What i'm going to show you today is how to run your raspberry pi off the sun using solar power & Battery.

Step 1: What You Need

A raspberry pi
A solar panel (with built in charger controller or a Solar Charging Regulator)
A car power socket
A usb car power adapter
A battery
and some wire

Step 2: Connecting the Battery

First off we need to connect the wire to car power adapter then to the battery.

The battery is a 12V 1.3 ampHour battery The length of time the battery last very much depends on what you are doing with.

But here is quick calculation

If the raspberry pi uses 3 watts a hour then a 12v battery at 1.3 amp hours gives 15.6 watt hours

So 15.6 divide by 3 gives you 5.3 hours.

So the battery should last about 5 hours

If you want it to last long get a bigger batter or wire two up in parallel

Step 3: Connecting USB

Next we need to plug in the usb power adapter.

I know it possible to make a power adapter from a 12v Battery to USB connection however this way is easier and almost as cheap.

If you would like to make your own adapter search on instructables