I have a 2006 larson Lxi 5.0 Volvo penta GXI f with SX OD. I also have one battery, a Clarion CMD4 head unit, external XM Sirius unit and antenna, amp, 4 speakers, and a powered bazooka tube.
Normally I can run the stereo on accessory without issues. If the battery gets low, I have a portable...