdown of what goes into these numbers, see our complete guide to home battery backup costs in 2026.
How to Choose the Right Battery Backup System for Your Property
The right system starts with your priorities, not with product specifications. A Houston homeowner who wants to run the air conditioner and keep food from spoiling through a two-day storm needs a completely different system than a medical office protecting sensitive diagnostic equipment.
Here are the questions worth answering before you talk to any installer:
What do you actually need to power? List your critical circuits: HVAC, refrigerator, medical devices, internet router, lighting, security system, key outlets. Add up wattage to get a load estimate.
How long do you need backup power? One night requires far less capacity than a week-long recovery. If you’re adding solar for daytime recharge, the math changes considerably, since a smaller battery can cover more time when it refills each day.
Where will the system be installed? Battery systems require indoor or protected installation. Most residential units take up wall space comparable to a large electrical panel. Commercial systems may need a dedicated equipment room or outdoor enclosure.
What’s your budget? Understanding whether you need essential-circuit coverage or whole-house backup before comparing products prevents both undersizing and overspending.
We start most consultations with a load assessment: reviewing your utility bills, identifying critical loads, and sizing the system to your actual usage and backup goals. That step turns a general idea into a plan with real numbers.
If you’re weighing battery backup against vehicle-to-home (V2H) technology as an alternative, see our V2H vs. Powerwall comparison for a side-by-side breakdown.
Frequently Asked Questions
How long can a battery backup system power a Houston home?
It depends on system size and what you’re running. A 13.5 kWh battery covering only essential loads (refrigerator, internet, lights, and phone charging) can last 24 to 36 hours. Running central air conditioning shortens that window significantly. A 20 to 27 kWh system paired with solar for daytime recharge can extend protection through multi-day outages like Houston experienced during Hurricane Beryl.
Can a battery backup system power an entire house?
Yes. Whole-house battery backup is a real configuration, not just a marketing claim. It requires accurate sizing based on your actual energy consumption. Most Houston homes need 20 kWh or more for full coverage without load management. Oversizing rarely causes problems; undersizing means the system may not cover everything you expected during an extended outage.
Is battery backup better than a generator for Houston?
For most Houston households, yes. Battery systems activate in milliseconds, operate silently, require no fuel management, and install indoors. The main advantage generators retain is extended runtime during very long outages where fuel supply is reliable. After Beryl, many Houston homeowners we spoke with found that generator fuel was hard to locate after the first two days, which is a real operational problem that batteries don’t have.
Do you need solar for battery backup to work?
No. Battery backup works without solar. The battery charges from your regular grid connection and automatically switches to stored power during an outage. Solar is an optional addition that allows the battery to recharge during daylight hours, which matters most during outages that last several days. If you plan to add solar later, a properly sized battery installation today can be designed to accommodate that addition without replacing major components.