question

Straight cables almost never work, but you can use a regular shunt or lynx shunt, how is your lynx shunt connected to cerbo?

You need to run them as "dumb" batteries via a shunt. Not ideal but it works, just requires some careful configuration.

It is the battery manufacturers responsibility (for unsupported batteries) to provide support for any connectivity or subsequent issues.

A common mistake is for people unfamiliar with the environment, to assume that anything with a CAN port can communicate with each other. They fail to understand that CAN is the underlying transport, what matters is the messaging sent over the link, which is proprietary.

Image CaptionAm I in luck? I have made a type A bms can cable and connected my Rahvolt batteries, and I'm getting a result as in the attached picture, but for some reason it states Pylontech as yhe battery brand. Is this the actual brand of my Rahvolt batteries?

Also now that I have a soc % readout, where does this leave my lynx shunt, is this now redundant?

Many battery manufacturers clone Pylontech comms because so many inverters have Pylontech protocols incorporated as standard, this makes it easy for them to be used.

You may or may not need your shunt, if these were Pylontech batteries with well proven SOC reporting you could do without the Lynx shunt. However, not all batteries have good SOC reporting, especially during the first cycles until the BMS learns the batteries and they get balanced. Keep it for a while, see how the battery SOC stacks up against the Lynx then make your decision.