[Rhodes22-list] Galvanic corrosion

[Robert Skinner]

Mark Kaynor wrote:
> ...
> Now that we've got the Tayana and have her docked at a marina w/ water and
> electricity, and have sacrificial zincs to maintain (everywhere, it seems),
> I've decided to install a galvanic isolator on our incoming AC ground.
> ...
> We$t Marine has a 30A Guest w/ monitoring for $240. I just ordered one on
> eBay, same thing, new, for $133. We'll see how it goes.

Mark -

Please pardon my ignorance.  I'm truly in over my
head here.

I need some help understanding why you wouldn't 
use an isolation transformer on the dock to remove 
all DC paths to shore power, setting up a separate
ground within the boat's own circuitry to avoid
boat-to-shore loops.  

Or is that what you are actually doing but under 
another name?

Thanks for input from Mark or any other with 
knowledge in this matter,
-- 
Robert W. Skinner CDP, "Squirrel Haven"
9 Gateway Commons, Gorham, ME 04038-1331