Between May 2013 and January 2016, 34,000 solar storage systems with a combined capacity of more than 200MW were grid-connected, according to a report by the RWTH Aachen University and the iSEA institute, for power converter technology and electrical drives, with funding by the German government, which supports solar storage investments via its KfW development bank.

"Solar storage systems within the shortest time have developed from a partially hand-made niche product into a mass market," the report says, adding that the KfW support has a positive impact on the entire market.

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