Vårgårda is a small Swedish town 70 km north-east of Gothenburg with just over 5,000 inhabitants. Sweden is a trailblazer in climate conservation, and the Vårgårda municipal council is likewise taking innovative action to reduce its dependence on fossil fuels. It has launched a public housing project to demonstrate that even municipalities can successfully plan, build and operate living space which is independent of the public power grid.
The project comprises 172 residential units in six buildings. The aim is to make them self-sufficient on heat, hot water and electricity and as energy-efficient as possible right from the start. At the same time, they should provide comfortable living spaces with modern architecture. Together with the Swedish off-grid experts Nilsson Energy AB, the municipality therefore planned to use hydrogen as an efficient source of energy.
Hydrogen is particularly well suited to countries at high latitudes, where photovoltaic installations yield very little energy in the winter months due to the low angle of incidence of the sun. In the summer, hydrogen can be easily produced in an electrolyzer using excess renewable energy and stored in tanks. In the winter, fuel cells can then be used to convert the hydrogen back into electricity for heating in conjunction with heat pumps
The annual consumption of one of the project’s buildings is 35,000 kWh. That includes lighting, lifts, ventilation, hot water production, and heating. In the winter, the project will use a 5 kW fuel cell, but this will only cover the baseload. For higher peak loads, and to enable the use of solar power during summer nights, the houses need storage for electrical energy.
Requirements for a storage solution:
Nilsson Energy AB was responsible for electrification with the hydrogen cycle. Technical Director Hans-Olof Nilsson persuaded the municipal council to opt for TESVOLT. TESVOLT lithium-ion battery storage systems are designed for safe use over multiple decades in industrial applications. Nilsson Energy AB is fitting each of the six buildings with a TS 48 V which provides an energy content of 187 kWh and a capacity of 54 kW.
• Saving money on heating and electricity costs thanks to the increase in self- consumption
• Reliable and durable
The system boasts an above-average service life of up to 30 years thanks to highly robust Samsung battery cells and the unique battery management system, which optimizes cells not only within a single module but also between the modules in each cabinet.
TESVOLT systems can be expanded or exchanged at any time – not just after the first few months of operation, but even many years later.
• High-performing and fast-reacting
Thanks to the battery management system, TESVOLT’s storage systems make their energy fully available. TESVOLT storage systems are 1C-capable, meaning they can be completely charged or discharged within an hour with the proper configuration. This enables them to run even powerful equipment when the sun or fuel cells can’t provide enough energy alone.
We run a full charging cycle every day in the housing blocks. So we’re very happy to have found TESVOLT’s storage systems, which can handle this level of operation for decades and provide outstanding performance.
Hans-Olof Nilsson, Technical Director at Nilsson Energy AB
It feels good to be able to offer residents sustainable long-term prospects that result in 100% fossil-free energy. Even our fire safety officers were very pleased with the safety of TESVOLT’s storage systems.
Jan Thorsson, CEO Vårgårda Bostäder AB, municipal operating company