Removed the INVERTER_BATTERY_CAPACITY environment variable and updated the inverter code to fetch battery capacity directly from the SEMSPortal API.

Author: felixschndr

.env.example

@@ -10,7 +10,6 @@ POWER_USAGE_FACTOR=
 TIBBER_API_TOKEN=
 
 INVERTER_HOSTNAME=
-INVERTER_BATTERY_CAPACITY=
 INVERTER_TARGET_MIN_STATE_OF_CHARGE=
 
 SEMSPORTAL_USERNAME=

README.md

@@ -131,7 +131,6 @@ When the current time is a price minimum, the program wakes up and does the foll
    | `POWER_USAGE_FACTOR`                                                                            | The amount of power used during the day vs during the night as a percentage value. E.g. if the value is set to `0.6` the program assumes you use 60 % of the daily power usage between 6 AM and 6 PM and 40 % between 6 PM and 6 AM.                                                | `0.6`                        | A decimal number between `0` and `1`, typically between `0.5` and `0.8`                                                      |
    | `TIBBER_API_TOKEN`                                                                              | The token to crawl the Tibber API. See https://developer.tibber.com/docs/guides/calling-api for more information.                                                                                                                                                                   | -                            | A string, example: `my-secret-token`                                                                                         |
    | `INVERTER_HOSTNAME`                                                                             | The hostname or IP of the inverter.                                                                                                                                                                                                                                                 | -                            | [`inverter.mydomain.com`, `192.168.5.10`, ...]                                                                               |
-   | `INVERTER_BATTERY_CAPACITY`                                                                     | The capacity of the battery in watt hours without any separators.                                                                                                                                                                                                                   | -                            | A number, typically between `3000` and `15000`                                                                               |
    | `INVERTER_TARGET_MIN_STATE_OF_CHARGE`                                                           | The state of charge the battery shall have when reaching the next minimum as a buffer.                                                                                                                                                                                              | `20`                         | A number between `0` and `100`, typically between `0` and `40`                                                               |
    | `SEMSPORTAL_USERNAME`                                                                           | The username to login into the SEMSPortal.                                                                                                                                                                                                                                          | -                            | A string, example: `[email protected]`                                                                                       |
    | `SEMSPORTAL_PASSWORD`                                                                           | The password to login into the SEMSPortal.                                                                                                                                                                                                                                          | -                            | A string, example: `my-secret-password`                                                                                      |

source/inverter.py

@@ -5,6 +5,7 @@
 from environment_variable_getter import EnvironmentVariableGetter
 from goodwe.et import OperationMode
 from logger import LoggerMixin
+from sems_portal_api_handler import SemsPortalApiHandler
 
 
 class Inverter(LoggerMixin):
@@ -14,7 +15,8 @@ def __init__(self):
         self.device = None
 
         self.hostname = EnvironmentVariableGetter.get("INVERTER_HOSTNAME")
-        self.battery_capacity = EnergyAmount(float(EnvironmentVariableGetter.get("INVERTER_BATTERY_CAPACITY")))
+        sems_portal_api_handler = SemsPortalApiHandler()
+        self.battery_capacity = sems_portal_api_handler.get_battery_capacity()
 
     def connect(self) -> None:
         """

source/sems_portal_api_handler.py

@@ -332,7 +332,30 @@ def _get_value_of_line_by_line_index_and_time_key(lines: dict, line_index: int,
         """
         return int([line for line in lines[line_index]["xy"] if line["x"] == time_key][0]["y"])
 
+    def get_battery_capacity(self) -> EnergyAmount:
+        """
+        Retrieves the battery capacity from the SEMSPORTAL API.
+
+        Returns:
+            EnergyAmount: The battery capacity retrieved from the SEMSPORTAL API.
+        """
+        self.login()
+
+        self.log.debug("Crawling the SEMSPORTAL API for the capacity of the battery...")
+
+        url = "https://eu.semsportal.com/api/v3/PowerStation/GetPlantDetailByPowerstationId"
+        headers = {
+            "Content-Type": "application/json",
+            "Token": f'{{"version":"v2.1.0","client":"ios","language":"en", "timestamp": "{self.timestamp}", "uid": "{self.user_id}", "token": "{self.token}"}}',
+        }
+        payload = {
+            "powerStationId": EnvironmentVariableGetter.get("SEMSPORTAL_POWERSTATION_ID"),
+        }
+
+        response = requests.post(url, headers=headers, json=payload, timeout=20)
+        response.raise_for_status()
+        response = response.json()
+
+        self.log.trace(f"Retrieved data: {response}")
 
-if __name__ == "__main__":
-    sems_portal_api_handler = SemsPortalApiHandler()
-    sems_portal_api_handler.write_values_to_database()
+        return EnergyAmount.from_kilo_watt_hours(response["data"]["info"]["battery_capacity"])