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.