Victron Cyrix-i 24/48V-400A intelligent battery combiner

The Victron Cyrix-i 24/48-400A (MPN CYR020400000) is a pioneering battery coupler that prevents unwanted switching during charge current distribution. Some battery control relays trigger disconnections when high currents occur for a short time. It can also happen that a large but empty battery bank cannot be connected because the voltage drop when switching on causes the voltage to fall below the threshold value for switching off.
The software stored in the Cyrix-i does not only refer to voltage values and fixed time intervals. Rather, Cyrix-i takes the trend (voltage/time – curves) into account and only intervenes if the trend changes over a certain time interval. The time delay is proportional to the voltage deviation of the trend curve. In addition, four different switching/time curves can be set.

Important product features of the Cyrix-i 24/48V-400A

• Continuous current: 400A
• Max. peak current (1 second): 1000A
• Operating voltage range: 24V / 48V (auto-detection)
• MPN: CYR020400000

Automatic range selection at 12/24V and 24/48V
The Cyrix-i automatically detects the applied system voltage.

No voltage loss
The Cyrix-i battery control is the alternative to isolating diodes. Since there is practically no voltage loss, there is no need to increase the charging voltage at the alternator or charger to compensate for losses, as is otherwise customary.

Priority circuit for the starter battery

Typically, the alternator is connected directly to the starter battery. The on-board power supply battery, possibly the bow thruster battery, and others are connected via Cyrix-i devices. Only when the starter battery has reached the appropriate voltage does Cyrix-i switch the other batteries to parallel charging.

Bidirectional voltage measurement and power supply

The Cyrix-i measures the voltage values of the connected battery groups. It therefore typically also reacts when the on-board battery is being charged by a charger.
The Cyrix-i has a dual power supply. It therefore also works when one of the connected batteries has insufficient voltage for Cyrix-i operation.

To prevent unwanted switching during installation or after disconnecting the battery connection, Cyrix-I will not switch if the voltage value of one of the two battery connections falls below 2V (12V battery), 4V (24V battery), or 8V (48V battery).

Parallel connection in an emergency

The Cyrix-i can also be switched on via a pressure switch (Cyrix-i then remains switched on for 30 seconds). There is also a switch for manually connecting the batteries in parallel. This is particularly helpful if the starter battery is empty or damaged in an emergency.

Scope of delivery
1x Victron CYR020400000 Cyrix-i 24/48V-400A battery coupler
1x operating instructions