In order to provide the required electric power uninterruptedly to an electrical or electronic consuming device (M) powered by solar cells (1, 2, 3, 4), the supply of power to the consuming device must be assured even under inadequate illumination conditions and/or during brief failures of the solar collector (S), an electronic system is proposed wherein a control circuit (RK) is provided between the solar collector (S) , the consuming device (M), and an electrical energy storage device (C1). The control circuit (RK) functions at least as a connecting and commutating switching device which, subject to the priority of maintaining the operational readiness of the consuming device (M); provides various interconnections of the solar collector (S), the storage device (C1), and the consuming device (M). The control circuit (RK) makes these various connections in dependence on (1) the voltage (U. sub.S) at the solar collector (S), (2) the voltage (U.sub.M) required for operation of the consuming device (M), and (3) the state of charge of the storage device (C1). In this way, it is possible to maintain desired conditions (i.e., operation of the consuming device) during brief failures of the solar collector (S) when the illumination is inadequate. At the same time a situation can be avoided wherein the consuming device (M) can only receive adequate electric power after the capacitor (C1) has been charged to the specified operating voltage (U.sub.M) of the consuming device by the solar collector (S). Thus, the invention makes it possible to avoid the drawbacks of previously known solar power delivery circuits and at the same time enables optimum utilization of the incident light as an energy source for electrical consuming devices.
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