Add PVOutput docs (#1406)

source/_components/sensor.pvoutput.markdown

@@ -0,0 +1,37 @@
+---
+layout: page
+title: "PVOutput Sensor"
+description: "Instructions how to use PVOutput within Home Assistant."
+date: 2016-11-06 10:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: pvoutput.png
+ha_category: Energy
+ha_release: 0.33
+---
+
+
+The `pvoutput` sensor platform consumes informations from [PVOutput](http://pvoutput.org/) which were uploaded by your solar photovoltaic (PV) system. 
+
+To add PVOutput details to your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: pvoutput
+    system_id: YOUR_SYSTEM_ID
+    api_key: YOUR_API_KEY
+    scan_interval: 120
+```
+
+Configuration variables:
+
+- **api_key** (*Required*): Your API key. A read-only key is fine.
+- **system_id** (*Required*): The ID of your station.
+
+<p class='note warning'>
+It's recommended to set `scan_interval:` according to a value greater than 60 seconds. The service only allows 60 requests per hour but the sensor's default is 30 seconds.
+</p>
+