diff --git a/src/globalConfig.cpp b/src/globalConfig.cpp
index 8776862..5c433ed 100644
--- a/src/globalConfig.cpp
+++ b/src/globalConfig.cpp
@@ -27,6 +27,7 @@ uint16_t cfgMqttPort;                 // Port of MQTT broker (optional)
 char     cfgMqttUser[32];             // MQTT: Username
 char     cfgMqttPass[32];             // MQTT: Password
 uint8_t  cfgMqttLp[WB_CNT];           // Array with assignments to openWB loadpoints, e.g. [4,2,0,1]: Box0 = LP4, Box1 = LP2, Box2 = no MQTT, Box3 = LP1
+char     cfgMqttWattTopic[60];        // MQTT: Topic for setting the watt value for PV charging, default: "wbec/pv/setWatt"
 char     cfgNtpServer[30];            // NTP server
 char     cfgFoxUser[32];              // powerfox: Username
 char     cfgFoxPass[16];              // powerfox: Password
@@ -134,6 +135,7 @@ void loadConfig() {
 	cfgMqttPort               = doc["cfgMqttPort"]           | 1883UL;
 	strncpy(cfgMqttUser,        doc["cfgMqttUser"]           | "",                 sizeof(cfgMqttUser));
 	strncpy(cfgMqttPass,        doc["cfgMqttPass"]           | "",                 sizeof(cfgMqttPass));
+	strncpy(cfgMqttWattTopic,   doc["cfgMqttWattTopic"]      | "wbec/pv/setWatt",  sizeof(cfgMqttWattTopic));
 	strncpy(cfgNtpServer,       doc["cfgNtpServer"]          | "europe.pool.ntp.org", sizeof(cfgNtpServer));
 	strncpy(cfgFoxUser,         doc["cfgFoxUser"]            | "",                 sizeof(cfgFoxUser));
 	strncpy(cfgFoxPass,         doc["cfgFoxPass"]            | "",                 sizeof(cfgFoxPass));
diff --git a/src/globalConfig.h b/src/globalConfig.h
index ce1df5f..de695aa 100644
--- a/src/globalConfig.h
+++ b/src/globalConfig.h
@@ -38,6 +38,7 @@ extern uint16_t cfgMqttPort;                 // Port of MQTT broker (optional)
 extern char     cfgMqttUser[32];             // MQTT: Username
 extern char     cfgMqttPass[32];             // MQTT: Password
 extern uint8_t  cfgMqttLp[WB_CNT];           // Array with assignments to openWB loadpoints, e.g. [4,2,0,1]: Box0 = LP4, Box1 = LP2, Box2 = no MQTT, Box3 = LP1
+extern char     cfgMqttWattTopic[60];        // MQTT: Topic for setting the watt value for PV charging, default: "wbec/pv/setWatt"
 extern char     cfgNtpServer[30];            // NTP server
 extern char     cfgFoxUser[32];              // powerfox: Username
 extern char     cfgFoxPass[16];              // powerfox: Password
diff --git a/src/mqtt.cpp b/src/mqtt.cpp
index 99b7040..aa0d942 100644
--- a/src/mqtt.cpp
+++ b/src/mqtt.cpp
@@ -92,6 +92,12 @@ void callback(char* topic, byte* payload, uint8_t length)
 			LOG(0, ", no box assigned", "");
 		}
 	}
+
+	// set the watt value via MQTT (#54)
+	if (strcmp(topic, cfgMqttWattTopic) == 0) {
+		pv_setWatt(atol(buffer));
+	}
+
 	callbackActive = false;
 }
 
@@ -134,6 +140,7 @@ void reconnect() {
 				client.subscribe(topic);
 			}
 		}
+		client.subscribe(cfgMqttWattTopic);
 	} else {
 		LOG(m, "failed, rc=%d try again in 5 seconds", client.state())
 	}