I have a similar set up with a Z-wave clamp style current meter[0]. This meter is calibrated to 120v. I use NUT to grab the line voltage off the UPS and adjust

I have a similar set up with a Z-wave clamp style current meter[0]. This meter is calibrated to 120v. I use NUT to grab the line voltage off the UPS and adjust the reported current with actual voltage to get power. It's good enough for the girls I go out with [0] https://www.amazon.com/Aeon-Labs-AEDSB09104ZWUS-Aeotec-Monitor/dp/B00DIBSKFU https://www.amazon.com/Aeon-Labs-AEDSB09104ZWUS-Aeotec-Monit...