The cost of a photovoltaic system in Germany could be quickly refinanced by the high solar feed-in tariff only a few years ago. However – the payment has now decreased. Therefore nowadays it is highly economical to consume the self-generated solar energy by oneself. This makes energy storage solution to the core element of power systems of the future. The meeco group has now developed together with long term partners an all-in-one converter/ inverter with system energy management enabling better insight into power production and use, leading to better management of produced energy and savings.