On September 10, SolarEdge Technologies (NASDAQ:SEDG) said the medium-voltage to 800 VDC conversion stage of its data center power system is now running under load in its own labs, with full-path validation underway. Alongside that milestone, the company published a joint white paper with NVIDIA laying out how to protect and ground 800 volt direct current systems inside AI data centers. It’s a shift from talking about a market opportunity to showing engineering work. Whether that work becomes the industry’s answer, or just one contender among several, is the question the rest of this story turns on.
From Lab Bench To Live Load
SolarEdge’s DC powertrain is meant to carry power all the way from the utility to the server rack, and getting the medium-voltage-to-800V stage through lab validation under load is a concrete step past the planning stage. The company paired that hardware progress with the softer work of setting standards. The paper it published with NVIDIA, titled “800 VDC Protection and Grounding for AI Data Centers,” lays out a zone-based protection approach that keeps power flowing in the restricted facility zone while cutting it instantly at the rack interface where people work. NVIDIA frames the paper as technology-neutral and open to any vendor, which gives SolarEdge a seat at the table as the rules for an entirely new category of power infrastructure get written.
That credibility isn’t coming from nowhere. Series arc detection, DC disconnection, and insulation monitoring, the functions underpinning the new framework, have already been running inside SolarEdge’s photovoltaic products for more than a decade. On top of that head start, the core business is healing. On August 5, SolarEdge reported second-quarter revenue of $346.2 million, up 20% year over year, and its sixth straight quarter of margin expansion. Non-GAAP operating income turned positive at $10.2 million, the first profitable quarter on that basis since the second quarter of 2023, and free cash flow came in positive at $3.1 million. Cash and investments, net of debt, grew to $264.6 million. CEO Shuki Nir tied the two threads together directly, saying the company is “continuing to advance the SolarEdge SST to address the significant opportunity in AI factories.”
One Candidate Among Many
SolarEdge draws its own line between what it has proven and what it hasn’t. The company states plainly that the photovoltaic track record behind its protection functions is component precedent, not data center validation, and that the medium-voltage solid-state transformer, DC distribution hardware, and monitoring systems meant for AI facilities are still under development and not yet generally available.
The architecture described in the white paper is also explicitly one candidate implementation rather than a mandated design. NVIDIA says it wants an open, multi-vendor 800 VDC ecosystem and is encouraging multiple conversion topologies, grounding configurations, and protection technologies, meaning high-resistance midpoint grounding, solid-state transformers, and solid-state circuit breakers are options on the table, not requirements SolarEdge alone gets to define.
The financial turnaround has an asterisk too. The GAAP numbers still show red ink: an operating loss of $16.0 million and a net loss of $30.8 million in the second quarter, even as both narrowed sharply from a year earlier. Third-quarter guidance calls for revenue of $310 million to $340 million, a $30 million spread that leaves room for the outcome to land on either side. And growth so far has leaned on Europe and US commercial and industrial demand, offsetting continued softness in US residential, a mix that could shift again.
What The Money Says
Hedge fund ownership of SolarEdge slipped from 38 funds to 36 in the most recent quarter, a mild pullback rather than a rush for the exits. Short interest, though, is heavy at 25.5% of the float, pointing to a large and organized bet against the stock. Against that skepticism sits a forward price-to-earnings ratio of 80, as of September 15, a multiple that already prices in years of the growth story working out. That combination shows that the market hasn’t settled on which version of SolarEdge is the real one.
The Path Still Being Built
SolarEdge has moved its AI data center ambitions from slideware to a working lab result and a framework NVIDIA is willing to co-publish, real progress for a company that spent much of the past two years digging out of losses. But the same announcement makes clear its data center hardware isn’t shipping yet and that its design is only one option among several NVIDIA wants the industry to test. What happens next depends on whether lab validation turns into products that customers actually choose over rival architectures.
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