A customer with panels going up Thursday is about to read that the government banned her inverter. The ban is real. It is aimed at models that do not exist yet — and the FCC wrote that down.

The call is coming. Somebody two weeks from installation reads a headline that says foreign-made inverters are now on a federal national-security ban list, and since nearly every spec sheet you hand out has an overseas factory behind it somewhere, she wants to know if her system is illegal, unsafe, or both.

Here is what actually happened, off the FCC’s own fact sheet, so you can answer her in one breath and be right.

On July 28 the FCC added “connected power inverters produced in foreign countries” to its Covered List — the register of communications equipment deemed a national-security risk. The FCC didn’t decide this on its own; under the Secure and Trusted Communications Networks Act it can only update the list when national security agencies direct it to, and a White House-convened interagency body determined these devices “pose unacceptable risks to the national security of the United States or the safety and security of United States persons.”

The mechanism matters more than the adjective. Most electronics need an FCC equipment authorization before they can be imported, marketed, or sold in the U.S. Covered equipment can’t get NEW authorizations. That is the entire ban. Now read the four words the headlines will skip.

What a NEW foreign inverter model can no longer be in the U.S. without an exemption — because it can no longer get the FCC equipment authorization those three things require.

Every model already authorized keeps its authorization. The system on your customer’s roof, the units in your warehouse, the model number on the quote she signed — all of it sits on existing authorizations, and the FCC says so in plain sentences.

So where does this actually bite? Next year’s catalog. Inverter makers refresh models constantly — new firmware platforms, new sizes, new hybrid units — and every refresh that counts as a new device model now needs to clear a wall that wasn’t there last week.

There is one door through it: the determination lets the Department of Homeland Security grant “Conditional Approval” to inverter producers whose devices are found not to pose the risk, and the FCC is telling producers to apply at conditional-approvals@fcc.gov. Nobody knows yet how fast that queue moves, because as of this week it has never moved.

Notice what the FCC did not publish: a list of brands. “Foreign-produced” is the whole category, “regardless of the nationality of origin.” This is not a China rule wearing a costume — on its face it reaches an inverter built anywhere that isn’t here.

Kept honest. What nobody knows yet: how “new device model” will be drawn in edge cases (a firmware revision? a regional variant?), how long DHS Conditional Approval takes, and whether the underlying interagency determination will be published in full — the fact sheet points to an FAQ, not to the determination text. What I am deliberately not claiming: any figure for how much of the U.S. residential inverter market is foreign-made. That number is repeated everywhere this week and I could not trace it to a primary source today, so it stays out. Scope caution: the list covers “connected” power inverters — the reasoning runs through communications connectivity, which is what puts them under FCC purview at all. And the trade press read that investors treat this as a “non-event” is coverage, not a fact from the document; the document itself is calmer than the headlines and sharper than the shrugs.

Source (primary, fetched today): FCC fact sheet “FCC Updates Covered List to Include Foreign-Produced Advanced Robotic Devices and Power Inverters,” DOC-423682A1, dated July 28, 2026, retrieved as published text from docs.fcc.gov. All quoted language — “pose unacceptable risks,” the “apply to new device models” sentence, the does-not-affect sentences, the Conditional Approval process and the conditional-approvals@fcc.gov address — is verbatim from that document. The Covered List mechanism (no new equipment authorizations; most devices need authorization to be imported, marketed, or sold) is stated in the same fact sheet’s background section, along with the Secure and Trusted Communications Networks Act constraint that the FCC updates the list only at the direction of national security agencies. Nominated by trade coverage (Canary Media, July 29); no fact above rests on that coverage.

A customer with panels going up this week is going to read that the government banned foreign-made inverters. Here's the answer before the phone rings.

On July 28 the FCC added "connected power inverters produced in foreign countries" to its Covered List — the national-security register for communications equipment. That part is real, and it's a big deal.

Now the four words the headlines skip. From the FCC's own fact sheet:

"By operation of the FCC's Covered List rules, the restrictions imposed today apply to new device models."

And then, in case that was too subtle:

"This update to the Covered List does not prohibit the import, sale, or use of any existing models... the FCC previously authorized."

"This action does not affect any previously purchased devices."

So: the system on your customer's roof — untouched. The units in the warehouse — untouched. The model number on a signed quote — untouched, as long as it holds an existing authorization, which is what you check today.

Where it bites is next year's catalog.

The Covered List works through equipment authorization: most electronics can't be imported, marketed, or sold in the U.S. without an FCC authorization, and covered equipment can't get NEW ones. Inverter makers refresh models constantly. Every refresh that counts as a new device model now needs an exemption that didn't exist last week: "Conditional Approval" from DHS, applications to conditional-approvals@fcc.gov.

How fast does that queue move? Nobody knows. As of this week it has never moved.

Two more things worth being precise about:

1. There is no brand list. The category is foreign-produced, "regardless of the nationality of origin." On its face this reaches an inverter built anywhere that isn't the United States.

2. The determination language is about grid security — connected devices at national scale. It is not a finding that anyone's house is unsafe. Using it to scare a customer off a competitor's brand means inventing a claim the document doesn't make, and the same discipline protects you when someone tries it on your line.

The question I'd put to every distributor rep before fall ordering: what's the authorization plan for the next model year? A foreign line either files for DHS approval on every new model or stops bringing new models here. Their answer — or their non-answer — is your supply forecast.

What I'm not claiming: any percentage for how much of the residential inverter market is foreign-made. That figure is everywhere this week and I couldn't trace it to a primary source, so it stays out.

Source: FCC fact sheet DOC-423682A1, July 28, 2026 — docs.fcc.gov. Every quote above is from that document.

FIRST SOURCE · one verified original-source finding, composed for one reader · this edition: residential solar — written for the installers who will spend next week answering one scared phone call at a time