Homey Energy Dongle: False >90% overload trigger when EV charger stops

Energy
1

Hi everyone,

I’m running into a strange issue with my Homey Energy Dongle and a phase-monitoring flow. Hopefully someone recognizes this.

My setup:

  • Main connection: 3x 25A
  • Measurement: Homey Energy Dongle (P1)
  • EV Charger: Amina charger (charging the car at 3-phase, 16A per phase)

The issue:
I have a flow that warns me of an overload on phase 3:

  • WHEN: Homey Energy Dongle - Load (phase 3) becomes greater than 90% for 30 seconds
  • THEN: Send timeline and push notification

However, this flow keeps triggering at the exact moment the Amina charger finishes charging (when the car stops drawing power). At that same moment, I also get the built-in notification from the Energy Dongle itself: “the load on phase 3 has exceeded 90%”.

What I’ve already tried:

  1. Increased the duration in the WHEN card from 15 to 30 seconds.
  2. Added a Logic card in the AND column: first “Load (phase 3) is greater than 90” and later changed it to “Current (phase 3) is greater than 23”. Even with this check, the notification still triggers.
  3. Checked Homey Insights, but there’s no visible spike on the 24-hour graph (likely averaged out).

It seems like the Energy Dongle registers a brief spike when the charger disconnects, and the value gets “stuck” above the threshold for a bit before the 0A reading comes through.

Does anyone have an idea how to reliably filter out this brief switch-off spike or stuck value in my flow?

Hoi allemaal,

Ik loop tegen een vreemd probleem aan met mijn Homey Energy Dongle en een flow voor fase-bewaking. Hopelijk herkent iemand dit.

Mijn situatie:

  • Hoofdaansluiting: 3x 25A
  • Meting: Homey Energy Dongle (P1)
  • Laadpaal: Amina lader (laadt de auto op 3-fase, 16A per fase)

Het probleem:
Ik heb een flow die me waarschuwt bij overbelasting op fase 3:

  • ALS: Homey Energy Dongle - Belasting (fase 3) wordt meer dan 90% voor 30 seconden
  • DAN: Stuur tijdlijn- en pushmelding

Deze flow gaat echter telkens af op het exacte moment dat de Amina lader klaar is met laden (en de auto dus stopt met stroom vragen). Op datzelfde moment krijg ik ook de ingebouwde melding van de Energy Dongle zelf: “de belasting op fase 3 heeft de 90% overschreden”.

Wat ik al geprobeerd heb:

  1. De tijd in de ALS-kaart verhoogd van 15 naar 30 seconden.
  2. In de EN-kolom een Logic-kaart toegevoegd: eerst “Belasting (fase 3) is groter dan 90” en daarna aangepast naar “Stroom (fase 3) is groter dan 23”. Ook dan blijft de melding komen.
  3. In Homey Insights gekeken, maar op de 24-uurs grafiek is geen piek zichtbaar (waarschijnlijk wordt die korte piek weggemiddeld).

Het lijkt erop dat de Energy Dongle bij het afschakelen van de lader een korte piek registreert en de waarde daarna even blijft “hangen” voordat de 0A-waarde doorkomt.

Heeft iemand een idee hoe ik deze korte uitschakelpiek of hangende waarde betrouwbaar kan wegfilteren in mijn flow?

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2

Perhaps the AI section with posts below this topic might contain useful info:

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Like this one: Energy Dongle Fase 1 boven 90% - #34 by nielsruiter94

3

Hi Erwin,

One thing stands out. Your AND card (“Current (phase 3) > 23”) checks the value at the moment the flow runs, and it still passed. The dongle’s own 90% warning fired too. So I don’t think the value is stuck. The meter really reported more than 23 A on phase 3 for at least 30 seconds. Insights averages it away, so it doesn’t show there. It’s worth checking what the charger and car do in the last minute of a session, and whether something else on phase 3 starts just then.

If you only want to drop the short peaks, the cleanest filter is a delayed recheck. In an Advanced Flow, put a delay of e.g. 60 s after the trigger, then check “Load (phase 3) > 90%” again, and only notify if it’s still true.

This is also where flows get tricky. A warning tells you a phase is full, but then you still have to work out what to turn down, by how much, and when it’s safe to turn it back up. I maintain PELS Energy Manager, which does that part. Enter 3x25 A under Main fuse, and when your meter reports phases, PELS keeps L1, L2 and L3 each under the fuse. It does that by limiting devices on the full phase in your priority order and bringing them back when there’s room. Overview shows the load on each phase, and Usage lists recent phase peaks.

I haven’t tested the Amina charger with PELS yet, but it would be easy to add support if it’s interesting to you.

Good luck, and let me know how it goes.

4

Quick update after manually stopping a charging session to reproduce the issue:

  1. Amina S (Power & Current Phase C): The charger itself shows a steady ~3.6 kW and max 16A, dropping straight to 0 W / 0A when stopped—no spike at all.
  2. Voltage (Phase 3): The voltage stays completely stable around 237–238V (and slightly rises to 239V after disconnecting), with no voltage drop.

So there is definitely no real 31A physical load being drawn. It looks like a brief P1 smart meter calculation/switching artifact when the charger/car disconnects.

At least this confirms my 25A main fuse and charger are completely safe! Now it’s just a matter of filtering out this false spike in Homey.