Before you start
Gather the appropriate supplies and review the specific equipment manual.
- Solar controller history
- Weather notes
- Battery monitor
Step-by-step instructions
Record watt-hours for each controller
Use daily energy production rather than only peak momentary wattage.
Note the environmental conditions
Document cloud, shade, boom position, rain and season.
Compare to loads
Add refrigeration, communications and inverter consumption for the same 24-hour period.
Look for consistent differences
Repeatedly low output from one array may point to shading, a connection fault or mismatch.
Set a realistic baseline
Compare several similar days and investigate large unexplained changes.
Safety note
Do not diagnose or modify live panels while collecting routine production data.
Key takeaway
Daily watt-hours show whether the system actually supports the way you live aboard.
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.