Buying a House That Already Has Battery Backup: What to Check First
The battery bolted to the garage wall is a fixture. It conveys with the house, and so does everything attached to it: a warranty that may or may not have years left, a lien that may or may not be filed, a permit record that may or may not exist, and the question of who answers the phone when it faults.
Most buyers treat it as a free bonus. Buying a house with battery backup means inheriting an asset or a liability, and five things decide which, all of them on a short clock. This checklist runs in order of turnaround, so nothing you request on Friday lands after your option period closes.
Key Takeaways
- A permanently installed battery is a fixture. It conveys unless the contract says otherwise, so you inherit its condition, its debt, and its history.
- The Texas option period is your only no-questions-asked window to investigate. Start on day one.
- Five items decide asset or liability: remaining warranty, filed liens or leases, permit records, a transferable monitoring account, and local service.
- The monitoring handover is the step buyers miss most, and the one that strands them after closing.
Does a home battery convey with the house in Texas?
Yes. A hardwired, permanently installed battery is a fixture, and fixtures convey unless the contract excludes them. The exception is a fixture lease. The Texas Real Estate Commission promulgates the Addendum Regarding Fixture Leases, form 52-1, for properties subject to one, and solar equipment is the textbook example (TREC, retrieved 2026-08-26).
That addendum obliges the seller to deliver lease copies on time, or the buyer may terminate. No addendum plus a silent disclosure notice is not proof the equipment is debt-free. Ask in writing.
Owned, financed, or leased changes what passes to you, and our post on
breaks that down tier by tier.Start the clock: what the option period is actually for
Under the TREC One to Four Family Residential Contract, an option fee buys the right to terminate for any reason, and that right ends at 5 p.m. local time on the last day (TREC, retrieved 2026-08-26). The fee must be paid within three days of the effective date or the right never existed.
So sequence the checks by turnaround. Records requests go first, because other people control how fast they come back.
| Day | Task | Who responds |
|---|---|---|
| 1 | Request permit records, the warranty transfer form, the monitoring login and the installer name | City, manufacturer, seller |
| 2 to 3 | Title officer checks the commitment for fixture filings | Title company |
| 3 to 4 | Call a local installer who services the brand | Installer |
| 4 to 5 | Walk-around during the general inspection | You |
Read the nameplate: what are you actually inheriting?
Every listed storage unit carries a nameplate with manufacturer, model, serial number, energy rating, and listing marks. Photograph all of them, including the inverter or controller, usually a separate box from the battery modules. The permit sticker and inspection tag sit near the disconnect.
Four things on that label matter. Manufacturer and model tell you who can service it. The serial number is what the manufacturer needs for a transfer. The manufacture date code starts the calendar warranty clock, which often runs earlier than the install date. The listing mark should show evaluation to UL 9540, since energy storage falls under Article 706 of the National Electrical Code and NFPA 855 (NFPA, retrieved 2026-08-26). Unlisted equipment is a stop sign.
Nameplate kWh is nominal, not usable. Our modules are rated 9 kWh nominal and 8.76 kWh usable, and a gap in that range is normal.
How much warranty is actually left?
Home battery warranties run on two clocks: a calendar term and a throughput or cycle limit. Whichever expires first ends coverage, and you inherit the remainder of both.
Ask the seller for the warranty certificate and commissioning date, then verify both with the manufacturer using the serial numbers. Sellers guess. Manufacturers know. Transfer is usually a form, sometimes a fee, and often carries a deadline measured from closing, which is why it is a day-one item. Once a claim is open, the order of calls matters, and our
covers it.A system four years into a ten-year term with no cycle history is worth materially less than a two-year-old one with clean logs. That is fair to raise in an option-period amendment.
Is there a lien, loan, or fixture lease filed against the system?
Financed storage equipment commonly carries a UCC-1 financing statement, often filed as a fixture filing, which lands in county real property records, with the Texas Secretary of State, or both (Texas Secretary of State, retrieved 2026-08-26). Your title company should surface it, but not every vendor files one. A clean title search is not proof the equipment is paid off.
Check four places:
- The title commitment, Schedule B, asking your title officer about fixture filings.
- Harris County Clerk real property records (Harris County Clerk, retrieved 2026-08-26).
- Texas Secretary of State UCC filings.
- The seller, in writing: is there any outstanding balance on this equipment?
It resolves three ways, all before funding: the seller pays it off and files a termination, you assume the loan with the lender's written consent, or the deal ends. Whether the seller can simply take the battery instead is answered in our post on
.Pull the permit and inspection records yourself
A permitted install leaves a paper trail you can pull without the seller. Inside city limits, the City of Houston permit portal searches by address (City of Houston, retrieved 2026-08-26). Outside them, the record sits with the county or municipality.
You want three things: an electrical permit covering the storage install, a passing final inspection, and a licensed contractor named on the record. Verify that contractor at the Texas Department of Licensing and Regulation, whose license search is free and public, and confirm the license reads Active (TDLR, retrieved 2026-08-26).
No permit? Not automatically a deal killer, but nobody inspected the work, an insurer has an opening if you claim, and legalizing it after closing is your cost. What a fresh permit involves is in our
.The step buyers miss: the monitoring account handover
This is the one that strands people. Nearly every modern system reports through an app tied to the original owner's email, and the installer portal still lists the original installer. Reassign neither and you own the hardware with none of the access.
From our takeover visits: buyers discover this months later, the first time a technician asks for a fault log and nobody can pull one. Without the account you also lose live state of charge, the firmware update path, and remote diagnostics.
Ask for four things during the option period, in writing:
- The monitoring login, the account email, and written agreement to release it.
- The system serial numbers, from your nameplate photos.
- The original installer's name and the commissioning report.
- A change-of-ownership request opened with the manufacturer before closing.
Do it while the seller still needs something from you. Our guide to
shows what a working setup looks like once it is yours.Orphaned brands, and who services them in Houston
A warranty is only worth the company standing behind it and the local crew willing to touch the equipment. Houston-headquartered Sunnova Energy International filed for Chapter 11 in June 2025 in the Southern District of Texas and cut roughly 55% of its workforce (Utility Dive, retrieved 2026-08-26). Its legacy fleet later moved to a third-party servicer (Solar Power World, retrieved 2026-08-26).
The hardware keeps running and the contract still binds, but the servicer of record, the monitoring path, and the warranty channel may all have changed hands. Nobody tells the new homeowner.
One call resolves it. Before the option period ends, ask a local installer who works on that brand two questions: will you take this over, and can you get parts. A no to either is a negotiation item. Our roundup of
helps identify what you have.The ten-minute physical walk-around
Bring a flashlight to the general inspection and check six things.
- Enclosure corrosion. Rust streaks, pitting, or chalking at seams and fastener heads. A NEMA Type 3R enclosure sheds rain and sleet but is not corrosion-rated; Type 4X adds corrosion protection and salt-spray testing (NEMA, retrieved 2026-08-26).
- Siting and clearances. Anything crammed into a closet or boxed in by storage.
- Water line. In flood-prone areas, check mounting height against past water lines and staining on the wall behind the unit.
- Conduit and terminations. Loose straps, unsupported runs, crushed conduit, missing covers, exposed conductors.
- Labels and disconnects. Placarding at the service panel, a legible and reachable disconnect.
- Vents, fans, and noise. Debris, mud dauber nests, blocked airflow, fan roar, or a hot enclosure at low load.
Your general inspector is not a storage specialist. Past the obvious, bring a licensed electrical contractor who works on batteries. Once the system is yours, the
takes over.How to value a system that is already several years in
Value what is left, not what it cost: remaining calendar warranty, remaining throughput, capacity against your real loads, and whether a local company will service it.
| Verdict | What it looks like |
|---|---|
| Asset | Clean title, transferable warranty with years left, permitted and inspected, manufacturer still trading, a local installer who will take it on |
| Neutral | Works fine, small, no expansion path, thin local service. An appliance, not a backup plan |
| Liability | Unpermitted, orphaned brand, no monitoring access, or an unresolved fixture filing. Negotiate or walk |
An undersized inherited system is the most common outcome. One module runs a fridge and lights, not central air on a Houston August evening, and the first outage is an expensive place to learn that.
The short version
Order your checks by turnaround and start on day one. Four of the five decisive items depend on someone else answering you, which is why day five is too late to begin.
Most inherited systems are worth having. A few are worth walking away from. The only way to know which is to check while you can still change your mind.
Or call Eos at 833-989-3737 to talk through your setup with an installer.
Frequently Asked Questions
Does a home battery convey with the house in Texas?
Yes, if it is permanently installed and not subject to a fixture lease. TREC promulgates form 52-1 for such properties, and it requires the seller to deliver lease copies to the buyer (TREC).
How do I find out if there is a lien on the battery?
Ask your title officer to check the commitment for fixture filings, then search Harris County Clerk records and Texas Secretary of State UCC filings (Texas Secretary of State). Not every lender files one, so ask the seller too.
Can the battery warranty be transferred to me?
Usually yes, by form and sometimes for a fee, but the window is often measured from the closing date. Contact the manufacturer with the serial numbers during the option period, because a missed deadline can end the remaining coverage.
What if the installer or the manufacturer went out of business?
The hardware keeps working, but service and warranty move to whoever holds the book. Sunnova's legacy fleet transferred to a third-party servicer after its 2025 Chapter 11 filing (Solar Power World). Call a local installer and confirm they will take it over.
Should my home inspector check the battery?
A general inspector will note the obvious: corrosion, blocked vents, sloppy conduit, a missing disconnect label. For anything past that, bring a licensed electrical contractor who works on storage, and verify the license at the Texas Department of Licensing and Regulation (TDLR).