This is a fantastic example of different energy storage technologies working together to create the best solution for this microgrid on the Isle of Eigg. Lead acid batteries have been used on this project to store hydroelectric, solar and wind power. Flywheels and ultracapacitors from Hyperion client Skeleton Technologies perform the fast high power duties required which prevent the batteries from having to perform demanding fast charge-discharge cycles. I hope to see many more projects like this with the collaboration of different renewable generation and storage technologies.
“The ultracaps provide ultrafast response to keep the current as smooth as possible in terms of frequency and voltage. After about one second the flywheel takes over and then it is the lead-acid battery array that supplies current to the grid,” Skeleton Technologies spokesman Olivier Chabilan told Energy-Storage.news today.