When setting up a Fox ESS system with the EP5 battery, it’s essential to use the Parallel RJ45 Ports, as the system won't function properly without them. Unfortunately, these ports are not always pre-installed, which adds extra steps to the installation process. Additionally, ensuring the CT clamps are installed correctly is critical. The arrows on the clamps should point towards the grid, unless your wiring is reversed. Signs of incorrect CT clamp direction include minus load figures, high grid export, and misallocation of energy. Proper setup ensures optimal performance of your solar energy system.