diff --git a/srnemqtt/consumers/mqtt.py b/srnemqtt/consumers/mqtt.py
index 6600db3..db53002 100644
--- a/srnemqtt/consumers/mqtt.py
+++ b/srnemqtt/consumers/mqtt.py
@@ -82,6 +82,10 @@ MAP_VALUES: Dict[DataName, Dict[str, Any]] = {
         "state_class": "measurement",
     },
     DataName.LOAD_POWER: {"unit": "W", "type": "power", "state_class": "measurement"},
+    DataName.LOAD_ENABLED: {
+        "type": "outlet",
+        "platform": "switch",
+    },
     DataName.PANEL_VOLTAGE: {
         "unit": "V",
         "type": "voltage",
@@ -199,6 +203,7 @@ class MqttConsumer(BaseConsumer):
         type: Optional[str] = None,
         expiry: int = 90,
         state_class: Optional[str] = None,
+        platform: str = "sensor",
     ):
         assert state_class in [None, "measurement", "total", "total_increasing"]
         assert self.controller is not None
@@ -206,7 +211,7 @@ class MqttConsumer(BaseConsumer):
         res = {
             "~": f"{self.topic_prefix}",
             "unique_id": f"{self.controller_id}_{id}",
-            "object_id": f"{self.controller_id}_{id}",
+            "object_id": f"{self.controller_id}_{id}",  # Used for entity id
             "availability_topic": "~/available",
             "state_topic": f"~/{id}",
             "name": name,
@@ -216,7 +221,7 @@ class MqttConsumer(BaseConsumer):
                 ],
                 "manufacturer": self.controller.manufacturer,
                 "model": self.controller.model,
-                "hw_version": self.controller.version,
+                "sw_version": self.controller.version,
                 "via_device": self.settings["device_id"],
                 "suggested_area": "Solar panel",
                 "name": self.controller.name,
@@ -231,7 +236,10 @@ class MqttConsumer(BaseConsumer):
             res["dev_cla"] = type
         if state_class:
             res["state_class"] = state_class
-
+        if platform == "switch":
+            res["command_topic"] = f"{res['state_topic']}/set"
+            res["payload_on"] = True
+            res["payload_off"] = False
         return res
 
     # The callback for when the client receives a CONNACK response from the server.
@@ -246,6 +254,26 @@ class MqttConsumer(BaseConsumer):
             f"{userdata.topic_prefix}/available", payload="online", retain=True
         )
 
+        load_set_topic = f"{userdata.topic_prefix}/load_enabled/set"
+        client.message_callback_add(load_set_topic, userdata.on_load_switch)
+        client.subscribe(load_set_topic)
+
+    @staticmethod
+    def on_load_switch(
+        client: mqtt.Client, userdata: "MqttConsumer", message: mqtt.MQTTMessage
+    ):
+        assert userdata.controller is not None
+        print(message)
+        print(message.info)
+        print(message.state)
+        print(message.payload)
+        payload = message.payload.decode().upper() in ("ON", "TRUE", "ENABLE", "YES")
+
+        res = userdata.controller.load_enabled = payload
+        client.publish(
+            f"{userdata.topic_prefix}/load_enabled", payload=res, retain=True
+        )
+
     @staticmethod
     def on_connect_fail(client: mqtt.Client, userdata: "MqttConsumer"):
         print(userdata.__class__.__name__, "on_connect_fail")
@@ -283,9 +311,10 @@ class MqttConsumer(BaseConsumer):
                     km = MAP_VALUES[DataName(dataname)]
                     pretty_name = dataname.replace("_", " ").capitalize()
                     disc_prefix = self.settings["discovery_prefix"]
+                    platform = km.get("platform", "sensor")
 
                     self.client.publish(
-                        f"{disc_prefix}/sensor/{self.controller_id}/{dataname}/config",
+                        f"{disc_prefix}/{platform}/{self.controller_id}/{dataname}/config",
                         payload=json.dumps(
                             self.get_ha_config(dataname, pretty_name, **km)
                         ),
diff --git a/srnemqtt/protocol.py b/srnemqtt/protocol.py
index 5d536e7..bdb1c97 100644
--- a/srnemqtt/protocol.py
+++ b/srnemqtt/protocol.py
@@ -250,7 +250,7 @@ class ChargeController:
         p2 = data[1]
         p3 = (data[2] << 8) + data[3]
 
-        self._cached_serial = f"{p1}-{p2}-{p3}"
+        self._cached_serial = f"{p1:02n}-{p2:02n}-{p3:04n}"
         return self._cached_serial
 
     _cached_model: str | None = None