Originally Posted by a64pilot
I hang a "Guppy" anode often, but it's purpose is a as a witness, if it ever starts getting eaten up, then I know something is going on and I need to investigate, it is not to replace a prop of shaft anode, I have both, if anything I may be a little over zinced.
Not possible to "over zinc" because the voltage present is a function of the relative nobility of the materials present and maybe the details of the electrolyte solution they are in.
Except under limiting conditions (*under* zinc'd), the quantity of zinc will not impact the voltage present. So the current
will not be affected. So the corrosion
will not be affected.
At least that's how I understand it.