Plugs in and the current flows: Solar power systems for balconies, the garden hut, the carport and house and garage walls can be operated as easy. Such compact photovoltaic systems with plugs for ordinary sockets are not only for homeowners, the first step towards their own electricity production, but also for tenants. "The attraction of these devices is that they are easily set up and operated by lay people," says Martin Brandis, energy consultant of the Federal Consumer Center. As a rule, the manufacturers delivered are sufficient for this, the support from a specialist company is usually not necessary. How do the systems work? The essential element of these solar systems from the shelf are one or two panels that together generate a power of the highest 600 watts. The solar radiation generates direct current, which is then converted into a network current in the device. And it merges into the domestic power grid via an ordinary Schuko connector. For safety, you shou...