Question about power.

[Daytomann]

Got a real NOOB question for you guys... :|
I am adding a 850 watt amp to my boat this week. This will be in addition to my 350 watt amp that came with the boat. Will I need to add another battery or install an alternator upgrade? Or will I be ok the way it is?
I have a 2004 216 TE.

THANKS!!

[clubmyke]

you should be okay...

would suggest 2 optima gel top batteries though... can be had at costco for $130-ish..