Trying and not doing well in finding out what a set of photovoltaic solar slates are, installed. To me the idea of integrating a solar panel into a roof slate is great but no one ever mentions costs on their site. Anyone here have any ideas what pv slates installed are in quids per square metre? I'm dimly aware they make about 100 kWh per year per sqm but I've no idea if this is actually value!