Abstract: The present invention relates to an energy harvester system. The energy harvester system includes an energy harvester device, a housing comprising internal walls surrounding at least a portion of the energy harvester device, and a flexible supporting structure supporting the energy harvester device within the housing. Movement of the housing causes the internal walls of the housing, or structures connected to the internal walls, to contact the energy harvester device, whereby the flexible supporting structure and the energy harvester device move such that the energy harvester device contacts the internal walls or structures connected to the internal walls at least one additional time (or multiple times), thereby producing energy. Also disclosed is a system comprising an electrically powered apparatus and the energy harvester system of the present invention electrically coupled to the apparatus.