Battery Voltage Setting Too Low; Controlled By An External Device; Battery Supply Issue - Victron energy BlueSolar MPPT 75/10 Manual

• Shading – see this shading blog story
• 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".

9.2.6. Battery voltage setting too low

The battery will not be charged if the "battery voltage" setting in the VictronConnect App is set at a voltage lower than the actual
system voltage.
Check that the battery voltage is set properly in the settings of the solar charger. The battery voltage setting has to match that of
the voltage of the battery.
To access the "battery voltage" setting, navigate to the controller settings in VictronConnect and then click on the "Battery"
settings menu.
The "battery voltage" setting is listed at the top of the battery settings menu. Depending on controller model 12, 24, 36 or 48V can
be selected.
In case the VictronConnect App is not available and a display is used, refer to the display manual on how to check or change this
setting.

9.2.7. Controlled by an external device

The solar charger can be controlled by an external device. The external device can stop or reduce the charge current to the
battery.
There are different types of external control:
• Managed batteries or an inverter/charger in an ESS system can control the solar charger via a GX device. The battery dictates
if charging is allowed, and when charging is allowed, what charge voltage and currents are used. If external control is active
this will be displayed in the VictronConnect App and also on the GX device.
• The BMS of a managed battery can directly turn the charger on or off via a VE.Direct non-inverting remote on/off cable. This
cable is connected to the VE.Direct port. The BMS can turn the charger of via this cable. If the charge settings are correctly set
and if all battery cells are balanced, the BMS should never disallow charging. The BMS will disallow charging when the cell
voltage of one (or more) battery cells is too high or when the low temperature cut off is enabled and the battery temperature has
dropped below the temperature threshold.

9.2.8. Battery supply issue

For the solar charger to be fully operational as a battery charger, it needs to be connected to a battery.
Although it might look like the solar charger is connected to the battery, it is very well possible that the controller is not receiving
the battery supply, there is no voltage at the battery terminals of the solar charger.
Page 41
MPPT solar charger manual
for more information.
VictronConnect battery voltage setting
Troubleshooting and Support