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TLDR (although it's quite short), he got 21W.

The largest factor is the day-cycle. He gets 3 hours equivalent of Sun light a day. I really expected Australia to be more sunny than that.

Planting trees around your house creates a lot of passive cooling, which can save you a lot of power on making the interior comfortable.

It also makes roof top solar a bit of a joke.

Mostly clouds and rain bring this down to 600Wh/day. Washed the bird poo off the panel to get an extra 2 watts.