PV and battery voltage check
Use the VictronConnect app, a solar charger display or a GX device to check the battery and PV voltage.
Step 1
If the above step is impossible, use a multimeter in DC mode to measure the battery and PV voltages at the
solar charger terminals.
Step 2
WARNING: Certain solar charger models may have PV voltages up to 250Vdc. Voltages
exceeding 50V are generally considered dangerous. Only a qualified technician should
handle dangerous voltages.
Compare both voltages. Remember that the PV voltage needs to be 5V higher than the battery voltage for
Step 3
charging to commence.
Possible reasons why the solar voltage might be too low:
• Insufficient solar irradiance is reaching the solar panels:
• It is night.
• There is cloudy or bad weather.
• There is shade from nearby objects. See this
• The panels are dirty.
• There are seasonal differences. The sun angle is lower in winter.
• The panels have an incorrect panel orientation or inclination.
• There are issues with a solar panel or the solar panel wiring:
• There is a mechanical or electrical issue with an individual panel (or multiple panels).
• Wiring problems, like loose wires, loose connections or incorrect crimped MC4 connectors.
• Blown fuses.
• Open or faulty circuit breakers.
• Issues with splitters, combiners or incorrect usage of these components.
• Incorrect PV array design or configuration:
• The PV array is misconfigured. For example, there are an insufficient number of panels in a series string.
• Reverse PV polarity:
• The positive and negative PV wires have been mistakenly swapped when connected to the solar charger. For more
information, see the
Reverse battery polarity [50]
8.3.2. Settings being edited on an external display
Charging is disabled when a
MPPT Control
Page 46
MPPT solar charger manual
shading blog story
for more information.
chapter.
external display is used to make configuration changes.
Troubleshooting