Contents
Intro
Sur mon blog domo.rem81.com, je partage mes projets domotiques pour rendre ma maison plus intelligente et économe. Aujourd’hui, je vous présente un flow Node-RED que j’ai conçu pour collecter et traiter les données de mon système solaire Victron Energy, composé d’un MultiPlus-II (MP2), d’un contrôleur MPPT, et d’un Cerbox GX dans lequel j’ai activé « Node Red ». Ce flow est la première partie d’un système plus large qui me permet de surveiller et d’automatiser ma production et ma consommation d’énergie.
Objectif du flow
Ce flow, nommé « Communs », est la base de mon système de monitoring. Il récupère des données clés de mon installation Victron, comme la puissance PV, la consommation, l’état de charge, et l’état du réseau, puis les publie via MQTT pour une intégration avec Home Assistant. Ces données me permettent de suivre en temps réel la performance de mon système solaire et de préparer des automatisations (que je détaillerai dans un prochain article).
Le flow Node-RED
Code json
Vous pouvez copier/coller le fichier .json en Annexe
Visualisation du flowAccueil
Voici une capture d’écran de mon flow « Communs » dans Node-RED, où vous pouvez voir la disposition des nœuds et le flux des données entre eux :
Cette capture montre les différents sous-flux, comme la collecte de la puissance PV (nœuds victron-input-solarcharger), l’état du VE.Bus (nœuds victron-input-vebus), et les publications MQTT (nœuds mqtt out). Les nœuds debug sont également visibles pour le suivi des données en temps réel.
Analyse du flow
- Puissance du réseau (Grid L1) :
- Un nœud
victron-input-gridmeterrécupère la puissance sur la phase L1 (/Ac/L1/Power) depuis le servicecom.victronenergy.grid/31. - La valeur est publiée sur le topic
mp2/multiplus2/grid_l1_acvia deux brokers MQTT (un pour Home Assistant à192.168.0.37:1883, un autre pour un serveur Proxmox à192.168.0.204:1883). - Un nœud
debugaffiche la valeur pour le suivi.
- Puissance PV totale :
- Deux nœuds collectent la puissance PV :
PV MPPT1: Puissance du contrôleur MPPT (/Yield/Powersurcom.victronenergy.solarcharger/279).PV MO: Puissance PV couplée AC (/Ac/PvOnGrid/L1/Powersurcom.victronenergy.system/0).
- Les valeurs sont stockées dans des variables de flux (
mppt1etpvmo), additionnées via un nœudfunction, et publiées sur le topicmp2/multiplus2/prod_totale.
- État du VE.Bus et de charge :
- Un nœud récupère l’état du VE.Bus (
/State) du MultiPlus-II, le convertit en texte lisible (ex. « Inverting ») via un nœudfunction, et le publie surmp2/multiplus2/etatbusve. - Un autre nœud récupère l’état de charge (
/VebusChargeState) et le publie surmp2/multiplus2/etatcharge.
- Autres métriques :
- SOC minimum (
/Settings/CGwacs/BatteryLife/MinimumSocLimit) publié surmp2/multiplus2/soc_mini. - État du réseau (
/Alarms/GridLost) publié surmp2/multiplus2/grid_lost. - Mode de fonctionnement (
/Mode) publié surmp2/multiplus2/mode.
Détails techniques
- Nœud
functionpour l’état VE.Bus : Le script JavaScript suivant convertit les codes d’état en texte :
var code=msg.payload;
// Tableau à deux colonnes
var tableau = [
[0, 'Off'],
[1, 'Low Power'],
[2, 'Fault'],
[3, 'Bulk'],
[4, 'Absorption'],
[5, 'Float'],
[6, 'Storage'],
[7, 'Equalize'],
[8, 'Passthru'],
[9, 'Inverting'],
[10, 'Power assist'],
[11, 'Power supply'],
[255, 'External controle'],
];
// Fonction pour extraire la deuxième colonne en fonction de la première colonne
function extraireDeuxiemeColonne(valeur) {
for (var i = 0; i < tableau.length; i++) {
if (tableau[i][0] === valeur) {
return tableau[i][1];
}
}
return "Etat Inconnu"; // Retourne null si aucune correspondance trouvée
}
// Exemple d'utilisation
var valeurRecherchee = code;
var resultat = extraireDeuxiemeColonne(valeurRecherchee);
msg.payload = resultat;
return [msg]- Brokers MQTT : Deux brokers sont utilisés pour assurer une redondance et une intégration avec différents systèmes (Home Assistant et Proxmox).
Intégration avec Home Assistant
Ce flow envoie toutes les données via MQTT à Home Assistant (broker à 192.168.0.37:1883). Par exemple, le topic mp2/multiplus2/prod_totale me permet de suivre la production totale de mes panneaux solaires dans un tableau de bord. Ces données sont également envoyées à un serveur Proxmox pour un monitoring secondaire.
Pourquoi Node-RED ?
- Simplicité : Je peux collecter et traiter des données complexes sans écrire de code complexe.
- Flexibilité : Les nœuds Victron s’intègrent parfaitement avec MQTT et Home Assistant.
- Visuel : L’interface de Node-RED me permet de voir clairement le flux des données.
Palettes Utilisées
Pour reproduire ce flow, vous aurez besoin d’installer les palettes suivantes dans Node-RED :
- node-red-contrib-victron : Fournit les nœuds pour interagir avec les systèmes Victron Energy (comme
victron-input-solarcharger,victron-input-vebus, etc.). Installez-la via le gestionnaire de palettes de Node-RED ou avec la commande :
npm install node-red-contrib-victron- node-red-node-mqtt : Fournit les nœuds MQTT (
mqtt out,mqtt-broker). Cette palette est généralement incluse par défaut dans Node-RED, mais si elle est absente, vous pouvez l’installer avec :
npm install node-red-node-mqtt- Nœuds de base (Core) : Les nœuds comme
debug,function,change, etcommentsont inclus par défaut dans Node-RED.
Note : Assurez-vous que votre instance Node-RED a accès à votre système Victron (via DBus ou MQTT, selon votre configuration) pour que les nœuds Victron fonctionnent correctement.
Conclusion
Ce flow « Communs » est la première brique de mon système de gestion d’énergie solaire avec Victron Energy. Il me fournit des données fiables pour surveiller ma production et ma consommation, tout en préparant le terrain pour des automatisations plus avancées (que je partagerai dans un prochain article). Si vous avez un système Victron ou utilisez Node-RED, ce projet pourrait vous inspirer. Des questions ou des idées ? Laissez un commentaire sur domo.rem81.com !
Annexe: Fichier JSON
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"finalize": "",
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"active": true,
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"statusVal": "payload",
"statusType": "auto",
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"wires": []
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{
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"type": "victron-input-vebus",
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"name": "MP2"
},
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"enum": {
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"1": "Low Power",
"2": "Fault",
"3": "Bulk",
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"5": "Float",
"6": "Storage",
"7": "Equalize",
"8": "Passthru",
"9": "Inverting",
"10": "Power assist",
"11": "Power supply",
"252": "External control"
}
},
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"name": "Etat Bus VE",
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"type": "mqtt out",
"z": "dbd727f16cbe7b5f",
"name": "Etat Bus VE",
"topic": "mp2/multiplus2/etatbusve",
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"retain": "",
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"contentType": "",
"userProps": "",
"correl": "",
"expiry": "",
"broker": "a89b02435258ed38",
"x": 410,
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},
{
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{
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{
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{
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{
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},
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{
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]Pour que la capture d’écran soit la plus utile possible pour vos lecteurs, voici quelques conseils :
- Zoom et lisibilité : Assurez-vous que les noms des nœuds (comme « PV MPPT1 », « Pu Grid », etc.) sont lisibles. Vous pouvez zoomer légèrement dans Node-RED avant de prendre la capture.
- Organisation : Si le flow est très étendu, essayez de le réorganiser pour qu’il tienne dans une seule vue (vous pouvez déplacer les nœuds temporairement pour la capture).
- Annotations : Si possible, ajoutez des annotations (par exemple, avec un outil comme Paint ou GIMP) pour indiquer les sections importantes, comme « Puissance PV », « État VE.Bus », etc.
- Format : Enregistrez l’image en PNG ou JPEG pour une bonne qualité, et hébergez-la sur votre blog ou un service d’hébergement d’images (comme Imgur) pour l’intégrer dans l’article.
