DThe offer sounds unbelievable at first glance: For around € 90 rent per month, customers of the Sonnen company get a photovoltaic system and a power storage. For 250 euros more, there is already an e-car. Instead of a leasing contract, the rent will initially run for six months to test the entry into electromobility. If you do not like the car, you can exchange it for another new car after this period and also opt for subscriptions with longer terms. WELT explains how the offer pays off and whether it really pays off for consumers.