2 alts vs 1 big one

[gtr125]

im lookin at getting 2 alts (220ah 125at idle) there r the mechman hybrid Universal fit there 299 on ssa. an the other would be a custom built 350 frm mechman.

[Darkmage1991]

i would personally do 1 big one just cause its less wiring needed. as far as performance it would be the same 2 would more than likly be a lil bit harder to turn but then again you would most likly not even notice that.

[profundus-sanus]

the mechman 350's don't idle well, unless they've changed them recently. if you can do the duals i would

[profundus-sanus]

if you're looking at the 6-phase 370a unit then that would probably be a better option. the conventional(non 6phase) 350a unit is the one that didn't idle well. 6-phases are monsters though.

[gtr125]

Originally Posted by profundus-sanus

if you're looking at the 6-phase 370a unit then that would probably be a better option. the conventional(non 6phase) 350a unit is the one that didn't idle well. 6-phases are monsters though.

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.

[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.

[gtr125]

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.

that what i was thinkin them dual alt wud give me about 250 ah at idle. and the alts come with ground stud on the case. cud i run one alt to the back bank +&- an one up front. or should i keep it up front

[profundus-sanus]

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.

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

[gtr125]

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.

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

[KingPen]

lol....

[Beckerson1]

Originally Posted by gtr125

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

How about 2 3/0

[Squeezumz]

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

[gtr125]

Originally Posted by Squeezumz

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

ummm ive seen that Wire pretty big it look like the wire goin 2 my house

[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.

[gtr125]

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.

true an thts pure copper rite?

[Squeezumz]

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

[gtr125]

Originally Posted by Squeezumz

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

tht sounds lik a win. so 2+@2- should be good with the dual alts. it should be no volts drop

[Squeezumz]

Originally Posted by Squeezumz

...500 amps at 50ft...

Originally Posted by gtr125

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

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

[gtr125]

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

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

[Beckerson1]

Originally Posted by gtr125

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

Same size wire all the way around

[gtr125]

Originally Posted by Beckerson1

Same size wire all the way around

i got more ?. im looking at 3 diff kinds of battery.
1 the xspower d680
2 the Kinetik HC600
3 the napa commercial battery bat7236 is a 1140 ca 89.75 & batt7238 is 910 ca 82.95
im thinking of getting 6 of each. my amps will be hifi zrx3000 or the massvie n4. my alts are 220ah (125 at 800rmps). which of these battery would be the best to get. if i get the xs or kc ill put a bigger one under the hood xs3400 or kc2400. thanks

[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?

[gtr125]

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?

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.)

[profundus-sanus]

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.)

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.

[gtr125]

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.

so 6 runs (3+ 3-) should do it if i use the cca