Galvanic isolators might sound pretty technical at first glance, but the truth is they’re straightforward, practical bits of kit that are easy to understand and even easier to install.
So here’s what’s going on behind the scenes.
A Galvanic isolator’s job is to block the tiny stray electrical currents that would otherwise travel along your shore‑power cable and slowly nibble away at the metalwork on your boat over time. This unseen “metal‑eating” process is what we call Galvanic Corrosion, and it can quietly attack hulls, stern gear and other fittings while everything appears to be working normally.
Importantly, Galvanic corrosion is not a sign of dodgy or unsafe electrics.
It’s caused by a natural chemical reaction between the different metals on your boat and their surroundings, which means any boat that regularly plugs into an electric hookup can be affected, whether it’s a small cruiser or a live‑aboard in a marina.
The reassuring part is that, despite the science‑y name, those troublesome Galvanic currents can be stopped very easily.
A Galvanic isolator simply plugs in line with your existing electric hookup cable, acting like a protective barrier without changing how you use your shore power day to day. It’s been designed specifically so you don’t need an electronics qualification – or even a toolbox – to fit it; there’s no wiring to figure out, no panels to remove, and no holes to drill.
In practice, installing one feels just like connecting an ordinary extension lead…. You plug it in, connect your cable, and you’re done. No screwdrivers, no complex instructions, and no specialist installer required. It’s genuinely a “plug it in and forget about it” solution that anyone can handle with confidence.
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