Product Manual

VictronConnect charger enable/disable setting
9.2.6. PV voltage too low
The solar charger will commence charging when the PV voltage is 5V higher than the battery voltage. Once charging has
commenced, the PV voltage must remain 1V higher than the battery voltage for charging to continue.
Check the PV and battery voltage
WARNING: Depending on the solar charge controller model, the PV voltage can be up to 250Vdc. Voltages
above 50V are generally considered to be dangerous. Check your local electrical safety regulations as to the
exact regulations. Dangerous voltages can only be handled by a qualified technician.
1. Use the VictronConnect App, a solar charger display or a GX device to check the battery voltage and PV voltage.
2. In case the above step is not possible, measure the battery and PV voltages at the solar charger terminals using a multi
meter instead.
VV
3. Compare both voltages, the PV voltage needs to be 5V higher than the battery voltage for charging to commence.
Causes of zero or low PV voltage:
Not enough solar irradiance into the solar panels:
• Night.
• Cloud cover or bad weather.
• Shading – see this shading blog story for more information.
• Dirty panels.
• Seasonal differences.
• Wrong orientation and/or inclination.
Problems with a panel or panel wiring:
• Mechanical or electrical issue with an individual panel (or multiple panels).
• Wiring problems.
• Blown fuses.
• Open or faulty circuit breakers.
• Splitters or combiners issues, or these are used in an incorrect way.
PV array design issues:
• Solar array configuration mistake - not enough panels in a series string.
• Wrong panel types - 12V solar panel and a 24V battery bank.
Reverse PV polarity:
• The positive and negative have been swapped when connected to the controller, read next paragraph: “Reverse PV polarity”.
MPPT solar charger manual
Page 42 Troubleshooting and Support