Do I need a battery to power the OutBack Power FM80-150VDC, or can I connect it directly to an inverter? Posted by Frank Molina, Stellavolta on Aug 30th 2018 The OutBack Power FM80-150VDC Charge Controller does not come with a battery and requires an external power source to power up, such as a sealed-lead acid battery in your battery bank. Charge Controller FM80-150VDC OutBack Power sealed lead acid battery sealed-lead acid battery sla solar battery