diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..00a51af
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,6 @@
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# These are explicitly windows files and should use crlf
+*.bat           text eol=crlf
+
diff --git a/.gitignore b/.gitignore
index 1756d26..ae4cb91 100644
--- a/.gitignore
+++ b/.gitignore
@@ -39,3 +39,8 @@ gradle-app.setting
 # # Work around https://youtrack.jetbrains.com/issue/IDEA-116898
 # gradle/wrapper/gradle-wrapper.properties
 
+
+# Ignore Gradle build output directory
+build
+
+class_diagram.plantuml
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..aa19980
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,45 @@
+plugins {
+	id "com.github.roroche.plantuml" version "1.0.2" // (1)
+	id "org.fmiw.plantuml" version "0.1"
+}
+apply plugin: 'java'
+apply plugin: 'application'
+
+mainClassName = 'de.mrgeorgen.v2g.powerGrid'
+
+// tag::repositories[]
+repositories {
+    mavenCentral()
+}
+// end::repositories[]
+
+// tag::jar[]
+jar {
+    archiveBaseName = 'v2g'
+    archiveVersion =  '0.1.0'
+}
+// end::jar[]
+
+// tag::dependencies[]
+sourceCompatibility = 1.8
+targetCompatibility = 1.8
+
+dependencies {
+}
+
+classDiagram {
+	packageName = 'de.mrgeorgen.v2g'
+	outputFile = project.file('class_diagram.plantuml')
+}
+
+plantuml {
+	options {
+		format = 'png'
+	}
+	diagrams {
+		class_diagram {
+			sourceFile = project.file('class_diagram_custom.plantuml')
+		}
+	}
+}
+buildClassDiagram.dependsOn(build)
diff --git a/class_diagram_custom.plantuml b/class_diagram_custom.plantuml
new file mode 100644
index 0000000..52070fd
--- /dev/null
+++ b/class_diagram_custom.plantuml
@@ -0,0 +1,37 @@
+@startuml
+
+class "car" {
+  battery : int
+  fullBattery : int
+  chargeLock : int
+  chargeSpeed : int
+  model : String
+  id : int
+  charge()
+  setChargeLock(double chargeLock)
+  double getBatteryRelativ()
+}
+
+class "carGrid" {
+  dockedCars : ArrayList<car>
+  models : carTemplate[]
+  chargeCars()
+  fillWithCars()
+}
+
+class "carTemplate" {
+  model : String
+  chargeSpeed : int
+  fullBattery : int
+  range : int
+}
+
+class "powerGrid" {
+  energieAvailable : int
+}
+
+"carGrid" --> "*" "car" : dockedCars
+"powerGrid" --> "carGrid"
+"carGrid" --> "carTemplate"
+
+@enduml
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..e708b1c
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..da9702f
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.8-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..4f906e0
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..107acd3
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..1bc2698
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,10 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * The settings file is used to specify which projects to include in your build.
+ *
+ * Detailed information about configuring a multi-project build in Gradle can be found
+ * in the user manual at https://docs.gradle.org/6.8/userguide/multi_project_builds.html
+ */
+
+rootProject.name = 'v2g'
diff --git a/src/main/java/de/mrgeorgen/v2g/car.java b/src/main/java/de/mrgeorgen/v2g/car.java
new file mode 100644
index 0000000..75dfbf7
--- /dev/null
+++ b/src/main/java/de/mrgeorgen/v2g/car.java
@@ -0,0 +1,34 @@
+package de.mrgeorgen.v2g;
+
+public class car {
+	private int battery;
+    	private final int fullBattery;
+	private int chargeLock;
+	private final int chargeSpeed;
+	private final String model;
+	private final int id;
+
+	public car(String model, int fullBattery, int chargeSpeed, int id) { // id can be the same for different models
+		this.fullBattery = 1000 * fullBattery; // convert kWh to Wh
+		this.chargeSpeed = chargeSpeed * 1000; // convert kW to W
+		this.setChargeLock(0.6);
+		this.id = id;
+		this.model = model;
+		this.battery = this.fullBattery / 2;
+	}
+	public void charge() {
+		int chargeAmmount = Math.abs(powerGrid.energieAvailable) < this.chargeSpeed ? powerGrid.energieAvailable : powerGrid.energieAvailable > 0 ? this.chargeSpeed : -1 * this.chargeSpeed;
+		if(this.battery + chargeAmmount <= this.chargeLock && chargeAmmount < 0) chargeAmmount = (this.battery - this.chargeLock) * -1; // do not charge if the car gets under the charge lock
+		if(this.battery + chargeAmmount > this.fullBattery) chargeAmmount = this.fullBattery - this.battery; // prevent the battery from overcharging
+		if(this.battery + chargeAmmount < 0) chargeAmmount = this.battery * -1; // prevent the battery from dischargingunder 0%
+		if(chargeAmmount != 0) System.out.println(this.model + " nr. " + this.id + " is " + (chargeAmmount < 0 ? "dis" : "") + "charging with " + (double)Math.abs(chargeAmmount) / 1000 +  " kW. battery: " + (double)this.battery / 1000 + "/" + (double)this.fullBattery / 1000 + " kWh (" + Math.round(getBatteryRelativ() * 100) + "%)");
+		this.battery += chargeAmmount;
+		powerGrid.energieAvailable -= chargeAmmount;
+    	}
+	public void setChargeLock(double chargeLock) {
+		this.chargeLock = (int)(this.fullBattery * chargeLock);
+	}
+	public double getBatteryRelativ() {
+		return (double)this.battery / this.fullBattery;
+	}
+}
diff --git a/src/main/java/de/mrgeorgen/v2g/carGrid.java b/src/main/java/de/mrgeorgen/v2g/carGrid.java
new file mode 100644
index 0000000..6d7785a
--- /dev/null
+++ b/src/main/java/de/mrgeorgen/v2g/carGrid.java
@@ -0,0 +1,41 @@
+package de.mrgeorgen.v2g;
+import java.util.ArrayList;
+import java.util.Random;
+import java.util.Collections;
+import java.util.Comparator;
+import java.lang.Double;
+public class carGrid {
+	public ArrayList<car> dockedCars = new ArrayList<car>();
+	private final carTemplate[] models = {new carTemplate("Tesla Model 3", 50, 160, 335),
+	new carTemplate("Renault Zoe ZE50", 52, 46, 315),
+	new carTemplate("BMW i3", 38, 49, 235),
+	new carTemplate("Nissan Leaf", 36, 46, 220),
+	new carTemplate("Volkswagen ID.4", 150, 125, 400),
+	new carTemplate("Tesla Model S Long Range", 90, 250, 555),
+	new carTemplate("Smart EQ forfour", 17, 5, 95),
+	new carTemplate("Honda e", 29, 56, 170)};
+	public void fillWithCars() {
+		Random random = new Random();
+		for(carTemplate carModel : models) {
+			final int numberOfCars = random.nextInt(10);
+			for(int i = 0; i < numberOfCars; ++i) {
+				dockedCars.add(new car(carModel.model, carModel.fullBattery, carModel.chargeSpeed, i));
+			}
+		}
+	}
+	public void chargeCars() {
+		Collections.sort(dockedCars, new Comparator<car>() {
+			public int compare(car car1, car car2) {
+				Double car1RelativBattery = car1.getBatteryRelativ();
+				Double car2RelativBattery = car2.getBatteryRelativ();
+				return car1RelativBattery.compareTo(car2RelativBattery);
+			}
+		});
+		if(powerGrid.energieAvailable < 0) Collections.reverse(dockedCars);
+		dockedCars.forEach((car car) -> {
+			car.charge();
+		});
+		if(powerGrid.energieAvailable > 0) System.out.println(powerGrid.energieAvailable + " W could not be used by the cars");
+		else if(powerGrid.energieAvailable < 0) System.out.println(Math.abs(powerGrid.energieAvailable) + " W could not be taken from the cars");
+	}
+}
diff --git a/src/main/java/de/mrgeorgen/v2g/carTemplate.java b/src/main/java/de/mrgeorgen/v2g/carTemplate.java
new file mode 100644
index 0000000..a639bf3
--- /dev/null
+++ b/src/main/java/de/mrgeorgen/v2g/carTemplate.java
@@ -0,0 +1,15 @@
+package de.mrgeorgen.v2g;
+
+public class carTemplate {
+	public final String model;
+	public final int chargeSpeed;
+	public final int fullBattery;
+	public final int range;
+
+	public carTemplate(String model, int fullBattery, int chargeSpeed, int range) {
+		this.model = model;
+		this.chargeSpeed = chargeSpeed;
+		this.fullBattery = fullBattery;
+		this.range = range;
+	}
+}
diff --git a/src/main/java/de/mrgeorgen/v2g/powerGrid.java b/src/main/java/de/mrgeorgen/v2g/powerGrid.java
new file mode 100644
index 0000000..09f9adf
--- /dev/null
+++ b/src/main/java/de/mrgeorgen/v2g/powerGrid.java
@@ -0,0 +1,26 @@
+package de.mrgeorgen.v2g;
+import java.util.Random;
+public class powerGrid {
+	public static int energieAvailable;
+	public static void main(String args[]) {
+		final carGrid carGrid = new carGrid();
+		if(args.length != 1) {
+			System.out.println("Invalid Syntax. Use the number of days the simulation shell run as the first argument");
+			return;
+		}
+		carGrid.fillWithCars();
+		final int hourSimulationRuns = Integer.parseInt(args[0]) * 24;
+		Random random = new Random();
+		for(int houresPassed = 0; houresPassed < hourSimulationRuns; ++houresPassed) {
+			final int hourOfDay = houresPassed % 24;
+			System.out.println("Day " + houresPassed / 24 + " Hour " + hourOfDay);
+			int averageEnergie;
+			if(hourOfDay < 6 || hourOfDay > 22) averageEnergie = carGrid.dockedCars.size() * 3000; // energie available at night
+			else if(hourOfDay < 7) averageEnergie = carGrid.dockedCars.size() * -1000; // energie for light in the morning
+			else if(hourOfDay < 19) averageEnergie = carGrid.dockedCars.size() * -500; // at the day energie is still needed but not as much because the lights are not on
+			else /* hourOfDay > 19 && hourOfDay < 23 */ averageEnergie = carGrid.dockedCars.size() * -1000; // the lights are on again
+			energieAvailable = (int)(averageEnergie * (0.5 + 1.5 * random.nextDouble()));
+			carGrid.chargeCars();
+		}
+	}
+}