I am hooking up a 550W car audio amplifier to two marine batteries, how long will the batteries last?

Question

This setup is for a mobile radio with 4 6x9 and a Kenwood 35x4 Car CD player. It ran last year for about 20 hours with the 2 batteries and no amp. I just want to see if anyone can give me a guess as to how long it will last with the 500W amp.

Answer 1

I would guess 20 to 30 minutes, but it really depends on many factors like volume ect....

Maybe ask someone at Batteries Plus ( http://www.batteriesplus.com ), they might be able to come up with a better estimation.