General Description - Victron energy Smart BMS CL 12/100 Manuel

1. General Description

A Smart BMS with Charge Current Limiter that protects the alternator
against overload
The Smart BMS CL is intended for use with Victron Smart LiFePo4 batteries
with M8 circular connectors. It supports up to 5 batteries in parallel (BTVs are
simply daisy-chained).
Starter battery Protection
This function is similar to that of a Cyrix Battery Combiner or Argo FET Battery
Isolator. Current can flow to the LFP battery only if the input voltage (= voltage
on the starter battery) exceeds 13V.
Additionaly, current cannot flow back from the LFP battery to the starter
battery, thus preventing eventual damage to the LFP battery due to excessive
discharge.
Alternator and battery protection
The input current is electronically limited to approximately 80% of the fuse
rating. A 100A fuse, for example, will therefore limit the input current to
approximately 80A. (For fuse ratings and corresponding current limit please
see table 1)
Choosing the right fuse will:
a. Protect the LFP battery against excessive charge current (important in case
of a low capacity LFP battery).
b. Protect the alternator against overload in case of a high capacity LFP
battery bank (most 12V alternators will overheat and fail if running at
maximum output during more than 5 minutes).
Li-ion battery protection
Excessive input voltage and transients are regulated down to a safe level.
The BMS will stop charging in case of cell over voltage or over temperature.
It has three outputs, similar to the miniBMS:
Load Disconnect output
The Load output is normally high and becomes free floating in case of
imminent cell under voltage (default 2,8V/cell, adjustable on the battery
between 2,6V and 2,8V per cell). Maximum current: 10mA. The Load output
can be used to control the remote on/off input of a Battery Protect, inverter,
DC-DC converter or other loads.
Pre-Alarm output
The pre-alarm output can be used as warning when the battery voltage is low
and it will trip shortly before the Load Disconnect output is disabled due to cell
under voltage.
The pre-alarm output may be used to drive a relay, LED or Buzzer. It can be
configured as continuous or intermittent signal.
The pre-alarm output is normally free floating and becomes high in case of
imminent cell under voltage (default 3,1V/cell, adjustable on the battery
between 2,85V and 3,15V per cell). Maximum current: 1A (not short circuit
protected)
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