help choosing a battery

[antenore]

Hi guys, I have a problem that my audio on a boat only lasts for like 1 hour on 2 normal batteries fully charged.

I need help choosing a right battery for my system. My system is 2 amps with 4 channel each that handles 100 watts rms per channel summing 800 rms and another amp this time 2 channel with 250rms each channel, summing all this would be a total of 1300 rms. The problem is that this system is charged only when I get to shore and connect the battery chargers, so I need help choosing a pair or maybe 3 batteries I don't know that can handle this system for 8+ hours without charging.

What do I need to look for when buying a battery?

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[adulbrich 5,000+ posts]

Look at ah (amp hour ratings)

 

[antenore]

ok, how much ah should I look? Is there a calculation to know based on you wattage how much Ah you need?