Invinity Energy Systems has sold seven VS3 flow batteries to STS Group for use in a solar plus storage project near the municipality of Öskü, central Hungary. Delivery of the batteries is expected to commence in H2 2023.
Following a reseller agreement with Ideona Group and STS, the project, supported with EU funding, will see the 1.5 MWh battery array coupled with a 2 MWp solar array that will provide power for up to 6 hours. Invinity’s battery will increase the use of renewable energy and provide balancing services for the local grid by storing and dispatching excess solar generation.
Ideona will own and operate the entire project and STS will fully install and integrate the battery. The project was created as part of a government tender issued by the National Research, Development, and Innovation Office in Hungary.

Matt Harper, Chief Commercial Officer at Invinity said: “This achievement reflects the effectiveness of Invinity’s strategy of engaging with strong regional partners to build global demand for our products and emphasises the commercial momentum we expect will be the hallmark of Invinity’s business through the first half of 2023. ”