diff --git a/.gitignore b/.gitignore
index 568683a..60f8519 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,5 @@
 /dist
 /solax.egg-info
 .DS_Store
+.eggs/**
+/build/**
diff --git a/solax/__init__.py b/solax/__init__.py
index c376924..1d68fd1 100644
--- a/solax/__init__.py
+++ b/solax/__init__.py
@@ -33,8 +33,8 @@ async def rt_request(inv, retry, t_wait=0):
         raise
 
 
-async def real_time_api(ip_address, port=80):
-    i = await inverter.discover(ip_address, port)
+async def real_time_api(ip_address, port=80, pwd=''):
+    i = await inverter.discover(ip_address, port, pwd)
     return RealTimeAPI(i)
 
 
diff --git a/solax/inverter.py b/solax/inverter.py
index 40ab735..0a94f37 100644
--- a/solax/inverter.py
+++ b/solax/inverter.py
@@ -20,14 +20,16 @@ class DiscoveryError(Exception):
 
 class Inverter:
     """Base wrapper around Inverter HTTP API"""
-    def __init__(self, host, port):
+
+    def __init__(self, host, port, pwd=''):
         self.host = host
         self.port = port
+        self.pwd = pwd
 
     async def get_data(self):
         try:
             data = await self.make_request(
-                self.host, self.port
+                self.host, self.port, self.pwd
             )
         except aiohttp.ClientError as ex:
             msg = "Could not connect to inverter endpoint"
@@ -41,7 +43,7 @@ async def get_data(self):
         return data
 
     @classmethod
-    async def make_request(cls, host, port):
+    async def make_request(cls, host, port, pwd=''):
         """
         Return instance of 'InverterResponse'
         Raise exception if unable to get data
@@ -71,10 +73,10 @@ def map_response(resp_data, sensor_map):
         }
 
 
-async def discover(host, port) -> Inverter:
+async def discover(host, port, pwd='') -> Inverter:
     failures = []
     for inverter in REGISTRY:
-        i = inverter(host, port)
+        i = inverter(host, port, pwd)
         try:
             await i.get_data()
             return i
@@ -154,7 +156,7 @@ class XHybrid(Inverter):
     }
 
     @classmethod
-    async def make_request(cls, host, port=80):
+    async def make_request(cls, host, port=80, pwd=''):
         base = 'http://{}:{}/api/realTimeData.htm'
         url = base.format(host, port)
         async with aiohttp.ClientSession() as session:
@@ -185,9 +187,13 @@ class InverterPost(Inverter):
     #  so we can disable the pylint warning
     # pylint: disable=W0223
     @classmethod
-    async def make_request(cls, host, port=80):
-        base = 'http://{}:{}/?optType=ReadRealTimeData'
-        url = base.format(host, port)
+    async def make_request(cls, host, port=80, pwd=''):
+        if not pwd:
+            base = 'http://{}:{}/?optType=ReadRealTimeData'
+            url = base.format(host, port)
+        else:
+            base = 'http://{}:{}/?optType=ReadRealTimeData&pwd={}&'
+            url = base.format(host, port, pwd)
         async with aiohttp.ClientSession() as session:
             async with session.post(url) as req:
                 resp = await req.read()
diff --git a/tests/test_base_inverter.py b/tests/test_base_inverter.py
index 21607db..8d4a296 100644
--- a/tests/test_base_inverter.py
+++ b/tests/test_base_inverter.py
@@ -9,6 +9,12 @@ async def test_unimplemented_make_request():
         await inverter.Inverter.make_request('localhost', 80)
 
 
+@pytest.mark.asyncio
+async def test_unimplemented_make_request_with_pwd():
+    with pytest.raises(NotImplementedError):
+        await inverter.Inverter.make_request('localhost', 80, 'pwd')
+
+
 def test_unimplemented_sensor_map():
     with pytest.raises(NotImplementedError):
         inverter.Inverter.sensor_map()
diff --git a/tests/test_discovery.py b/tests/test_discovery.py
index 5df3309..5c106ab 100644
--- a/tests/test_discovery.py
+++ b/tests/test_discovery.py
@@ -17,6 +17,12 @@ async def test_discovery_no_host():
         await solax.real_time_api('localhost', 2)
 
 
+@pytest.mark.asyncio
+async def test_discovery_no_host_with_pwd():
+    with pytest.raises(inverter.DiscoveryError):
+        await solax.real_time_api('localhost', 2, 'pwd')
+
+
 @pytest.mark.asyncio
 async def test_discovery_unknown_webserver(simple_http_fixture):
     with pytest.raises(inverter.DiscoveryError):