diff --git a/pikopy/piko.py b/pikopy/piko.py
index c140932..d21d1fa 100644
--- a/pikopy/piko.py
+++ b/pikopy/piko.py
@@ -154,11 +154,21 @@ def get_string2_current(self):
 
     def get_string3_voltage(self):
         """returns the voltage from string 3 in V"""
-        return int(self._get_raw_content()[11])
+        raw_content = self._get_raw_content()
+        if len(raw_content) < 14:
+            # String 3 not installed
+            return None
+        else:
+            return int(raw_content[11])
 
     def get_string3_current(self):
         """returns the current from string 3 in A"""
-        return float(self._get_raw_content()[13])
+        raw_content = self._get_raw_content()
+        if len(raw_content) < 14:
+            # String 3 not installed
+            return None
+        else:
+            return float(raw_content[13])
 
     def get_l1_voltage(self):
         """returns the voltage from line 1 in V"""
@@ -178,11 +188,23 @@ def get_l2_power(self):
 
     def get_l3_voltage(self):
         """returns the voltage from line 3 in V"""
-        return int(self._get_raw_content()[12])
+        raw_content = self._get_raw_content()
+        if len(raw_content) < 14:
+            # 2 Strings
+            return int(raw_content[11])
+        else:
+            # 3 Strings
+            return int(raw_content[12])
 
     def get_l3_power(self):
         """returns the power from line 3 in W"""
-        return int(self._get_raw_content()[14])
+        raw_content = self._get_raw_content()
+        if len(raw_content) < 14:
+            # 2 Strings
+            return int(raw_content[12])
+        else:
+            # 3 Strings
+            return int(raw_content[14])
 
     def _get_raw_content(self):
         """returns all values as a list"""
diff --git a/setup.py b/setup.py
index 89e31bd..b2683e6 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
 
 
 setup(name='pikopy',
-      version='1.0.0',
+      version='1.1.0',
       author='Christian Stade-Schuldt',
       author_email='stadeschuldt@gmail.com',
       url='https://github.com/Tafkas/KostalPikoPy',