If your boat uses shore power, galvanic corrosion could be eating away at your hull long before the next blacking or survey. And the chances are that you’d never know – until it’s too late.
Linked through the marina earth, your boat’s steelwork, anodes and underwater fittings can be exposed to tiny voltage differences that accelerate pitting, anode wear and steel thinning. Surveyors see the damage all the time – and the repair bills can be eye‑watering.
A galvanic isolator is a compact device fitted in the shore power earth that blocks those low‑level DC currents (around 0.4–0.8 V) while still allowing full‑voltage fault currents to flow so your safety systems work exactly as they should. In practice, that means your anodes last longer, your hull and prop stay better protected and you reduce the risk of costly replating later on.
You can choose a plug‑in galvanic isolator that simply fits in line with your hook‑up lead, or a hard‑wired unit installed into the boat’s AC system. Once fitted, it’s a “fit and forget” solution that quietly works every time you plug in. Protect your narrowboat and your wallet – fit a galvanic isolator before the next season on shore power.
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