Warning
Lithium batteries are expensive and can be damaged due to over-discharge or overcharge.
The shutdown by the BMS due to low cell voltage should always be used as a last resort to be safe at all times. We recommend not letting it get that far and instead either switching off the system automatically after a defined state of charge via the BMS discharge floor limit so that there is always sufficient reserve capacity in the battery or using the BMS remote on/off port as a system on/off switch.
Damage due to over-discharge can occur if small loads (such as alarm systems, relays, standby currents of certain loads, back current drain of battery chargers, or charge regulators) slowly discharge the battery when the system is not in use.
In case of any doubt about possible residual current draw, isolate the battery by opening the battery switch,pulling the battery fuse(s) or disconnecting the battery plus when the system is not in use.
A residual discharge current is especially dangerous if the system has been discharged completely and a low cell voltage shutdown has occurred. After shutdown due to low cell voltage, a capacity reserve of approximately 1Ah per 100Ah battery capacity is left in the battery. The battery will be damaged if the remaining capacity reserve is drawn from the battery; for example, a residual current of just 10mA can damage a 200Ah battery if the system is left discharged for more than 8 days.
If a low cell voltage disconnect has occurred, immediate action (recharge the battery) is required.
The battery and BMS are monitored and controlled using the VictronConnect app.
VictronConnect has three pages for this purpose: a status page, a battery page and a history page. The individual parameters are explained below.
Status page: The status page provides information about the current battery and BMS status.
|
Battery page: The battery page provides information about the installed battery bank and gives more detailed information about each individual battery. Battery bank info
|
History page: The history page shows information about the battery over time since installation or since the history was last reset.
|
The BMS is equipped with three LEDs: the Bluetooth Status LED, the Error LED, and the VE.Bus Status LED. These indicate the current operating state as well as any faults.
|
The following tables list all LED, warning, alarm and error codes:
Bluetooth Status LED | Description |
---|---|
Off | No system power or Bluetooth is disabled in the VictronConnect app. |
Blue on | A Bluetooth device is connected. |
Blue blinking | Bluetooth is active but no device is connected. |
Error LED | Description |
---|---|
Off | No warning/alarm/error active. |
Red blinking | A warning is active. |
Red on | A alarm and/or error is active. |
VE.Bus Status LED | Description |
---|---|
Off | When the Multi is off, either due to low cell voltage, remote off, or being manually switched off via the front panel switch, the BMS enters low-power mode. In this state, it continues to transmit BMS info frames, albeit at a slightly reduced frequency. To conserve energy, the BMS status LED does not illuminate in low-power mode. |
Single blink every 10 seconds | The Multi is switched on, and BMS info frames are being sent. |
LED will flash rapidly | The BMS is stuck in bootloader mode. This can occur, for example, after an interrupted firmware update. To resolve this, restart the update using VictronConnect. |
Warning codes
VictronConnect warning code | Message | Instructions / Remarks |
---|---|---|
W-B01 | Low cell voltage | Charge the battery or reduce the load to prevent an imminent system shutdown. |
W-B05 | Communication with battery lost | Check the cables between BMS and Battery. |
W-B07 | Low SoC | Charge battery or reduce load to prevent imminent system shutdown. |
Alarm codes
VictronConnect alarm code | Message | Instructions / Remarks |
---|---|---|
A-B01 | Low cell voltage | Charge battery. The system will turn the loads back on when the battery is sufficiently charged. |
A-B05 | Communication with battery lost | Check the cables between BMS and Battery. |
A-B07 | Low SoC | Charge battery. The system will turn the loads back on when the battery is sufficiently charged. |
A-B08 | Low bank voltage | Charge battery. The system will turn the loads back on when the battery is sufficiently charged. |
A-B09 | High battery temperature | The battery temperature is too high for charging. Try to reduce the ambient temperature. |
Error codes
VictronConnect error code | Message | Instructions / Remarks |
---|---|---|
E-B01 | Battery configuration invalid | Check VictronConnect ´Battery´ tab for more details. Check if batteries BMS cables are all connected |
E-B05 | Battery configuration invalid | Check VictronConnect ´Battery´ tab for more details. Check if batteries BMS cables are all connected. |
E-B09 | Battery voltage not allowed | The battery voltage is too high or too low. Check the battery voltage and check the battery settings in the VictronConnect app. This error occurs when the battery voltage is outside all system voltage ranges (9V > Vbat > 60V) |
E-B11 | Hardware error | Contact your Victron dealer. |