Victron energy BMV-700 Manual page 11

2.3 Common problems
No signs of life on the display
Probably the BMV is not properly wired. The UTP cable should be
properly inserted at both ends, the shunt must be connected to the minus
pole of the battery, and the positive supply cable should be connected to
the plus pole of the battery with the fuse inserted.
The temperature sensor (when used) must be connected to the positive
pole of the battery bank (one of the two wires of the sensor doubles as
the power supply wire).
Charge and discharge current are inverted
Charge current should be shown as a positive value.
For example: +1.45 A.
Discharge current should be shown as a negative value.
For example: -1.45 A.
If charge and discharge current are inverted, the power cables on the
shunt must swapped: see the quick installation guide.
The BMV does not synchronize automatically
One possibility is that the battery never reaches the fully charged state.
The other possibility is that the charged voltage setting should be lowered
and/or the tail current setting should be increased.
See section 4.2.1.
The BMV synchronizes too early
In solar systems or other applications with fluctuating charge currents,
the 'charged' voltage should be set only slightly below the absorption
charge voltage (for example: 14,1V in case of 14,4V absorption voltage).
This will prevent the BMV from switching prematurely to 100% state of
charge. See section 4.2.1.
Sync and battery icon are blinking
This means the battery is not synchronized. Charge the batteries and the
BMV should sync automatically. If that doesn't work, review the sync
settings. Or, if you know the battery is fully charged but don't want to wait
until the BMV synchronizes: press and hold the up and down button
simultaneously, until you hear a beep.
See section 4.2.1.
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