victron energy Cyrix-ct 12 24V-230A Intelligent Battery Combiner Owner’s Manual

: June 11, 2024
: victron energy

Table of Contents

victron energy Cyrix-ct 12 24V-230A Intelligent Battery Combiner Owner’s
Cyrix-ct 12/24V-230A intelligent battery combiner
Installation (see figure below)
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victron energy Cyrix-ct 12 24V-230A Intelligent Battery Combiner Owner’s

Manual

Cyrix-ct 12/24V-230A intelligent battery combiner

No voltage loss
The Cyrix-ct 230 battery combiner is a microprocessor controlled heavy duty relay that automatically connects batteries in parallel when one battery has reached a preset voltage (indicating that the battery is being charged), and disconnects when the voltage decreases below float level (indicating that one or both batteries are being discharged).
Cyrix-ct battery combiners are an excellent replacement for diode isolators. The main feature is that there is virtually no voltage loss so that the output voltage of alternators or battery chargers does not need to be increased.

Protection against overheating (due to a long duration overload e.g.)
The Cyrix will disengage in case of excessive contact temperature, and engage again after it has cooled down.

Prioritizing the starter battery
In a typical setup the alternator is directly connected to the starter battery. The accessory battery, and possibly also a bow thruster and other batteries are each connected to the starter battery by Cyrix-ct battery combiners. When a Cyrix-ct senses that the starter battery has reached its connect voltage, it will engage to allow for parallel charging of the other batteries.

Bidirectional voltage sensing
The Cyrix-ct senses the voltage of both connected batteries. It will therefore also engage if for example the accessory battery is being charged by a battery charger.

Intelligent battery monitoring to prevent repeated switching
The software of the Cyrix-ct does more than simply connect and disconnect based on battery voltage and with a fixed time delay. The Cyrix-ct looks at the general trend (voltage increasing or decreasing) and reverses a previous action only if the trend has reversed during a certain period of time. The time delay depends on the voltage deviation from the trend.

12/24 Volt auto ranging
The Cyrix-ct will automatically adjust to a 12V or 24V system.

Installation (see figure below)

The Cyrix-ct can only be used in 12V or 24V installations with a negative common.
Disconnect the minus of both batteries.
Place the Cyrix-ct closest to the smallest battery (in general the starter battery).
Connect the plus of the batteries to the brass bolts of the Cyrix-ct. Install a fuse in series (see fig). The fuse should be sized in accordance with the wire cross section used, but not exceed 230A.
Connect the minus of the Cyrix-ct “battery –“ and reconnect the minus of both batteries.
An emergency start push button can be wired to “start assist” connection if required. The relay will engage during 30 seconds after “start assist” has been momentarily connected to the battery plus. Alternatively, a parallel connect switch can be used to engage the relay as long as the switch remains closed.

| Cyrix-ct 12/24-230
---|---
LED status indication| Yes
Continuous current| 230A
Cranking rating (5 seconds)| 500A
Current consumption when open| <4mA
Current consumption when closed| 12V: 320mA 24V: 180mA
Start Assist| Yes (Cyrix remains engaged during30 seconds)
Protection category| IP54
Weight| 0,27kg (0.6 lbs)
Dimensions (h x w x d)| 65 x 100 x 50 mm(2.6 x 4.0 x 2.0 inch)

Approximate connect and disconnect delay (multiply by two for a 24 V system)

Connect (V)	Delay	Disconnect (V)	Delay
V < 13V	Remains open	V < 11V	0 sec
13,0V < V < 13,2V	10 min	11,0V < V < 12,0V	1 sec
13,2V < V < 13,4V	5 min	12,0V < V < 12,2V	10 sec
13,4V < V < 13,6V	1 min	12,2V < V < 12,4V	30 sec
13,6V < V < 13,8V	4 sec	12,4V < V < 12,8V	3 min
	> 12,8V	remains closed
	> 16V	over voltagedisconnect