Powerwall integration (#12386)

* Powerwall integration

* textlint

source/_integrations/powerwall.markdown

@@ -0,0 +1,62 @@
+---
+title: Telsa Powerwall
+description: Instructions on how to integrate Tesla Power Walls into Home Assistant.
+ha_category:
+  - Binary Sensor
+  - Sensor
+ha_release: 0.108
+ha_iot_class: Local Polling
+ha_config_flow: true
+ha_codeowners:
+  - '@bdraco'
+ha_domain: powerwall
+---
+
+The `powerwall` integration allows you to integrate your [Tesla Powerwall](https://www.tesla.com/powerwall) into Home Assistant.
+
+There is currently support for the following device types within Home Assistant:
+
+- [Binary Sensor](#binary-sensor)
+- [Sensor](#sensor)
+
+## Configuration
+
+You will need the IP Address of your Powerwall to use this module.
+
+To add `Tesla Powerwall` to your installation, go to **Configuration** >> **Integrations** in the UI, click the button with `+` sign and from the list of integrations select **Tesla Powerwall**.
+
+Alternatively, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+powerwall:
+  ip_address: YOUR_POWERWALL_IP
+```
+
+{% configuration %}
+ip_address:
+  description: The IP address of your Powerwall.
+  required: true
+  type: string
+{% endconfiguration %}
+
+### Binary Sensor
+
+The following binary sensors are added for each Powerwall:
+
+- Powerwall Status
+- Powerwall Connected to Tesla
+- Grid Status
+
+### Sensor
+
+The following binary sensors are added for each Powerwall:
+
+- Powerwall Charge
+- Powerwall Site Now
+- Powerwall Load Now
+- Powerwall Battery Now
+- Powerwall Frequency Now (if applicable)
+- Powerwall Busway Now (if applicable)
+- Powerwall Solar Now (if applicable)
+- Powerwall Generator Now (if applicable)