System allows complete or partial independence of energy distribution network and is a combination of OFF-GRID island system with a traditional photovoltaic power station ON-GRID, while using advantages of both. The main advantage of CES BATTERY BOX system is that it can work using distribution network and also in case of a fall-out. The main aim is energy independence of distribution network and maximum use of produced electric energy with own implemented optimisation. Possible to work with excess of produced el. energy.