The demand of power is growing continuously. To handle this increase the energy supply industry has to build up their capacities. This development will be very costly, leading to a rise in cost for a kilowatt-hour for the public. This master thesis should offer the first step to the public for a self – supply with electrical. In a first step, it is key to become aware of the main factors that may influence a photovoltaic system. The main influencing factors are weather, behaviour of electrical equipment, lead acid batteries as energy storing elements and also the legal environment. These factors are characterizing how a photovoltaic system with local energy storage has to work. In a next step a laboratory plant to save the produced power is being created. This is realized with a power supply unit instead of a photovoltaic system, a power measurement, an uninterruptable power supply with a load and five lead acid batteries including controllable chargers. After testing the capacity of these batteries and their charge and discharge behaviours, the system has been realized in laboratory scale (1:10). In fact this system is able to save the produced power, to use it on demand and to use the power even if the power supply is disconnected. Another part of the master thesis discusses economics. It should be shown if it is profitable to invest money in the storage of energy. Nowadays, the cost of energy is too low for that but in the future it will be very advisable to give people the opportunity to produce electric energy for themselves.