Enphase Energy Inc (NASDAQ:ENPH) shares advanced 6.7% in premarket trading Thursday after two developments bolstered investor interest: a rating upgrade from Barclays and the start of production shipments for the company’s latest commercial microinverter.
Barclays analyst Christine Cho elevated Enphase from Underweight to Equalweight and increased the price target to $51 from $30. The analyst pointed to the company’s solid-state transformer - or SST - initiative as the central rationale for the upgrade, estimating an annual U.S. addressable market on the order of $2 billion by the late 2020s.
"ENPH’s solid-state transformer (SST) initiative represents a credible entry point into the evolving data center power stack," Cho said. "As hyperscalers migrate toward 800V DC architectures to support higher rack densities, SSTs are expected to become a core component, replacing or displacing traditional transformers, UPS systems, and PDUs. Unlike legacy hardware, SSTs resemble inverters in functionality - leveraging active power conversion and control - which plays directly to ENPH’s technical strengths."
The Barclays note added that if Enphase and SolarEdge maintain their design lead, they could be positioned to capture early share as 800V data centers scale into 2028-2029. That potential market opportunity underpinned the analyst’s upward revision of the firm’s view on the stock.
Separately, Enphase announced it has started production shipments in the United States of the IQ9S-3P Commercial Microinverter. The device is built using gallium nitride (GaN) technology and is designed to support solar modules up to 770 watts. It plugs directly into three-phase 480Y/277 V grid configurations without the need for external transformers.
According to the company, the IQ9S-3P provides up to 548 VA of continuous output power and posts a CEC weighted efficiency of 97.5%. The product is offered with a 25-year limited warranty and is manufactured in U.S. facilities; Enphase noted that the domestic production could make units potentially eligible for domestic content bonus tax credits under applicable rules.
Enphase also indicated that safe harbor orders for the IQ9S-3P will remain open until July 4, 2026, aligning with federal tax credit timing for customers considering eligibility.
Market reaction and context
The Barclays upgrade and the commencement of production shipments were cited together as drivers of the premarket price move. The analyst’s emphasis on SSTs framed the company’s product expansion as an entry into data center power infrastructure, while the commercial microinverter launch advances Enphase’s product roadmap in distributed solar hardware.
What to watch next
- Adoption curve for 800V data center architectures and any signs of early SST deployments.
- Customer uptake and order flow for the IQ9S-3P in the U.S., especially in relation to safe harbor timing.
- Whether Enphase and competitors maintain design advantages that could translate into early market share in the SST opportunity.