System Design And Bms Selection Guide; Maximum Number Of Batteries In Series, Parallel Or Series/Parallel Configuration; The Battery Alarm Signals And Bms Actions - Victron energy 2-67-011400 Manual

3. System design and BMS selection guide

This chapter describes things to consider on how the battery interacts with the BMS and how the BMS interacts with loads and
chargers to keep the battery protected. This information is essential for system design and to be able to choose the most suitable
BMS for the system.
3.1. Maximum number of batteries in series, parallel or series/parallel
configuration
Up to 20 Victron Lithium Smart batteries in total can be used in a system, regardless of the Victron BMS used. This enables 12V,
24V and 48V energy storage systems with up to 102kWh (84kWh for a 12V system), depending on the capacity used and the
number of batteries. See the Installation [12]
Check the table below to see how the maximum storage capacity can be achieved (using 12.8V/330Ah and 25.6V/200Ah
batteries as an example):
System voltage 12.8V/330Ah
12V 20 in parallel
24V 20 in 2S10P
48V 20 in 4S5P

3.2. The battery alarm signals and BMS actions

Cell voltages and battery temperature are monitored by the battery itself. If they are outside the normal range, an alarm is sent to
the BMS.
In order to protect the battery, the BMS will then turn off loads and/or chargers or generate a pre-alarm as soon as it has received
the appropriate signal from the battery.
These are the possible battery warnings and alarms and the corresponding BMS actions:
Battery alarm signal
Low cell voltage pre-alarm warning
Low cell voltage alarm
High cell voltage alarm
Low battery temperature alarm
High battery temperature alarm
The battery communicates these alarms to the BMS via its BMS cables.
If the system contains multiple batteries, all battery BMS cables are connected in series (daisy chained). The first and the last
BMS cable is connected to the BMS.
The BMS receives an alarm signal from a cell in a multiple-battery setup
The battery is equipped with 50 cm long BMS cables. If these cables are too short to reach the BMS, they can be extended with
BMS extension cables.
There are two ways the BMS can control loads and chargers:
Page 4
Lithium Smart Battery Manual
chapter for installation details.
Nominal energy 25.6V/200Ah
84kWh na
84kWh 20 in parallel
84kWh 20 in 2S10P
BMS action
The BMS generates a pre-alarm signal
The BMS turns loads off
The BMS turns chargers off
The BMS turns chargers off
The BMS turns chargers off
The BMS receives an alarm signal from a battery cell
Nominal energy
na
102kWh
102kWh
BMS
BMS
System design and BMS selection
guide