Before you start
Gather the appropriate supplies and review the specific equipment manual.
- Camera
- Controller energy history
- Deck sketch
Step-by-step instructions
Make a simple panel map
Draw the panels and note which controller or string each panel feeds. Include the boom, backstay, antennas and canvas.
Observe at several sun angles
Photograph shade patterns early, midday and late in the day while the boat is safely anchored or berthed.
Record daily production
Compare energy data, not only peak watts, and note whether the boat was swinging or sailing.
Match shade with wiring groups
A shaded module may affect more of a series group than a parallel arrangement, depending on module and controller design.
Evaluate changes safely
A new boom position or equipment location may help, but never compromise safe sail handling or change PV wiring without a reviewed design.
Safety note
Do not shift booms or climb on a solar arch in unstable conditions. PV connectors remain live in daylight.
Key takeaway
A simple shadow log can explain charging losses that look like controller failure.
Keep this job on your maintenance schedule
Save the topic as a maintenance task, choose a due date or engine-hour target, and record future service. Free and stored on your device.
Add to my maintenance plannerThis guide is for general education. Follow your equipment manufacturer’s instructions, current navigation guidance and applicable marine safety standards. When uncertain, use a qualified marine professional.