Check ambient temperature and check if the two built-in fans are running. Reduce the ambient temperature.
Settings invalid
Settings data is corrupt. Reset to factory defaults.
8.4. BMS issues
8.4.1. The BMS frequently disables the battery charger
A well-balanced battery does not disable the charger, even when the batteries are fully charged. But when the BMS frequently
disables the charger, this is an indication of cell imbalance.
In case of moderate or large cell imbalance it is an expected behaviour that the BMS frequently disables the battery charger. This
is the mechanism behind this behaviour:
As soon as one cell reaches 3.75V, the BMS disables the charger due to high cell voltage. Whilst the charger is disabled, the
cell balancing process still continues, moving energy from the highest cell into adjacent cells. The highest cell voltage drops and
as soon as it falls below 3.6V, the charger is activated again. This cycling typically takes between one and three minutes. The
voltage of the highest cell will rise again quickly (this can be in a matter of seconds), after which the charger will be disabled
again and so forth. This does not indicate a problem with the battery or the cells and will continue with this behaviour until all cells
are fully charged and balanced. This process might take several hours, depending on the level of imbalance. In case of serious
imbalance this process can take up to 12 hours. Balancing will continue throughout this process and balancing even takes place
when the charger is disabled. The continued enabling and disabling of the charger can appear strange, but rest assured that
there is no problem. The BMS is merely protecting the cells from over voltage.
8.4.2. The BMS is prematurely turning loads off
This could be because of a cell imbalance.
If a cell voltage falls below the "Allowed-to-Discharge cell voltage" setting in the battery (default 2.8V), the BMS will turn the loads
off.
Check the cell voltages of all batteries that are connected to the BMS using the VictronConnect app. Also check if all batteries
have the same "Allowed-to-Discharge cell voltage" settings.
Once the loads have been turned off due to low cell voltage, the cell voltage of all cells needs to be 3.2V or higher before the
BMS will turn the loads back on.
8.4.3. The pre-alarm setting is missing in VictronConnect
Pre-alarm is only available if the battery supports it. The current battery models all support it, but older batteries do not have the
hardware required for the pre-alarm feature.
8.4.4. BMS is displaying alarm while all cell voltages are within range
A possible cause is a loose or damaged BMS cable or connector. Check all BMS cables and their connections.
Also consider that once there has been a cell under voltage alarm, the cell voltage of all cells need to be increased to 3.2V before
the battery clears the under voltage alarm.
A way to rule out if a fault is originating from a faulty BMS or from a faulty battery is to check the BMS using one of the following
BMS test procedures:
Single battery and BMS check:
• Disconnect both BMS cables from the BMS.
• Connect a single BMS extension cable between both BMS cable connectors. The BMS cable should be connected in a loop, as
in below diagram. The loop tricks the BMS in thinking that there is a battery connected without any alarms.
• If the alarm is still active after the loop has been placed, the BMS is faulty.
• If the BMS cleared the alarm after the loop has been placed, the battery is faulty and not the BMS.
Lynx Smart BMS
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Troubleshooting and Support
