PM Mini and low energy usage?

[MvW]

Hi, I have a couple of questions related to the PM Mini gen3.

First some context. I have a pressure tank for household water, served by a three-phase 240V pump, and installed a PM Mini to measure one phase of the pump. I have two use cases for this: (1) to record the energy usage in Home Assistant and (2) to recognize leaks.

When the pump is on, the PM Mini records 277.7 W on one phase. Meanwhile the 3EM Pro that covers the whole house increases by ~830 W. The 3EM "baseline" is fluctuating a bit so the precision is suffering there, but 3*277.7 = 833.1 and that's good enough for me. It takes at least 5 seconds to refill the pressure tank after the faucet is closed.

Question 1: The house is occasionally empty for a few days and I was expecting the PM Mini to record non-zero values due to leaks in the water pipes. However, it reports a flat zero line. Is it possible for the PM Mini to miss a 5 s pulse of approx. 278 W (0.38 Wh per pulse)? Or is it possible that such pulses are recorded, but then rounded away in the statistics? (The simple answer would be that the system is literally watertight, which would be nice.)

Question 2: Is there a way of recalibrating the PM Mini to return 3x the measured value? I have created a helper function for this in Home Assistant, but I I'd like to move the calculation down to the source. I could reflash the device, but then I would lose the Shelly cloud integration.

Thanks in advance?

Cheers,
--Martin

Edited September 12 by MvW
Explicitly mention the returned data

[Dreckfresse]

Zu deiner ersten Frage:

Du hast doch Homeassistant, also schau dir doch mal dort den Power Sensor an wenn deine Pumpe an/aus ist

er sollte also sofort ausschlagen