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• Splitters or combiners issues, or these are used in an incorrect way.
PV array design issues:
• Solar array wiring configuration mistake - not enough panels in a series string.
Reverse PV polarity:
• The positive and negative have been swapped when connected to the controller, read next paragraph: "Reverse PV polarity".
5.3.4. Reverse PV polarity
As long as the unit is installed within the published specifications, the PV input is protected internally against PV reverse polarity.
In case of reverse PV voltage, the solar charger will not indicate an error. The only way to tell is by the following signs:
• The controller is not charging the batteries.
• The controller is getting hot.
• The PV voltage is very low or zero Volt.
If this is the case check for reverse polarity using a multimeter by ensuring that the positive PV cable is connected to the positive
PV terminal, and the negative cable is connected to the negative terminal.
5.3.5. PV voltage too high
The PV voltage should never exceed the maximum rated PV voltage of the solar charger. The maximum PV voltage rating is
printed on the front or on the side of the housing of the controller, and in the product specification sheets.
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
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.
5.3.6. Battery full
Once the battery is full the solar charger will stop charging or will greatly reduce the charge current.
This is especially the case when at the same time the DC loads in the system are not consuming any power from the battery.
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Isolated SmartSolar MPPT RS
solar charger product
page. In case the PV array is located in cold climates or if
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Troubleshooting Guide - MPPT
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