Hi Badger, thank you for the advice. I have the new Seplos BMS V3 200ah. I have just charged all the battery cells for the first time and am about to connect them all up to a 4ah Neey active balancer and the Seplos BMS. Do I use the CAN port on the BMS to connect to the computer or do I use RS485 port 1 to connect to the computer. I also have the rj45 to usb connector That came with the BMS, I believe this allows me to use a normal cat5 network cable to connect the BMS to the computer.