diff --git a/esp32/include/ControllerConfiguration.h b/esp32/include/ControllerConfiguration.h
index acf4ddc..268a237 100644
--- a/esp32/include/ControllerConfiguration.h
+++ b/esp32/include/ControllerConfiguration.h
@@ -110,6 +110,7 @@
 #define MAX_PLANTS          7
 #define SOLAR_CHARGE_MIN_VOLTAGE 7  /**< Sun is rising (morning detected) */
 #define SOLAR_CHARGE_MAX_VOLTAGE 9  /**< Sun is shining (noon)  */
+#define SOLAR_MAX_VOLTAGE_POSSIBLE 100  /**< higher values are treated as not connected sensor  */
 #define VOLT_MAX_BATT               4.2f
 
 #define MAX_CONFIG_SETTING_ITEMS 100 /**< Parameter, that can be configured in Homie */
diff --git a/esp32/include/LogDefines.h b/esp32/include/LogDefines.h
index dc6ff3c..f007df2 100644
--- a/esp32/include/LogDefines.h
+++ b/esp32/include/LogDefines.h
@@ -37,4 +37,5 @@
 #define LOG_SLEEP_DAY 101
 #define LOG_SLEEP_CYCLE 102
 #define LOG_MISSING_PUMP -4
-#define LOG_BOOT_ERROR_DETECTION 10000
\ No newline at end of file
+#define LOG_BOOT_ERROR_DETECTION 10000
+#define LOG_SOLAR_CHARGER_MISSING 300
\ No newline at end of file
diff --git a/esp32/src/main.cpp b/esp32/src/main.cpp
index 0df2994..696baab 100644
--- a/esp32/src/main.cpp
+++ b/esp32/src/main.cpp
@@ -1063,7 +1063,11 @@ void plantcontrol()
     sensorLipo.setProperty("ICA").send(String(battery.getICA()));
     sensorLipo.setProperty("DCA").send(String(battery.getDCA()));
     sensorLipo.setProperty("CCA").send(String(battery.getCCA()));
-    sensorSolar.setProperty("volt").send(String(mSolarVoltage));
+    if (mSolarVoltage < SOLAR_MAX_VOLTAGE_POSSIBLE) {
+      sensorSolar.setProperty("volt").send(String(mSolarVoltage));
+    } else {
+      log(LOG_LEVEL_INFO, String("Ignore unrealistc sun voltage" + String(mSolarVoltage) +"V"), LOG_SOLAR_CHARGER_MISSING);
+    }
     sensorTemp.setProperty(TEMPERATUR_SENSOR_CHIP).send(String(chipTemp));
   }
   else