The inability of the WiFi dongle to connect to a 5GHz network may stem from several underlying electrical and network logic issues. The inverter relies on proper communication protocols to transmit performance data to the monitoring app. If the dongle cannot establish a connection, it may be due to a mismatch in network frequency, which can trigger a fault in communication. Additionally, the inverter's firmware must be compatible with the dongle; otherwise, it may not recognize the connection attempt. Insufficient power supply to the dongle can also lead to failure in establishing a network connection, as it requires adequate voltage to function correctly.