diff --git a/include/Configuration.h b/include/Configuration.h
index 4253964..08f419f 100644
--- a/include/Configuration.h
+++ b/include/Configuration.h
@@ -3,7 +3,7 @@
 #include <Arduino.h>
 
 #define CONFIG_FILENAME "/config.bin"
-#define CONFIG_VERSION 0x00010800 // 0.1.8 // make sure to clean all after change
+#define CONFIG_VERSION 0x00010900 // 0.1.9 // make sure to clean all after change
 
 #define WIFI_MAX_SSID_STRLEN 31
 #define WIFI_MAX_PASSWORD_STRLEN 31
@@ -57,6 +57,10 @@ struct CONFIG_T {
     char Mqtt_LwtValue_Offline[MQTT_MAX_LWTVALUE_STRLEN + 1];
 
     INVERTER_CONFIG_T Inverter[INV_MAX_COUNT];
+
+    uint64_t Dtu_Serial;
+    uint32_t Dtu_PollInterval;
+    uint8_t Dtu_PaLevel;
 };
 
 class ConfigurationClass {
diff --git a/include/defaults.h b/include/defaults.h
index 1a2c00b..b26e74d 100644
--- a/include/defaults.h
+++ b/include/defaults.h
@@ -30,4 +30,8 @@
 #define MQTT_RETAIN true
 #define MQTT_LWT_TOPIC "status"
 #define MQTT_LWT_ONLINE "online"
-#define MQTT_LWT_OFFLINE "offline"
\ No newline at end of file
+#define MQTT_LWT_OFFLINE "offline"
+
+#define DTU_SERIAL 99978563412
+#define DTU_POLL_INTERVAL 5
+#define DTU_PA_LEVEL 0
\ No newline at end of file
diff --git a/src/Configuration.cpp b/src/Configuration.cpp
index a68f560..ca3d47f 100644
--- a/src/Configuration.cpp
+++ b/src/Configuration.cpp
@@ -102,6 +102,12 @@ void ConfigurationClass::migrate()
         }
     }
 
+    if (config.Cfg_Version < 0x00010900) {
+        config.Dtu_Serial = DTU_SERIAL;
+        config.Dtu_PollInterval = DTU_POLL_INTERVAL;
+        config.Dtu_PaLevel = DTU_PA_LEVEL;
+    }
+
     config.Cfg_Version = CONFIG_VERSION;
     write();
 }