Right. Sydney is at 33.9 S and Darwin is 12.4 S

Quote from the article:

In Sydney, south-facing panels typically produce around 30% less energy than north-facing ones. The steeper the roof, the less they’ll produce. They’ll also produce much more energy in summer than winter.

In the far north, the difference isn’t as great and in Townsville south-facing solar panels will only produce around 15% less energy overall than north-facing ones. Because Queenslanders generally use more electricity in summer than winter due to air conditioner demand, the fact that south-facing panels have considerably higher output in summer can improve self-consumption.

In Darwin, south-facing panels produce about 17% less electricity overall than north-facing ones, and, like in Townsville, they have considerably higher output in summer than winter.