The storage of energy generated by solar power plants for personal consumption instead of feeding it into the public electricity network is growing more and more popular due to reduced feed-in tariffs and more efficient storage technology. One of the trailblazers in this fast-evolving market is actensys GmbH. Already offering smaller-scale storage systems for private homes, the photovoltaic pioneer from southern Germany is now pressing ahead with higher-capacity solutions for commercial and industrial customers – because the sun does not send an invoice.