Do I need a South Facing Roof?
Solar generation does not rely on south-facing panels.
Whilst south is always the best orientation to maximise peak output, west and east are equally effective either on their own or together. In fact, an east-west configuration is beneficial since the peak is spread across the day. All east, south, west positions at the same time are best as then you are spreading the generation across the day plus maximising your peak at midday which might be beneficial for battery charging.