Negative current reading on SBM—does sign indicate direction or measurement error?

The discussion centers on interpreting negative current readings displayed on an SBM device used for monitoring current and voltage in a DC battery management system, specifically related to UPS (Uninterruptible Power Supply) equipment. The negative sign on the current reading is not a measurement error but indicates the direction of current flow relative to the meter's polarity. In battery systems, a positive current reading typically signifies battery charging, while a negative reading indicates battery discharging. This directional information is significant for monitoring battery status and troubleshooting. The SBM acronym was clarified as Superior Battery Management, a system integrated into UPS equipment. Participants emphasized the importance of recording the sign of current readings for accurate historical data and future diagnostics. A referenced manual from GE Digital Energy confirms that negative current values correspond to battery discharge. The discussion also highlighted the internal nature of the measurement connections and the relevance of polarity in interpreting current direction.
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