Detecting implausible measured temperature values

The measured values are checked against each other to detect sensor errors or implausible temperatures in the storage bundle. The following figure shows the usual distribution of the temperature in the storage bundle:

Operating principle

The two outer modules in the storage bundle can have a temperature 2 to 3 °C lower as these are cooled to the outside by convection (depending on the installation situation). If a module is defective and measures a significantly lower or higher temperature than the other modules in the storage bundle, for example, this is detected by the StorageMonitor "Temperature Runaway Check" function and reported to the user with a warning. For this purpose, the model of a storage bundle shown in the figure is stored internally, in which the outer modules are cooler than the inner modules.

The behavior of the function can be configured in the configuration of the software module in the "Energy storage" configuration menu in the "Energy storage" submenu in the "Energy storage monitoring" area via the following setting fields:

• Temperature offset of outer modules
• Offset that is added to the two outer modules to increase the temperature for the internal calculation and to adjust it to the others (NOTE: Observe the order of linking on the StorageMonitor. The first and last linked module of a storage bundle (stack ID) is corrected). The default value is 5 °C. If the modules are installed in such a way that no cooling can be expected from the sides, then this offset can be set to 0 °C.
• Maximum temperature difference of energy storage modules
• Maximum permitted temperature deviation of an individual module to the median of the other modules. A warning is displayed above this value. The default value is 10 °C.