Finnish company Vensum Power has raised €9m to take its software-defined converters into mass production, targeting EV charging, battery storage and DC microgrids before a planned move into AI data centres.
Vensum Power has raised a €9m Series A to cut power conversion losses in charging, storage and data centres. Lifeline Ventures, Larsen & Toubro Group and Eviny Ventures co-led the round. As a result, the Finnish company has now raised €15.2m in total.
The money moves Vensum from technology development to industrial-scale production, according to chief executive Peter Nisula. The company plans to start mass production of its platform in 2027. It also wants to extend the technology into AI data centres.
Where the electricity goes
Almost every modern power system converts electricity between voltages, or between alternating and direct current. Batteries, chargers and server racks all need that step, and each conversion wastes some energy as heat. So small gains in efficiency can add up across a large installation.
Vensum raised its €3.8m seed round in 2023. At the time, it said it could reduce power conversion losses from 7 to 10 per cent to 3 to 5 per cent. The company’s recent announcement gives no updated figures. Those numbers are therefore an older company claim, and CSN hasn’t seen independent test results.
At that time, the Espoo company’s first product was a 25 kW isolated DC-DC converter. It used proprietary soft-switching methods to limit switching losses, and software controlled its operation. Soft switching times each transition so that the transistors change state with little voltage or current across them, which reduces the heat they shed. Details of the current platform’s power rating aren’t yet available in public.
Software that follows the load
Vensum describes its platform as software-defined. Its controls adjust how the converter runs as conditions change, which is where the company says it has its edge. Conventional converters tend to reach peak efficiency only within a narrow operating range, so a swinging load can cost them energy.
Nisula said: “Thanks to the software-defined approach, our converters operate consistently at extremely high efficiency even with rapidly changing loads.” That claim is central to the case for AI data centres, where demand can shift quickly as workloads start and stop. It also applies to EV chargers, which see sharp swings as vehicles connect and disconnect.
He also framed the data centre problem as one of delivery. “The question in data centres is no longer only how powerful the chips are,” he said, “but how efficiently the used electricity actually reaches them.”
From charging to data centres
The company’s core markets are EV charging, energy storage systems and DC microgrids. All three move power between batteries, grids and loads, so they rely heavily on converters. Vensum has also named solar, wind and testbeds as applications in earlier descriptions of its technology.
Data centres add a second reason for interest, because power supply has become a limit on new capacity. Operators are looking at options such as off-grid data centre power and sodium-ion storage. Vensum’s pitch is different in kind, since it tries to get more computing from the capacity that an operator already has. New generation and storage add supply, whereas better conversion reduces the energy lost on the way to the chip.
Investors with an industrial link
Lifeline Ventures also led the seed round in 2023, when Grid.vc and Harjavalta took part. Business Finland provided a €1.7m loan and €400,000 in deep tech funding at the same time. Larsen & Toubro, the Indian engineering group, and Eviny Ventures now join it at the head of this round.
The 2027 production date gives Vensum a clear test. Until then, the company has yet to publish current efficiency figures or name customers. Buyers will want both before they design a new converter into their products. Power conversion losses are easy to measure, so independent results should settle the claim quickly.
