| The Optimax motors require 1000 MCA, or Marine Cranking Amps. If your battery is rated less than this, replace it. Group 24, 27, or 31 doesn't matter, if you don't have the minimum MCA.
I would look to a dual purpose battery, if you are running all those, plus the livewell all day long. Also, I would recommend charging everytime you come off the water.
I'm pretty sure the battery is just not up to the task.
i had the same issue last year (Interstate battery, 200hp Opti, console combo unit, bow gps and bow sonar, cell phone charger). it would mostly happen at the end of a day of fishing when the gps/sonar units had been running all day long and when i fished into the night and had my boat lights turned on.
nothing the matter with the wiring, the electronics, or with the battery per se, that's just a lot of stuff draining the battery down all day and a big demand to crank up the main motor; go to start it and the draw would shut everything else down due to lack of power. my console unit was even nice enough to give me a "low voltage" message each time before it turned itself off...which started to seem a bit sarcastic to me by the end of the year. 
i adapted to it by only running whichever set of electronics i needed (bow or console) at the time, running my big motor for a bit before dusk/night fishing to get some charge to the battery, and by turning my running lights off briefly before starting the motor up.
this year i'm just going to make sure it's got a battery that's more up to the demands that the larger electronics are putting on it.
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