Victron Cyrix-ct 12/24V-120A Battery Combiner
Victron Cyrix-ct 12/24V-120A Battery Combiner
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Victron Cyrix-ct 12/24V-120A Battery Combiner


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Subtotal: $62.00


  • Intelligent Battery Monitoring
  • Prevents Unwanted Switching
  • Bi-Directional Voltage Sensing
  • Emergency Parallel Connection
  • Auto Ranging

Some battery combiners (also called voltage controlled relay, or split charge relay) will disconnect a battery in case of a short but high amperage load. A battery combiner also may fail to connect a large but discharged battery bank because the DC voltage immediately drops below the disengage value once the batteries are connected. The software of the Cyrix-ct 12/24 does more than simply connect and disconnect based on battery voltage and with a fixed time delay. The Cyrix-ct 12/24 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. (For battery Combiners with multiple engage/disengage profiles, please see the Cyrix-i 400)

More Product Features:

Long Bolts - To allow connection of more than one power cable:

Cyrix 12/24-120: 13 mm (M6)

Protection Against Overheating:

The Cyrix will disengage in case of excessive contact temperature, and reengage again after it has cooled down.

12/24 V Auto Ranging:

The Cyrix-ct 12/24 automatically detects system voltage.

No Voltage Loss:

Cyrix battery combiners are an excellent replacement for diode isolators. The main feature is that there is virtually no voltage loss so the output voltage of alternators or battery chargers does not need to be increased.

Prioritising 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 with Cyrix battery combiners. When a Cyrix senses that the starter battery has reached the connect voltage it will engage, to allow for parallel charging of the other batteries.

Bidirectional Voltage Sensing and Power Supply from Both Batteries:

The Cyrix 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. The Cyrix-ct 12/24 has a dual power supply. It will therefore also close if the voltage on one battery is too low to operate the Cyrix. In order to prevent unexpected operation during installation or when one battery has been disconnected, the Cyrix-ct 12/24 will not close if the voltage on one of the two battery connections is lower than 2 V (12 V battery) or 4 V (24 V battery).

Parallel Connection in Case of Emergency (Start Assist):

The Cyrix can also be engaged with a push button (Cyrix remains engaged for 30 seconds) or a switch to connect batteries in parallel manually. This is especially useful in case of emergency when the starter battery is discharged or damaged.

More about Victron:

Victron Energy has a strong, unrivalled reputation for technical innovation, reliability, and build quality. Their products are widely considered to be a professional choice for independent electric power. Efficiently combining two or more distinct power sources is what they do best. Their products include sinewave inverters, sinewave inverters/chargers, battery chargers, DC/DC converters, transfer switches, battery monitors and more.

LED status indication


Continuous current

120 A

Cranking rating (5 seconds)

180 A

Connect voltage

From 13 V to 13.8 V and 26 to 27.6 V with intelligent trend detection

Disconnect voltage

From 11 V to 12.8 V and 22 to 25.7 V with intelligent trend detection

Current consumption when open
<4 mA
Current consumption when closed
12 V : 220 mA,   24 V : 120 mA
Start Assist
Yes (Cyrix remains engaged for 30 seconds)
Control cable included (length 1 m)
Protection category
46 x 46 x 80mm


Please see more details in the 'Data Sheets' tab.


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