The Inverter Entry Moved Two Directions at Once

On August 20, 2026 the Commission modified the power inverter entry on the Covered List. Public Notice DA 26-870, acting on a second National Security Determination from the Department of War dated the previous day, is the first time one of the July additions has been rewritten rather than added to.

It is being read as a narrowing. Half of it is. The other half runs the opposite way, and that half is the one that will cost somebody a bench.

The definition, as adopted

Two things now have to be true before an inverter is covered at all:

“(a) Changes dc power to ac power, to include bidirectional devices, that is intended for use in parallel with an electric utility to supply common loads and sometimes deliver power to the utility, i.e., a utility-interactive inverter as that term is defined in UL 1741 sections 2.1.23, 2.1.52; and (b) Contains, or is designed, equipped, or configured to accept, a component that enables remote communication, control, sensing, data-collection, or monitoring through Ethernet, Wi-Fi, cellular, Bluetooth, or other similar connections, whether wired or wireless.”

And “foreign-produced power inverters” now means inverters that are not either:

“(a) Eligible for the Advanced Manufacturing Tax Credit in 26 U.S. Code § 45X for domestic production or (b) A domestic end product as defined in 48 CFR § 25.101(a) because they are manufactured in the United States and the cost of domestic components exceeds 65% of the total component cost for items delivered in calendar years 2024 through 2028 or 75% for items delivered starting in calendar year 2029.”

Two products swap places

Read the coverage test as a conjunction and the consequence is immediate.

An off-grid inverter loaded with connectivity is now outside the entry, because it fails the first prong. The Department of War’s stated reason is that a unit incapable of connecting to the utility grid carries risk that is limited to local impacts rather than to the interconnected system. Recreational-vehicle, marine and stand-alone battery inverters that are not grid-parallel come out of the category.

A grid-tied inverter shipped with an empty communications slot is inside it. Not because of what the unit does, but because of what it is configured to accept. If a product line offers the communications module as an option on the order form, the base SKU is covered on the same terms as the fully populated one.

That second point is the trap, and it catches the careful reader rather than the careless one. Anyone who read the July entry as reaching wireless connectivity, and concluded that a hardwired or comms-optional unit sat outside it, priced their exposure on a reading the Commission has now foreclosed. The Department of War frames the wired and Ethernet reach as a clarification of the original determination rather than a new restriction; the Commission reads the second determination as both a clarification of the first and a new specific determination in its own right. Either characterisation lands in the same place for a buyer.

The section 45X route is not an offshore route

The tax-credit prong is the genuinely novel part, and it is the one most likely to be misread as an opening. It is not one.

Section 45X is a credit for domestic production. The statute restricts it to components the production of which is within the United States or a possession of the United States. So both prongs of the new definition require domestic manufacture. Nothing here lets an inverter built abroad escape the Covered List.

What differs between the two prongs is the content standard, and that difference is the whole substance of the change:

• 48 CFR 25.101(a) — United States manufacture plus a domestic component-cost floor, currently 65 percent and rising to 75 percent for items delivered from calendar year 2029.
• Section 45X — United States production plus the One Big Beautiful Bill Act’s prohibited-foreign-entity and material-assistance rules. There is no 65 percent floor in that test.

The practical consequence is worth stating plainly, because it changes who is exposed: a United States–built inverter that fails the Buy American component-cost math can still fall outside the Covered List on the tax test. Two products manufactured in the same American plant, with the same bill of materials, can now sit on opposite sides of the line depending on which body of law each one is documented against.

The Department of War’s reasoning for the carve-out is that Congress and the President, through the One Big Beautiful Bill Act, made section 45X–compliant inverters eligible for a domestic-production credit and therefore determined that such inverters should be considered domestically produced. That is industrial policy doing regulatory work, and it is a mechanism worth watching, because it can be repeated in any category where a parallel credit exists.

What this does to the diligence question

Before August 20, the vendor question for an inverter was the one this practice has been asking since July: does this product qualify as a domestic end product under 25.101(a), as delivered, and can you show the component-cost math. That question survives. It is now the second of three.

• Is it utility-interactive as UL 1741 defines the term? If it cannot operate in parallel with the grid, the analysis stops there.
• Does it contain, or is it designed, equipped or configured to accept, a remote-communication component? That is a property of the product architecture and the order form, not of the unit in the crate. A negative answer has to be evidenced at the design level.
• If both are yes, which exit is being claimed — 25.101(a) or section 45X? These are different files. The first is a component-cost calculation. The second is a tax-credit eligibility position resting on the material-assistance rules. A vendor asserting the second should be able to say so in those terms.

A vendor who answers the second question with “it ships without a radio” has not answered it.

One more line, easy to miss

The notice also states that equipment covered by category is identified “by place of production, not by entity,” and that the Commission’s entity-directed rules therefore do not attach to those entries.

That is the cleanest answer available to the question buyers ask most often, which is whether a particular manufacturer is “on the list.” For the category entries, no manufacturer is. The category is. A company can find every one of its products covered without ever being named, and being unnamed is not a defence.

Robotics is untouched

None of this reaches advanced robotic devices. That entry retains the single definition adopted on July 27 — the Buy American domestic-end-product test — with no tax-credit alternative, no connectivity qualifier, and a Conditional Approval from the Department of War as its only exception. The two categories were defined identically for twenty-three days. They are not any more, and any analysis that still treats them as a matched pair is out of date.

Read against the primary text on August 20, 2026 — Public Notice DA 26-870 and the Second Power Inverter National Security Determination attached to it as Appendix B, with 26 U.S.C. § 45X and 48 CFR § 25.101 as published. This regime moves quickly; verify the current posture before relying on any of it, including this reading.