Good Ol' Days › Quiet at Anchor

The charter where the generator does not run all night

On most crewed catamarans, air-conditioning at anchor means a generator running under your cabin until morning. This one runs the night off batteries.

The problem nobody mentions in the brochure

Every crewed catamaran in the Caribbean advertises air-conditioning. Far fewer explain what keeps it running once the engines are off. On a conventional boat the answer is a diesel generator, and at anchor it runs through the night — which means a low drone through the hull, a vibration in the aft cabins, and a faint smell of exhaust depending on which way the boat lies to the wind.

Guests who have chartered before know this and have usually made peace with it. Guests who have not are surprised by it on the first night, somewhere around two in the morning.

How the hybrid system changes the night

Good Ol' Days carries 3.28 kW of solar across the hardtop feeding a 40 kWh house battery bank. The panels charge all day while you are sailing, swimming and eating lunch. At anchor the stored power runs the whole boat — air-conditioning in every cabin, lights, refrigeration, the water-maker and Starlink — without the generator.

The practical result is that you hear the water against the hulls and nothing else. It is a small thing on paper and a surprisingly large one at anchor in a quiet bay off Anegada.

What we do not claim

She is not a silent boat in some absolute sense. There is a cooling fan, and it is audible if you stand next to it. The generator exists and it does run — for heavy loads, for long stretches of cloud, and to keep the bank healthy. The honest claim is the useful one: air-conditioning all night, in every cabin, on batteries, without a generator running while you sleep.

Why this matters more on a seven-night charter

One noisy night is an anecdote. Seven of them is the difference between coming home rested and coming home needing a holiday. The groups who care most about this are the ones with light sleepers, with small children who wake easily, and with anyone sleeping in an aft cabin — which on a conventional catamaran is directly above the machinery.

The rest of the system

Electric drives mean the boat also moves quietly under power, which changes short hops between anchorages and makes the approach into a crowded mooring field notably less dramatic. The solar also means the water-maker and the ice run without anyone rationing them, which is the other thing that quietly shapes a week aboard.

See the yacht in detail, including her deck plans and the hardtop solar array, or what a week costs.

Common questions

Can you run air-conditioning on a catamaran without a generator?

On a hybrid solar-electric catamaran, yes. Good Ol' Days runs air-conditioning in all five cabins overnight from a 40 kWh battery bank charged by 3.28 kW of solar, so the generator does not need to run while you sleep.

Do charter catamarans run the generator all night?

Most do, because a conventional boat has no other way to power overnight air-conditioning. That is the drone and vibration people notice in the aft cabins. A hybrid boat with a large battery bank avoids it.

Is a hybrid-electric catamaran actually silent?

Not absolutely. There is a cooling fan, and the generator still runs for heavy loads or long cloudy stretches. The accurate claim is air-conditioning all night, in every cabin, on batteries, with no generator running overnight.

Does solar really generate enough power for a week aboard?

In the Caribbean, yes, for the overnight hotel load. The panels charge through the day while the boat is sailing and at anchor, and the bank carries the night. The generator is backup rather than routine.