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I would like suggestion I have 2500 watts system in my boat. 8 speaker and 2 10 inch sub. Looking to upgrade my battery. I currently use 2 in paralel for my system. What good battery you guys recommend that woukd last all day?.
 

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I would like suggestion I have 2500 watts system in my boat. 8 speaker and 2 10 inch sub. Looking to upgrade my battery. I currently use 2 in paralel for my system. What good battery you guys recommend that woukd last all day?.
How many watts, or amperes, does your 2500W system draw?
It is probably not 200 amps... But if it was... then 100 amp hours / 200 amperes = 1/2 hour.

So you probably need to know the actual current draw.
And you probably need to make sure that you have enough reserve left to start the boat.

Running a bandpass or at least a ported sub will likely double your available time. And having low listening levels would also help.
 

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I always recommend an ACR. I run 2 group 34s in parallel for my houyse side, and a group 34 for my starting side.

I just bought Duracell from Sam's club and have been very happy with them. They have fscier agm ones too.
 
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