Abstract:
A ground vehicle for feeding photovoltaic modules to an automatic assembly machine is disclosed, wherein the automatic assembly machine is movable on previously installed PV modules and the PV modules that still need to be installed are fed to the automatic assembly machine above a supporting structure. The ground vehicle has six vertically movable rams arranged in spaced-apart relationship in pairs in the direction of travel, with the PV modules to be installed located above the rams. Timing of the vertical ram motion is controlled so that a retracted ram of a ram pair is always extended before the other ram of the ram pair is lowered.
Abstract:
A method for operating a photovoltaic system with a plurality of photovoltaic modules and with a DC motor connected to the photovoltaic modules is proposed. The motor shaft of the DC motor is coupled to a generator shaft of a three-phase generator, wherein the three-phase generator can be connected to a power grid. The motor shaft of a second DC motor can also be connected with the generator shaft, and the electric energy produced by the photovoltaic modules is initially only used for driving a single DC motor and is during the subsequent operation divided between those DC motors. A battery is provided which can be connected with the second DC motor instead of the PV system by changing the excitation of the second DC motor such that it's motor voltage corresponds to the open-circuit voltage of the battery.
Abstract:
A mounting support for mounting photovoltaic modules constructed with at least one glass pane on a flat roof surface includes a flexible elongated strip having a bottom side with a substantially smooth surface for attachment to the roof surface and a top side with a substantially smooth surface for supporting the photovoltaic modules. The top side of the strip includes recesses oriented perpendicular to the longitudinal direction of the strip and separating strip segments which allows the mounting support or strip to be easily rolled up. The strip segments include integrally formed fastening members configured to engage with cooperating fasteners for securing the photovoltaic modules on top side of the strip. The top surface may also include longitudinal grooves or tubes holding the fastening members.
Abstract:
A photovoltaic system includes a plurality of photovoltaic modules and a DC motor connected to a three-phase generator driven by a shaft. The three-phase generator is connected to a power mains. The electric power supplied to the DC motor by the plurality of photovoltaic modules is repeatedly measured and adjusted, by changing an external excitation current of the DC motor, to the peak power attainable at the current ambient temperature and the current incident solar radiation intensity. The peak power is preferably determined by incrementally changing the excitation current in predetermined time intervals, until the supplied electric power produces a power level which can be regarded as the peak power.