Before you start
Gather the appropriate supplies and review the specific equipment manual.
- Charge-controller manual
- Built-in controller display
- Solar generation history
Step-by-step instructions
Check the conditions
Confirm daylight, shading, state of charge and whether the battery is already full.
Read controller status and alarms
Use the app or display to record battery voltage, PV voltage, current and fault messages.
Review configuration
Confirm battery chemistry, charge voltage and any lithium BMS restrictions are correct for the actual battery.
Look for obvious external causes
With no live wiring exposed, look for shadowed panels, damage, corrosion or a tripped protective device.
Escalate persistent faults
If PV voltage is abnormal or connections require testing, stop and have a trained technician safely isolate and test the circuit.
Safety note
PV strings can remain energized in sunlight. Do not unplug solar connectors under load or touch exposed conductors.
Key takeaway
Controller status codes help distinguish a genuine fault from a fully charged battery.
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.