how many batteries per sub should i use?

Question

i have 5 "13 in. JL-W7"
all gonna be runnin on 1000 wat amps
what would you recommend

i was thinkin 1 per sub, is that a good idea ?

Answer 1

OKAY. Basic electronics, here.

Volts X Amps = Watts

You say you've got five 1000W watt amps pushin your subs. That's 5000watts of power that you've got to supply using a 12 volt system.

Take your power requirement (5000 watts) and divide it by your supply voltage (12 volts) and you find that your amplifiers will need to suck up 416.7 amps of current in order to provide the full 5000 watts of power at 12 volts. Working it backwards:

12V X 416.7A = 5000W

See how it works?

Now, if you're running a pair of 250Amp alternators, as a previous post suggested, you'll have 500Amps of total current available, even with your amplifiers running wide-open, which is more than enough for your audio -- IF your car is running. IF, however, like many people, you plan to pump up the jam for long periods of time while your car is parked, with the engine turned off, those big alternators aren't going to be much help; ALL of those 416.7 amps of current are going to get sucked out of your battery system. Well, that's a lot of juice to ask from one battery; demanding that from a 12 volt car battery for any appreciable length of time would likely overheat it, causing the internal plates to deform and short out, effectively killing the battery.

You're very well advised to go with a dual battery system AND get deep-cycle marine/RV batteries that can deliver that kind of current without overheating. The idea, here, is to spread the current load between more batteries so they can deliver it without heating up, but, even with that, you'll still be better off to keep the engine running whenever it's practical to do so.

BTW: Don't forget to keep some $$$ aside for an alarm system to protect all of this gee-whiz audio. ;-)

Answer 2

IMO I think that a single high output alternator and 2 *extra* batteries of deep cycle nature should be sufficient. You might be able to get away with a single extra battery, but I don't think so.
As far as amplification goes, a single high powered amplifier might work out better than having multiple smaller amps.

Answer 3

You will need at least one (maybe two) 250 amp alternators and two deep cycle batteries with battery isolator.

No, one per sub won't be able to be charged by your stock alternator.

Answer 4

you need an isolator to charge all battery systems but it will leave the one for the auto to start it but get a cop car alternator it may work

Answer 5

two good batteries and a ver large capacitor