Why We Invested
Why we invested in Inmox: predicting gearbox failures before they happen
Part of our Why We Invested series, where the Noctua Science Ventures team shares the reasoning behind our newest portfolio bets.
Every year, more than one in five wind turbines in Europe suffers a gearbox failure — and a single incident can cost up to €1.2 million once you factor in the crane, the downtime, and the replacement part. Multiply that across roughly 100,000 turbines in the EU and US alone, and you get an industry spending over €1 billion annually just trying to keep gearboxes turning. Zoom out further to heavy-duty vehicles, marine, and manufacturing, and the addressable maintenance spend on gearbox-driven systems approaches €8 billion.
That is the problem Inmox, a Vienna-based TU Wien spin-off, has spent the last five years quietly solving. We're excited to share that Noctua Science Ventures has led the pre-seed round, and here's why.
The investment thesis
Inmox was founded in 2021 by CEO Michael Aufreiter (mechanical engineering) and CTO Daniel Kagerbauer (technical physics, TU Wien), and it came to us the way our best deals often do: through the TU Wien ecosystem, where the team is well known and respected. Three things convinced us to underwrite this bet.
A genuinely differentiated hardware-software combination
Most predictive maintenance solutions on the market today lean on vibration monitoring or simple particle counters — both of which require heavy manual analysis and tend to fail under the rough, variable conditions typical of wind, marine, or off-road environments. Inmox instead places an intelligent sensor directly in the lubrication circuit, tracking the smallest wear particles in real time and feeding them into an AI model that estimates each component's Remaining Useful Life. The result: operators move from fixed maintenance intervals to on-demand maintenance, cutting maintenance costs by up to 40% while improving operational safety.
A technically excellent, stubbornly resilient team
Building hardware for oil-cooled gearboxes on a shoestring budget while operating at the brink of insolvency for years is not a comfortable place to build a company — yet Inmox has used that constraint to force real product-market discipline. The engineering is strong enough that it has already earned paid pilots with wind OEMs like VESTAS and major renewable operators including EnergieKontor AG, ContourGlobal, and Verbund AG. Like most deep-tech founder teams at this stage, Inmox is stronger on the technical side than on commercial execution — exactly the kind of gap our portfolio support model is built to help close.
A structural, not cyclical, market tailwind
European wind operators are actively moving away from expensive, full-service OEM maintenance contracts toward self-maintenance as their fleets age past the initial 10–15 year OEM service window. That shift realigns incentives directly in Inmox's favor: an asset owner managing its own maintenance budget has every reason to invest in a system that tells it exactly when a gearbox actually needs attention, rather than servicing on a calendar.
Market size: a big wedge, with room to expand
Our sizing here is deliberately bottom-up. Wind energy alone represents roughly €1.3 billion in addressable maintenance spend across Europe and the US. But gearboxes are everywhere — heavy-duty vehicles alone add another €6.4 billion in market potential, and further expansion into aviation and shipping is a realistic mid-term path once Inmox has proven the model in its wind energy beachhead. That land-and-expand trajectory — entering through a painful, well-defined niche before generalising the sensor and analytics stack — is a pattern we've seen work repeatedly in industrial deep tech.
Eight pilot installations are already live, with four projects committed to further deployment and around 30 additional conversations underway — one German wind farm operator alone has indicated a path to over €750,000 in annual recurring revenue.
Early commercial signals back this up: eight pilot installations are already live, generating roughly €100,000 in revenue, with four projects already committed to further deployment and around 30 additional conversations underway. One reference customer, a large German wind farm operator, has indicated a path to over €750,000 in annual recurring revenue if its second pilot succeeds and rolls out across its fleet of 100+ older turbines.
The technological edge
What sets Inmox apart is not just having a sensor — it's the combination of a purpose-built hardware sensor tuned to detect the earliest, smallest wear particles in gearbox oil, paired with a proprietary machine learning model trained to translate that signal into an actionable maintenance recommendation. The company has already achieved TRL 8 (system complete and qualified), with a patent granted in the US and Japan and pending in the EU. Competing approaches — legacy vibration analysis or basic particle counters — simply don't provide the same depth of insight, particularly in harsh offshore or alpine conditions where manual analysis breaks down.
What we're watching
We underwrote this investment with clear eyes on the risks. The single biggest need-to-believe is commercial: Inmox needs to convert its strong pilot pipeline into recurring, contracted revenue — our internal bar is €1 million+ in ARR before the end of 2027 to unlock the next funding round. The European patent is still pending rather than granted, and like any early-stage deep tech company, key-person concentration remains a real consideration as the team scales.
Why this fits Noctua
We're backing Inmox because we believe the predictive maintenance category is finally maturing past "smart sensor" gimmicks into something that delivers measurable, provable savings — and because we've rarely seen a founding team combine this much technical depth with this much resilience. We're proud to support Michael, Daniel, and the rest of the Inmox team as they take oil condition monitoring from wind energy pilots to a genuine industry standard.
Frequently asked questions
What does Inmox do?
Inmox is a Vienna-based TU Wien spin-off building intelligent oil condition sensors for gearboxes, paired with an AI model that estimates each component's Remaining Useful Life — shifting operators from fixed maintenance schedules to on-demand, predictive maintenance.
What market is Inmox targeting?
The beachhead is predictive maintenance for wind turbine gearboxes, an addressable maintenance spend of roughly €1.3 billion across Europe and the US, with a clear expansion path into heavy-duty vehicles (€6.4 billion) and, longer term, marine and aviation — an €8 billion total addressable opportunity.
Why did Noctua Science Ventures invest?
We invested because Inmox combines a genuinely differentiated hardware-software approach to condition monitoring, an already-earned base of paid pilots with major OEMs and operators, and a structural shift in how European wind operators approach maintenance — addressing a multi-billion-euro problem with a technically excellent, resilient founding team.
Who are Inmox's customers?
Wind OEMs and operators, including paid pilots with VESTAS, EnergieKontor AG, ContourGlobal, and Verbund AG, with eight live pilot installations and around 30 further conversations underway.