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Choosing suppliers: the public evidence on modules, inverters, trackers, batteries and transformers

62 sourced entries · Checked October 17, 2026

This site does not rank vendors. What it can do is put the public evidence in one place: the independent reliability scorecards and what they test, the market reports and whose list each is, and the rules that decide eligibility before any quote is compared: prohibited-foreign-entity limits, domestic content, trade cases, forced-labor enforcement, fire-safety standards and inverter ride-through requirements.

Jump to: Independent reliability testing · Market reports and supply conditions · Rules that decide what can be bought · Diligence and contract terms

Read the names carefully. Where a manufacturer is named below, it is because a named third party (a test lab, an analyst firm, an agency) published that name in that context, and the entry says who. Inclusion on a scorecard is a test result on a specific bill of materials, not a recommendation; the labs themselves say certification is a floor.

Independent reliability testing

What the module, inverter and battery scorecards test, how they define a top performer, and what the latest editions found.

Before reading the names. A scorecard result is a test on one bill of materials and says nothing about tax-credit eligibility. Many manufacturers named by the labs below are China-headquartered and may be prohibited foreign entities under the 2025 law (see the rules section); a passing test does not change that, and only a supplier certification and the Treasury rules settle it.
Our reading, not a sourced statement. The labs are saying the same thing from two directions: failure rates in extended testing are rising, and a certificate alone does not tell a buyer which bill of materials passed. Ask for the BOM-specific report, not the brand.

Market reports and supply conditions

Published rankings and market-share statements (reported as whose list each is), installation volumes, and lead-time evidence for transformers.

Before reading the names. Rankings below are global and are the analyst firm's own; they are not U.S. eligibility lists. Several top-ranked inverter and storage integrators are China-headquartered, and at least one top-ranked inverter maker does not sell into the U.S. utility-scale market. Treat every name as PFE-status unknown until the supplier certifies otherwise.

Rules that decide what can be bought

Tax-credit eligibility (prohibited foreign entity and domestic content), trade remedies, forced-labor enforcement, battery fire-safety standards, and inverter ride-through requirements.

  • SEIA/WoodMac describe Treasury's Notice 2026-15 as leaving PFE definitions unresolved. (SEIA/Wood Mackenzie US SMI 2025 Year in Review exec summary, 2026)
  • OBBBA (Pub. L. 119-21, signed July 4, 2025): wind/solar beginning construction after July 4, 2026 must be placed in service by Dec 31, 2027. (K&L Gates client alert, July 23, 2025)
  • OBBBA: projects beginning construction after Dec 31, 2025 lose 45Y/48E credits if they include material assistance from a prohibited foreign entity. (K&L Gates client alert, July 23, 2025)
  • OBBBA domestic content thresholds (the share of manufactured-product cost that must be U.S.-made to earn the 10% domestic-content bonus; a bonus, not an eligibility test) rise by construction start: 40% before June 16, 2025; 45% interim 2025; 50% in 2026; 55% after 2026. (K&L Gates client alert, July 23, 2025 (Appendix B))
  • Treasury/IRS Notice 2026-15 (Feb 12, 2026) gives interim rules and safe harbors for the material assistance cost ratio (MACR, the share of a project's manufactured-product cost that is not from a prohibited foreign entity); the PFE definition is deferred to proposed regulations. (IRS news release IR-2026-23, Feb 12, 2026)
  • Notice 2026-15 MACR thresholds for 2026 construction starts: 40% non-PFE share for qualified facilities (solar), 55% for energy storage. (pv magazine USA, Feb 13, 2026)
  • Notice 2026-15 has three safe harbors (Identification, Cost Percentage, Certification); supplier certifications must be attached to the credit form. (K&L Gates client alert, March 2, 2026)
  • Under Notice 2026-15, taxpayers may generally rely on direct supplier certifications of no PFE material assistance. (Jones Day client alert, Feb 2026)
  • Notice 2024-41 (May 16, 2024) created the New Elective Safe Harbor using DOE cost percentages for the domestic content manufactured-products test. (Gibson Dunn client alert, May 20, 2024)
  • Notice 2025-08 (effective Jan 16, 2025) issued the First Updated Elective Safe Harbor for domestic content, covering grid-scale and distributed BESS. (IRS Notice 2025-08, Jan 2025)
  • Commerce final AD/CVD on cells from Cambodia, Malaysia, Thailand, Vietnam announced April 21, 2025, among the first CVD investigations with affirmative transnational-subsidy findings. (U.S. Department of Commerce press release, April 21, 2025)
  • Commerce final AD/CVD on cells from India, Indonesia, Laos (Sept 11, 2026): weighted-average AD margins 123.04% India, 94.36% Indonesia, 65.43% Laos; the fact sheet notes the ITC was running its injury investigations concurrently. The ITC's final affirmative determination followed on Oct 14, 2026. (International Trade Administration fact sheet, Sept 11, 2026)
  • Section 201 safeguard tariffs on imported solar modules expired Feb 6, 2026 after eight years; the final rate was 14% for 2025. (Solar Power World, Feb 9, 2026)
  • In the earlier Cambodia, Malaysia, Thailand and Vietnam case, Commerce's antidumping duty orders became applicable June 24, 2025, after the ITC notified Commerce of its final affirmative determinations on June 9, 2025. (White & Case client alert, Sept 2024)
  • UFLPA enforcement 2025: CBP stopped over 16,700 shipments worth nearly $3.7 billion through Aug 1; Qcells' Korean cells were detained then released. (pv magazine USA, Sept 24, 2025)
  • CBP expects detailed bills of materials and product-specific documentation under UFLPA; generic supplier certifications, form letters and basic invoices are inadequate in high-risk sectors, and battery supply chains are especially susceptible to scrutiny. (Troutman Pepper Locke client alert, Feb 2, 2026)
  • NFPA 855 2026 edition makes hazard mitigation analysis the default expectation for most ESS installations and explicitly requires large-scale fire testing alongside UL 9540A. (Energy-Storage.news, April 29, 2026)
  • UL 9540A sixth edition (2026) adds system-level large-scale fire testing with pass/fail criteria barring unit-to-unit propagation. (Energy-Storage.news, April 1, 2026)
  • UL describes UL 9540A as the standard test method for thermal runaway fire propagation, aligned with NFPA 855 Annex G.11. (UL Solutions, The Code Authority, 2026)
  • FERC Order 909 approved NERC PRC-029-1 (IBR ride-through) and PRC-024-4, effective Aug 28, 2025. (Federal Register, FERC Order No. 909, July 29, 2025)
  • PUCT approved ERCOT NOGRR 245 effective Oct 1, 2024; post-Aug 1, 2024 SGIA IBRs must meet IEEE 2800-2022 voltage ride-through. (ERCOT Market Notice M-A010825-01, Jan 8, 2025)
  • ERCOT set Sept 15, 2025 as the final deadline for NOGRR245 ride-through extension submissions and exemption notices; it has passed. (ERCOT Market Notice M-A010825-06, July 24, 2025)
  • IEEE 2800-2022 (published April 22, 2022) sets IBR interconnection performance criteria including VRT/FRT; adoption is by the governing authority. (NRECA Business & Technology Strategies advisory, July 2022)
  • USITC final affirmative injury determination, Oct 14, 2026, in the crystalline silicon PV cells and modules investigations covering India, Indonesia and Laos (Inv. Nos. 701-TA-772-774 and 731-TA-1756-1758): Commerce will issue antidumping and countervailing duty orders; the Commission's report (Publication 5804) is due on its website by Nov 23, 2026. (USITC News Release 26-147, Oct 14, 2026)
  • In the earlier Cambodia, Malaysia, Thailand and Vietnam case, Commerce's antidumping duty orders became applicable June 24, 2025, after the ITC notified Commerce of its final affirmative determinations on June 9, 2025. (Federal Register, June 24, 2025, doc. 2025-11588 (antidumping duty orders))
  • The ITC's vote in the Cambodia, Malaysia, Thailand and Vietnam case was May 20, 2025: material injury from imports from Malaysia and Vietnam, threat of material injury from Cambodia and Thailand. (USITC News Release, May 20, 2025)
Our reading, not a sourced statement. Eligibility screens come before price. A module that trips a prohibited-foreign-entity threshold, a battery that cannot show BOM-level traceability at the border, or an inverter that cannot meet ride-through requirements is not cheaper, whatever the quote says.

Diligence and contract terms

What published procurement guides say buyers inspect, warrant and allocate: factory audits, pre-shipment inspection, warranty terms and backing, force majeure and change-in-law.

How this page was made

Each entry is one statement tied to one public page; a second, independent pass loaded every cited page and kept only the statements that page supports. Secondary reports (trade press, law-firm alerts) are cited as what they are. Nothing here is advice, and this site does not rank, recommend or endorse any company; where a third party publishes a ranking, the entry says whose ranking it is. Found an error? Say so and it will be fixed.

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