Please explain its fan working macanism. 1st case - I noticed when in charging mode, mains available but no load on inverter then it fan is running also. 2nd case - Suppose load runs on battery and for little load its fan remains idle but when mains available then it starts running. 3rd case- if mains available, battery is charging then if i turned it off then its fan is running aslo. what is happening for your case please reply.