The solar charger stops charging if the PV voltage exceeds the maximum rated PV voltage. At the same time, it will display an
overvoltage error #33, and will fast blink its absorption and float LED.
Charging will not recommence until the PV voltage has dropped 5V below the rated maximum voltage.
When investigating a high voltage issue, also look at the history of the VictronConnect app, solar charger display or GX device.
Check the highest PV voltage for each day (Vmax) and also look for past overvoltage warnings.
VictronConnect: screenshot of an Error #33 and a screenshot of the history indicating an error
Check the open circuit voltage (Voc) rating of the PV array. Ensure that it is less than the maximum rated voltage of the solar
charger. Use the MPPT sizing calculator on the solar charger product page. In case the PV array is located in cold climates or if
the night temperature drops close to or below 10°C the PV array can output more than its rated Voc. As a rule of thumb, keep an
additional 10% safety margin.
An overvoltage event can damage the solar charger, depending on how much the maximum PV voltage was exceeded. This
damage is not covered by warranty.
9.3. Batteries are undercharged
This chapter deals with possible reasons why the solar charger is not sufficiently charging the batteries and the steps you can
take to check or remedy the situation.
Some signs of undercharged batteries:
• The batteries take too long to charge.
• The batteries are not fully charged at the end of the day.
• The charge current from the solar charger is less than expected.
9.3.1. Too much DC load
The solar charger does not only charge the batteries, it also provides power for the system’s loads.
The battery will only be charged when the power available from the PV panels exceeds the power being drawn by the loads in the
system, like lights, fridge, inverter, and so on.
If the system battery monitor is correctly installed and configured you can see how much current is going in (or out) of the battery
and the solar charger will tell you how much current the solar array is generating.
A positive sign alongside the current reading means that current is flowing in to the battery, while a negative sign means that
current is being drawn from the battery.
9.3.2. Battery charge voltages are too low
If the battery voltages have been set too low the batteries will not receive a full charge.
Check if the battery charge voltages (absorption and float) are set correctly. Consult the battery manufacturers information for the
correct charge voltages.
9.3.3. The battery is almost full
The solar charger will reduce its charge current when the battery is almost full.
MPPT solar charger manual
Page 51 Troubleshooting and Support
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