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Technically, it should be "200 watts". The losses happen due to all the inversion and conversion (I think... right?)

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.