From 508ed257d46eb0b7e55f15fcb8114f43f8faa2c4 Mon Sep 17 00:00:00 2001
From: Jeff <34590663+jumbledbytes@users.noreply.github.com>
Date: Mon, 28 Feb 2022 11:37:11 -0800
Subject: [PATCH] Support disconnected Powerwall configuration (#67325)

Co-authored-by: J. Nick Koston <nick@koston.org>
---
 homeassistant/components/powerwall/binary_sensor.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/homeassistant/components/powerwall/binary_sensor.py b/homeassistant/components/powerwall/binary_sensor.py
index 868d9e3076d..fed47823c7f 100644
--- a/homeassistant/components/powerwall/binary_sensor.py
+++ b/homeassistant/components/powerwall/binary_sensor.py
@@ -110,6 +110,15 @@ class PowerWallChargingStatusSensor(PowerWallEntity, BinarySensorEntity):
     _attr_name = "Powerwall Charging"
     _attr_device_class = BinarySensorDeviceClass.BATTERY_CHARGING
 
+    @property
+    def available(self) -> bool:
+        """Powerwall is available."""
+        # Return False if no battery is installed
+        return (
+            super().available
+            and self.data.meters.get_meter(MeterType.BATTERY) is not None
+        )
+
     @property
     def unique_id(self) -> str:
         """Device Uniqueid."""