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RCT Power achieves a top position in the University HTW Berlin's Energy Storage Inspection for the 3rd time

Our storage system consisting of the RCT Power Storage DC 6.0 and the Power Battery 11.5 is with an SPI of 92,6% the front runner in the category System Performance Index SPI (5 kWp). This is the third time in a row that RCT Power has achieved an outstanding result in the annual Energy Storage Inspection of the University HTW Berlin.


The Energy Storage Inspection 2020 is the third study the Solar Storage Systems Research Group of the Berlin University of Applied Sciences (HTW Berlin) has conducted to evaluate the energy efficiency of battery systems for solar power systems. The comparative study was supported by 14 manufacturers providing system measurement data from independent test laboratories. A total of 21 solar power storage systems, including devices from RCT Power, were scrutinised.

RCT Power ranks in the highest efficiency class A with the best SPI (5kWp)

The RCT Power is the top performer in the Energy Storage Inspection 2020 efficiency evaluation. The System Performance Index (SPI), developed at the HTW Berlin, is used to assess the energy efficiency of PV storage systems. The SPI rates the systems based on the energy flows at the grid connection point. The storage system consisting of RCT Power Storage DC 6.0 and Power Battery 11.5 is with a System Performance Index SPI (5 kWp) of 92.6% the frontrunner of the systems evaluated in the comparative study. The results place it at the top and in the highest achievable efficiency class A.

Fast settling times save money and help to protect the climate

RCT Power storage systems consistently show the lowest system control settling times. Minimum response times of 0,4s can be achieved. There are only minimal control losses and adverse energy exchanges between the storage system and the public grid are largely avoided. Very fast response times are important, for example, in order to be able to follow the start-up currents of refrigerators and freezers and to supply energy to them from the storage system as promptly as possible. Slower systems, on the other hand, will initially use more power from the public grid and only later from the storage system. The electricity drawn from the grid adds up over time and is ultimately reflected in a higher electricity bill.

"The energy revolution requires efficient electricity storage systems," stresses Prof. Dr. Volker Quaschning, Professor for Renewable Energy Systems at the HTW Berlin and co-author of the study. Anyone who focuses on high system efficiency when buying storage units will not only subsequently save money, but also help to protect the climate.

The overall assessment of this year's Energy Storage Inspection is positive: An increasing number of technical mature storage systems with high-efficiency ratings are available in the market place. However, deploying an energy storage system in conjunction with a photovoltaic system often faces regulatory disincentives such as the levy on the self-consumed solar power imposed by the Renewable Energy sources Act (EEG). "To enable the increased usage of storage systems to advance the urgently needed expansion of solar energy in Germany, the German government must finally release the handbrake on their climate protection policy," adds Prof. Dr Volker Quaschning.

The Energy Storage Inspection 2020 is part of the project “EffiBat” and is supported with funds from by the German Federal Environmental Foundation (DBU).

The study is available at:

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