Sonnenspeicher was designed by Wolfram Walter and German firm ASD . The solar panels are made of a special material called perovskite, which is used in the production of photovoltaic cells for electric cars. Cheapest model is €8,450 ( £6,170 ) , but it will save money on electricity bills . It also comes with 'intelligent management system ' that controls current .
Sonnenspeicher was designed by Wolfram Walter and German firm ASD . Its lithium iron phosphate battery stores energy from solar panels . Cheapest model is €8,450 ( £6,170 ) , but it will save money on electricity bills . It also comes with 'intelligent management system ' that controls current .