Add Homevolt battery documentation

source/_integrations/homevolt.markdown

@@ -0,0 +1,44 @@
+---
+title: Homevolt
+description: Connect Homevolt batteries locally to expose sensors in Home Assistant.
+ha_category:
+  - Energy
+  - Sensor
+ha_iot_class: Local Polling
+ha_domain: homevolt
+ha_platforms:
+  - sensor
+ha_config_flow: true
+ha_codeowners:
+  - '@danielhiversen'
+ha_integration_type: device
+ha_release: 2026.2
+---
+
+The **Homevolt** {% term integration %} lets Home Assistant read local data from your Homevolt battery over your network, no cloud required.
+
+{% include integrations/config_flow.md %}
+
+API access must be explicitly enabled on the Homevolt device; contact Tibber Customer Support to activate the API.
+Configuration needs the device IP address and, if set on the device, a password. 
+
+## Sensors
+
+The {% term integration %} creates sensors reported by the device, including:
+
+- Power (W) and energy (Wh/kWh)
+- Voltage (V) and current (A)
+- Temperature (°C) and frequency (Hz)
+- Battery/percentage (%)
+- Signal strength (dB)
+- Text, count, or schedule status values
+
+## Troubleshooting
+
+- `Failed to connect`: confirm the IP address, device is powered, and reachable on your network.
+- `Invalid authentication`: verify the device password or remove it if none is set.
+
+## Removing the integration
+
+{% include integrations/remove_device_service.md %}
+