Victron Cyrix battery combiners are a superior alternative to diode isolators. The main advantage that combiners have over isolators is the combiners extremely low voltage loss that makes it unnecessary to increase the output voltages of alternators or battery chargers.
The Victron Cyrix are microprocessor controlled, heavy duty relays that automatically connects batteries to the charging circuit when it reaches a preset voltage (indicating battery is charging), and disconnects when voltage decreases below float level (indicating discharge).
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Cyrix Battery Combiner Features:
12/24 Volt auto ranging (24/48V version also available)
Bidirectional voltage sensing
Replacement for diode isolators
No voltage loss
Connect Voltage 13.8/27.6 VDC
Cyrix Part Number
Isolators / Converters
I have 6 X 220ah house batteries and two 120ah alternators. I also have a Victron Quattro, where and how many of these do I need?
No clue. My setup is not near that complicated.
It depends on how your system is configured. On our boat, each alternator charges a START battery. The Cyrix is downstream from that battery. When it is full, the Cyrix opens and allows the charge to flow to the house bank. Same thing happens when we plug into shore power. So you may need two. If you have twin engines......
Best to call us and ask for Jack, he can help with that.800-497-0010 ext 118
Generally you will use one of these, with the appropriate current rating, to separate battery banks so that the discharge of one bank will not affect the other. The most common case is the house batteries and the starter batteries. The way the device works is that it closes a relay connecting the two banks when the voltage on either side gets up to charging voltage. So if you are charging (from either side) it will connect the banks together and charge both banks. If you are not charging, it separates the two banks.
how do I tell when the battery combiner has engaged and is in fact charging the second battery?
You can't tell until you measure the voltage rise on (or amp flow with a clamp meter into) the second battery. These little combiners work very well. I trust them since I checked their correct operation after installation, and will only check again if I have serious reason to doubt it.
thanks for your reply!
Keeps both batteries charged! Perfect function, but flimsy mounting tab and only one mounting screw.
Biddeford Pool, ME
Form factor could be larger to accommodate off the shelf pre-made battery cables. I believe there may be a kit that includes cables; that would be a plus.
Victron Cyrix Battery Combiner
I have installed two of these on separate boats and this an excellent product at a good price.