![]() ![]() ![]() But any time that boat is plugged into shore power at a dock, those anodes, which are connected to the boat's grounding system, are also contributing to the corrosion protection for all the other boats plugged into that same dock sharing the same green wire. ![]() This is all well and good for a boat isolated from the dock and stored on a mooring. To help mitigate damage from this natural electrochemical reaction, a typical boat will have sacrificial anodes installed to corrode rather than the metal in the galvanic cell. In this cell there will be winners and losers in the form of unwanted metal corrosion of the less noble metal in the cell, which is unfortunately often expensive underwater metals such as aluminum outdrives. This creates a natural phenomenon known as the galvanic cell. The issue for boats plugged into shore power is that each one is electrically connected to every other one in the marina via the system's grounding conductor - the green wire. In that same article I also identified some of the shortcomings of the transformer, namely weight, heat generation, and cost. It basically eliminates any hard-wire connection between the dockside AC power system and the AC power system on board your boat while still maintaining electrical power and enhanced integrity all achieved by employing the principles of magnetic induction. In the article " How To Control Electrical Flow On Your Boat", I explained the function of an isolation transformer in a shore power system. ![]()
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