Es gibt wahrscheinlich deutlich einfachere Lösungen… aber es funktioniert 
Der Zahlenwert von PacArr (aktueller Verbrauch) aus der Datei min_cur.js wird ausgegeben.
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Und hier noch der Flow für das Auslesen des Tagesgesamtverbrauches aus der days.js
[{"id":"7aec4a2b.f4aaf4","type":"http request","z":"47ffde65.d8b548","name":"","method":"GET","ret":"txt","url":"http://192.168.100.150/days.js","x":382,"y":1130,"wires":[["330d8bc8.57cf9c"]]},{"id":"53022e08.fef72","type":"debug","z":"47ffde65.d8b548","name":"","active":true,"console":"false","complete":"payload","x":1066,"y":1448,"wires":[]},{"id":"49123c17.c1f774","type":"inject","z":"47ffde65.d8b548","name":"","topic":"","payload":"","payloadType":"none","repeat":"","crontab":"","once":false,"x":238,"y":1130,"wires":[["7aec4a2b.f4aaf4"]]},{"id":"44b29e7c.6300d8","type":"splitter","z":"47ffde65.d8b548","name":"","property":"payload","x":777,"y":1131,"wires":[["8acb8b2f.336ad"]]},{"id":"361cafaa.503ba","type":"splitter","z":"47ffde65.d8b548","name":"","property":"payload","x":780,"y":1243,"wires":[["19ebd8d4.67e28f"]]},{"id":"330d8bc8.57cf9c","type":"string-split","z":"47ffde65.d8b548","name":"","source_object":"msg","source_property":"","target_object":"msg","target_property":"","split_on":"da[dx++]","x":597,"y":1127,"wires":[["44b29e7c.6300d8"]]},{"id":"8acb8b2f.336ad","type":"string-split","z":"47ffde65.d8b548","name":"","source_object":"msg","source_property":"","target_object":"msg","target_property":"","split_on":";","x":590,"y":1246,"wires":[["361cafaa.503ba"]]},{"id":"19ebd8d4.67e28f","type":"switch","z":"47ffde65.d8b548","name":"","property":"payload","rules":[{"t":"cont","v":"="}],"checkall":"false","outputs":1,"x":377,"y":1346,"wires":[["70bf053c.4aac54"]]},{"id":"2e7c78ff.16c058","type":"switch","z":"47ffde65.d8b548","name":"","property":"payload","rules":[{"t":"cont","v":"="},{"t":"else"}],"checkall":"true","outputs":2,"x":377,"y":1451,"wires":[[],["53022e08.fef72"]]},{"id":"70bf053c.4aac54","type":"string-split","z":"47ffde65.d8b548","name":"","source_object":"msg","source_property":"","target_object":"msg","target_property":"","split_on":"|","x":584,"y":1346,"wires":[["27f1be91.f77002"]]},{"id":"27f1be91.f77002","type":"splitter","z":"47ffde65.d8b548","name":"","property":"payload","x":777,"y":1348,"wires":[["2e7c78ff.16c058"]]}]
Damit das ganze funktioniert müssen noch folgende Node-Red Pakete installiert werden:
npm install node-red-contrib-splitter
npm install node-red-contrib-primitives
npm install node-red-contrib-json