Your battery bank is all charged up and now you need a way to run your 115v appliances. Power invertes turn your batteries DC voltage into AC. Your two main options are true sine wave or modified sine wave. The version you pick depends on the application. True sine wive most accurately reproduces what you get out of a wall socket white flowing alternating waves. A modified sine wave is a cheaper easier to produce version that has a more on and off state rather. After reading this why would anyone not go with the full sine wave? True sine wave inverts can be fairly costly but worth it for your sensitive electronics like TV’s, Computers, printers, fax machines, and general entertainment products. If you are running tools, lights or other general purpose utilities you should be safe with a modified sine inverter.