Silfab Prime BC vs SunPower Maxeon 7 — Made-in-North-America Solar Panels (2026)
Two premium residential panels head-to-head on the North American assembly question — Silfab Prime BC (Bellingham WA + Fort Mill SC) vs SunPower Maxeon 7 (Malaysia + Mexico). BABA compliance, IRA §48 domestic content, DAM eligibility, tariff exposure, and every stocked SKU.
The domestic-content question decides more solar panel POs in 2026 than efficiency or warranty combined. Federally-funded projects require BABA (Build America Buy America) compliance letters. IRA §48 domestic-content bonus adds a 10-percentage-point tax credit for projects where the manufactured products (including modules) meet domestic-content thresholds. Davis-Bacon prevailing-wage rooftops (USDA REAP, DoD IDIQ, state-agency contracts) explicitly require US-assembled modules. Section 201 and Section 301 tariffs on Chinese solar panels add another 25-50 %/W to imported product landed cost. This guide is what a contractor needs to walk from "school district rooftop, IRA §48 domestic-content bonus required" to a signed PO in one session — the two North American premium panels are Silfab Prime BC and SunPower Maxeon 7.
Both brands market themselves as "American" or "Western" solar. The truth is more nuanced. Silfab is genuinely US-assembled at three facilities (Bellingham WA, Burlington WA, Fort Mill SC) with US-manufactured cells rolling out at Fort Mill in 2026. SunPower Maxeon 7 is Malaysia + Mexico assembled with no US facility as of 2026 — Maxeon is a Singapore-listed company. For a project that needs a BABA compliance letter, Silfab is the pick; Maxeon is not.
Understanding the three overlapping domestic-content rules that apply to solar panels:
| Rule | Applies to | Requirement | Silfab Prime BC-DCA | SunPower Maxeon 7 |
|---|---|---|---|---|
| BABA (Build America Buy America) | Federally-funded infrastructure (IIJA, IRA, USDA REAP, DoD) | Manufactured product = US-assembled with >55% US-manufactured components by cost | Compliant on DCA suffix (US cells 2026) | Not compliant — Malaysia/Mexico assembly |
| IRA §48 domestic-content bonus (10 pp ITC kicker) | Investment Tax Credit projects placed in service after 2023 | Adjusted percentage of manufactured products = 40% (residential/C&I) or 55% (utility) | Module assembly + US cell = 40-55% domestic | 0% domestic on Maxeon 7 |
| Davis-Bacon prevailing-wage | Federal + many state contracts | Prevailing-wage labor + often domestic-preference clauses | Silfab + US labor = full compliance | Panel imported — labor compliance separate |
| Section 201 tariff | All imported crystalline silicon PV cells + modules | 14.25% ad valorem (2026, declining) | US-assembled + US cells 2026 = tariff-exempt | Malaysia + Mexico assembly = subject to tariff |
The DCA suffix is the compliance flag on Silfab. Verify it on every PO.
Silfab ships Prime BC modules under two SKU variants: SIL-440-BC (standard, US-assembled, Malaysian cells — DAM compliant, not full BABA) and SIL-440-BC-DCA (US-assembled with US-manufactured cells from Fort Mill, full BABA compliant). The DCA suffix stands for Domestic Content Article. If your project needs full BABA compliance (not just module-assembly DAM), your PO line item must specify the DCA variant. PES flags the DCA suffix in the SKU search and on the packing list.
Silfab Prime BC uses a back-contact (BC) architecture — all metal contacts on the rear of the cell. SunPower Maxeon 7 uses interdigitated back-contact (IBC) — a specific back-contact architecture with interleaved rear contacts (SunPower's original 2007 patent). Both eliminate front-side busbar shading and both deliver clean all-black aesthetics. The efficiency difference: Silfab 22.5 %, Maxeon 24.1 %. Cost difference at PES: Silfab ~$0.66/W, Maxeon ~$0.85/W.
| Spec | Silfab Prime BC (SIL-440-BC-DCA) | SunPower Maxeon 7 (SPR-M440-COM) |
|---|---|---|
| Rated power | 430 / 435 / 440 W | 430 / 435 / 440 W |
| Cell technology | BC (back-contact) | IBC (interdigitated back-contact) |
| Module efficiency | 22.5 % | 24.1 % |
| Voc @ STC | 39.8 V | 40.5 V |
| Isc @ STC | 14.10 A | 13.90 A |
| Max system voltage | 1000 V DC (residential UL) | 1000 V DC (residential UL) |
| Temp coef Pmax | −0.26 %/°C | −0.26 %/°C |
| Product warranty | 30 yr | 40 yr |
| Performance warranty | 30 yr @ 88.5 % | 40 yr @ 88.3 % |
| 1st-yr degradation | 1.0 % | 1.0 % |
| Linear degradation | 0.4 %/yr | 0.25 %/yr |
| Dimensions | 1765 × 1048 mm | 1812 × 1046 mm |
| Weight | 20.5 kg | 21.0 kg |
| Frame | Black anodized alum. | Black anodized alum. |
| Country of assembly | Bellingham WA + Burlington WA + Fort Mill SC | Malaysia + Mexico |
| Cell manufacturing | Fort Mill SC (US cells 2026 / -DCA suffix) | Malaysia |
| BABA status | Compliant on DCA | Not compliant |
| IRA §48 domestic bonus | Eligible on DCA | Not eligible |
| Section 201 tariff exposure | 0 % (US-assembled + US cells) | 14.25 % ad valorem |
| Connector | MC4 EVO2 | MC4 EVO2 (or AC-ready with Enphase IQ8P) |
| Certifications | UL 61730, IEC 61215/61730, Buy American Act | UL 61730, IEC 61215/61730, IEC TS 63397 |
See the hero chart above for a visual head-to-head across the six domestic-content metrics that matter. Below is the same picture in 25-year cash-flow terms on a 10 kW residential rooftop in Louisville, KY, comparing three scenarios: Silfab BC-DCA, SunPower Maxeon 7, and (for reference) a Chinese-origin panel with §201 tariff.
10 kW residential rooftop — Louisville, KY, 25-year view
- Silfab Prime BC-DCA: 24 mod × 440W = 10.56 kW-DC. Panel cost ~$0.66/W = $6,970. IRA §48 domestic-content bonus adds 10 pp ITC on the module portion, worth ~$700. Net panel cost: ~$6,270. Year-25 yield: 92% × nameplate × Louisville avg = ~355,000 kWh cumulative.
- SunPower Maxeon 7: 24 mod × 440W = 10.56 kW-DC. Panel cost ~$0.85/W = $8,980. No IRA §48 bonus (Malaysia/Mexico). Net panel cost: $8,980. Year-25 yield: 93.5% × nameplate × Louisville avg = ~360,000 kWh cumulative.
- Reference — Chinese-origin BC: Panel cost ~$0.45/W + 14.25% §201 tariff = $0.514/W = $5,430. No IRA §48 bonus. Net cost: $5,430. Similar 25-yr yield.
Silfab BC-DCA delivers the best cost per compliant watt for federally-funded projects: $6,270 net vs Maxeon $8,980 for essentially the same panel performance. Maxeon wins the pure-efficiency race and the 40-year warranty runway. For non-federal cash-flow projects, the Chinese-origin reference is cheapest — but the tariff is climbing and the compliance-check letter is worthless.
A BABA compliance letter for a solar module has to cover three lines:
Manufactured product = domestic.
The module (including its frame, glass, encapsulant, and backsheet) has to be assembled in the US. Silfab meets this on all three facilities (Bellingham WA, Burlington WA, Fort Mill SC). Maxeon does not.
>55% of manufactured component cost is US-manufactured.
The cells, glass, backsheet, aluminum frame, junction box, and MC4 connectors all count. Silfab's Fort Mill SC facility manufactures cells + modules on site — the -DCA suffix indicates a >55% US-content module. Silfab non-DCA SKUs are US-assembled with Malaysian cells (compliant with DAM but not full BABA).
Bill of materials / mill test cert available.
Silfab provides a BABA compliance certificate with each -DCA shipment, listing US-content by cost. PES forwards this to the project GC on request — it goes into the federal audit file.
Racking — both drop into IronRidge, Unirac, EcoFasten portrait layouts.
Silfab Prime BC (1765×1048 mm) and Maxeon 7 (1812×1046 mm) are within 3% dimensional match — the same rail cut list and clamp positions work for both. If retrofitting an existing installation from one to the other, no rail rework.
MC4 EVO2 — Silfab standard, Maxeon has AC-ready option.
Silfab Prime BC ships standard MC4 EVO2 DC connectors. Maxeon 7 is available in DC-only OR AC-ready (SPR-M440-AC with integrated Enphase IQ8P microinverter — 240V AC output at the panel, no rooftop DC).
Rapid shutdown — Maxeon 7 AC is native, Silfab needs MLPE.
Maxeon 7 AC = native NEC 690.12 module-level RSD (no external MLPE required). Silfab Prime BC needs Tigo TS4-A-F, Enphase IQ8+/IQ8H, or SolarEdge S/P-series to hit module-level compliance. Both brands are on Enphase and SolarEdge approved-vendor lists.
Warranty registration — different processes.
Silfab: online registration at silfab.com/warranty inside 90 days. Maxeon: registration via the Maxeon Solar portal (different from legacy SunPower registration) at maxeonsolar.com/warranty inside 60 days. PES auto-registers eligible warranties for verified contractor accounts on both brands at ship.
Tariff and duty exposure on landed cost.
Silfab: 0% Section 201 tariff (US-assembled + US cells on DCA). Maxeon: 14.25% Section 201 tariff on Malaysia-assembled + 14.25% on Mexico-assembled (with residual §201 exposure under AFPRA rulings). PES quotes landed cost including tariff at checkout.
| Application | Recommended brand | Why |
|---|---|---|
| Federally-funded school district / USDA REAP / DoD | Silfab Prime BC-DCA | Only BABA-compliant premium panel in the segment. |
| IRA §48 domestic-content bonus (10 pp ITC) | Silfab Prime BC-DCA | Module assembly + US cells = §48 eligible. |
| Davis-Bacon prevailing-wage residential | Silfab Prime BC | US labor + US module = compliance stack complete. |
| Luxury private residential, 40-yr warranty priority | SunPower Maxeon 7 | Longest warranty + highest efficiency in segment. |
| Non-federal commercial, cost-optimized | Silfab Prime BC (non-DCA) | US-assembled DAM at lower cost than DCA — no §48 bonus. |
| Complex rooftop with shading | SunPower Maxeon 7 AC (integrated Enphase) | Panel-level MLPE + shade tolerance. |
| Tariff-sensitive project | Silfab Prime BC-DCA | 0% §201 tariff exposure vs 14.25% on Maxeon. |
Every SKU below is stocked in the PES Louisville warehouse or on a bonded pipeline PO. Prices shown are public retail; verified contractor accounts see 5–22% off list at Tier 1 – Tier 3. Freight is quoted at checkout.
Every SKU below is stocked in the PES Louisville warehouse or on a bonded pipeline PO. Prices shown are public retail; verified contractor accounts see 5–22% off list at Tier 1 – Tier 3. Freight is quoted at checkout.
Step 1 — Confirm the domestic-content requirement.
Federal money, IRA §48 bonus, Davis-Bacon, or BABA compliance letter needed? Silfab Prime BC-DCA is the only pick. No federal money and no BABA requirement? Both are on the table.
Step 2 — Fix the warranty budget.
30-year commercial / long-hold residential: Silfab (30/30 @ 88.5%). 40-year generational asset: Maxeon (40/40 @ 88.3%).
Step 3 — Match to inverter architecture.
Silfab: standard DC-out, compatible with any string / hybrid inverter or Enphase/SolarEdge MLPE. Maxeon: DC-out standard, OR AC-ready with integrated Enphase IQ8P for native RSD.
Step 4 — Quote landed cost including tariff.
Silfab BC-DCA: 0% §201 tariff. Maxeon 7: 14.25% §201 tariff on Malaysia + Mexico assembly. PES quotes landed cost at checkout.
Step 5 — Verify the SKU suffix on the PO.
Silfab: DCA suffix = full BABA compliance (US cells). Non-DCA = DAM only (US assembly, Malaysian cells). Verify with your project GC that the correct variant is on the PO.
Which solar panels are made in the USA?
Silfab Solar operates three US facilities: Bellingham WA (2 GW, 2018+), Burlington WA (open 2024), and Fort Mill SC (5 GW module + 1 GW cell, phased 2024-2026). Silfab is the largest US-assembly solar module manufacturer by capacity. First Solar operates thin-film CdTe facilities in Perrysburg OH and other US sites (different technology). LONGi operates the Illuminate USA joint venture in Pflugerville TX (5 GW, 2024). QCells operates Dalton GA (5 GW, 2019+) and Cartersville GA (2024). JA Solar operates Phoenix AZ (2 GW, 2024). Trina operates Wilmer TX (5 GW, 2025). Canadian Solar operates Mesquite TX (5 GW, 2025). Jinko operates Jacksonville FL (2 GW, 2024). All ship BABA-compliant SKUs to varying levels of cell-content depth.
Is SunPower Maxeon made in the USA?
No — Maxeon 7 is assembled in Malaysia and Mexico with Malaysian cell manufacturing. There is no US SunPower or Maxeon module-assembly facility as of 2026. SunPower Corporation (the US residential installer, filed Chapter 11 in 2024) is separate from Maxeon Solar Technologies (Singapore-listed panel manufacturer). Maxeon does have a US-cell R&D facility in Albuquerque NM but no volume manufacturing.
What is BABA and what does it require for solar panels?
BABA — Build America Buy America — is a 2021 IIJA statute (updated in the IRA) requiring that manufactured products used in federally-funded infrastructure be produced in the US with >55% US-manufactured components by cost. For solar panels, that means US module assembly + a majority of component value (cells, glass, backsheet, frame, junction box, connectors) manufactured in the US. Silfab Prime BC-DCA is the primary premium panel that meets full BABA as of 2026.
What is the IRA §48 domestic-content bonus?
The IRA §48 domestic-content bonus adds a 10-percentage-point ITC (Investment Tax Credit) kicker on projects placed in service after 2023 where 40% (residential/C&I) or 55% (utility) of manufactured-product costs are US-manufactured (adjusted percentage). Solar modules count as manufactured products. On a 10 kW residential system with $30k eligible basis, the bonus is worth $3,000 of additional tax credit — often the difference between installing and not.
What is the DCA suffix on a Silfab SKU?
DCA — Domestic Content Article — is Silfab's SKU suffix indicating that the module was assembled in a US Silfab facility AND uses US-manufactured cells from the Fort Mill SC cell plant. Silfab modules without the DCA suffix are US-assembled with Malaysian cells (DAM compliant, not full BABA). For projects requiring full BABA / IRA §48 domestic-content bonus, the SKU line item must specify DCA.
What tariffs apply to imported solar panels in 2026?
Section 201 tariff on crystalline silicon PV cells and modules is 14.25% ad valorem in 2026, declining under the current schedule. Section 301 tariffs on Chinese-origin PV modules add another 25% (with limited exemptions). AD/CVD (antidumping / countervailing duty) exposure on Malaysia, Vietnam, Thailand, and Cambodia added another 30-250% on modules found to be circumventing Chinese cell content (2024 findings). US-assembled panels with US cells (Silfab BC-DCA) have 0% tariff exposure — a $0.05-0.15/W cost advantage in 2026.
Which North American panel has the longer warranty?
SunPower Maxeon 7: 40-year product + 40-year performance @ 88.3%. Silfab Prime BC: 30-year product + 30-year performance @ 88.5%. Maxeon has the longer runway; Silfab has the higher year-30 performance floor. For a 25-30 year hold, both are excellent; for a 40+ year hold, Maxeon is unique.
Which panel is more efficient?
SunPower Maxeon 7: 24.1% module efficiency. Silfab Prime BC: 22.5%. The 1.6% delta is meaningful on footprint-constrained rooftops — 4-6 fewer panels for a 10 kW system means less racking, less labor, and less MLPE. For rooftops with adequate space, the efficiency difference matters less than the compliance and warranty delta.
Do Silfab and Maxeon use the same connectors?
Both ship MC4 EVO2 connectors. Maxeon 7 is also available in AC-ready configuration (SPR-M440-AC with an integrated Enphase IQ8P microinverter — 240V AC output at the panel). Silfab is DC-only.
Are Silfab and Maxeon compatible with SolarEdge and Enphase?
Yes — both are on SolarEdge's S-series and P-series approved-vendor lists and on Enphase's IQ8+/IQ8H/IQ8P compatibility matrix. Silfab pairs cleanly with any external MLPE. Maxeon 7 AC has native Enphase IQ8P integrated — no external microinverter needed.
What does contractor pricing look like at PES on these panels?
Both brands have manufacturer MAP (Minimum Advertised Price) policies capping public list pricing. Contractor pricing is quoted directly to verified accounts at Tier 1 (5-12% off list), Tier 2 volume ($25k+/quarter), or Tier 3 pallet/EPC (12-22% off). Register at axis.pesdistribution.com/portal-registration to see quotes.
Can I mix Silfab and Maxeon on the same rooftop?
Technically yes if they're on separate strings behind separate MPPTs — the Voc/Isc are within 3% and both are on the same MLPE approved lists. Practically no — matching one make/model per array is best practice for warranty, monitoring, and future O&M. If a job needs partial-federal + partial-cash, use Silfab BC-DCA on the federal portion and Silfab non-DCA (or Maxeon) on the cash portion — the visual match is identical.
Open a PES Supply contractor account
Direct-distributor pricing on the full PES Supply solar panel catalog — LONGi, Aiko, JA Solar, Jinko, REC, Silfab, Bluesun, Trina, Canadian Solar, SunPower. Louisville-warehoused, pallet-freight quoted at checkout. Registered contractors also get the PES portal String Sizing, Compatibility, and Freight calculators — cross-links to the Solar Inverter Distributor Hub and the Racking & Mounting Hub live inside the portal.
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