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Bifacial solar panels generate power from both the front and back of the panel. In Perth conditions the rear-side gain is real but modest. Here's when bifacial is worth considering and when standard monofacial panels are the better buy.
Bifacial solar panels generate electricity from both sides, capturing direct sunlight on the front and reflected light on the rear. On a standard Perth tile roof the rear-side gain is small. On a ground-mount, carport, or pergola over a light surface, it can be worth the extra cost.