Tinbum

That's easy, just put an Arduino, Raspberry Pi or Teensy or similar in the CAN line between the battery and the inverter.

Yes all seems to work ok. The Pylontechs do seem to have a very good reputation and they have been manufacturing for some time so have some history. Their is an Australian web site that has results of long term testing of various batteries and they come out pretty well top.
 
https://batterytestcentre.com.au/reports/

🤣 at your wording.
The problem is those voltages and currents aren't constant. The battery might lower the charge current and raise the voltage at the end of charge in order to do balancing. Or it might lower discharge current due to temperature derating etc.

Why do the manufactures require that an approved inverter is required as part of the warranty? Their would be no need for any CAN connection at all.
The BMS has protection features but that is it protection and control is via CAN.
With Lead acid batteries do you leave them to float at Bulk or Absorption voltages? No you turn the voltage down to float voltages. The BMS is designed to instruct the inverter what to do for the best health of the battery, at the best time and to keep things safe.
For such an expensive piece of kit I would want to keep the warranty. If the manufacturer categorically states that they approve a particular setup then your possibly OK, but I'd not want to risk it myself.

It depends on how valuable to you any warranty is. I'd change inverter. I have done a CAN converter using a teensy for Eltek chargers so it is possible but still not on the approved list!

No, as the BMS ramps the current down as the batteries get fuller and the inverter can't do (know) that based on SOC. Mine will go in steps say from 15A to 7A controlled by the battery BMS sending those values to the inverter..

No, as the BMS ramps the current down as the batteries get fuller and the inverter can't do (know) that based on SOC. Mine will go in steps say from 15A to 7A controlled by the battery BMS sending those values to the inverter..

See 6 on page 3;
https://en.pylontech.com.cn/download.aspx?id=169

Considering it's a new installation your first port of call should rather be the folks that sold it to you I reckon. It's likely under warranty (?) and if by chance you get the wrong info or thing to try on a forum you might void that warrant perhaps?

Agreed, but it's good to have some knowledge of what the problem may be. Don't alter what they have done or supplied and always give them chance to rectify the problem first. But, I've often come across companies that that will try to fob you off even when you have the evidence that what they have done is wrong.