Strange power factor registered with e Shelly EM

[tom_l]

Negative power factor with Shelly EM

Power Factor sign is subject to standard used, that is either the IEEE or IEC standards. A comparison of the 2 standards is presented: https://www.se.com/ww/en/faqs/FA212521/ PF sign convention: IEC PF sign correlates with the direction of real power (kW) flow. Quadrant 1 and 4: Positive real power (+kW), the PF sign is positive (+). Quadrant 2 and 3: Negative real power (-kW), the PF sign is negative (-). PF sign convention: IEEE PF sign is correlates with the PF lead/lag convention, in…