KUBIK 500 and KUBIK 1200 are a DC-AC power inverters with a pure sine wave output designed for stand-alone applications, that is for systems supplied by batteries where the traditional 230VAC power grid is not available. KUBIK 500 and KUBIK 1200 are inverters which convert a 12 or 24VDC input voltage supplied by the batteries, into a 230VAC at 50 or 60Hz output (with regulating possibility). A main innovative feature of KUBIK 500 and KUBIK 1200 are that they allow the user to connect together modular power systems. That is, when in one system the total power requirements of the loads increase during the time up to higher amounts than the maximum permitted values by one inverter, there is the possibility to connect in parallel more KUBIK.