VZM30-SN Power vs Energy Bug with HA Z2M

Hello,

I wanted to report another potential firmware bug related to the reported energy on a VZM30-SN. I use the switch with HA Z2M. Please see the images below for some sample datasets.

Thank you!

Summary:

  • Switch’s reported energy is off by several orders of magnitude compared to energy as by the reported instantaneous power signal (8.5kWh vs 324Wh in one example below)
  • Switch’s reported energy continues to climb by multiple kWh (3kWh over 4 hours in lower example) despite being at idle power draw for the entire duration
    • I did a crude cross check at my meter and this does not appear to be a real load. I haven’t reopened the wall and measured with my current clamp yet
  • Switch’s reported energy alternates between climbing at a high rate (~500-1000W) or flattens (expected) during a continuous period of idle power draw