During the KIVI seminar ‘Home Batteries: Hype, Hope or A Real Necessity in the Energy Transition’, one question took centre stage: what role will home batteries play in our future energy system? At the HAN@Connectr Innovation Lab in Arnhem, it soon became clear that the answer is less straightforward than is often suggested in advertising.

Henri ter Hofte from the Centre for Sustainable Living kicked off the proceedings with a critical analysis. He examined home batteries from the perspectives of the wallet, peak demand and the planet. His message was clear: a home battery is not necessarily the best solution. Financially, recouping the investment is by no means always guaranteed, whilst the sustainability benefits also depend on how the battery is used. In doing so, he immediately set the tone for an afternoon in which nuance was more important than hasty conclusions.

Twan Vooijs from Sessy then discussed the technology behind home batteries. He demonstrated that lithium-ion remains the dominant technology for the time being, although there are numerous variants and alternatives. He also highlighted a topic that is often overlooked: voltage quality. As more power electronics are connected to the grid, the quality of conversion and control deserves extra attention. The business case was also discussed: a battery does not generate energy, but shifts consumption and storage over time. The value therefore depends heavily on the application, such as utilising one’s own solar power, trading on energy markets or providing flexibility to the grid.

Luuk Wiehink took the step from individual homes to the neighbourhood level. He demonstrated that linked home batteries, provided they are intelligently controlled and connected to the same transformer, can function as a local neighbourhood battery. This not only creates an opportunity to reduce grid peaks, but also establishes a model in which residents collectively benefit from flexibility in the energy system.

A highlight of the afternoon was the guided tour of ElaadNL, led by Marisca Zweistra. There, participants were shown practical set-ups of charging systems, vehicle interfaces and test facilities. It was particularly impressive that new technologies are tested there independently, and that this is done using equipment and vehicles from virtually all car manufacturers. It was precisely this broad and objective approach that underlined how important standardisation, interoperability and reliable real-world data are for the energy transition.

The main conclusion of the seminar was therefore that it is not the battery in itself that makes the difference, but the way in which it is deployed from a technical, economic and systemic perspective. The home battery is thus not a panacea, but it is a significant building block in a smarter energy system.

On behalf of KIVI Engineers & Energy Transition, Gerard Thomas

Download the presentations here