Originally Posted by profundus-sanus

yes that would be fine. the current will take the path of least resistance so if your running 500a through 1 cca and 1 ofc 1/0 the cca will be around 200a and the ofc would be carrying 300a. Thats just a estimate, but the figures would likely be close to that.

Originally Posted by gtr125

does anyone know if it would be ok 2 mix cca 2/0 with ofc 2/0 thanks

Originally Posted by gtr125

ok thats great ill prolb add a 2nd alt later

Originally Posted by profundus-sanus

with 1 220a alt, yes.

Originally Posted by profundus-sanus

oh okay, didn't realize you were doin multiples in the back.

here's my general rule of thumb for wire requirements front to back runs based on 20 ft runs. amperage is the amount of alt power you have.

100a ofc 1/0 75a cca 1/0
125a ofc 2/0 100a cca 2/0
160a ofc 3/0
200a ofc 4/0

that's for 20ft runs. if you're shorter you can stretch it a bit. This is simply to keep voltage drop caused by wire at full load below .5v. If you push 1/0 ofc up to 350a some manufactures rate at you'll see a 1.25+v drop just from wire.

Originally Posted by gtr125

rite now its still a toss up. the weldin cable or cca from kca cable idk. but i got see how much i need. tht is if it stops rainin. (i was thiinkin of 6 smalls xs n the back seein as they are not much more then the napa.)

Originally Posted by profundus-sanus

xs power is worth it imo.

however i'd put the smaller batt under the hood and the bigger batt in the rear.

what did you decide on for wire?

Originally Posted by Beckerson1

Same size wire all the way around

Originally Posted by gtr125

cool cool should i do the alt to battety with the same wire or just1/0 or 4/0?

Originally Posted by Squeezumz

At 25ft it'd be more that 500amp each but it never hurts to have more. The alts aren't always putting out their max too

Originally Posted by Squeezumz

...500 amps at 50ft...

Originally Posted by gtr125

so 2+@2-....no volts drop

Originally Posted by Squeezumz

Yeah but its not tinned. It is rated for like 500 amps at 50ft so thats a plus

Originally Posted by Squeezumz

And what does 3 1/0 gauge look like? I'd just think running 1 is easier than 3. And I guess in your case 2 vs 6.

Originally Posted by Squeezumz

Be cheaper too with that many less fuses and lugs. big bad welding wire

Originally Posted by gtr125

thts mean sh*t i think im going with 2alt an 6run of 1\0

Originally Posted by profundus-sanus

of course 2 alts would be better than one.

i have no clue if you can fit a 2nd alt or not, that's up to whoever is fabbing the bracket for it.

6-phase alts have KILLER idle output, its not the high rpm monster conventional alts people are used too.

normal 270a 6-phase alts will do 220A+ at idle. in the vid below the alt is still doing 100a+ at 250 rpm.

+ YouTube Video

Originally Posted by gtr125

would not 2alt do better the one? but idk if i can fit 2alts my one alt sit rite on top of the motor an it has its on belt.

Originally Posted by Slobalt7

I would think dual alts would give more amps at idle, most high amp alts are like built Supras, nothing at idol but a sh*t ton well above.