shows how to set up a “mini solar power system”. will run small lights, fans, air compressors and other low power AC and DC items. also will charge most electronic portable devices (tablets, phones, laptops). consists of one 15 watt solar panel, one 12ah battery and a 70 watt inverter. total cost is about $100.00. great starter system. very lightweight sealed battery. system will also charge rechargeable AA AAA C D and 9V batteries (using standard battery charger). note that most items shown in video can run for several hours on the one battery. to run larger items add another battery to it. just hook it in parallel.