Many people have hard earned Solar Installations but nothing much to plug into them. Oh sure there are the usual fans and light bulbs that run on 12 Volts, or the other stuff that needs to be run off an Inverter, but what about the stuff that runs off lower voltages like 4.2 Volts or 9 Volts. All this presupposes you have a Power Distribution Panel found in, '(16) http://www.instructables.com/id/Power-Distribution-Panel-For-Pluggables/
You will find some ideas in this collection for converting the stuff you already have. It's easy. Try it you'll like it and the cost is almost nothing.