If you want to supply alternative power to your house with batteries or solar panels you’ll need a power inverter to convert from the battery (most likely 12 or 24 Volt) system to the 110 AC found in a home. Here is agreat article on inverter design and what criteria to use in selecting an inverter that suits your needs. http://electronics.howstuffworks.com/gadgets/automotive/dc-ac-power-inverter.htm/printable