Marine air conditioning is an AC load, so whether it works well depends on the electrical supply behind it: enough shore power or generator capacity for the start-up surge, correctly rated cable and protection, and a seawater pump that is wired and fused properly. We install, check and fault-find that electrical side.
Air conditioning aboard is a heavy, continuous load. A typical unit draws a few amps once running, but the compressor asks for several times that for a moment at start-up. On a 16-amp shore post that is manageable; on a weaker pontoon supply, or through a small inverter, it is often the reason the system trips or refuses to start.
The unit itself is only part of the picture. Seawater cooling depends on a pump, a strainer and flow, and the controls rely on low-voltage wiring that lives in damp spaces. When owners describe a unit as broken, the cause is frequently electrical rather than a failed compressor.
Before anything is fitted, add up what will run at the same time: air conditioning, water heater, battery charger, cooking. That total has to fit within the shore supply you usually connect to, or within the generator's output. If it does not, the system will trip at the worst moment.
Soft-start devices reduce the compressor's inrush and can make the difference between a unit that runs from a modest generator and one that does not. Where a Victron inverter/charger is fitted, power assist can briefly top up a limited shore or generator supply, which helps with occasional peaks.
It can, but the numbers are demanding. Running air conditioning through an inverter overnight needs a large lithium bank, an inverter rated for the start-up surge and a way to recharge it all the next day. For most boats it makes more sense on shore power or a generator, with batteries covering short gaps.
Each unit needs its own correctly rated circuit with overcurrent and RCD protection, cable sized for the full load and voltage drop, and clean terminations away from condensate. The seawater pump should be on its own protected feed or relay as the manufacturer specifies, so a seized pump trips a breaker instead of overheating a cable.
A breaker that trips a few seconds after start-up points to inrush or a supply at its limit. A unit that runs but blows warm, then shuts down, often has a pump or flow problem the controller is protecting against. Intermittent control faults are usually corroded connectors or a low-voltage feed with a poor joint. Refrigerant work is a specialist trade; if testing shows the electrical side is sound, we will say so.
Usually the start-up surge plus everything else running exceeds the supply. Reducing simultaneous loads, adding a soft start or improving the supply are the usual fixes, after testing confirms there is no wiring fault.
Yes, if the inverter can handle the start-up surge and the battery bank is large enough, but most boats run it from shore power or a generator.
No. We cover the electrical supply, protection, pumps and controls. If the fault is in the refrigerant circuit, a specialist is needed.
Yes. We plan the circuit, protection and pump wiring and check that your shore supply or generator can support it before quoting.
Tell us the boat, the unit and what it is doing. We will come back with timing and a written quote.