Enphase Energy, Inc. (ENPH)

Enphase designs and sells home energy systems built around the microinverter, a small power converter fitted to each solar panel that turns the panel's direct current into household alternating current, instead of one central string inverter for a whole roof. Around it sit IQ Batteries, EV chargers, load controllers, gateways and the Enphase App, run as one system from its cloud software. By the end of 2025 it had shipped about 86.4 million microinverters, and more than 5.1 million Enphase systems were deployed in over 160 countries. 232425

How it operates

Enphase designs and sells home energy systems built around the microinverter, a small power converter fitted to each solar panel that turns the panel's direct current into household alternating current, instead of one central string inverter for a whole roof. Around it sit IQ Batteries, EV chargers, load controllers, gateways and the Enphase App, run as one system from its cloud software. By the end of 2025 it had shipped about 86.4 million microinverters, and more than 5.1 million Enphase systems were deployed in over 160 countries. 232425

It sells mainly to solar distributors, which bundle its products with panels and racking and resell them to installers. It also sells directly to large installers, to panel makers that build its microinverters into their products, and to partners such as companies that finance home solar through leases and power purchase agreements, known as third-party ownership (TPO). One customer accounted for about 39% of 2025 revenue, after 48% in 2024 and 40% in 2023, and at year end three customers owed 31%, 22% and 14% of its receivables. Its installer network counts more than 1,900 installers. 26272829

The United States brought in 1.2 billion dollars, 80.7% of 2025 revenue, up 27.2%; international markets 284.3 million, 19.3%, down 28.2%. The American share has climbed quickly: 81% of revenue in 2025 against 64% in 2023. 3027

Contract manufacturers build much of what it sells: Flex, Salcomp Manufacturing India and Sunwoda Electric assemble and test microinverters, batteries, EV chargers and gateways, and DHL, Flex and others run its logistics. It has moved a large part of production to the United States, to plants in South Carolina and Texas, including its own facility in Arlington, Texas, where Enphase manufacturing began in November 2025; with Flex, its American lines can make about five million microinverters a quarter. It still uses contract manufacturing in China and India, and the lithium iron phosphate cells in its batteries come from only two vendors, both in China. 31323334353637

The specifics

Enphase was founded in March 2006 and says it pioneered the semiconductor-based microinverter. It argues that string inverters are the most common part of a solar installation to fail, typically carry warranties of only 8 to 12 years and run high-voltage DC wiring that creates a fire risk. It holds about 400 patents with 200 applications pending, mostly on DC to AC power conversion and energy storage. It bought Sofdesk, the solar design business of DIN, 365 Pronto and ClipperCreek in 2021, and SolarLeadFactory and GreenCom Networks in 2022. 38233940414243

It names its competitors by market: SolarEdge, Huawei, Tesla, Sungrow and Growatt in inverters; Tesla, SolarEdge, Huawei, BYD and Franklin Solar Battery in storage; and Wallbox, ChargePoint, Tesla and EVBox in EV chargers. 4445

American tax policy shapes both its demand and its margins. The One Big Beautiful Bill Act of July 2025 ended the Section 25D credit for homeowners who buy systems with cash or loans on December 31, 2025, added timing rules to the Section 48E credit used for leased systems, raised the domestic content bar for that credit's bonus to 45% from 40%, and brought in foreign entity of concern (FEOC) content rules from 2026. In California, the NEM 3.0 policy in force since April 2023 cut what solar owners earn for power sent to the grid to about $0.05 to $0.08 per kWh, from $0.25 to $0.35. 46474849505152

Its distribution channel is under strain: the filing says the prolonged softness in solar demand has left some distributors and installers short of cash, bankrupt or closed, hurting its revenue and profit. 53

What drives growth, line by line

Revenue rose 11% to 1.5 billion dollars in 2025, driven primarily by a 36% jump in battery shipments, to 706.1 MWh from 521 MWh, partly offset by a 2% fall in microinverter units, to about 6.4 million from 6.5 million. The fourth-generation system with the IQ Battery 10C, which the company says is 30% more energy-dense than earlier models, began shipping in the United States in June 2025. 545556

United States. 1.2 billion dollars, 80.7% of revenue, up 27.2%. The filing credits higher demand and $91.2 million of microinverter shipments tied to safe harbor transactions with customers, which came through agreements with solar and battery financing companies that offer leases and power purchase agreements to homeowners. 305758

International. 284.3 million dollars, 19.3% of revenue, down 28.2%, which the filing puts down to continued soft demand in Europe, slower economic growth there, changes in government policies and lower utility rates. 3059

Gross margin slipped to 46.6% from 47.3% on product mix and higher tariff costs, even though the US manufacturing credit (AMPTC) contributed $238.7 million, or 16.2 percentage points, up from 11.8 points, as more of what it sold was made in America. Restructuring at the end of 2024 cut research and development spending by 6% and sales and marketing by 4%, and net income rose to 172.1 million dollars. 606162636455

What comes next, in the company's own words: it expects third-party ownership to be an important growth channel for American home solar and batteries now that the Section 25D credit has expired, and expects the European business environment to remain constrained in 2026. In December 2025 it began shipping the IQ9N-3P commercial microinverter, which it calls the first microinverter powered by gallium nitride. 586566

The read's section on the people who run it is on the People tab.

What the desk infers Inferred

1. Inferred

   The customer that took 39% of 2025 revenue is almost certainly a solar distributor buying mainly for the United States.

   Because

   • The filing says it primarily sells to solar distributors, which resell to installers. 26
   • One customer took about 39% of 2025 revenue, 48% in 2024 and 40% in 2023. 27
   • International revenue was only 19.3% of the total, less than that one customer's 39%, so most of what it bought must have been for the United States. 3027
   • Three customers owed 31%, 22% and 14% of receivables at year end, the shape of a channel run through a few large distributors. 28
   Confidence 75 of 100Wrong if A filing naming the 39% customer as an installer, a panel maker or a financing company, or placing most of its purchases outside the United States.
2. Inferred

   Enphase's profit now leans on American tax policy at both ends: a manufacturing credit supplies a large part of its gross margin, and homeowner and lease credits shape its demand, and the 2025 law changes both.

   Because

   • The manufacturing credit for US-made microinverters and batteries (AMPTC) contributed $238.7 million and 16.2 of its 46.6 points of gross margin in 2025. 626160
   • It says it moved manufacturing to the United States in part to benefit from incentives under the IRA. 67
   • The homeowner credit under Section 25D expired at the end of 2025, and new foreign-entity content rules apply to projects and components from 2026. 4850
   • Its battery cells come only from two vendors in China. 37
   Confidence 75 of 100Wrong if A year in which gross margin holds near its 2025 level with little or no AMPTC benefit.
3. Inferred

   Part of 2025's American growth came from customers buying microinverters ahead to secure tax credits under safe harbor agreements, rather than from more homes being fitted that year.

   Because

   • US revenue rose 27%, which the filing credits to higher demand and $91.2 million of microinverter shipments tied to safe harbor transactions. 57
   • The safe harbor agreements were with solar and battery financing companies offering leases and power purchase agreements, signed as the homeowner credit ran out at the end of 2025. 58
   • The 2025 law ties the credit for leased systems to when projects begin construction. 48
   • The filing says the timing and structure of these transactions made its quarterly revenue more variable. 68
   Confidence 60 of 100Wrong if A filing showing that the microinverters shipped under the safe harbor transactions were installed on homes during 2025.