How big of an alternator do i need?

[Tarball]

You could try the stock alt to begin with and go from there. Get a volt meter to install and see what it does.

There is no way a stock alt +big 3 is going to keep up with what he is trying to run.

[ShadeTreeMechanic]

I know stock alt won't be enough but it will buy some time while he saves up for what's needed.

[Copper07]

Thanks for all the replies guys!

I would say no less than the 270 hairpin from singer. The amps you will be running are inefficient, and will require to have that extra power on tap in order to perform at their best.

But if you want to go with the bare minimum, add up the Fuse ratings of the amps, and add another 60amps, and that's how much alt you should have.

Wait, why are they inefficient? I thought class D was most efficient? I mean, i know Power Acoustik isnt a great name, but it isnt bad. As for the stock alt comments, im running the 5 channel rn off the stock alt, only running the sub channel to two sa8v2s(which bang like crazy btw), and i read minimal voltage drop at idle, sitting in a parking lot, but I did notice that when I was driving at night, my lights dim ever so slightly, so i know once I put the speakers on the other four channels, and the other amp in, stock wont be enough. As for adding the fuse ratings together, they both have 2 40 amp fuses, so 160 total, plus 60, that gives me 220. Ill add another 20-30 to be on the safe side, so say 240-250 amps. So could I go with 250 hair pin, or the 275 normal?

[reedal]

Class D is the most efficient in terms of class, but it's more than just the class that determines efficiency of the equipment. Like most budget amps, power acoustik is not known as a quality brand that does its power claims accurately. I'm sure that with more amperage on tap for those amps to pull they'll be more likely to put out RMS assuming voltage doesn't drop below the 14.4v rating that the amps were probably tested at.

[Copper07]

Ok that makes sense, i agree with that, pretty much figured it when i bought them lol. What about the rest of my last question?

[MrSkippyJ]

Hairpin

[reedal]

250 hairpin

[Copper07]

Alright, thanks guys. Definitely going with either the 250, or 270 hairpin. Is there any advantage to powder coating it? Or is it just because it looks cool? lol

[magillaru]

Get the 270.....it's a monster at idle.

Powder coating can help protect it from the elements.

[Kyblack76]

Loved my 270 hair pin.

Ran cases from 225 to 370. 3 and 6 phase. Conventional and hair pin. That 270 was a bad ass alt. Puked out 225 hot, idle all day errrryday.