Pre-Purchase Boat Survey: The Electrical Side

Buying a used boat? Our pre-purchase electrical survey gives you a written report before you commit. It looks only at the electrics: batteries, charging, shore power, wiring, distribution and the equipment the seller says is working. Hull, engine and rigging belong to your general surveyor; this survey sits alongside that report and fills the gap most of them leave.

A general pre-purchase survey will usually note that the electrics "appear to function" and recommend a specialist inspection. That line matters, because rewiring, a new battery bank or a replacement charger can change what a boat is really worth to you. An electrical survey turns the vague line into specific findings you can act on.

We carry it out aboard, where the boat is lying within our usual South Coast area, by arrangement with the seller or broker. You get a clear account of what we found and what it would mean in practice, so you can negotiate, budget or walk away with your eyes open.

What we check before you buy

The survey follows the power from where it is stored to where it is used, and checks the protection along the way.

Signs that make an electrical survey worth having

Some boats give themselves away. A tangle of extra wires behind the panel, blocks of terminal strip in a locker, a battery charger with no obvious fuse, or a mix of new lithium batteries and an old charger all point to a system built up over the years. None of these is a reason not to buy on its own, but each is worth understanding before you agree a price.

Ask the seller for any paperwork on recent battery, charger or Victron work. Model labels and dates help us judge whether newer equipment has been set up for the batteries it charges.

What the written report gives you

The report sets out what was tested, what worked, what did not, and what we would treat as a safety issue rather than a matter of tidiness. Where something needs work, we say so plainly. If you go ahead with the purchase and want the issues put right, we can quote for that work separately.

We cannot see behind linings or inside sealed equipment, and some faults only show when the boat is underway. The report notes those limits so you know what was and was not possible on the day.

Our full marine electrical survey service · What a pre-purchase electrical survey covers

Arranging a survey on a boat for sale

Tell us the make, model and year of the boat, where it is lying, and how access will be arranged with the seller or broker. Shore power on the day makes the charger and AC checks far more useful, and fully charged batteries help us test them properly. If the boat is ashore, let us know, because some checks need it afloat or connected.

If the survey shows the electrics need attention, our boat rewiring and lithium battery pages explain what that work involves, so you can weigh it against the asking price.

Boat rewiring · Lithium battery upgrades

Frequently asked questions

Is an electrical survey part of a normal pre-purchase boat survey?

Usually only briefly. A general surveyor often checks that things switch on and recommends a specialist look at the electrics. Our survey is that specialist electrical inspection.

Do you survey the hull or engine?

No. This is an electrical survey only. Use a general marine surveyor for the hull and structure, and an engineer for the engine.

Do I need the seller's permission?

Yes. The survey is arranged with the seller or broker, who needs to allow access aboard and, ideally, have shore power available on the day.

Will the report help me negotiate?

It gives you specific findings rather than guesses, which you can discuss with the seller. What you do with it is up to you.

Buying a boat? Book the electrical survey first

Send the boat's details, where it is lying and the seller's access arrangements, and we will come back with the next step and a written quote.