# Home Battery Installer Red Flags: How to Vet a Contractor

How to check a home battery installer's license and certification, spot a padded deposit, and use your federal cancellation right before you sign.

- Canonical: [https://homebattery.guide/guides/home-battery-installer-red-flags](https://homebattery.guide/guides/home-battery-installer-red-flags)
- Markdown: [https://homebattery.guide/guides/home-battery-installer-red-flags.md](https://homebattery.guide/guides/home-battery-installer-red-flags.md)
- Published: 2026-08-19
- Updated: 2026-08-19
- Author: Marcus Reed

## Quick answer

Before you sign a home battery contract, check three things independently of what the salesperson tells you. Verify the installer's license yourself: California's CSLB lookup for a C-10 electrical contractor, Texas's TDLR search for an electrician and electrical contractor license. Check the deposit against the law where you live: California caps a home improvement down payment at $1,000 or 10 percent of the contract, whichever is less. And know your federal cancellation right: the FTC's Cooling-Off Rule gives you three business days to cancel any in-home sale over $25, no reason required. Add brand certification, which decides whether your warranty survives an uncertified install, and you have the four checks that catch most installer problems before they cost you money.

Before you sign a home battery contract, check three things independently of what the salesperson tells you. Verify the installer's license yourself: California's CSLB lookup for a C-10 electrical contractor, Texas's TDLR search for an electrician and electrical contractor license. Check the deposit against the law where you live: California caps a home improvement down payment at $1,000 or 10 percent of the contract, whichever is less. And know your federal cancellation right: the FTC's Cooling-Off Rule gives you three business days to cancel any in-home sale over $25, no reason required. Add brand certification, which decides whether your warranty survives an uncertified install, and you have the four checks that catch most installer problems before they cost you money.

None of this is exotic. It is public, free, and takes fifteen minutes. Most buyers skip it because the salesperson is standing in the kitchen and the checks feel rude to run in front of them. Run them anyway, before you sign, not after.

## Home battery installer red flags

| Red flag | What it sounds like in the pitch | The question to ask back | Walk-away threshold |
| --- | --- | --- | --- |
| Unverifiable license | "We're fully licensed and insured" with no number offered | "What's your CSLB or TDLR license number? I'll look it up while you're here." | Refuses to give a number, or the number does not match the business name |
| Installer, not brand, is uncertified | "We install Tesla, Enphase, everything" | "Are you a certified installer for this specific brand, and can I see the certification?" | Cannot produce brand-specific certification for the system being quoted |
| Deposit above the legal cap | "We need 30 percent down to order the equipment" | "What does state law cap a home improvement deposit at?" | Deposit exceeds your state's legal maximum (California: $1,000 or 10 percent, whichever is less) |
| No written cancellation notice | Verbal reassurance, no cancellation form in the paperwork | "Where is my three-day right to cancel in this contract?" | Contract does not include a cancellation notice and two copies of a cancellation form |
| Permit in your name | "You'll pull the permit, it's simpler that way" | "Why isn't this permit going through your contractor license?" | Contractor asks you, not them, to be the permit holder of record |
| Same-day discount pressure | "This price is only good if you sign tonight" | "Can I have this exact quote in writing, valid for two weeks?" | Refuses to honor the price beyond the same visit |
| Stale federal tax credit in the math | "You'll get 30 percent back from the federal credit" | "What is the effective date of that credit, and where is it in writing?" | Credit is dated after December 31, 2025 with no correction once you raise it |
| No workmanship warranty term stated | Warranty talk stops at the manufacturer's years | "What is your own workmanship warranty, in years, in writing?" | No installer workmanship warranty offered separately from the manufacturer's |
| Registration is "handled automatically" | "Don't worry about registering it, we take care of that" | "Can I see the registration confirmation once it's done?" | Cannot produce registration confirmation after install, where the brand requires it |
| Vague on who answers a warranty claim | "Just call us if anything goes wrong" | "If you close down, who do I call for a manufacturer warranty claim?" | Cannot name the manufacturer's own support channel, only their own phone number |
| No commissioning report | Install day ends with no formal handoff document | "What commissioning documentation do I get at the end?" | No commissioning report, no as-built documentation, no photos of the completed work |
| Bundles battery and financing into one number | Only a monthly payment is shown, never a cash price | "What is the cash price, separate from any financing?" | Refuses to itemize a cash price in writing |

## Verify the license yourself, before the sales call ends

A license number offered verbally means nothing until you check it against the state's own database. Both major lookup tools are free, public, and require no account.

**California: check the CSLB license.** The Contractors State License Board's [Check A License tool](https://www.cslb.ca.gov/onlineservices/checklicenseII/checklicense.aspx) lets you search by license number, business name, or personnel name. A home battery installer doing electrical work needs a C-10 electrical contractor classification. Confirm the license is active, matches the business name on your contract, and carries no unresolved complaint or disciplinary history before you sign anything.

**Texas: check the TDLR license.** The Texas Department of Licensing and Regulation runs a [License Search](https://www.tdlr.texas.gov/LicenseSearch/) that covers electricians and electrical contractors, no account required. Texas electrical work requires two separate credentials: a company Electrical Contractor license and an individual Master Electrician license held by the person supervising the job. Ask for both, and check both, not just the one on the truck door.

**Whoever pulls the permit should be the licensed contractor, not you.** A legitimate installer pulls the electrical permit under their own contractor license, which is also what keeps them liable for the work if an inspection fails. An installer who asks the homeowner to pull the permit is shifting that liability onto you, and it is a commonly cited sign that the installer may not be properly licensed, insured, or a registered business in your state at all. If a proposal is silent on who pulls the permit, ask before you sign, not after the trench is already dug.

**NABCEP certification is the cross-brand credential to ask about.** The North American Board of Certified Energy Practitioners' [Energy Storage Installation Professional (ESIP)](https://www.nabcep.org/certifications/energy-storage-installation-professional-esip/) credential requires OSHA 30 safety training, 58 hours of storage-specific instruction, and documented experience on real battery projects, on top of whatever state contractor license the installer already holds. It is not required to install a battery legally, but it is a real signal of storage-specific competence beyond a general electrical license, and asking about it is a fair question for any installer quoting a battery system.

## Brand certification decides your warranty, not just your install quality

This is the part most buyers miss: several manufacturers only honor the full warranty if a certified installer does the work, and some cut coverage sharply if the system is never registered. The full cross-brand comparison, including cycle caps and capacity retention, lives in the [warranty guide](/guides/home-battery-warranty-guide). Here is the certification consequence by itself.

| Brand | Certification requirement | What happens if you skip it |
| --- | --- | --- |
| Tesla Powerwall 3 | Warranty claims route through Tesla and its certified installer network; system must stay internet-connected for firmware updates | Losing connectivity can affect coverage; an uncertified install complicates a warranty claim |
| Enphase IQ Battery 5P | Claims flow through Enphase-certified installers | An uncertified install is harder to get warrantied without the certified paper trail |
| FranklinWH aPower 2 | Registration required at installation | Unregistered systems drop from 15 years of coverage to 4 |
| Generac PWRcell 2 | Registration plus continuous internet connectivity required; only Generac-certified technicians perform covered repairs | Skipping registration or connectivity can cut module coverage from 10 years to 5 |
| sonnenCore+ | Requires a sonnen-certified installer plus product registration | Warranty validity itself depends on both conditions being met |

Ask your installer to show you, not tell you, that they are certified for the specific system in your proposal, and get the registration confirmation in writing once install day is done. If the installer cannot produce either, treat the manufacturer's published warranty as aspirational rather than guaranteed.

## What a normal deposit looks like, and where the law caps it

Deposit norms vary by state, and this guide can only confirm the two markets where the law is dated and public. **California caps a home improvement deposit at $1,000 or 10 percent of the contract price, whichever is less**, under Business and Professions Code Section 7159.5. The contract itself is required to disclose this cap in boldface. A California proposal asking for anything above that, under any label, whether it is called a deposit, a material fee, or a mobilization charge, is asking for more than state law allows.

Outside California, ask your installer to name the specific state law or licensing-board rule that governs deposits in your state, in writing, rather than accepting "that's normal" as an answer. A normal payment schedule for the rest of the contract is staged against milestones, typically a portion at signing, a portion at rough-in or delivery of equipment, and a final payment at commissioning and inspection sign-off, not one large payment collected before any work has started.

## Your federal right to cancel

If a salesperson pitched you the battery in your home, you likely have a federal right to walk away for a full refund, no reason required. The FTC's [Cooling-Off Rule](https://www.ftc.gov/legal-library/browse/rules/cooling-period-sales-made-home-or-other-locations), codified at 16 CFR Part 429, gives buyers three business days to cancel a sale of $25 or more made anywhere other than the seller's normal place of business, which covers a presentation made at your kitchen table. The salesperson is required to tell you about this right at the time of sale, and the contract must include two copies of a cancellation form, one to keep and one to mail back, postmarked before midnight of the third business day. If your contract does not include a cancellation notice, that omission is itself worth raising before you sign, and worth a call to your state attorney general's consumer protection office if the installer refuses to correct it.

The rule does not apply to a sale made entirely online, by mail, or by phone with no in-person visit, so an installer who closes the deal remotely after an earlier in-home visit is a scenario worth asking your own state consumer-protection office about directly.

## Workmanship warranty versus manufacturer warranty

Two separate warranties cover a battery install, and they do not survive the same way. The manufacturer's product warranty covers the hardware and is documented brand by brand in the [warranty guide](/guides/home-battery-warranty-guide), including what happens if the manufacturer or installer goes out of business. The installer's own workmanship warranty, covering their labor and wiring, is a separate promise with no industry-standard length: terms commonly run 5 to 10 years but vary far more than manufacturer coverage, since there is no consensus length the way there is for a battery's own warranty. Get the workmanship term in writing, in years, as its own line in the contract, not folded into a sentence about the manufacturer's coverage.

## Watch the financing and the incentive math too

A licensed, certified installer can still hand you a padded quote. The [financing guide](/guides/home-battery-financing-loan-vs-lease) covers the loan dealer fee that the CFPB found hidden in many solar and battery loans, and the [how to read a battery quote](/guides/how-to-read-a-battery-quote) checklist covers hardware, gateway, and panel line items. Layer this guide's installer checks on top of both, since a licensed installer with a fair price can still be the wrong choice if the deposit, cancellation notice, or certification paperwork is missing.

One dated fact worth restating here because it still shows up in live quotes: the federal Section 25D residential credit is not available for property placed in service after December 31, 2025. A 2026 proposal that still prices in a 30 percent federal credit for a cash or loan purchase is working from a dead number, regardless of how licensed or certified the installer otherwise is.

## Quote red flags

- The installer will not provide a license number, or the number does not match the business name on the contract.
- No brand-specific installer certification for the exact system being quoted.
- A deposit above your state's legal cap, or above $1,000/10 percent in California specifically.
- No cancellation form or notice of your three-day federal right to cancel.
- You, not the contractor, are asked to be the permit holder of record.
- No workmanship warranty term stated separately from the manufacturer's warranty.
- No commissioning report or as-built documentation promised at project close.

## What to ask before signing

1. What is your license number, and can I look it up with you right now?
2. Are you certified by the manufacturer for this specific system, and can you show me the certification?
3. What is the deposit, and does it comply with my state's legal cap?
4. Where is my three-day right to cancel in this contract, in writing?
5. Who pulls the electrical permit, under whose license?
6. What is your workmanship warranty term, separate from the manufacturer's warranty?
7. Will the system be registered, and can I see confirmation once it happens?

Holding a proposal already? Send it through a free [quote review](/quote-review) or run it against the [quote calculator](/tools/battery-quote-calculator). We do not sell batteries and we do not auction contact details to installers, so the read comes back straight.

## Commercial note

Home Battery Guide may earn from affiliate links or flat-fee referrals to named vetted installers. Rankings do not move with compensation. We do not sell the same lead to multiple installers, and a referred installer quote still has to pass the same quote check, including the license and certification checks on this page.

## Frequently Asked Questions

### How do I check if a home battery installer is licensed?

In California, use the CSLB's free [Check A License tool](https://www.cslb.ca.gov/onlineservices/checklicenseII/checklicense.aspx) and confirm a C-10 electrical classification. In Texas, use the [TDLR License Search](https://www.tdlr.texas.gov/LicenseSearch/) and check both the company's Electrical Contractor license and the individual Master Electrician license of the person supervising the job. Every state has its own contractor licensing board; ask your installer to name theirs and verify it yourself rather than taking their word for it.

### What is a normal deposit for a home battery installation?

It depends on your state's law. California caps a home improvement deposit at $1,000 or 10 percent of the contract price, whichever is less, under Business and Professions Code Section 7159.5, and the contract must disclose that cap in boldface. Outside California, ask your installer to name the specific rule that applies where you live rather than accepting a round number as normal.

### Can I cancel a home battery contract after I sign it?

Often yes, if a salesperson pitched you in your home. The FTC's Cooling-Off Rule gives buyers three business days to cancel an in-home sale of $25 or more, for any reason, and the seller is required to provide a cancellation form and notice of that right at the time of sale. The rule does not cover a purchase made entirely online, by mail, or by phone with no in-person visit.

### Does it matter if my installer isn't certified by the brand?

Yes, for the warranty. Enphase and Tesla route warranty claims through their certified installer networks, FranklinWH drops an unregistered system's coverage from 15 years to 4, Generac requires registration and connectivity or coverage can fall to 5 years, and sonnen requires both a certified installer and registration for the warranty to be valid at all. An uncertified installer can still do good electrical work, but the manufacturer's warranty is a separate promise that depends on the certification and registration paperwork existing.

### Who is supposed to pull the electrical permit, me or the contractor?

The contractor, under their own license. That is what keeps them liable if the work fails inspection. A request for you to pull the permit yourself shifts that liability onto you and is a commonly cited sign that the installer may have a licensing, insurance, or registration problem worth investigating before you sign anything.

## Sources

- [FTC: Cooling-off Period for Sales Made at Home or Other Locations (16 CFR Part 429)](https://www.ftc.gov/legal-library/browse/rules/cooling-period-sales-made-home-or-other-locations)
- [Cornell Law School Legal Information Institute: Cooling-off rule](https://www.law.cornell.edu/wex/cooling-off_rule)
- [California Legislative Information: Business and Professions Code Section 7159.5](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=7159.5.&lawCode=BPC)
- [CSLB: Check A License tool](https://www.cslb.ca.gov/onlineservices/checklicenseII/checklicense.aspx)
- [CSLB: C-10 Electrical licensing classification](https://www.cslb.ca.gov/about_us/library/licensing_classifications/Licensing_Classifications_Detail.aspx?Class=C10)
- [Texas Department of Licensing and Regulation: License Search](https://www.tdlr.texas.gov/LicenseSearch/)
- [NABCEP: Energy Storage Installation Professional (ESIP) certification](https://www.nabcep.org/certifications/energy-storage-installation-professional-esip/)
- [EnergySage: Solar panel warranties explained](https://www.energysage.com/solar/solar-panel-warranties/)
- [Angi: Who pulls permits, homeowner or contractor?](https://www.angi.com/articles/who-pays-building-permits.htm)
- [IRS: Residential Clean Energy Credit](https://www.irs.gov/credits-deductions/residential-clean-energy-credit)