diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5647b9a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,107 @@
+# Created by .ignore support plugin (hsz.mobi)
+### Python template
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# celery beat schedule file
+celerybeat-schedule
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+
diff --git a/README.md b/README.md
index 75bed91..89b5363 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,28 @@
 # EnphaseInterface
 Python implementation interface to the Enphase Developer API
+
+## Installation
+
+`python3 -m pip install pyenface`
+
+## Usage
+
+```python
+from pyEnFace.EnphaseInterface import PandasEnphaseInterface
+
+client = client = PandasEnphaseInterface(userId=<YOUR USERID>, api_key=<YOUR API KEY>)
+
+# Request all systems
+client.index()
+
+# Request inventory
+client.inventory(system_id=<SYSTEM ID>)
+
+# Summary
+client.summary(system_id=<SYSTEM ID>)
+
+# Get data as pandas dataframe
+start = pd.Timestamp('20180101')
+
+client.energy_lifetime(system_id=<SYSTEM ID>, start_date=start)
+```
\ No newline at end of file
diff --git a/pyEnFace/EnphaseInterface.py b/pyEnFace/EnphaseInterface.py
index bd20765..d1e77cb 100644
--- a/pyEnFace/EnphaseInterface.py
+++ b/pyEnFace/EnphaseInterface.py
@@ -151,7 +151,7 @@ class RawEnphaseInterface(object):
 
     def __init__(self, userId, max_wait=DEFAULT_MAX_WAIT,
             useragent='Mozilla/5.0', datetimeType=DateTimeType.Enphase,
-            errorhandler=None):
+            errorhandler=None, api_key=None):
 
         if errorhandler==None:
             errorhandler=EnphaseErrorHandler(datetimeType,max_wait)
@@ -165,6 +165,9 @@ def __init__(self, userId, max_wait=DEFAULT_MAX_WAIT,
         self.opener.addheaders = [('User-agent',useragent)]
         self.apiDest = APIV2
 
+        if api_key is not None:
+            APIKEYRING.append(api_key)
+
     def _execQuery(self, system_id, command, extraParams = dict()):
         '''Generates a request url for the Enphase API'''
 
@@ -259,6 +262,12 @@ def energy_lifetime(self, system_id, **kwargs):
         validArgs = self._filterAttributes(('start_date','end_date'),kwargs)
         return self._execQuery(system_id, 'energy_lifetime', validArgs)
 
+    def consumption_lifetime(self, system_id, **kwargs):
+        """Get the lifetime energy consumption measured by the system"""
+
+        validArgs = self._filterAttributes(('start_date','end_date'), kwargs)
+        return self._execQuery(system_id, 'consumption_lifetime', validArgs)
+
     def envoys(self, system_id, **kwargs):
         '''List the envoys associated with the system'''
 
@@ -328,6 +337,8 @@ def _execQuery(self, system_id, command, extraParams = dict()):
 
         if command == 'energy_lifetime':
             output = self._energy_lifetime(data)
+        elif command == 'consumption_lifetime':
+            output = self._consumption_lifetime(data)
         elif command == 'envoys':
             output = self._envoys(data)
         elif command == 'index' or command == '':
@@ -348,15 +359,22 @@ def _execQuery(self, system_id, command, extraParams = dict()):
         indexes = output.index.names
         return self._datetimeify(output).set_index(indexes)
 
-    def _energy_lifetime(self,data):
-        d = json_normalize(data, 'production',['start_date','system_id'])
-        ts = to_timedelta(Series(d.index),unit='D')
-        d['start_date'] = to_datetime(d['start_date'],unit='s') + ts
+    def _lifetime(self, data, column):
+        """column can be 'production', or 'consumption'"""
+        d = json_normalize(data, column, ['start_date', 'system_id'])
+        ts = to_timedelta(Series(d.index), unit='D')
+        d['start_date'] = to_datetime(d['start_date']) + ts
         d['start_date'] = d['start_date'].apply(
-                lambda x:self.dtt.stringify('start_date',x))
-        d.rename(columns={0:'production'},inplace=True)
+            lambda x: self.dtt.stringify('start_date', x))
+        d.rename(columns={0: column}, inplace=True)
+
+        return d.set_index(['system_id', 'start_date'])
+
+    def _energy_lifetime(self, data):
+        return self._lifetime(data, "production")
 
-        return d.set_index(['system_id','start_date'])
+    def _consumption_lifetime(self, data):
+        return self._lifetime(data, "consumption")
 
     def _envoys(self,data):
         return json_normalize(data, 'envoys',