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I have been watching to see what paths are typically viable with 5 watts on 30 meters. I decided to leave the radio on over night and let my computer do some work. In the last 6 hours my station heard France, Brazil, Australia, and Japan. All of those stations we running 5 watts or less of power.
The path to Australia is open every day. Initially I thought that I might added by gray-line propagation (normally the radio had been turned on around the same time as sunrise) but clearly that is not the case right now because this screen capture is at 5:45am central time which is quite a bit prior to sunrise.
Clearly WSPR and 5 watts is enough RF & power resolving power to make it across the pond every day.
73 de NG0R