not alot of info but do you have something on a timer that is coming on at that time what are you calling a main safety?
Does your hot water tank start heating at that time? Safety switches will trip, when loads are switched on, if either the active or neutral connections are interconnected with unprotected circuits.
Is your main breaker in a metal box on the outside of your house? On the west side? You come home and start using appliances, meanwhile the sun starts heating up that main breaker, and then it trips!
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