Renewable energy systems that are designed using a simulation tool or existing renewable energy systems that are measured over a complete year can have detailed information on the battery use. This information can be the current, voltage and/or temperature of the battery in hourly time steps.
If these time series are available it is highly recommended to use the evaluation tool called Thesa , developed by the Fraunhofer Institute for Solar Energy Systems in Freiburg, Germany. Thesa produces the so-called Standard Evaluation Report (SER), which is a comprehensive evaluation report of the way the battery is used. Furthermore Thesa calculates of eight so-called stress factors.

When you have used Thesa please fill in the 8 stress factors to obtain information on the storage device that is specifically for your renewable energy system and its use. If you decided not (yet) to use Thesa, click here for recommendations on conceptually designed RE-systems.