With the price for solar-panels falling exponentially (1/2 every ~6 years), north facing tiles even in the most extreme examples will become profitable in a few

With the price for solar-panels falling exponentially (1/2 every ~6 years), north facing tiles even in the most extreme examples will become profitable in a few decades or less. [0] http://blog.comparemysolar.co.uk/wp-content/uploads/2013/03/10-year-solar-panel-price-forecast-2013-2022.png http://blog.comparemysolar.co.uk/wp-content/uploads/2013/03/... etc