Abstract: An audio output system for a vehicle. The audio output system includes a volume setting device for setting a volume of an audio signal, an audio input for an audio input signal from an audio source, a warning tone device for providing a warning tone signal, an audio-level measuring device for measuring the audio level at the audio input, and a control unit. The audio-level measuring device is configured to limit the maximum audio level of the audio input signal to a predefined first threshold value as a function of the set volume. The control unit is configured to control an audio output signal on the basis of the warning tone signal, the audio input signal and the set volume, and to output an audible or visual notification if the audio input signal present at the audio input has no audio level.

Abstract: A processing unit for an audio system of a vehicle comprises a first processing node, a second processing node and a program memory. The program memory may be overwritten by the first processing node and by the second processing node. After the processing unit has started up the first processing node may compute and write to the program memory an audio output. The processing unit may also perform a handover of the computing of the audio output from the first processing node to the second processing node when the first processing node has overwritten the program memory up to a predefined point and when the second processing node is operational. The second processing node is designed to compute the audio output after the handover, and to write this audio output to the program memory.

Abstract: An audio output system for a vehicle. The audio output system includes a volume setting device for setting a volume of an audio signal, an audio input for an audio input signal from an audio source, a warning tone device for providing a warning tone signal, an audio-level measuring device for measuring the audio level at the audio input, and a control unit. The audio-level measuring device is configured to limit the maximum audio level of the audio input signal to a predefined first threshold value as a function of the set volume. The control unit is configured to control an audio output signal on the basis of the warning tone signal, the audio input signal and the set volume, and to output an audible or visual notification if the audio input signal present at the audio input has no audio level.

Abstract: A method of locating a maintenance vehicle in a solar power field can include driving the maintenance vehicle on a track. A plurality of flags are coupled to the track at spaced locations. Each flag can include an ID tag and a contact target or a non-contact target. The maintenance vehicle can include an ID tag reader and a sensor configured to detect the contact target or the non-contact target. The method also can include driving the maintenance vehicle along the track to a position adjacent to a flag of the plurality of flags, reading by the ID tag reader the ID tag of that flag, and sensing by the sensor the contact target or the non-contact target. The method also can include, based on the reading and the sensing, identifying a unique location of the maintenance vehicle in the solar power field.

Abstract: Under one aspect, a system is provided for rotating photovoltaic modules arranged in a row. The system can include an elongated structural member extending along and parallel to the row; protrusions coupled to the elongated structural member; an actuator; and drive mechanisms coupled to the photovoltaic modules. Actuation of the actuator can move the elongated structural member, the movement of the elongated structural member can move the protrusions, the movement of the protrusions can move the drive mechanisms, and the movement of the drive mechanisms can rotate the photovoltaic modules.

Abstract: Under one aspect, a system for cleaning an array of solar panels is provided. The system includes a drive system and a cleaning head that includes a fluid emitter configured to deposit fluid onto the solar panels; a wiper; a wiper support structure; and spaced first and second mechanical linkages that respectively couple first and second portions of the wiper to the wiper support structure partially independently of one another and partially independently of the wiper support structure such that the wiper sequentially substantially fully contacts each of the solar panels to wipe the deposited fluid from those solar panels as the drive system moves along the array.

Abstract: A method of locating a maintenance vehicle in a solar power field can include driving the maintenance vehicle on a track. A plurality of flags are coupled to the track at spaced locations. Each flag can include an ID tag and a contact target or a non-contact target. The maintenance vehicle can include an ID tag reader and a sensor configured to detect the contact target or the non-contact target. The method also can include driving the maintenance vehicle along the track to a position adjacent to a flag of the plurality of flags, reading by the ID tag reader the ID tag of that flag, and sensing by the sensor the contact target or the non-contact target. The method also can include, based on the reading and the sensing, identifying a unique location of the maintenance vehicle in the solar power field.

Abstract: A system for maintaining photovoltaic modules includes an elongated rail including first and second support surfaces and a first mounting surface disposed between the first and second support surfaces. An array of the photovoltaic modules is coupled to the first mounting surface and raised relative to the first and second support surfaces. A first vehicle can be disposed on the first and second support surfaces and can include a motor; a maintenance module selected from the group consisting of: a spray system configured to spray a product, and a remote inspection module; and first and second support legs suspending the maintenance module relative to the photovoltaic modules of the first array and being movably coupled to the first and second support surfaces so as to laterally and sequentially move the maintenance module in a direction parallel to the elongated rail responsive to actuation of the motor.

Abstract: Under one aspect, a system is provided for rotating photovoltaic modules arranged in a row. The system can include an elongated structural member extending along and parallel to the row; protrusions coupled to the elongated structural member; an actuator; and drive mechanisms coupled to the photovoltaic modules. Actuation of the actuator can move the elongated structural member, the movement of the elongated structural member can move the protrusions, the movement of the protrusions can move the drive mechanisms, and the movement of the drive mechanisms can rotate the photovoltaic modules.

Abstract: A system can include first and second stiffeners each coupled to a photovoltaic module, and first, second, third, and fourth legs. First and second joints rotatably couple the first and second legs to the first stiffener; and third and fourth joints rotatably couple the third and fourth legs to the second stiffener. A first crossbrace fixedly couples the first and second legs to one another; and a second crossbrace fixedly couples the third and fourth legs to one another. The first and second legs are rotatable about the first and second joints from a stowed position to an open position supporting the photovoltaic module, and the third and fourth legs are rotatable about the third and fourth joints from a stowed position to an open position supporting the photovoltaic module. At least one of the joints can include an electrical conductor coupled to the respective stiffener and leg.

Abstract: Under one aspect, a system is provided for rotating photovoltaic modules arranged in a row. The system can include an elongated structural member extending along and parallel to the row; protrusions coupled to the elongated structural member; an actuator; and drive mechanisms coupled to the photovoltaic modules. Actuation of the actuator can move the elongated structural member, the movement of the elongated structural member can move the protrusions, the movement of the protrusions can move the drive mechanisms, and the movement of the drive mechanisms can rotate the photovoltaic modules.