On the north facing roof? It's also not the same shape as the front. The neighbour across the road has the same house as us, you can see what the rear roof looks like.
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Yes, facing used to be important when the system (panels/inverter) were more expensive than the one off soft costs like labour and scaffold, and the panels were much lower producing. It is now commonly seen as sensible to fit as much as you can, as you will achieve more kW in the duller months, and if you care about payback, it will payback faster as you export way more in the sunny months.
