It is not quite that simple and you may not have enough information to
determine this. IF you know the current that the battery can draw at
bulk charge phase then you can look up the voltage drop caused by using
such small wire to carry that current. Here is one place you can enter
your info and it will tell you the voltage drop.

http://genuinedealz.com/voltage-drop.html

Mark

Taeke Takeon wrote:
> I am looking to charge a 220AH house battery bank, mainly from the stock 90A
> alternator and very, very seldomly shore power.
>
> http://www.yandina.com/c100Info.htm I have one of these and am currently
> (ho-ho!!!) second guessing my decision to use this item.
>
> The people at yandina say that the 4 feet of 10 ga wiring will barely slow
> down the amperage into the battery, like a 1/2 of a percent the rate of
> charge.
> Is this too good to be true?  I don't know enough to say for sure.
>
> Thanks.
>