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7.3. BMS operating modes
The BMS in the Lynx Smart BMS communicates with the batteries and will safeguard them against low or high cell voltage as
well as low or high temperatures. Such events are reported by the battery to the Lynx Smart BMS to take necessary action by
turning off loads and/or inverter/chargers and chargers and either turning the Lynx Smart BMS off or on again, fully automatically
or manually.
The Lynx Smart BMS has 3 modes of operation:
ON
This is the normal operating mode. All interfaces are operational, and the contactor is closed. If the Lynx Smart BMS was off due
to low cell voltage, it will exit OFF mode and return to ON mode when
• it detects a charge voltage 0.5V higher than the battery voltage on the system side or
• when all cell voltages are higher than 3.2 V or
• when it is turned back on via the Remote on/off switch or
• when it is turned back on via the VictronConnect app.
The mode is also ON for a duration of 2 hours with no charge voltage supplied when a Low Cell Voltage alarm was issued.
OFF
Lowest power mode. All interfaces are off, and the contactor is opened. This mode is used to prevent damaging batteries by
draining them too low.
OFF is the mode the LSB will enter when using the Remote on/off switch or the soft switch in the VictronConnect App.
In addition, the Lynx Smart BMS goes into OFF mode (to prevent further discharge)) with a 2 hour delay if one or more cells fall
below 2.8V (adjustable in battery) and no charging voltage was detected during that time.
Standby
The Lynx Smart BMS can be put into Standby mode via the soft switch in the VictronConnect app or via the GX device and is
used when the boat is docked or the RV is parked to prevent accidental discharging and charging from sources on the system
side. All systems will be shut down, except for equipment powered by the AUX power port from which we recommend for
powering the GX device. This mode is not intended to be used when the boat or RV is in storage for a longer period. Therefore,
when a low cell voltage is detected, the Lynx Smart BMS will automatically switch to OFF mode to prevent further battery
discharge.
The basic requirement for the soft switch to work in VictronConnect or in the GX device is that the contact
between pins 10 and 11 of the multi connector is bridged with either a wire loop or a remote on/off switch.
See below tables for an overview of all 3 operating modes, how to switch them manually and the status of the interfaces:
Mode
Main
contactor
On
Closed
Standby
Open
Off
Open
Lynx Smart BMS device modes and status of the interfaces
Mode
Soft switch VictronConnect app
ON
Yes
Standby
Yes
* Only possible from Standby mode
Page 20
Lynx Smart BMS
ATC
ATD
AUX
power
output
On
On
Powered
Off
Off
Powered
Off
Off
Off
Soft switch GX device
Yes*
VE.Can
Bluetooth
port
Functional
On
Functional
On
Off
On
Hard wired Remote on/off switch
Yes
Commissioning and Operation of the
Intended use
Normal operating mode. All
interfaces are operational.
All systems will be shut
down, except for equipment
powered by the AUX
power port from which we
recommend for powering
the GX device.
Lowest power mode. All
interfaces are off, and the
contactor is opened.
Yes
No
Lynx Smart BMS
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