The effeciency of home solar panels in Cumbria is effected by a number of factors. The most significant being Cumbria's geographical location, local weather patterns, and the attributes of the individual property which will include roof orientaion and pitch.
Solar panels in the North of England will, on average, achieve approximately 86.2% of the efficency of those in the very South West of England. Although the weather patterns on the West side of England are not as favourable as those in the East, households in Cumbria should still enjoy a financial return exceeding £36k over a 25 year period.
Also note that Cumbria's solar panel installations cash returns should still equal or exceed the figures estimated in our feed in tariff calculator, since that calculation uses an average which includes Southern Scotland.