Lastausgang beim MPPT 100/20 per Node-Red steuern

[HPHeuer (Jörg Heuer)]

Trotz KI-Hilfe komme ich nicht darauf, wie man den Lastausgang eines MPPT 100/20 von Node-Red aus steuern kann. Status auslesen und dort anzeigen über den Load/State Parameter ist kein Problem. Aber man müsste doch bei den Einstellungen im VictronConnect beim Lastausgang einen Betriebsmodus “Manuell” einstellen. Nur dann könnte man über Node-Red steuern.

Diese Option gibt es aber nicht, und alle anderen Einstellungen (auch “immer an” und “immer aus”) habe ich schon probiert; Mein Node-Red Lastausgang-Ein/Aussschalter hat keine Wirkung.

[silv_van_alpin]

Hallo zusammen
Ich habe das selbe Problem, in den Einstellungen gibt es kein “Manuell”.
Bist du da irgendwie ein Schritt weitergekommen?

Grüsse Silvan

[UpCycleElectric (Jan)]

I encountered something similar with a BMV Smartshunt relay: I first needed to switch to manual, then switch the relay. And visa versa. See here for the use case and flow:

Venus OS v3.70~41 available for public testing

Yes this is quite interesting indeed. As an example I created the following setup: A BMV Smartshunt as Battery Monitor for the Boardnet Battery (wired to a Multiplus II) The BMV relay set to ‘Charger mode’ (3 sets of 4 x 12V 250Ah GEL Lead-acid batteries) A flow that switches the Multiplus II (ESS) between ‘keep batteries charged’ and ‘external control’ (passthrough) WHEN the BMV turns its (charger mode) relay on and off (no wiring, just by reading and parsing in Node-RED) A virtual ‘Three-st…

[HPHeuer (Jörg Heuer)]

Die Lösung kam über KI-Hilfe: bezüglich meiner Konfiguration habe ich eine Befehlssequenz über den VE-Direct-Bus (bei mir USB) von der KI erhalten, mit der ich direkt den MPPT in den gewünschten Modus steuern konnte. Das VE-Direct-Bus Protokoll für den MPPT ist sicher irgendwo dokumentiert, aber mit KI-Hilfe ging das sehr schnell, nachdem ich der KI meine Konfiguration mitgeteilt hatte.

[UpCycleElectric (Jan)]

AI can work wonders as long as you can verify what works and what is hallucination.
Anyway, would be nice if you would share the solution as well, not only flag as solved for yourself

[HPHeuer (Jörg Heuer)]

This is no big secret, and the solution depends on your configuration. For example (directed by AI) I used an node-red exec-node with the command:

echo -e “:8ABED0000B5\r” > /dev/ttyUSB2

This command turned the MPPT Load output off. The Load output on command was:

echo -e “:8ABED0004B1\r” > /dev/ttyUSB2

I agree that AI is sometimes totally wrong, but this time I verified that the AI was right: it worked.

You can also get every command sequence for other MPPT-Settings you can do with VictronConnect.

Hope this helps with your problem. AI knows all of Victron, but you have to discuss, specify and verify in communictions with the AI. I have used Gemini.

[UpCycleElectric (Jan)]

Can’t get more basic than a direct write to serial. Are you not using the VenusOS large Node-RED platform and the available node libraries at all?

[HPHeuer (Jörg Heuer)]

I couldn’t find any Node-RED platform node libraries to control the MPPT load output. I think this is just not implemented yet. So in order to solve my problem I had to go down to the lowest level.

[UpCycleElectric (Jan)]

Ok, but this is still on VenusOS Large or not? Asking out of interest in possible conflict between VenusOS and direct writes to serial.

[HPHeuer (Jörg Heuer)]

Yes, Venus OS Large with NodeRed, standard Victron-System.

[UpCycleElectric (Jan)]

Ok, interesting to see you could still write to the mppt through the serial port even though it was (I presume) at the same time connected to and under control of VenusOS.