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A kit for adding a 2nd or 3rd battery system in your car, boat, RV or whatever you wish. It Utilizes the Simplest and most advanced technology to keep all your batteries charged using the engines electrical system but isolates the starting battery when charging ceases so you never get stranded.

The Cyrix-i battery combiner is a microprocessor controlled heavy duty relay that automatically connects batteries in parallel when one of them 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 more batteries are being discharged). Cyrix-i 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.

Cables And Lugs Included:

• 6 meter RED 10mm2 Cable; 0.5mtr BLACK 10mm2 Cable; 0.2mtr BLACK 1.5mm2 Cable assembly with M8 Lug and 6.3mm fast on the terminal

• 2pcs M8 Cable lug with insulation sleeve; 4pcs M6 Cable Lug with insulation sleeve; 4pcs cable tie 150mm

Intelligent Battery Monitoring To Prevent Unwanted Switching

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-i 12/24 does more than simply connect and disconnect based on battery voltage and with a fixed time delay. The Cyrix-i 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 200A-400A)

12/24V Auto Ranging

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

No Voltage Loss

Cyrix battery combiners are an excellent replacement for diode isolators. The main feature is virtually no voltage loss so that 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-i 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-i 12/24 will not close if the voltage on one of the two battery connections is lower than 2V (12V Battery) or 4V (24V 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 helpful in case of emergency when the starter battery is discharged or damaged.


• Continuous Current 120A; Maximum alternator rating 150A; Auto-Ranging 12/24Volt

• Connect voltage (delay appr. 10 minutes) 13V/26V

• Connect Voltage (delay appr. 4 seconds) 13.8V/27.6V

• Disconnect Voltage (delay appr. 10 minutes) 12.8V/25.6V

• Disconnect voltage (delay appr. 4 seconds) 11.8V/23.6V

• Over Voltage Disconnect 16V/32V

• Current consumption when open

• Emergency Start: Yes, 30 Seconds

• Protection Category: IP54