2. Introduction
2.1. General description
The Smart BMS 12-200 is an all-in-one battery management (BMS) system for
Victron Lithium Battery 12,8V Smart
has been specifically designed for 12V systems with a 12V alternator such as in vehicles and boats and supports up to 5 batteries
in parallel (BTVs are simply daisy-chained).
It combines a Current Limiter, Battery Combiner and Battery Protector in a robust and compact solution and lets you safely
connect any size 12V alternator (and starter battery) through its dedicated alternator connection. At the same time, it protects the
alternator (and wiring), provides alternator current limiting and one-way traffic from the alternator into the battery, this so any size
alternator (and starter battery) can be safely connected to the lithium battery and the starter battery is protected from excessive
discharge.
A dedicated power port allows the direct connection of DC loads,chargers or inverters and inverter/chargers to charge
the lithium battery or to supply DC loads with up to 200A. The power port works in both directions and the BMS ensures that it will
cut-off loads in case of imminent cell under voltage to protect the battery and also enables charging through this port.
The Smart BMS 12-200 monitors and protects each individual battery cell within the battery and will disconnect the alternator,
charge sources or DC loads in case of low/high battery cell voltage or high temperature.
The BMS is equipped with Bluetooth for monitoring and configuration via our
, a remote on/off terminal to
shut down the BMS (and the system) via a remote switch and a pre-alarm contact to issue a warning signal before the BMS
disconnects the batteries from the system.
2.2. Features and functionality
Alternator/Starter Batt+ port alternator and battery protection
The input current on the Alternator/Starter Batt+ port is electronically limited to approximately 90% of the fuse rating. A 100A fuse,
for example, will therefore limit the input current to approximately 90A. (For fuse ratings and corresponding current limit please
see the table in the
).
Current can flow to the lithium battery only if the input voltage (corresponds to the voltage of the starter battery) exceeds 13V.
In addition, no current can flow back from the lithium battery to the starter battery, which prevents the lithium battery from being
deeply discharged.
Choosing the right fuse will also:
1. Protect the lithium battery against excessive charge current (important in case of a low capacity battery).
2. Protect the alternator against overload in case of a high capacity lithium battery bank (most 12V alternators will overheat and
fail if running at maximum output during more than 5 minutes).
power port to connect loads and additional chargers
• The port can be used to either charge or discharge the lithium battery (i.e. via an additional charger, an inverter or
inverter/charger connected directly to this port) with a maximum continuous current of 200A in both directions.
• The BMS interrupts the battery charge/discharge if there is a risk of imminent cell under- or overvoltage or low/high
temperature.
Remote on/off terminal
• The remote on/off terminal can be used to interrupt charging via the Alternator port and charging and discharging via the
port, while the BMS functionality will remain active regardless of the remote on/off state.
• Depending on the Remote on/off function setting made via the
, it can also be used as system on/off switch
(Charge and Load disconnect port will also be disabled) either by using a physical switch or a relay contact between L and
H terminal or by using the soft switch in the VictronConnect app. Alternatively, terminal H can be switched to battery plus, or
terminal L can be switched to battery minus.
Note that it is mandatory to install either an on/off switch between L and H of the remote on/off terminal
or the wire loop (default) for correct operation. Alternatively, terminal H can be switched to battery plus or
terminal L to battery minus.
Smart BMS 12-200
Page 2
Introduction
