The 12/500/20-16 MultiPlus intelligently combines the functions of a powerful 500VA 12V pure sine wave inverter, a sophisticated 20A battery charger which features adaptive charge technology, and a high speed 16A AC transfer switch in one single unit. This makes the MultiPlus ideal for applications with limited space, and allows you to have a more compact and easy-to-troubleshoot system, especially since using the MultiPlus will require less cables compared to using separate units (i.e.,