Thanks. I misremembered that one. So it reduces the energy cost by a factor of three. Still needs a heap of solar panels to get about 200 kWh per day. I hav

Thanks. I misremembered that one. So it reduces the energy cost by a factor of three. Still needs a heap of solar panels to get about 200 kWh per day. I have a friend in southern France who has eight panels and it has taken him fifteen weeks this summer (105 days) to get 1000 kWh this summer, say 10 kWh per day so you need 160 panels. to get 200 kWh per day. My purpose was to point out that the size of the installation is likely to be quite a bit bigger than a cursory glance at the article would suggest.