Skip to main content

MPPT solar charger manual

9. Troubleshooting and Support

In this section:

Consult this chapter in case of unexpected behaviour or if you suspect a product fault.

The correct troubleshooting and support process is to first consult the common issues as described in this chapter.

Should this fail to resolve the issue, contact the point of purchase for technical support. If the point of purchase is unknown, refer to the Victron Energy Support webpage.

9.7. Settings or firmware issues

9.7.1. Incorrect settings

Incorrect settings can cause strange solar charger behaviour. Check if all settings are correct.

If in doubt, it could be an option to reset all settings to default using the VictronConnect app and then make all required settings. Consider saving the existing settings before performing a reset.

In most cases the default setting can be used with only minor changes.

If help is required with making settings, please refer to the manual or contact your Victron supplier or distributor.

9.7.2. Unable to select 36V or 48V battery voltage

Not all solar chargers support 36V or 48V battery system voltages.

The drop-down menu in the VictronConnect App will display the supported battery voltages.

9.7.3. Firmware issues

To rule out a firmware bug, update the firmware.

NOTE: It might be useful to write down the firmware number before and after the update. This can be usefull information should you need to request support.

On first connection, the controller might have updated the firmware. If the controller did not automatically ask for a firmware update, check if the controller is running the most up to date firmware and perform a manual update:

  • Connect to the controller.

  • Click on the settings symbol setting-cog.png .

  • Click the option symbol option-symbol.png.

  • Go to product info.

  • Check if you are running the latest firmware and look for the text: “This is the latest version”.

  • If the controller does not have the most up to date firmware, perform a firmware update by pressing the update button.


Status screen - Settings screen - Product info screen

9.7.4. Interrupted firmware update

This is recoverable and is nothing to worry about. Just try to update the firmware again.

9.8. Load output issues

9.8.1. Load output not working

There are a number of reasons why the load output might not be working as expected:

  • The battery voltage has dropped below the set threshold and the load output has disconnected from the battery in order to protect the battery. Check the battery voltage and check the load output setting as programmed via the jumper or via VictronConnect or display.

  • BatteryLife is active. For more information on BatteryLife see chapter BatteryLife.

  • The load output has been set to switch on at night and off during the day, for example the controller is used for streetlight control.

  • The load output is turned off in the VictronConnect settings.


Be aware that it can take 2 minutes before the load output becomes active after changing settings.

9.8.2. Load output not able to run load

These are possible reasons why the load output might not be able to run a load:

  • The connected load is exceeding the load output rating.

  • If a 100/20 solar charger is set to 36V or 48V the load output is reduced from 20A to 1A.

  • Some loads with high inrush current can best be connected directly to the battery and let the load output control the inverter via a remote on/off cable. See the manual for more information.

  • The load output is short circuited, either because of a wiring issue or a malfunctioning load is connected to the load output.

9.8.3. Incorrect load output current reading

For an accurate load output reading, all loads need to be connected to the positive load terminal and to the negative load terminal of the solar charger.

Loads that are connected directly to the battery will not be included in the current reading. So also for loads where the positive cable is connected to the load output, but the negative cable is connected directly to the battery.

Some loads (especially inverters) are best connected directly to the battery. But this will cause the load current reading to do so incomplete as it does not include the current traveling directly into load that is connected directly to the battery. Consider adding a BMV battery monitor which will measure all current going in or out of the battery, including the current going to the loads that have been connected directly to the battery.


Full load current reading

Incorrect load current reading

No load current reading