what size alt to run 2500rms

[tristan560]

Just keep adding batteries then.

[Neo_frog]

what if your looking for 14+volts?

Then get 14V batteries. Alternators have very little to do with loaded voltage unless your current supply exceeds the demand. Just because you regulate at 14+ doesn't mean you'll see it on a load.

[CNF Kevosinn]

do the big 3, get a nice batt up front, 2 runs of 1/0 to the back and a second batt as big as you can get in the back. this is all stuff you would want to do with an upgraded alt so if you need to get the bigger alt or want to upgrade in the future this gives you a head start

[Boon]

what if your looking for 14+volts?

Then you're shit out of luck, unless you want to spend more on your electrical than your system's worth.

A 300A alt would keep you at 14+ with 2500wrms of output. Maybe.

[fecupe2001]

Depends also on the stock alternator, the smaller it is then the car need less current to work all it´s functions, my stock alt was 70 amps, i only got a 140 amps alternator with 2 batteries and i didn´t drop below 13 volts at the amplifier

If your stock alt it´s something like 60 amps, then with 3000 watts and a couple of batteries, i would say 160 is more than enough!! On the other hand, if the stock it´s something like 140 amps, then yes, i would get around 180 or 200 amps with a couple of batteries and big3

[Flint_810]

watts/volts=amps. use this formula to calculate. typical car draws about 30 amps so be sure to add that in.

and congrats on the btl 18!

i'd appreciate it man but i watin on an 15" tho

[Flint_810]

I have the same size system with a 200amp alt and three batts, works great.

so you got two batts on your BTL?

[Flint_810]

I've ran 5k off of my 250 amp alty...just gvrab yourself a decent 200ish amp alt and a big battery and you'll be fine.

Btw, I grew up in flint. Went to southwestern '03-05.

str8 up man dats whats up where you move to?

[Flint_810]

do the big 3, get a nice batt up front, 2 runs of 1/0 to the back and a second batt as big as you can get in the back. this is all stuff you would want to do with an upgraded alt so if you need to get the bigger alt or want to upgrade in the future this gives you a head start

oh yea that makes sense will do man thanks!!!

[Sactownbully84]

id get at least a 260amp alt i have a DC POWER 260SP and im running a SS xxx4000d on one 18" BTL loaded @ .7ohm and i never drop under 13.5 unless im idle and wangin the hell out the volume but then it goes to 13 at lowest., get a awesome alt then you wont need a bunch of batts takin up space.