There is a reason marine chargers are more expensive than automotive
chargers, they are ignition-protected, and have ground isolation to
prevent stray AC current from leaking to ground(DC) and causing
galvanic corrosion and rapid zinc consumption.....cheaper is not a good
reason to use an automotive charger, It's OK for a trailer boat in your
driveway, but on an in-water boat it can be detrimental to your u/w
hardware and an explosion hazard! As for the "desulfate" feature,NEVER
use it on any battery other than a flooded wet acid battery or you'll
destroy it...a good charger also monitors temperature to prevent
damage.
Lastly,for the person who posted about the RF noise, I bet the people
in your marina just love having you for a neighbor....Best to save the
auto probucts for the autos...