In This Article
The Mediterranean sailing season starts in earnest around April and runs through October. After months of winter layup, your yacht’s electrical systems need careful inspection and preparation before that first summer sail. Rushing this process leads to mid-season breakdowns, spoiled provisions from dead refrigeration, and dangerous situations with failed navigation equipment at the worst possible moments.
Pre-Season Battery Health Check
Begin with your batteries. Measure the resting voltage of each battery bank with a quality multimeter. For 12V lead-acid or AGM batteries, anything below 12.4V indicates significant discharge and possible sulfation. For lithium batteries, check the BMS status through the battery’s monitoring app or display.
Charge all batteries to 100 percent using a proper marine charger with the correct profile for your battery chemistry. Then perform a capacity test by running a known load and measuring how long the battery sustains it. Batteries that have lost more than 30 percent of their rated capacity should be replaced before the season.
Clean all battery terminals, apply dielectric grease, and check that all connections are tight. Verify that your battery charger and solar system are functioning correctly by monitoring the charge current and voltage profiles during a full charge cycle.
Getting Your AC System Summer-Ready
Test your shore power connection by plugging in and verifying voltage at the main panel. Check for correct polarity using the panel indicator or a plug-in tester. Inspect the shore power cable for any cracking, discolouration, or corrosion on the pins — replace damaged cables immediately.
Test your RCD (residual current device) using the test button. If it does not trip, replace it before sailing. Test your inverter by disconnecting shore power and verifying that AC outlets work on battery power. Review our shore power safety guide for a complete AC system checklist.
If your yacht has air conditioning, run it early in the season to check compressor operation, refrigerant levels, and seawater pump flow. AC problems are much easier and cheaper to fix in the marina than during a heatwave in July.
Navigation Electronics Pre-Season Check
Power on all navigation electronics and verify GPS acquisition, chart display, and touchscreen response. Update your chartplotter software and charts to the latest versions — Navionics and C-MAP release frequent updates with new depth data and marina information for Greek waters.
Test your VHF radio on a low-power channel with a nearby vessel or marina. Check AIS transmission by verifying your vessel appears on MarineTraffic.com. Verify radar operation at the dock — it should paint clear returns from nearby structures. Test your autopilot by running it in standby mode and verifying heading data is correct.
Check all antenna connections and cable runs. Winter moisture can degrade coaxial connections, causing reduced range and intermittent faults that are frustrating to diagnose at sea. If any electrical issues appear during testing, resolve them before departure.
LED Lighting: Upgrade Before You Sail
If you still have halogen or incandescent bulbs on board, the start of the season is the perfect time to switch to LED lighting. LEDs reduce your lighting power consumption by 80 to 90 percent, run cool to the touch, and last for years without replacement. The reduced power draw extends your battery life significantly during anchor nights.
Test all navigation lights: port, starboard, stern, masthead, and anchor light. Replace any dim or failed bulbs. Navigation light failure at night is both dangerous and illegal. Modern LED navigation lights draw minimal power and provide excellent visibility.
Check your interior lighting for any flickering, which indicates loose connections or failing LED drivers. A complete LED lighting upgrade is one of the most cost-effective improvements you can make to your yacht.
Safety Equipment Verification
Test your bilge pump by manually triggering the float switch. Verify both the automatic and manual override functions work. A failed bilge pump during a Mediterranean thunderstorm can sink a yacht surprisingly quickly.
Check smoke and CO detectors — replace batteries if they are not hardwired. Test your fire extinguisher pressure gauges. Verify that your emergency electrical systems work independently of the main battery switch, including the bilge pump, fire detection, and VHF radio.
Inspect all emergency lighting, if fitted. Many newer yachts have low-voltage LED strip lights in companionways that operate on a separate emergency circuit. These should be tested annually as part of your seasonal maintenance checklist.
Professional Commissioning Service
A professional pre-season commissioning covers all the checks above plus insulation resistance testing, earth continuity verification, and thermal imaging of distribution panels under load. This level of inspection catches problems that visual checks miss — like a connection that looks tight but has high internal resistance that will fail under load.
At A Yacht Marine Services, we provide thorough spring commissioning services for yachts of all sizes across Athens, Piraeus, Attica, and the Greek islands. Start your sailing season with complete confidence in your electrical systems. Contact us to book your pre-season inspection.
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