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A US homeowner never asks where the microinverter was made. A US installer bidding a domestic-content project asks nothing else. This guide is written for the second person: distributors, EPCs and installer networks deciding which module-level power electronics (MLPE) brands to carry for the United States and Canada in 2026.

Short answer: for North American projects the brands that matter are Enphase, APsystems, Hoymiles, Generac (Chilicon and PV Link), NEP, Deye, Sparq and Envertech among microinverter makers, plus SolarEdge and Tigo, the two optimizer-based MLPE rivals installers weigh against them. Only Enphase and SolarEdge currently offer US-made MLPE at scale. That matters for the domestic-content bonus, because under IRS Notice 2024-41 the rooftop MLPE category accounts for 35.6% of a residential system’s domestic cost percentage, against a 40% threshold.

Last updated: October 2026. We limited the list to brands with a public North American grid listing or a documented US channel. Certificates, factory locations and dates come from the makers’ own documents, linked at the end. Treat this as a compliance-led shortlist, not a popularity poll.

What “US microinverter brand” should mean

The phrase gets used three ways, and buyers who mix them up lose bids:

  • US-made: assembled in the United States, which is what counts for the domestic-content adder and for Build America, Buy America (BABA) on federally funded work. Today that means Enphase (South Carolina and Texas contract factories) and SolarEdge (Austin, Texas and Tampa, Florida).
  • US-listed: certified to UL 1741 SB and IEEE 1547, with California Rule 21 where needed. Most brands below qualify, whatever their factory location.
  • US-based: headquartered or with a real support office in North America. APsystems (Austin), NEP and Sparq (Ontario) fall here.

A brand can be all three, one, or none. Ask which one your customer actually needs before comparing price.

Compliance matrix for North America

BrandArchitectureUL 1741 SB / Rule 21Rapid shutdown (NEC 690.12)North American production
EnphaseMicroinverter, 1:1YesBuilt inYes, SC and TX (DOM SKUs)
APsystemsMicroinverter, 2:1Yes (DS3 family)Built inNo (US HQ in Austin)
HoymilesMicroinverter, 1:1 to 4:1Yes (HMS-2T-NA)Built inNo
GeneracMicro (Chilicon) and substring optimizer (PV Link)UL 1741PV Link needs SnapRS devicesAsk for each SKU
NEPMicroinverter, 4:1Yes (BDM-1200/1600/2000)Built inNo
DeyeMicroinverter, 2:1 to 4:1Yes (SUN-M G5 US datasheet)SunSpec SRD V2.0 listedNo
SparqMicroinverter, 4:1UL 1741 + SA; Rule 21 on datasheetBuilt inYes, Ottawa (Canada)
EnvertechMicroinverter, 1:1 to 4:1UL 1741 base (SB not shown)AskNo
SolarEdgeDC optimizer + string inverterYesSafeDC built inYes, Austin TX and Tampa FL
TigoOptimizer/RSD add-on (TS4)Depends on paired inverterTS4-F / TS4-A-F certified RSDAsk for each SKU

The ten brands

1. Enphase Energy

Enphase is the incumbent in North America and the only microinverter maker shipping US-made units at scale. It began production with contract manufacturers in South Carolina and Texas in 2023 and said in May 2025 that more than 6.5 million US-made microinverters had shipped, about 80% of its total shipments. The IQ8P-3P for three-phase commercial roofs has shipped from Texas since July 2024. For domestic-content or BABA work, specify the DOM SKUs by name on the purchase order.

2. APsystems

APsystems moved its US headquarters from Seattle to Austin in June 2022, and the US team runs local support and training. The DS3 family is the draw for installers: two modules per unit, 880 VA (DS3), 768 VA (DS3-L) or 640 VA (DS3-S), certified to California Rule 21 under UL 1741 SB. Fewer units mean fewer roof attachments and a shorter trunk cable. Its APsmart rapid-shutdown products, past one million units, give string-inverter installers a second reason to open an account.

3. Hoymiles

Hoymiles is the biggest global shipper outside the US, reporting 17.4% of 2025 global microinverter shipments based on S&P Global Energy data. Its North American HMS-700/800/900/1000-2T-NA two-in-one units list UL 1741, IEEE 1547, UL 1741 SB and Rule 21. The case for Hoymiles in the US is price per watt with full grid compliance. The case against, for some projects, is no US production, so it cannot help a domestic-content bid.

4. Generac (Chilicon Power and PV Link)

Generac bought Chilicon Power, a California microinverter company founded in 2010, on 2 July 2021. Its US installers now see two MLPE options: Chilicon microinverters and the PV Link S2502 substring optimizer that feeds PWRcell batteries (2,500 W, 60 to 420 V, UL 1741). PV Link does not meet rapid shutdown alone; Generac pairs it with SnapRS units under the modules. Installers already selling Generac standby generators find the bundle easy to pitch.

5. NEP (Northern Electric Power)

NEP targets price-led US residential with four-module units. Its UL 1741 SB certificate (231110035GZU-001, 21 March 2024) covers the BDM-1200, BDM-1600 and BDM-2000 at 208/240 V, and the units are on the CEC list. The BDM-2000 handles 2,000 W across four inputs. NEP says it has shipped more than 500,000 units into 35-plus countries.

6. Deye

Deye’s US-market microinverters (SUN-M65/80/100G5-US-Q1) list UL 1741 including SB, IEEE 1547, SunSpec rapid shutdown SRD V2.0 and TÜV Rheinland on a datasheet dated July 2026. It is a logical add for distributors who already sell Deye hybrid inverters in the US, since warranty and support run through one supplier.

7. Sparq Systems

Sparq, based in Kingston, Ontario, builds its QUAD 2000 four-channel micro at OCM Manufacturing in Ottawa. TÜV Rheinland certificate CU 72239343 (7 February 2023) covers UL 1741:2021 plus Supplement A, and the datasheet adds Rule 21 and Hawaii’s HECO Rule 14H. Each channel takes up to 680 Wp. A DM version supports off-grid use, which makes it interesting for Canadian cottages and remote sites.

8. Envertech

Envertech holds an Intertek ETL authorization (21 May 2024) for its EVT500 to EVT2000SE range to UL 1741:2021, Edition 3. The public notice does not mention Supplement SB. Most US utilities now require SB, so request the SB test report before you quote. Until then, Envertech is a watch-list brand for the US, not a default.

9. SolarEdge (optimizer rival)

SolarEdge is not a microinverter maker. It is here because nearly every US installer weighs it against Enphase. Its DC optimizers feed a string inverter, which keeps the conversion electronics off the roof. SolarEdge builds Home Hub inverters in Austin, Texas and Power Optimizers in Tampa, Florida. The Florida plant shipped its first domestic-content optimizers in Q2 2024 and was targeting about two million units per quarter from Q1 2025. Its US-made three-phase inverters with C651U/C652U optimizers and Home Hub inverters with U650 optimizers are BABA compliant.

10. Tigo Energy (optimizer rival)

Tigo sells add-on MLPE rather than a whole system. Its TS4 Flex range covers optimization, monitoring and rapid shutdown, and Tigo says it has tested compatibility with more than 50 inverter brands. SMA sells Tigo TS4-R modules under its own name for US inverters. For installers who want module-level shutdown on a string inverter they already like, Tigo is the usual answer.

Micro or optimizer for a US roof?

Pick microinverters when the roof has several orientations, partial shade, or a likely future expansion, and when the customer wants panel-level data without a wall-mounted inverter. Pick optimizers plus a string inverter when the job adds a battery (DC coupling is simpler), when you want electronics off the roof for easier service, or when the bid needs the SolarEdge domestic-content stack. Both satisfy NEC 690.12 when installed as listed.

For a global view without the US filter, see our top 10 microinverter manufacturers. The optimizer side is covered in detail in solar optimizer manufacturers. Commercial roofs that end up on string inverters also need UL-listed DC disconnects; our guide to UL isolation switch manufacturers explains UL 508i versus UL 98B.

Frequently asked questions

Which microinverters qualify for the US domestic content bonus?

Only products manufactured in the United States can count. Enphase’s US-made IQ8 units (DOM SKUs) and SolarEdge’s US-made optimizers and inverters are the main options. Under IRS Notice 2024-41, rooftop MLPE contributes 35.6% of the domestic cost percentage toward the 40% threshold. Confirm eligibility with a tax adviser for each project.

Is APsystems an American company?

APsystems was founded in Silicon Valley and has had its US headquarters in Austin, Texas since June 2022. Its manufacturing is outside the US, so its products are US-listed but not US-made.

Are Hoymiles microinverters allowed in California?

Yes. The HMS-2T-NA series lists UL 1741 SB and California Rule 21 on its datasheet. Always check the exact model suffix, since EU and AU versions are not listed for the US.

What is the difference between UL 1741 and UL 1741 SB?

UL 1741 is the base safety standard for inverters. Supplement SB adds grid-support functions tested to IEEE 1547-2018, which most US utilities now require for interconnection. A UL 1741 listing without SB may not be accepted.

Can I mix Tigo optimizers with any inverter?

No. Tigo publishes a compatibility list covering more than 50 inverter brands. Rapid-shutdown compliance depends on the specific inverter and transmitter pairing, so check that list before you design.

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