120A 24V-48V Cyrix-Li Battery Combiner - Victron Energy

Description

LiFePO4 battery: it prevents undervoltage, overvoltage and overheating of the cells.
The first line of defense is cell balancing. All Victron LiFePO4 batteries incorporate cell balancing.
The second line of defense consists of:

• shutting down the load in case of imminent undervoltage on the cells, and
• shutting down and reducing the charge current in case of imminent overvoltage on the cells, high (>50°C) or low (<0°C) temperature.

The VE.Bus BMS is the heart of the second line of defense.
However, not all loads or chargers can be controlled directly by the VE.Bus BMS
To shut down these loads or chargers, several VE.bus BMS controllable switches are available Cyrix-Li-load

Cyrix-Li-Charge

The Cyrix-Li-Charge will connect a battery charger with a 3-second delay:

• if the load disconnect output of the VE.Bus BMS is high, and
• if it measures 13.7V (27.4V or 54.8V resp.) or more on its battery charger connection terminal, and
• if it measures 2V or more on its battery terminals (the Cyrix will remain open if not connected to the battery).

The Cyrix-Li-Charge will immediately shut down if its control input becomes floating, indicating overvoltage or overheating of the cells.
In general, a cell overvoltage alarm will reset shortly after the charging process is stopped. The Cyrix
will then reconnect the charger after a 3-second delay. After 2 attempts to reactivate with a 3-second delay, the delay will increase to 10 minutes.
If the battery voltage is below 13.5V (27V or 54V resp.), the Cyrix will shut down with a one-hour delay.
Note 1: In case of zero discharge current, or reduced discharge current, the Cyrix will not shut down immediately after stopping
and/or disconnecting the charger as the battery voltage will remain above 13.5V.
Note 2: If, after the Cyrix has shut down, the battery charger output immediately rises to 13.7V or more, the Cyrix will reactivate with a three-second delay.

A built-in transient voltage suppressor will limit voltage spikes that may occur when the Cyrix suddenly shuts down due to overvoltage or overheating of the cells.