The existing photovoltaic installation with a peak capacity of about 70 kW from the company of Technoboxx is to be supported by a so-called redox flow battery. The latter stores the current produced in times with low electricity demand, such as at the weekends, and delivers it in the event of high demand or low electricity production. The company of Technoboxx hence optimises the consumption of site-generated power so that the photovoltaic installation can be operated more economically and less purchase of electricity  from the grid is necessary.
The redox flow battery is a chemical electricity storage unit. Storage is carried out by charged electrolytes which are stored in liquid form in separate tanks. For power consumption and/or output the liquids are pumped through a cell in which a charge exchange takes place through a membrane.
The electrolytes do in fact show a lower energy density and require relatively large tanks, but the battery has a low self-discharge, a high cycle stability and is technically scalable to a very great extent. The efficiency is higher than 80%.