Quick feeder wire gague / subpanel question

[Manitoid]

So i am running a subpanel in my garage, from my meter/main panel.

The run is 325 ft. I was hoping to run 100A, but was told the maximum run on 100A (with 4/0 alu.) is 290ft.

So I will be running 80A.

to carry 80A 325ft, what size wire do i need?

I was told 4/0 aluminum... but that seems huge. I do not think the breaker in my sub will even take it?

any thought filled insight will get +K in appreciation.

Thanks
Manitoid

as an update... this website http://www.vihon.com/Vihon_Calculat...lculator/body_vihon_wire_gage_calculator.html

using 24000 W (100A) and 325ft and allowable drop of 5% gave me a gauge of 0... which is way different than my friend's assessment of 4/0 (OOOO, or "four Aught") and that i could only run 80 amps on 4/0 if over 290 ft... any help clearing the fog would be appreciated!

 

[Manitoid]

update #2:

using http://www.alternate-energy.net/voltlosscalc03.html which seems way more expansive...

inputting 240V 1 phase 80A 325ft distance and 3% Voltage loss it gave me

2/0 aluminum...

so I am assuming the first calculator was for copper.

I am thinking 2/0 is the answer and not 4/0...

anyone?

 

[Tilt]

copper will be a smaller gauge than aluminum. If you use aluminum apply NO-OX to your connections. using that cool calculator you posted I came up with #1 copper and 2/0 alum.

 

[FlyinHawaiian]

I think 2awg is only rated up to 90 amps now, and this is for short distances, soo i think u need 1awg but don't quote me on it

 

[Tilt]

4/0 is definately too large to fit under most 100 amp breakers.

 

[Manitoid]

will 2/0 fit under most 100A breakers?

 

[cocktail frank]

4/0 Al is good for 200 amps (not at that footage tho)
depending on temp rating on your breaker, u can do 100A using 3awg Cu standard.
general rule of thumb for me is to derate 1 size per 150'.
other factors can change this rule of thumb, but being your only running one set of feeders, you're good w/ 1awg Cu