i first ran a motorguide 36v on a 97 pantera II w/three batterys all deep cycle group 27,then on an 01 p-III my electronics are a pinpoint graph w/zercom flasher on the console w/a pinpoint on the bow.just out of habit i kill my console electronics while fishing but have never “ran” out of juice during a day of fishing,including running livewells,lights at night or fishing in heavy wind.hope this helps some.