U.S. Bans new foreign solar inverters on security grounds

The U.S. Federal Communications Commission has banned new equipment authorizations for foreign-produced solar inverters. The FCC's Public Safety and Homeland Security Bureau added the inverters to its covered list on July 28, 2026, citing national security and digital espionage concerns.

This action amounts to an immediate ban on new approvals for unapproved foreign models. The directive distinguishes between products seeking new approval and inverters that already hold valid FCC credentials. Existing authorized models can still be imported, sold, and deployed.

Market analysts at Wood Mackenzie noted the ban creates a severe near-term supply imbalance. According to a forecast by Intertek CEA, U.S. Manufacturing will likely only meet 40% of combined solar and battery storage demand through 2027.

Scope of the ban

The ban initially targeted inverters with bidirectional wireless connectivity. Regulators deemed these smart inverters an unacceptable security risk. This decision came despite a January 2026 Department of Energy analysis that inspected 30 Chinese inverters and found zero evidence of malicious hardware tampering.

On August 20, 2026, the FCC clarified and expanded the rule's scope. The updated restriction explicitly includes both wired connections, such as Ethernet, and wireless connections. It applies strictly to utility-interactive inverters compliant with the UL 1741 standard. Off-grid, non-utility-interactive inverters and standalone AC-to-DC rectifiers are excluded.

The language creates near-term ambiguity for hardwired utility-scale inverters. Leading manufacturers are notifying clients that they believe their products do not fall under the ban's scope.

Compliance pathways and domestic supply

Overseas suppliers can seek a conditional approval from the Department of Homeland Security or Department of Defense by January 1, 2028. This process requires rigorous supply chain audits, similar to those for imports subject to Foreign Entity of Concern requirements.

The FCC defines foreign hardware using the Buy American standard. This allows potential exemptions for foreign-owned vendors that complete final assembly in U.S. Factories. Intertek CEA noted that past approvals for similar restrictions included no Chinese-headquartered manufacturers.

The August 20 update added an explicit compliance exemption. Inverters that qualify for the Section 45X Advanced Manufacturing Production Credit will not be classified as “foreign-produced” on the Covered List.

Wood Mackenzie reported that total domestic inverter manufacturing capacity is expected to exceed 100 GW by late 2027, driven by federal incentives. Despite this, Intertek CEA's research suggests fully operational capacity may lag, potentially covering only about 40% of near-term demand.

Technical and market impacts

The regulatory environment requires buyers to scrutinize the bill of materials for every inverter. Analysts at Intertek CEA pointed out that historic equipment filings often cover internal wireless communication chips rather than whole inverter enclosures. If federal authorities apply restrictions broadly, the legal standing of many current product series could face sudden challenges.

Switching component vendors is complex. It requires updated short circuit models, new thermal calculations, and revised protection settings. Submitting updated engineering files to regional grid operators routinely triggers material modification clauses. This can lead to long delays and even strip a project of its position in the interconnection queue.

Short-term costs are expected to rise due to inverter supply constraints. Wood Mackenzie's reporting indicates that increasing domestic capacity should help moderate prices by late 2027. The industry must now transition from a focus on low hardware costs toward a strategy that prioritizes national security compliance and long-term supply chain certainty.

Some suppliers had explored a "dumb box" workaround by removing all internal wireless communication modules at the overseas factory. The FCC explicitly closed this loophole in its August 20 revision. An inverter is now subject to the ban if it contains-or is designed to accept-a remote communication component.

The federal government's focus on digital vulnerabilities is forcing the solar industry to rapidly mature its code maintenance protocols. Developers are adopting strong software supply chain protections common in more mature sectors.