Hello there. I have the SpF 5000 ES and your advice did not work for me. I was about to create my own cable because I noticed that on Pylontech side the Can/RS485 socket has the Pin 7/8 for communication but the Growatt has the pins 1and2. But my brilliant wife came with the idea of using Can port on batteries and to select L052 instead of Loo2 from menu 36. Result=> IT WORKS!!!