Even though the start-up costs are slightly higher than for back-up units with batteries, the maintenance costs are much lower as the Spica Back-up Unit does not require any battery changes, and the service life is up to 20 years. In addition, wind turbine owners can be sure that the unit is reliable and always working correctly.
In case of grid failure, the unit supplies the controller and sensors with power so that it can keep collecting data. This makes fault finding easier, because all events causing the emergency stop are stored in the event log.
The Spica Back-up Unit is designed for both new wind turbines and for retrofit.