diff --git a/app/src/main/java/org/woheller69/weather/SolarPowerPlant.java b/app/src/main/java/org/woheller69/weather/SolarPowerPlant.java
index 2b319ac..1b48601 100644
--- a/app/src/main/java/org/woheller69/weather/SolarPowerPlant.java
+++ b/app/src/main/java/org/woheller69/weather/SolarPowerPlant.java
@@ -19,12 +19,13 @@ public class SolarPowerPlant {
     double diffuseEfficiency;
     double inverterPowerLimit;
     double inverterEfficiency;
+    boolean isCentralInverter;
     double azimuthAngle;
     double tiltAngle;
     private final int[] shadingElevation;
     private final int[] shadingOpacity;
 
-    public SolarPowerPlant(double latitude, double longitude, double cellsMaxPower, double cellsArea, double cellsEfficiency, double cellsTempCoeff, double diffuseEfficiency, double inverterPowerLimit, double inverterEfficiency, double azimuthAngle, double tiltAngle, int[] shadingElevation, int[] shadingOpacity, double albedo ) {
+    public SolarPowerPlant(double latitude, double longitude, double cellsMaxPower, double cellsArea, double cellsEfficiency, double cellsTempCoeff, double diffuseEfficiency, double inverterPowerLimit, double inverterEfficiency,boolean isCentralInverter, double azimuthAngle, double tiltAngle, int[] shadingElevation, int[] shadingOpacity, double albedo ) {
         this.albedo = albedo;
         this.latitude = latitude;
         this.longitude = longitude;
@@ -39,6 +40,7 @@ public class SolarPowerPlant {
         this.shadingElevation = shadingElevation;
         this.shadingOpacity = shadingOpacity;
         this.cellsTempCoeff = cellsTempCoeff / 100;
+        this.isCentralInverter = isCentralInverter;
 
     }
 
@@ -111,7 +113,11 @@ public class SolarPowerPlant {
             dcPower = totalRadiationOnCell/1000 * (1+(cellTemperature - 25)*cellsTempCoeff) * cellsMaxPower;
         }
 
-        double acPower = Math.min(dcPower * inverterEfficiency, inverterPowerLimit);
+        double acPower;
+        if (!isCentralInverter)
+            acPower = Math.min(dcPower * inverterEfficiency, inverterPowerLimit);
+        else
+            acPower = dcPower * inverterEfficiency;  //do limiting on system level
 
         return (float) acPower;
     }
diff --git a/app/src/main/java/org/woheller69/weather/activities/ForecastCityActivity.java b/app/src/main/java/org/woheller69/weather/activities/ForecastCityActivity.java
index 2175c5b..7bda47e 100644
--- a/app/src/main/java/org/woheller69/weather/activities/ForecastCityActivity.java
+++ b/app/src/main/java/org/woheller69/weather/activities/ForecastCityActivity.java
@@ -219,12 +219,7 @@ public class ForecastCityActivity extends NavigationActivity implements IUpdatea
     }
 
     @Override
-    public void processNewWeekForecasts(List<WeekForecast> forecasts) {
-        stopRefreshAnimation();
-    }
-
-    @Override
-    public void processNewForecasts(List<HourlyForecast> hourlyForecasts) {
+    public void processNewForecasts(List<HourlyForecast> hourlyForecasts, List<WeekForecast> weekForecasts) {
         stopRefreshAnimation();
     }
 
diff --git a/app/src/main/java/org/woheller69/weather/activities/ManageLocationsActivity.java b/app/src/main/java/org/woheller69/weather/activities/ManageLocationsActivity.java
index a6df83b..b1a059a 100644
--- a/app/src/main/java/org/woheller69/weather/activities/ManageLocationsActivity.java
+++ b/app/src/main/java/org/woheller69/weather/activities/ManageLocationsActivity.java
@@ -18,6 +18,7 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.WindowManager;
+import android.widget.CheckBox;
 import android.widget.EditText;
 import android.widget.LinearLayout;
 import android.widget.TextView;
@@ -202,6 +203,7 @@ public class ManageLocationsActivity extends NavigationActivity {
         EditText editAlbedo = (EditText) dialogView.findViewById(R.id.EditLocation_Albedo);
         EditText editInverterPowerLimit = (EditText) dialogView.findViewById(R.id.EditLocation_Inverter_Power_Limit);
         EditText editInverterEfficiency = (EditText) dialogView.findViewById(R.id.EditLocation_Inverter_Efficiency);
+        CheckBox editIsCentralInverter = (CheckBox) dialogView.findViewById(R.id.EditLocation_Central_Inverter);
         TextView currentAzimuth = (TextView) dialogView.findViewById(R.id.edit_current_azi_ele);
 
         Long time = System.currentTimeMillis()/1000;
@@ -251,6 +253,7 @@ public class ManageLocationsActivity extends NavigationActivity {
         editAlbedo.setFilters(new InputFilter[]{ new InputFilterMinMax(0,1)});
         editInverterPowerLimit.setText(Float.toString(city.getInverterPowerLimit()));
         editInverterEfficiency.setText(Float.toString(city.getInverterEfficiency()));
+        editIsCentralInverter.setChecked(city.isCentralInverter());
         editInverterEfficiency.setFilters(new InputFilter[]{ new InputFilterMinMax(0, 100)});
         editTilt.addTextChangedListener(new TextWatcher() {
             @Override
@@ -285,6 +288,7 @@ public class ManageLocationsActivity extends NavigationActivity {
                     Float.parseFloat(editAlbedo.getText().toString().isEmpty() ? "0" : editAlbedo.getText().toString()),
                     Float.parseFloat(editInverterPowerLimit.getText().toString().isEmpty() ? "0" : editInverterPowerLimit.getText().toString()),
                     Float.parseFloat(editInverterEfficiency.getText().toString().isEmpty() ? "0" : editInverterEfficiency.getText().toString()),
+                    editIsCentralInverter.isChecked(),
                     shadingElevation,
                     shadingOpacity
                     );
@@ -321,6 +325,7 @@ public class ManageLocationsActivity extends NavigationActivity {
                     Float.parseFloat(editAlbedo.getText().toString().isEmpty() ? "0" : editAlbedo.getText().toString()),
                     Float.parseFloat(editInverterPowerLimit.getText().toString().isEmpty() ? "0" : editInverterPowerLimit.getText().toString()),
                     Float.parseFloat(editInverterEfficiency.getText().toString().isEmpty() ? "0" : editInverterEfficiency.getText().toString()),
+                    editIsCentralInverter.isChecked(),
                     shadingElevation,
                     shadingOpacity
             );
diff --git a/app/src/main/java/org/woheller69/weather/database/CityToWatch.java b/app/src/main/java/org/woheller69/weather/database/CityToWatch.java
index b66d91a..819aa22 100644
--- a/app/src/main/java/org/woheller69/weather/database/CityToWatch.java
+++ b/app/src/main/java/org/woheller69/weather/database/CityToWatch.java
@@ -24,6 +24,7 @@ public class CityToWatch {
     private float azimuthAngle;
     private float tiltAngle;
     private float albedo;
+    private boolean isCentralInverter;
     private int rank;
     private int[] shadingElevation = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
     private int[] shadingOpacity =   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
@@ -147,6 +148,11 @@ public class CityToWatch {
         this.inverterPowerLimit = inverterPowerLimit;
     }
 
+    public void setIsCentralInverter(boolean isCentralInverter) {
+        this.isCentralInverter = isCentralInverter;
+    }
+    public boolean isCentralInverter() {return isCentralInverter;}
+
     public void setDiffuseEfficiency(float diffuseEfficiency) {
         this.diffuseEfficiency = diffuseEfficiency;
     }
diff --git a/app/src/main/java/org/woheller69/weather/database/SQLiteHelper.java b/app/src/main/java/org/woheller69/weather/database/SQLiteHelper.java
index 83cb220..1a29934 100644
--- a/app/src/main/java/org/woheller69/weather/database/SQLiteHelper.java
+++ b/app/src/main/java/org/woheller69/weather/database/SQLiteHelper.java
@@ -20,7 +20,7 @@ import static androidx.core.app.JobIntentService.enqueueWork;
  */
 public class SQLiteHelper extends SQLiteOpenHelper {
 
-    private static final int DATABASE_VERSION = 3;
+    private static final int DATABASE_VERSION = 4;
     private Context context;
 
     private List<City> allCities = new ArrayList<>();
@@ -55,6 +55,7 @@ public class SQLiteHelper extends SQLiteOpenHelper {
     private static final String CITIES_TO_WATCH_SHADING_OPACITY = "shading_opacity";
     private static final String CITIES_TO_WATCH_CELLS_TEMP_COEFF = "cells_temp_coeff";
     private static final String CITIES_TO_WATCH_ALBEDO = "albedo";
+    private static final String CITIES_TO_WATCH_IS_CENTRAL_INVERTER = "is_central_inverter";
 
     //Names of columns in TABLE_FORECAST
     private static final String FORECAST_ID = "forecast_id";
@@ -139,7 +140,8 @@ public class SQLiteHelper extends SQLiteOpenHelper {
             CITIES_TO_WATCH_SHADING_ELEVATION + " VARCHAR(255) NOT NULL," +
             CITIES_TO_WATCH_SHADING_OPACITY + " VARCHAR(255) NOT NULL," +
             CITIES_TO_WATCH_CELLS_TEMP_COEFF + " REAL NOT NULL," +
-            CITIES_TO_WATCH_ALBEDO + " REAL NOT NULL)";
+            CITIES_TO_WATCH_ALBEDO + " REAL NOT NULL," +
+            CITIES_TO_WATCH_IS_CENTRAL_INVERTER + " INTEGER)";
 
     public static SQLiteHelper getInstance(Context context) {
         if (instance == null && context != null) {
@@ -170,6 +172,8 @@ public class SQLiteHelper extends SQLiteOpenHelper {
                 // we want both updates, so no break statement here...
             case 2:
                 db.execSQL("ALTER TABLE "+TABLE_CITIES_TO_WATCH+" ADD COLUMN "+CITIES_TO_WATCH_ALBEDO+" REAL DEFAULT 0");
+            case 3:
+                db.execSQL("ALTER TABLE "+TABLE_CITIES_TO_WATCH+" ADD COLUMN "+CITIES_TO_WATCH_IS_CENTRAL_INVERTER+" INTEGER DEFAULT 0");
         }
 
     }
@@ -199,6 +203,7 @@ public class SQLiteHelper extends SQLiteOpenHelper {
         values.put(CITIES_TO_WATCH_SHADING_OPACITY,city.getShadingOpacityString());
         values.put(CITIES_TO_WATCH_CELLS_TEMP_COEFF,city.getCellsTempCoeff());
         values.put(CITIES_TO_WATCH_ALBEDO,city.getAlbedo());
+        values.put(CITIES_TO_WATCH_IS_CENTRAL_INVERTER,city.isCentralInverter() ? 1 : 0);
 
         long id=database.insert(TABLE_CITIES_TO_WATCH, null, values);
 
@@ -234,6 +239,7 @@ public class SQLiteHelper extends SQLiteOpenHelper {
                         ", " + CITIES_TO_WATCH_SHADING_OPACITY +
                         ", " + CITIES_TO_WATCH_CELLS_TEMP_COEFF +
                         ", " + CITIES_TO_WATCH_ALBEDO +
+                        ", " + CITIES_TO_WATCH_IS_CENTRAL_INVERTER +
                         ", " + CITIES_TO_WATCH_COLUMN_RANK +
                         " FROM " + TABLE_CITIES_TO_WATCH +
                         " WHERE " + CITIES_TO_WATCH_CITY_ID + " = ?", arguments);
@@ -258,7 +264,8 @@ public class SQLiteHelper extends SQLiteOpenHelper {
             cityToWatch.setShadingOpacity(cursor.getString(14));
             cityToWatch.setCellsTempCoeff(Float.parseFloat(cursor.getString(15)));
             cityToWatch.setAlbedo(Float.parseFloat(cursor.getString(16)));
-            cityToWatch.setRank(Integer.parseInt(cursor.getString(17)));
+            cityToWatch.setIsCentralInverter(Integer.parseInt(cursor.getString(17)) == 1);
+            cityToWatch.setRank(Integer.parseInt(cursor.getString(18)));
 
             cursor.close();
         }
@@ -291,6 +298,7 @@ public class SQLiteHelper extends SQLiteOpenHelper {
                         ", " + CITIES_TO_WATCH_SHADING_OPACITY +
                         ", " + CITIES_TO_WATCH_CELLS_TEMP_COEFF +
                         ", " + CITIES_TO_WATCH_ALBEDO +
+                        ", " + CITIES_TO_WATCH_IS_CENTRAL_INVERTER +
                         ", " + CITIES_TO_WATCH_COLUMN_RANK +
                         " FROM " + TABLE_CITIES_TO_WATCH
                 , new String[]{});
@@ -317,7 +325,8 @@ public class SQLiteHelper extends SQLiteOpenHelper {
                 cityToWatch.setShadingOpacity(cursor.getString(14));
                 cityToWatch.setCellsTempCoeff(Float.parseFloat(cursor.getString(15)));
                 cityToWatch.setAlbedo(Float.parseFloat(cursor.getString(16)));
-                cityToWatch.setRank(Integer.parseInt(cursor.getString(17)));
+                cityToWatch.setIsCentralInverter(Integer.parseInt(cursor.getString(17)) == 1);
+                cityToWatch.setRank(Integer.parseInt(cursor.getString(18)));
 
                 cityToWatchList.add(cityToWatch);
             } while (cursor.moveToNext());
@@ -349,6 +358,7 @@ public class SQLiteHelper extends SQLiteOpenHelper {
         values.put(CITIES_TO_WATCH_SHADING_OPACITY,cityToWatch.getShadingOpacityString());
         values.put(CITIES_TO_WATCH_CELLS_TEMP_COEFF,cityToWatch.getCellsTempCoeff());
         values.put(CITIES_TO_WATCH_ALBEDO,cityToWatch.getAlbedo());
+        values.put(CITIES_TO_WATCH_IS_CENTRAL_INVERTER,cityToWatch.isCentralInverter() ? 1 : 0);
 
         database.update(TABLE_CITIES_TO_WATCH, values, CITIES_TO_WATCH_ID + " = ?",
                 new String[]{String.valueOf(cityToWatch.getId())});
diff --git a/app/src/main/java/org/woheller69/weather/ui/RecycleList/CityWeatherAdapter.java b/app/src/main/java/org/woheller69/weather/ui/RecycleList/CityWeatherAdapter.java
index ab01a9c..ec577b8 100644
--- a/app/src/main/java/org/woheller69/weather/ui/RecycleList/CityWeatherAdapter.java
+++ b/app/src/main/java/org/woheller69/weather/ui/RecycleList/CityWeatherAdapter.java
@@ -12,6 +12,7 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
+import android.widget.Toast;
 
 import com.db.chart.Tools;
 import com.db.chart.model.BarSet;
@@ -62,27 +63,30 @@ public class CityWeatherAdapter extends RecyclerView.Adapter<CityWeatherAdapter.
         List<HourlyForecast> hourlyForecasts = database.getForecastsByCityId(generalDataList.getCity_id());
         List<WeekForecast> weekforecasts = database.getWeekForecastsByCityId(generalDataList.getCity_id());
 
-        updateForecastData(hourlyForecasts);
-        updateWeekForecastData(weekforecasts);
+        updateForecastData(hourlyForecasts, weekforecasts);
 
     }
 
     // function update 3-hour or 1-hour forecast list
-    public void updateForecastData(List<HourlyForecast> hourlyForecasts) {
-        if (hourlyForecasts.isEmpty()) return;
+    public void updateForecastData(List<HourlyForecast> hourlyForecasts, List<WeekForecast> weekForecasts) {
+        if (hourlyForecasts.isEmpty() || weekForecasts.isEmpty()) return;
         SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context);
+        int cityId = hourlyForecasts.get(0).getCity_id();
+        SQLiteHelper dbHelper = SQLiteHelper.getInstance(context.getApplicationContext());
+        CityToWatch requestedCity = dbHelper.getCityToWatch(cityId);
+
+        Float centralInverterLimit = requestedCity.isCentralInverter() ? requestedCity.getInverterPowerLimit() : 0;
 
         if (sp.getBoolean("pref_summarize",false)){
-            int cityId = hourlyForecasts.get(0).getCity_id();
             ArrayList<Integer> CityIDList = new ArrayList<Integer>();
-            SQLiteHelper dbHelper = SQLiteHelper.getInstance(context.getApplicationContext());
             hourlyForecasts = dbHelper.getForecastsByCityId(cityId); //get fresh values from database to make sure we do add new values to sum values from last update
             List<CityToWatch> citiesToWatch = dbHelper.getAllCitiesToWatch();
-            CityToWatch requestedCity = dbHelper.getCityToWatch(cityId);
+
             for (int i = 0; i < citiesToWatch.size(); i++) {
                 CityToWatch city = citiesToWatch.get(i);
                 if (city.getCityId()!=requestedCity.getCityId() && city.getLatitude() == requestedCity.getLatitude() && city.getLongitude() == requestedCity.getLongitude()) {
                     CityIDList.add(city.getCityId());
+                    if (city.isCentralInverter()) centralInverterLimit += city.getInverterPowerLimit();
                 }
             }
             if (CityIDList.size()>0){
@@ -97,6 +101,7 @@ public class CityWeatherAdapter extends RecyclerView.Adapter<CityWeatherAdapter.
             }
         }
 
+        Toast.makeText(context, "Central Inverter Limit: "+centralInverterLimit, Toast.LENGTH_SHORT).show();
         courseDayList = new ArrayList<>();
 
         float energyCumulated=0;
@@ -104,6 +109,7 @@ public class CityWeatherAdapter extends RecyclerView.Adapter<CityWeatherAdapter.
         int stepCounter = 0; // Counter to track the number of steps taken in the loop
 
         for (HourlyForecast f : hourlyForecasts) {
+            if (centralInverterLimit>0) f.setPower(Math.min(f.getPower(),centralInverterLimit));  //apply central inverter limit if there is one
             float power = f.getPower();
             if (stepCounter > 0) energyCumulated += power;  //Ignore first value because power values are for preceding hour
             f.setEnergyCum(energyCumulated);
@@ -119,47 +125,25 @@ public class CityWeatherAdapter extends RecyclerView.Adapter<CityWeatherAdapter.
                 energyCumulated = 0;
             }
         }
-        notifyDataSetChanged();
-    }
 
-    // function for week forecast list
-    public void updateWeekForecastData(List<WeekForecast> forecasts) {
-        if (forecasts.isEmpty()) return;
-        int cityId = forecasts.get(0).getCity_id();
-
-        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context);
-        if (sp.getBoolean("pref_summarize",false)){
-            ArrayList<Integer> CityIDList = new ArrayList<Integer>();
-            SQLiteHelper dbHelper = SQLiteHelper.getInstance(context.getApplicationContext());
-            forecasts = dbHelper.getWeekForecastsByCityId(cityId);  //get fresh values from database to make sure we do add new values to sum values from last update
-            List<CityToWatch> citiesToWatch = dbHelper.getAllCitiesToWatch();
-            CityToWatch requestedCity = dbHelper.getCityToWatch(cityId);
-            for (int i = 0; i < citiesToWatch.size(); i++) {
-                CityToWatch city = citiesToWatch.get(i);
-                if (city.getCityId()!=requestedCity.getCityId() && city.getLatitude() == requestedCity.getLatitude() && city.getLongitude() == requestedCity.getLongitude()) {
-                    CityIDList.add(city.getCityId());
-                }
-            }
-            if (CityIDList.size()>0){
-                for (int c=0; c<CityIDList.size();c++) {
-                    int iteratorCityId = CityIDList.get(c);
-                    List<WeekForecast> wfc = dbHelper.getWeekForecastsByCityId(iteratorCityId);
-                    if (wfc.size() != forecasts.size()) break;  //maybe something went wrong during update or city is not yet updated
-                    for (int i=0;i<wfc.size();i++){
-                        forecasts.get(i).setEnergyDay(forecasts.get(i).getEnergyDay()+wfc.get(i).getEnergyDay());
-                    }
+        //Now calculate weekForecasts from hourlyForecasts
+        for (WeekForecast weekForecast: weekForecasts){
+            float totalEnergy = 0;
+            long timeNoon = weekForecast.getForecastTime();
+            for (HourlyForecast hourlyForecast: hourlyForecasts){
+                if ((hourlyForecast.getForecastTime()>=timeNoon-11*3600*1000L) && (hourlyForecast.getForecastTime()< timeNoon + 13*3600*1000L)){ //values are for preceding hour!
+                    totalEnergy+=hourlyForecast.getPower();
                 }
             }
+            weekForecast.setEnergyDay(totalEnergy/1000);
         }
 
-        weekForecastList = forecasts;
-
+        weekForecastList = weekForecasts;
 
         notifyDataSetChanged();
     }
 
 
-
     static class ViewHolder extends RecyclerView.ViewHolder {
         ViewHolder(View v) {
             super(v);
diff --git a/app/src/main/java/org/woheller69/weather/ui/RecycleList/RecyclerOverviewListAdapter.java b/app/src/main/java/org/woheller69/weather/ui/RecycleList/RecyclerOverviewListAdapter.java
index 7edc976..3c17457 100644
--- a/app/src/main/java/org/woheller69/weather/ui/RecycleList/RecyclerOverviewListAdapter.java
+++ b/app/src/main/java/org/woheller69/weather/ui/RecycleList/RecyclerOverviewListAdapter.java
@@ -128,7 +128,7 @@ public class RecyclerOverviewListAdapter extends RecyclerView.Adapter<ItemViewHo
     public CityToWatch getCitytoWatch(int position){
         return cities.get(position);
     }
-    public void updateCity(CityToWatch cityToWatch, String cityName, float latitude, float longitude, float azimuth, float tilt, float cellsMaxPower, float cellsArea, float cellsEfficiency, float cellsTempCoeff, float diffuseEfficiency, float albedo, float inverterPowerLimit, float inverterEfficiency, int[] shadingElevation, int[] shadingOpacity) {
+    public void updateCity(CityToWatch cityToWatch, String cityName, float latitude, float longitude, float azimuth, float tilt, float cellsMaxPower, float cellsArea, float cellsEfficiency, float cellsTempCoeff, float diffuseEfficiency, float albedo, float inverterPowerLimit, float inverterEfficiency, boolean isCentralInverter, int[] shadingElevation, int[] shadingOpacity) {
         cityToWatch.setCityName(cityName);
         cityToWatch.setLatitude(latitude);
         cityToWatch.setLongitude(longitude);
@@ -142,6 +142,7 @@ public class RecyclerOverviewListAdapter extends RecyclerView.Adapter<ItemViewHo
         cityToWatch.setAlbedo(albedo);
         cityToWatch.setInverterPowerLimit(inverterPowerLimit);
         cityToWatch.setInverterEfficiency(inverterEfficiency);
+        cityToWatch.setIsCentralInverter(isCentralInverter);
         cityToWatch.setShadingElevation(shadingElevation);
         cityToWatch.setShadingOpacity(shadingOpacity);
         database.updateCityToWatch(cityToWatch);
diff --git a/app/src/main/java/org/woheller69/weather/ui/WeatherCityFragment.java b/app/src/main/java/org/woheller69/weather/ui/WeatherCityFragment.java
index ce21919..4822d50 100644
--- a/app/src/main/java/org/woheller69/weather/ui/WeatherCityFragment.java
+++ b/app/src/main/java/org/woheller69/weather/ui/WeatherCityFragment.java
@@ -128,19 +128,10 @@ public class WeatherCityFragment extends Fragment implements IUpdateableCityUI {
     }
 
     @Override
-    public void processNewForecasts(List<HourlyForecast> hourlyForecasts) {
+    public void processNewForecasts(List<HourlyForecast> hourlyForecasts, List<WeekForecast> weekForecasts) {
         if (hourlyForecasts != null && hourlyForecasts.size() > 0 && hourlyForecasts.get(0).getCity_id() == mCityId) {
             if (mAdapter != null) {
-                mAdapter.updateForecastData(hourlyForecasts);
-            }
-        }
-    }
-
-    @Override
-    public void processNewWeekForecasts(List<WeekForecast> forecasts) {
-        if (forecasts != null && forecasts.size() > 0 && forecasts.get(0).getCity_id() == mCityId) {
-            if (mAdapter != null) {
-                mAdapter.updateWeekForecastData(forecasts);
+                mAdapter.updateForecastData(hourlyForecasts, weekForecasts);
             }
         }
     }
diff --git a/app/src/main/java/org/woheller69/weather/ui/updater/IUpdateableCityUI.java b/app/src/main/java/org/woheller69/weather/ui/updater/IUpdateableCityUI.java
index 305f095..527916c 100644
--- a/app/src/main/java/org/woheller69/weather/ui/updater/IUpdateableCityUI.java
+++ b/app/src/main/java/org/woheller69/weather/ui/updater/IUpdateableCityUI.java
@@ -12,7 +12,6 @@ import java.util.List;
 public interface IUpdateableCityUI {
     void processNewGeneralData(GeneralData data);
 
-    void processNewForecasts(List<HourlyForecast> hourlyForecasts);
+    void processNewForecasts(List<HourlyForecast> hourlyForecasts, List<WeekForecast> weekForecasts);
 
-    void processNewWeekForecasts(List<WeekForecast> forecasts);
 }
diff --git a/app/src/main/java/org/woheller69/weather/ui/updater/ViewUpdater.java b/app/src/main/java/org/woheller69/weather/ui/updater/ViewUpdater.java
index 8db5c96..959e29f 100644
--- a/app/src/main/java/org/woheller69/weather/ui/updater/ViewUpdater.java
+++ b/app/src/main/java/org/woheller69/weather/ui/updater/ViewUpdater.java
@@ -31,17 +31,11 @@ public class ViewUpdater {
         }
     }
 
-    public static void updateWeekForecasts(List<WeekForecast> forecasts) {
-        ArrayList<IUpdateableCityUI> subcopy = new ArrayList<>(subscribers);
-        for (IUpdateableCityUI sub : subcopy) {
-            sub.processNewWeekForecasts(forecasts);
-        }
-    }
 
-    public static void updateForecasts(List<HourlyForecast> hourlyForecasts) {
+    public static void updateForecasts(List<HourlyForecast> hourlyForecasts, List<WeekForecast> weekForecasts) {
         ArrayList<IUpdateableCityUI> subcopy = new ArrayList<>(subscribers);
         for (IUpdateableCityUI sub : subcopy) {
-            sub.processNewForecasts(hourlyForecasts);
+            sub.processNewForecasts(hourlyForecasts, weekForecasts);
         }
     }
 }
diff --git a/app/src/main/java/org/woheller69/weather/ui/viewPager/WeatherPagerAdapter.java b/app/src/main/java/org/woheller69/weather/ui/viewPager/WeatherPagerAdapter.java
index 09dbb63..c95b2fd 100644
--- a/app/src/main/java/org/woheller69/weather/ui/viewPager/WeatherPagerAdapter.java
+++ b/app/src/main/java/org/woheller69/weather/ui/viewPager/WeatherPagerAdapter.java
@@ -118,14 +118,10 @@ public class WeatherPagerAdapter extends FragmentStateAdapter implements IUpdate
     }
 
     @Override
-    public void processNewForecasts(List<HourlyForecast> hourlyForecasts) {
+    public void processNewForecasts(List<HourlyForecast> hourlyForecasts, List<WeekForecast> weekForecasts) {
         //empty because Fragments are subscribers themselves
     }
 
-    @Override
-    public void processNewWeekForecasts(List<WeekForecast> forecasts) {
-        //empty because Fragments are subscribers themselves
-    }
 
     public int getCityIDForPos(int pos) {
             CityToWatch city = cities.get(pos);
diff --git a/app/src/main/java/org/woheller69/weather/weather_api/open_meteo/OMDataExtractor.java b/app/src/main/java/org/woheller69/weather/weather_api/open_meteo/OMDataExtractor.java
index a886fbc..6eb8422 100644
--- a/app/src/main/java/org/woheller69/weather/weather_api/open_meteo/OMDataExtractor.java
+++ b/app/src/main/java/org/woheller69/weather/weather_api/open_meteo/OMDataExtractor.java
@@ -75,7 +75,7 @@ public class OMDataExtractor implements IDataExtractor {
 
             SQLiteHelper dbhelper = SQLiteHelper.getInstance(context);
             CityToWatch city = dbhelper.getCityToWatch(cityID);
-            SolarPowerPlant spp = new SolarPowerPlant(city.getLatitude(), city.getLongitude(), city.getCellsMaxPower(), city.getCellsArea(), city.getCellsEfficiency(), city.getCellsTempCoeff(), city.getDiffuseEfficiency(), city.getInverterPowerLimit(), city.getInverterEfficiency(), city.getAzimuthAngle(), city.getTiltAngle(), city.getShadingElevation(), city.getShadingOpacity(), city.getAlbedo());
+            SolarPowerPlant spp = new SolarPowerPlant(city.getLatitude(), city.getLongitude(), city.getCellsMaxPower(), city.getCellsArea(), city.getCellsEfficiency(), city.getCellsTempCoeff(), city.getDiffuseEfficiency(), city.getInverterPowerLimit(), city.getInverterEfficiency(), city.isCentralInverter(), city.getAzimuthAngle(), city.getTiltAngle(), city.getShadingElevation(), city.getShadingOpacity(), city.getAlbedo());
 
 
             IApiToDatabaseConversion conversion = new OMToDatabaseConversion();
diff --git a/app/src/main/java/org/woheller69/weather/weather_api/open_meteo/ProcessOMweatherAPIRequest.java b/app/src/main/java/org/woheller69/weather/weather_api/open_meteo/ProcessOMweatherAPIRequest.java
index a433b74..9684446 100644
--- a/app/src/main/java/org/woheller69/weather/weather_api/open_meteo/ProcessOMweatherAPIRequest.java
+++ b/app/src/main/java/org/woheller69/weather/weather_api/open_meteo/ProcessOMweatherAPIRequest.java
@@ -141,8 +141,7 @@ public class ProcessOMweatherAPIRequest implements IProcessHttpRequest {
                 dbHelper.addWeekForecasts(weekforecasts);
 
                 if (c == CityIDList.size()-1) ViewUpdater.updateGeneralDataData(generalData); // Call Viewupdater if last (requested) city is updated
-                if (c == CityIDList.size()-1) ViewUpdater.updateWeekForecasts(weekforecasts);
-                if (c == CityIDList.size()-1) ViewUpdater.updateForecasts(hourlyforecasts);
+                if (c == CityIDList.size()-1) ViewUpdater.updateForecasts(hourlyforecasts, weekforecasts);
 
             } catch (JSONException e) {
                 e.printStackTrace();
@@ -194,17 +193,6 @@ public class ProcessOMweatherAPIRequest implements IProcessHttpRequest {
             }
         }
 
-        for (WeekForecast weekForecast: weekforecasts){
-            float totalEnergy = 0;
-            Long timeNoon = weekForecast.getForecastTime();
-            for (HourlyForecast hourlyForecast: hourlyforecasts){
-                if ((hourlyForecast.getForecastTime()>=timeNoon-11*3600*1000L) && (hourlyForecast.getForecastTime()< timeNoon + 13*3600*1000L)){ //values are for preceding hour!
-                   totalEnergy+=hourlyForecast.getPower();
-                }
-            }
-            weekForecast.setEnergyDay(totalEnergy/1000);
-        }
-
         return weekforecasts;
     }
 
diff --git a/app/src/main/res/layout/dialog_edit_location.xml b/app/src/main/res/layout/dialog_edit_location.xml
index ce88ea2..0dee8c1 100644
--- a/app/src/main/res/layout/dialog_edit_location.xml
+++ b/app/src/main/res/layout/dialog_edit_location.xml
@@ -168,7 +168,15 @@
         android:layout_height="wrap_content"
         android:inputType="numberDecimal"
         android:hint="@string/edit_location_hint_inverter_efficiency"/>
-
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textStyle="bold"
+        android:hint="@string/edit_location_hint_central_inverter"/>
+    <CheckBox
+        android:id="@+id/EditLocation_Central_Inverter"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
     <LinearLayout
         android:id="@+id/edit_Location_shading"
         android:layout_width="match_parent"
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index 97aedb6..7bf428b 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -110,4 +110,5 @@
     <string name="edit_location_hint_albedo">Albedo [0..1]</string>
     <string name="settings_server_urls">Server URLs</string>
     <string name="settings_server_summary">Nur ändern, wenn Sie Ihre eigenen Server betreiben wollen</string>
+    <string name="edit_location_hint_central_inverter">Zentralwechselrichter</string>
 </resources>
diff --git a/app/src/main/res/values-it/strings.xml b/app/src/main/res/values-it/strings.xml
index d54c65b..82b093d 100644
--- a/app/src/main/res/values-it/strings.xml
+++ b/app/src/main/res/values-it/strings.xml
@@ -113,5 +113,6 @@
     <string name="github" translatable="false">GitHub</string>
     <string name="settings_server_urls">Server URLs</string>
     <string name="settings_server_summary">Cambia solo se vuoi ospitare un tuo server</string>
+    <string name="edit_location_hint_central_inverter">Invertitore centrale</string>
 
 </resources>
diff --git a/app/src/main/res/values-tr/strings.xml b/app/src/main/res/values-tr/strings.xml
index 8b7db3a..fbd6324 100644
--- a/app/src/main/res/values-tr/strings.xml
+++ b/app/src/main/res/values-tr/strings.xml
@@ -109,4 +109,5 @@
     <string name="edit_location_hint_albedo">Albedo [0..1]</string>
     <string name="settings_server_urls">Sunucu URL\'leri</string>
     <string name="settings_server_summary">Yalnızca kendi sunucularınızı barındırmak istiyorsanız değiştirin</string>
+    <string name="edit_location_hint_central_inverter">Merkezi invertör</string>
 </resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 39fe573..368ff81 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -113,5 +113,6 @@
     <string name="github" translatable="false">GitHub</string>
     <string name="settings_server_urls">Server URLs</string>
     <string name="settings_server_summary">Only change if you want to host your own servers</string>
+    <string name="edit_location_hint_central_inverter">Central Inverter</string>
 
 </resources>