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dmz2711

alt/battery determination

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Is there a way, such as a calculation, or some type of rule of thumb to determine what alternator, as well as how many batteries it will take to run a certain system? Are there any guidelines to determine these values? For example, lets say i have a 5000 watt system, can i plug that into an equation, or some sort of outline to determine what size alternator i would need, and how many batteries i would need? or if i wanted an 8000watt system, same thing.... Is there a rule, like for every 1000watts you need a certain amount of amps within a battery? :blink: I am not trying to figure anything out for myself, I am just askin for basic knowledge to see if there is an easy way to determine this (mostly about the extra batteries part), thanks in advance!

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Divide the total number of watts going to your subs by the number of volts (12-13).

That will give you an approximation for the number of amps required from your alternator.

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The people from rockford fosgate said for every 1,000 watts your alternator needs to pump out at least 70a. If you find out some info on a good alternator brand that will do atleast 250a, let me know. I keep on asking in a couple of different forum and get no help :(

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