Anodes v isolation transformer

[fudd]

Do you need both?

Do anodes last longer or are they unnecessary if you have a transformer?

[Scholar Gypsy]

Yes, they deal with different problems.

 

Galvanic isolators (zinc savers) prevent galvanic corrosion of anodes,zincs ,magnesiums,shafts,propellers & all underwater fittings created by the use of marina shorepower earth connections.Use of mains power in marinas creates an increase of electrical current flowing through the underwater metals leading to deterioration of fittings often resulting in major repairs for the owner!

 

Text lifted from here. Obviously you only need these if you use shore mains power. Not needed if you only use invertor mains.

 

Sacrificial anodes are needed because your propeller and prop shaft are made from different metal to the hull. See here. You need them even if you don't use shore power.

Edited May 25, 2013 by Scholar Gypsy