question

kodax avatar image
kodax asked

Confusing documentation regarding start assist on my Cyrix-Li-ct 230A?

Looking at the Victrons page for my Cyrix-li-ct 230A, I can connet it for start assist:

https://www.victronenergy.no/upload/documents/Datasheet-Cyrix-ct-120A-230A-EN.pdf

1713561830495.png

However, the manual provided with my product, does not state that this is possible
1713561781217.png

Is it still possible, and the manual I got is just describing another use case?

Cyrix Battery Combiner
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1713561830495.png (133.0 KiB)
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1 Answer
Justin Cook avatar image
Justin Cook answered ·

Those are two different products - the upper is from the Cyrix-ct datasheet, the lower is from the Cyrix-li-ct. The Cyrix-ct has start assist, as it's designed to be used between two Pb battery banks; the Cyrix-li-ct does not, as it's designed to be used between a Pb and LFP battery bank.

Here is the proper datasheet for yours: https://www.victronenergy.com/upload/documents/Datasheet-Cyrix-Li-ion-230-A-EN.pdf

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kodax avatar image kodax commented ·

Hi @Justin Cook , and thanks for your swift answer!

You are correct about the upper image is from the ct, not the li-ct, my mistake.

I have the li-ct, and is using it between a Pb and LFP battery bank.
I want to be able to connect the banks if needed.
I do not have a VE Bus BMS.

However, the datasheet you are linking to does also show start assist for the li-ct, but it is not the same picture as the one that followed with my product (the second picture in my original post.
From your link:
1713594323636.png

This shows two yellow cables (and one black), but mine has the "Control cable for Cyrix 12/24-230", and thus one red (and one black).
As my picture show "VE Bus BMS", and yours "V2", maybe I have an older version of the documentation? But your documentation does also show the control cable having black and red cable, so I am still confused. Can I use the red the same way as the one for Start assist in your picture?

And if so, does Victron have a dedicated button to use as a start assist button?

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