BMS Temperatur Zwischenspeichern?

Bock.auf.Raus · January 11, 2023, 7:14pm

Moin,

ich baue gerade meine Liontron Batterien zur Arctic Version um, sprich eine Heizfolie welche übers Relaisboard gesteuert wird. Die Temperatur dafür nehme ich aus dem BMS. Nun schaltet meine Steuerung immer sporadisch mal das Reais an obwohl die eingestellte min. Temp unter der tatsächlichen Temp ist.
Ich denke das kommt daher weil das Bluetooth ab uns an mal kurz abbricht.

Meine Idee ist nun die Temperatur erstmal zwischenzuspeichern und diese dann von der Zwischenspeicherung auslesen. Das Reinschreiben in diesen Speicher könnte man dann ja im 2min Tackt machen. Aber wie mache ich sowas?

Anbei noch zwei Fotos wie das ganze aussieht, für den Boiler und den Wassertank funktioniert das ganze perfekt, da kommt die Temperatur von den “normalen” Temperatursensoren.

Beste Grüße
Sven

range4200t · January 11, 2023, 9:07pm

Hi Sven, genau das möchte ich auch integrieren + einen Abwasser Frostschutz.
Sieht super bei dir aus!!!
Kannst du mir dein Flow exportieren oder zumindest eine JSON Datei geben?
Vielleicht können wir hieran zusammen arbeiten ?
Gruß, Stefan

Bock.auf.Raus · January 12, 2023, 9:49am

Moin,

ich füge dir mal den Flow hier ein, ist ja vielleicht auch für den ein oder anderen interessant.
Wenn jemand was sieht was man besser machen kann immer raus damit, ich hab das Ding nur zusammen gestammelt

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range4200t · January 12, 2023, 10:55am

Hi Sven, teste ich.
Hast du auch etwas mit Luftfeuchte und Lüftung gemacht?

Bock.auf.Raus · January 12, 2023, 11:05am

Ne, da ich nen Aufstelldach habe hab ich damit keine Probleme

ChrisF · January 12, 2023, 11:07am

Wäre aber interessant. Wenn die Luftfeuchtigkeit zu hoch ist, dass der maxxfan z.b. startet?

Bock.auf.Raus · January 12, 2023, 11:40am

Klar wenn man einen Maxxfan hat

Vincent · January 12, 2023, 1:57pm

Also wenn in der “BMStemp” Variable etwas drinsteht, was keine Zahl oder null ist, dann ergibt

else if(temp <= (min))

→ false, heißt die Kondition tritt nicht ein und der Code wird nicht ausgeführt. Mit dem return msg wird aber das “true” aus dem Switch “ON/OFF Batterie” weitergegeben.

Du könntest überprüfen, ob das was aus dem BMS kommt tatsächlich eine Zahl ist, also zum Beispiel

global.set("BMStemp_2", "hallo") // bms temp example, nicht vergessen zu löschen für Praxistest!

if (isNaN(parseInt(global.get("BMStemp_2"))) == false) /* => IS a number*/ {
    global.set("valid_BMStemp_2", global.get("BMStemp_2"))
    msg.payload = global.get("valid_BMStemp_2")
}
else {
    global.set("valid_BMStemp_2", 30)
    msg.payload = "invalid value"
}
return msg

Im ersten if-Block wird die BMStemp variable in einen Integer gewandelt, dann wird überprüft ob es eine Zahl ist. Also wenn isNaN ( = is Not a Number) falsch ist, heißt das im Umkehrschluss, dass es eine Nummer ist. Klingt verwirrend, ist es auch irgendwie

Wenn wir eine Nummer haben setzen wir eine neue Variable valid_BMStemp mit dem Temperatur Wert.

Wenn wir keine Nummer haben, also isNaN == true ist, dann setzen wir valid_BMStemp auf 30, sodass die Abfrage in der “check hysteresis” Node immer false ergibt und das Relay damit nicht angeht.

In “check hysteresis” muss natürlich dann noch die neue Variable validBMStemp anstatt der alten abgefragt werden.

Hab das mal kurz in der Theorie angetestet, vielleicht machst du mal einen Praxistest damit und teilst uns dein Ergebnis mit

EDIT: Die jeweils untere “check hysteresis” function könnte man eigentlich weglassen wenn ich das richtig sehe, oder? Weil es wird ja in jedem Fall ein false weitergegeben.

range4200t · January 12, 2023, 5:48pm

Hallo zusammen, ich habe die Änderung von Vincent ausprobiert. Sie funktioniert. Der Switch und die zweite hysterese function wird nicht benötigt.

Bock.auf.Raus · January 12, 2023, 7:44pm

Im Ausgeschalteten zustand funktioniert es, auch die zweite Hysterie konnte wie von @Vincent gesagt raus.
AAAABEBBERRR, nun geht es aus, wenn es eigentlich eingeschaltet sein sollte.
Sprich min Temp ist unterschritten, Relais geht an, dann kommt ein Verbindungsabbruch und dann geht das Relais kurz aus. Irgendwie wäre es coolwenn man die vorher letzte Temp Zwischenspeichern könnte und so die Verbindungsabbrüche rausgefiltert werden.
Aber Programiertechnisch bin ich echt umkreativ.

range4200t · January 12, 2023, 8:46pm

Ich kann dies bei mir nicht feststellen.
Habe testweise mal anstatt der BMStemp einen Tempsensor verwendete, geht .

Bock.auf.Raus · January 12, 2023, 8:50pm

Bei einem normalen Tempsensor tritt es ja auch nicht auf, was hast du denn für eine Batterie?

Vincent · January 13, 2023, 10:18am

Was steht denn in der Variable BMStemp wenn ein Verbindungsabbruch auftritt?

Bock.auf.Raus · January 13, 2023, 12:08pm

Laut Debug einfach ein undefined

Vincent · January 13, 2023, 12:28pm

Habs nochmal umgeschrieben:

if (isNaN(Number(global.get("BMStemp_2"))) == true) /* => is NOT a number*/ {
    return null
}
else {
    global.set("valid_BMStemp_2", Number(global.get("BMStemp_2")))
    msg.payload = global.get("valid_BMStemp_2")
    return msg
}

Wenn es keine Nummer ist brechen wir die Funktion mit “return null” an der Stelle einfach ab und übergeben nichts an die Variable, es bleibt also der alte Wert drin stehen und es passiert nichts weiter.

Wenn wir eine Nummer haben, dann schreiben wir den neuen Wert in die Variable und geben das ganze weiter an die nächste Node

Bock.auf.Raus · January 13, 2023, 10:26pm

Supi, ds wars also nach ersten Tests funktioniert es so vielen Dank :-*

range4200t · January 16, 2023, 8:11pm

Vincent:

if (isNaN(Number(global.get("BMStemp_2"))) == true) /* => is NOT a number*/ {
    return null
}
else {
    global.set("valid_BMStemp_2", Number(global.get("BMStemp_2")))
    msg.payload = global.get("valid_BMStemp_2")
    return msg
}

@Bock.auf.Raus Ich habe ein JDB BMS

terdt · January 16, 2023, 9:05pm

@Bock.auf.Raus , liest du das JBD BMS auch über den Liontron Flow aus oder verwendest du eine andere Lösung ? Viele Grüße Thomas

Bock.auf.Raus · January 16, 2023, 9:29pm

Ich habe da nix geändert, ich habe im VanPi einfach die LIONTRON im Bluetooth ausgewählt.

range4200t · January 17, 2023, 6:40am

Och verwende deinen Flow, aber mit der Temperatur „BMS_temp“ . Du verwendest „BMS_temp2“