Battery View is a specialized Windows-based monitoring and maintenance tool. Version 3.0.28 was specifically released to support the US-C series
Listing all Pylontech battery modules in Batteryview v3.0.28?
If you are still unable to connect after verifying all the above steps, a final and often overlooked detail may be the cause. One community member reported success after a simple power cycle: "just turn them all off, and rewire the LinkPort0/1 cables in a manner that the last battery will be the master. Power on" [0†L40-L42]. This suggests that the battery addressing within the stack can sometimes be the culprit.
: When using the software, you must identify the correct COM port in the drop-down menu. If the battery is not detected, it is often due to an incorrect cable pinout or the wrong COM port selection.