diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0b1d08a..1577c6c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+## Release 0.6.4
+
+**Date**: `NOT RELEASED`
+
+### Changes
+
+- Added new sensor `Power Save Mode` that shows the Power Mode of a Tempest device. Attributes of the sensor gives a textual explanation. For more information [read here](https://help.weatherflow.com/hc/en-us/articles/360048877194-Solar-Power-Rechargeable-Battery)
+
 ## Release 0.6.3
 
 **Date**: `2023-10-17`
diff --git a/async_test_module.py b/async_test_module.py
index b91582e..f146671 100644
--- a/async_test_module.py
+++ b/async_test_module.py
@@ -62,6 +62,7 @@ async def main() -> None:
             print("FREEZING ALT: ", sensor_data.freezing_altitude)
             print("VOLTAGE: ", sensor_data.voltage)
             print("BATTERY: ", sensor_data.battery)
+            print("POWER SAVE MODE: ", sensor_data.power_save_mode)
 
             cnt += 1
 
diff --git a/pyweatherflow_forecast/__init__.py b/pyweatherflow_forecast/__init__.py
index bc2c3b7..ff1ce5e 100644
--- a/pyweatherflow_forecast/__init__.py
+++ b/pyweatherflow_forecast/__init__.py
@@ -17,6 +17,6 @@
 )
 
 __title__ = "pyweatherflow_forecast"
-__version__ = "0.6.3"
+__version__ = "0.6.4"
 __author__ = "briis"
 __license__ = "MIT"
diff --git a/pyweatherflow_forecast/data.py b/pyweatherflow_forecast/data.py
index dd433e7..a6378e8 100644
--- a/pyweatherflow_forecast/data.py
+++ b/pyweatherflow_forecast/data.py
@@ -667,6 +667,38 @@ def lightning_strike_last_epoch(self) -> datetime.timestamp:
         """Last lightning strike epoch time."""
         return self._lightning_strike_last_epoch
 
+    @property
+    def power_save_mode(self) -> int:
+        """Power Save Mode (Tempest devices)."""
+        if self._voltage is None or self._solar_radiation is None:
+            return None
+
+        _power_save_mode = None
+        if self._voltage >= 2.455:
+            _power_save_mode = 0
+        elif self._voltage <= 2.355:
+            _power_save_mode = 3
+        elif self._solar_radiation > 100:
+            # Assume charging and Voltage is increasing
+            if self._voltage >= 2.41:
+                _power_save_mode = 1
+            elif self._voltage > 2.375:
+                _power_save_mode = 2
+            else:
+                _power_save_mode = 3
+        else:
+            # Assume discharging and voltage is decreasing
+            if self._voltage > 2.415:
+                _power_save_mode = 0
+            elif self._voltage > 2.39:
+                _power_save_mode = 1
+            elif self._voltage > 2.355:
+                _power_save_mode = 2
+            else:
+                _power_save_mode = 3
+
+        return _power_save_mode
+
     @property
     def precip(self) -> float:
         """Precipitation."""
diff --git a/setup.py b/setup.py
index bb9307a..a4bea0c 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@
 
 setuptools.setup(
     name="pyweatherflow-forecast",
-    version="0.6.3",
+    version="0.6.4",
     author="briis",
     author_email="bjarne@briis.com",
     description="Gets the weather forecast data from WeatherFlow",