Impossibly high consumption reported sometimes

[peter.suba]

I have a TOMZN 63A circuit breaker with energy monitoring, in the app identified as PSF-B67-GL.

The issues is that it regularly records energy consumption that is just impossibly high - it regularly (but not exclusively) does this in the night hours when actual consumption is actually low.

For example, this is the January consumption log, reporting a sum of 1035 kWh:

For reference, the utility company bills me 219 kWh for the same period - so this is not a small difference.

The corresponding Home Assistant graph with the wattage underneath (daily Energy (top graph) is calculated somewhat different than the eWelink app, but it is generally consistent with the data in the app so good enough for reference):

So what is visible is that there are spikes in the wattage and energy usage reported at times, and I can’t figure out what is causing these spikes that are clearly physically impossible (way over the rating of the device or anything that could consume this much). The Amperage reported do not seem to have the same spikes and is a consistent graph.

Can anyone help figure out what is going on? Is this a faulty device or an app issue?

[john.e.dixon]

Don’t know if this could have anything to do with your problem but I found a similar issue using Tuya outlets for the measurement and bringing this into Smartthings (via Matter from my iHost). The device tile, on opening, shows very low energy as Wh but that came across as kWh in Smartthings. When the energy rises then both are in kWh so that’s OK but the accumulated was distorted.

[peter.suba]

I don’t think that it is about interfacing and interpreting the data - like I mentioned, the eWelink app has very similar numbers.

Further info: I have set up some high wattage alerts now to see if I can catch this spike happening live. Here are some screenshots from the eWelink app live:

You can see clearly these are impossibly high spikes. When this happens, the wattage jumps up and down a lot. This occurrence was when there was a relatively low consumption, then I switched on some lights behind this breaker to see what it would do. The wattage immediately dropped down to around 130 watts and the irregular high wattage reports have stopped. This worked for a few minutes but then suddenly I again had the irregularly high wattage reports.