A battery energy storage system (BESS, e.g. Tesla Powerwall, Sonnen, BYD) integrated into KNX typically exposes its state of charge (SoC) through DPT 5.001 (0-100 %) and its instantaneous power (charge or discharge) through DPT 14.056 (signed W).
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The standard mapping pattern for a battery on KNX is to expose the SoC as DPT 5.001 (a percentage from 0 to 100 %), the instantaneous power as DPT 14.056 (signed watts, positive when charging and negative when discharging), and the operating mode as DPT 5.010 or a DPT 20.x enumeration covering automatic, force charge, force discharge and backup-only states. This typed exposure allows the visualisation and the logic to implement true multi-source priority: PV self-consumption first, then battery, then grid during the day, and battery discharge into the load during the night or peak tariff hours.
Confirm the sign convention of the power Group Object with the gateway manufacturer — some vendors invert it (positive = discharge), and a wrong sign silently breaks self-consumption logic without any error in ETS.
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