diff --git a/src/core/reader.js b/src/core/reader.js
index 990e8a2..69c2b7c 100644
--- a/src/core/reader.js
+++ b/src/core/reader.js
@@ -78,9 +78,14 @@ class MPPTReader extends EventEmitter {
     // Istanzia gli MPPT configurati (indicizzati per nome logico)
     this.mppts = new Map();
     for (const config of mppts) {
+      const normalizedAddress = Number(config.address);
+      if (!config.id || !Number.isFinite(normalizedAddress)) {
+        this.log(`[reader] configurazione MPPT ignorata perche' incompleta: ${JSON.stringify(config)}`);
+        continue;
+      }
       const mppt = new MPPT({
         name: config.id,
-        address: config.address,
+        address: normalizedAddress,
         log: this.log,
       });
       this.mppts.set(config.id, mppt);
diff --git a/src/index.js b/src/index.js
index ab6be2a..157616b 100644
--- a/src/index.js
+++ b/src/index.js
@@ -228,14 +228,27 @@ module.exports = function (app) {
   }
 
   function normalizeOptions(options = {}) {
+    const configuredMppts = Array.isArray(options.mppts) && options.mppts.length > 0
+      ? options.mppts
+      : defaultPluginOptions.mppts;
+    const normalizedMppts = configuredMppts.map((configuredMppt, index) => {
+      const defaultMppt = defaultPluginOptions.mppts[index] || defaultPluginOptions.mppts[0];
+      const normalizedAddress = Number(configuredMppt.address);
+
+      return {
+        // Identificativo SignalK del controller; se manca si usa il default per indice.
+        id: configuredMppt.id || defaultMppt.id,
+        // Indirizzo UART/DST del controller; evita polling con address=undefined.
+        address: Number.isFinite(normalizedAddress) ? normalizedAddress : defaultMppt.address,
+      };
+    });
+
     return {
       device: options.device || defaultPluginOptions.device,
       baudRate: Number(options.baudRate || defaultPluginOptions.baudRate),
       publishIntervalMs: Number(options.publishIntervalMs || defaultPluginOptions.publishIntervalMs),
       pollIntervalMs: Number(options.pollIntervalMs || defaultPluginOptions.pollIntervalMs),
-      mppts: Array.isArray(options.mppts) && options.mppts.length > 0
-        ? options.mppts
-        : defaultPluginOptions.mppts,
+      mppts: normalizedMppts,
     };
   }