Solar panels on a houseboat: what matters for fitting, storms and fire

More and more houseboats and liveaboard barges carry solar panels on the roof, the deck or the rails. They keep the batteries topped up, take load off shore power and make the boat more independent. Too often, though, they are fitted the way you would fit a garden shed: panels on simple rails, cable from the DIY store, a charge controller tucked away in a cupboard. On the water there is damp, constant movement and, on a houseboat, a large flat roof that sits fully exposed to the wind.

Two kinds of damage come up again and again. In a gale a panel behaves like a wing, and a mounting that cannot take the load tears out, damages the roof and can hit a neighbouring boat. The second starts quietly: a damp connector, a cable that is too thin or an overloaded charge controller warms up, and warmth becomes a smouldering fire, usually somewhere nobody looks. A large battery bank, especially lithium, raises the stakes. How such a loss is settled depends on the policy and often on whether the system was declared and properly installed.

Have the system fitted by someone who knows marine electrics, and keep the invoice. Bolt the panels down through a sound substructure so the wind cannot get underneath, and check the brackets after every storm. Use cable and connectors rated for outdoor and marine use, fuse every string, and put the charge controller and batteries somewhere ventilated and easy to reach. A smoke alarm in the plant space costs very little. And tell your insurer about the system and its value, so it is reflected in the sum insured.

Worth remembering

Have it fitted properly, keep the invoice and declare its value.