Abstract: A single-axis solar tracker consisting of a series of A-frame shaped foundation with actuators attached to each leg that are connected at one end to a common rotating assembly supporting multiple solar panels. Concerted action of the actuators causes the common rotating assembly to rotate about an axis of rotation. The system may include a central torque tube supported by the series of A-frame foundations or a frame assembly that is hingedly attached to each A-frame foundation via a torque arm.

Abstract: The present invention relates to a passive microwave sounder for a satellite, having a fixed reflection plate.

Abstract: The solar heating apparatus has a base box and a main axle mounted on the base box. At least one mirror support arm is mounted orthogonal to the main axle and supports a plurality of mirrors. In a first embodiment, a circular plate on the side of the base box rotates the main axle to bank the mirrors to track azimuth and a belt or chain drive rotates the mirror support arms to track elevation. In a second embodiment, the main axle is a beam mounted on a rotating circular plate on top of the base box to track azimuth and bevel gears drive a belt or chain drive that rotates the mirror support arms to track elevation. In a third embodiment, the mirror support arms are driven to rotate by bevel gears and the main axle through belt or chain drives.

Abstract: Provided are a circuit configuration optimization apparatus and a machine learning device capable of reducing the occurrence frequency of a malfunction based on one of the current position and the current time of a FPGA device. The circuit configuration optimization apparatus includes: a state data acquisition section that acquires at least one of a current position and current time of the FPGA device as state data; and a circuit configuration determination section that determines a circuit configuration of the FPGA device based on the state data acquired by the state data acquisition section, and outputs a command value for reconfiguring the determined circuit configuration on the FPGA device.

Abstract: A solar panel array is formed of a plurality of solar panels juxtaposed with one another along an array axis, and has a support element having first and second support terminations disposed substantially orthogonal to the array axis, with an unobstructed spatial region intermediate of the first and second support terminations. A vehicle transports the solar panels and has wheels arranged on opposing sides thereof. First and second track structures extend along the array axis and are coupled to respective ones of the first and second support terminations. The track structures each have an elongated portion for engaging and supporting respective ones of the vehicle wheels, whereby the vehicle travels along the tracks while carrying a solar panel, and at least a portion of the vehicle is disposed within the unobstructed spatial region. One of the tracks accommodates the wiring for the solar panel array.

Abstract: The invention is a system and method for heliostat mirror control. Here, each heliostat mirror generates a low intensity “signal beam”, directed at an angle off from the heliostat mirror's high intensity and sensor blinding “main beam” of reflected solar energy. The low intensity signal beams may be created by reflecting a small portion of the incident solar light at an angle from the main beam, by reflected artificial light, or from lasers shinning onto mirrors from known locations. The signal beams are detected by optical sensors mounted way from the main heliostat receiver focus, and can be used in a closed loop control system to efficiently ensure that individual heliostat mirrors in a heliostat array accurately track sunlight and direct the sunlight to a central receiver. Because heliostat mirrors need not be taken “off sun” for positioning, the system allows heliostat arrays to be run at high efficiency.

Abstract: A solar tower system including an array of individually controlled carousel-type heliostats, where each heliostat includes a rotatable D-shaped carousel, a mirror array including horizontal, elongated flat mirrors supported in a tiltable (e.g., louvered) arrangement on the carousel, and a mirror positioning system that is disposed next to the carousel and controls the tilt position of each mirror and a rotational position of the carousel to reflect light onto a solar receiver. The heliostats are arranged in a closely-spaced (e.g., square or hexagonal) pattern that both maximizes the effective ground coverage ratio of solar power harvesting system and facilitates the formation of service pathways that allow access to any of the heliostats in the array (e.g., by aligning the straight peripheral wall portions of adjacent carousels in parallel with each other).

Abstract: Methods and systems for use with solar devices. The present invention may be used with solar panels, solar dishes, or any other devices for which an optimal exposure to the sun is desired. The present invention first adjusts an azimuth of the solar device until an optimal solar exposure, from an azimuth point of view, is achieved. Then, an altitude of the solar collector is adjusted until an optimal solar exposure, from an altitude point of view, is achieved. The invention also uses a load compensation mean to alleviate the amount of lifting or braking torque needed from the motor to tilt the solar collector.

Abstract: Adherence to flux or resultant measurable parameter limits, ranges, or patterns can be achieved by directing heliostat mounted mirrors to focus on aiming points designated on the surface of a solar receiver. Different heliostats can be directed to different aiming points, and a heliostat can be directed to different aiming points at different times. The cumulative flux distribution resulting from directing a plurality of heliostats to any aiming point on a receiver surface can be predicted by using statistical methods to calculate the expected beam projection for each individual heliostat or alternatively for a group of heliostats. Control of the heliostats in a solar power system can include designating aiming points on a receiver from time to time and assigning heliostats to aiming points from time to time in accordance with an optimization goal.

Abstract: A solar tracking device including a solar panel, an orientation control device, and an inclination sensing device is provided. The solar panel is suitable for converting solar energy into electric energy. The orientation control device controls an orientation of the solar panel according to the position and time of the solar panel. The inclination sensing device is disposed on the solar panel for detecting an inclination direction of the solar panel. The inclination sensing device is suitable for outputting a feedback signal to the orientation control device to adjust the orientation of the solar panel. The solar tracking device has a simple tracking mechanism because of a simple feedback mechanism of the inclination sensing device.

Abstract: A method for automated startup and/or for automated operation of controllers of an electrical drive system with vibrational mechanics with the following steps: (a) determining a preliminary value of at least one parameter; (b) determining a model of the electrical drive system by determination of initially a non-parameterized model through the recording of frequency data during operation of the drive system subject to the utilization of the preliminary value of at least one parameter and the subsequent determination of parameters of the electrical drive system based on the frequency data and subject to optimization of at least one preliminary value of at least one parameter by a numerical optimization method on the basis of the Levenberg-Marquardt algorithm and (c) parameterizing at least one controller of the electrical drive system by at least one of the determined parameters.

Abstract: A system is disclosed, consisting of scalable array of distributed and networked control systems such as small heliostats, and orthogonal trackers capable of precise sun-position measurements, directing incident solar radiation to one or more predetermined targets. A method for implementing a scalable heliostat array for use in solar-energy applications, telescopy, etc., is also disclosed.

Abstract: This invention presents a unique design for a sun tracking, solar panel mounting system that is intended to be mounted onto utility light poles, wind turbine poles, and other pole type structures. Rings are clamped around the pole and form a structural interface to support the tracking mount assembly and allow it to rotate around the centerline of the pole. An actuator powers the tracking structure rotate right or left around the centerline of the pole. A secondary structure in the mount assembly supports solar panels on either side of the vertical mounting poll and an optional second actuator tilts the elevation solar panels up and down. A control system reads the position of each actuator and periodically adjusts them to track the motion of the sun and optimize the solar energy collection efficiency.

Abstract: A solar-tower system includes a raised solar receiver disposed on a tower and a mirror array including multiple flat mirrors for reflecting sunlight onto the raised receiver. The mirror array is disposed on a carousel-type platform that is rotatable around a vertical axis, and the raised receiver is maintained at a substantially fixed position relative to the mirror array for all rotational positions of the platform. A solar azimuth tracking controller controls the platform's rotational position to track the sun's azimuth angle such that sunlight shines on the mirror array from a fixed apparent azimuth angle at all times during daylight hours. Each flat mirror pivots around a corresponding unique axis, and a solar elevation tracking controller individually controls each mirror's pivot position to track the sun's elevation angle such that sunlight is accurately reflected onto the raised solar receiver at all times during daylight hours.

Abstract: A method for harvesting solar power by concentrating sunlight onto a raised solar receiver disposed on a tower. The method involves rotating a mirror array made up of multiple flat mirrors as a unit around a vertical axis such that sunlight shines on the mirror array from a fixed apparent azimuth angle at all times during daylight hours, and controlling each mirror's pivot position to track the sun's elevation angle such that sunlight is accurately reflected onto the raised solar receiver at all times during daylight hours. In one embodiment the mirror array is disposed on a roundabout-type platform whose rotational position is controlled to track the sun's azimuth angle and the raised receiver is maintained at a substantially fixed position relative to the mirror array for all rotational positions of the platform.

Abstract: The alignment of a parabolic trough reflector and its receiver pipe in a solar thermal field for collecting sunlight energy can be verified by acquiring an aerial image of the parabolic trough reflector from above the thermal field while passing through the sun-receiver-vertices plane of the parabolic trough reflector. By analyzing the aerial image to determine whether any reflection of the sun is visible in the parabolic trough reflector in the aerial image, one can determine whether the parabolic trough reflector and its receiver pipe is properly aligned. If a reflection of the sun is visible in the parabolic trough reflector in the aerial image, the parabolic trough reflector and its receiver pipe are out of alignment and require an adjustment.

Abstract: A solar tracking and concentration device, including at least one reflecting unit, a receiving unit, a controlling device, and a sensing device, is provided. The reflecting unit having a reflecting surface reflects and concentrates sunlight. The receiving unit having a receiving surface is used to receive the sunlight reflected and reflected by the reflecting unit. The receiving unit and the reflecting unit face each other. According to the position and the time of the reflecting unit, the controlling device controls a rotation angle of the reflecting unit. The sensing device on the receiving unit may detect an inclination direction of the reflecting unit and output a first feedback signal to the controlling device to calibrate a direction of the reflecting unit facing the sun.

Abstract: Disclosed is a controlling apparatus for use in a photovoltaic system. The photovoltaic system includes a solar cell array, an inverter and a solar tracker. The solar tracker includes a solar position sensor, a controller connected to the solar position sensor, a first motor connected to the controller for rotating the solar cell array according to the azimuth of the sun and a second motor connected to the controller for tilting the solar cell array according to the elevation of the sun. The controlling apparatus includes a central unit, a basic unit, a diagnosis unit, a maintenance unit, a security unit and a check unit.

Abstract: A system and method for tracking a position of the Sun includes a solar tracker controller that generates directional control signals responsive to sensing signals. A solar tracking algorithm controls operation of the solar tracker controller responsive to the sensing signals. The solar tracking algorithm includes a rough tracking mode of operation for causing a pointing axis of at least one solar receiver to point generally in a direction of the Sun as indicated by the sensing signals. A searching mode of operation positions the at least one solar receiver such that sunlight falls on at least one solar cell of the receiver. A fine tracking mode of operation positions a pointing axis of the at least one solar receiver responsive to the feedback signal from the at least one solar receiver.

Abstract: A machine for tracking the sun's movement and concentrating sunlight consists of a main frame which pivots in the north and south direction on a base having conduit for a heat medium (a liquid usually of the Glycol family the main frame supports the mirror frame that pivots 360 degrees East to West allowing the mirror to focus the sunlight onto the conduit heating the liquid medium producing a very high and concentrated amount of heat during the entire daylight period and can be used for a small business or residential heating. An optional prism can be attached to the mirror frame to focus sun rays onto the conduit for added heat.

Abstract: An exemplary heat-distribution sensor includes a base and a number of thermocouples. The base includes a spherical surface and defines a number of receiving holes in the spherical surface. Each thermocouple has a sensing end which is received in a corresponding receiving hole and is configured for sensing heat generated by sunlight rays impinging on the sensing end.

Abstract: When using a solar concentrator to obtain energy collected from the sun, it can be beneficial to place the concentrator accurately. As the concentrator moves, a position of the concentrator with respect to gravity can be determined, such as through the use of an inclinometer. A comparison can be made of the determined position against a desired position. The comparison can be made to determine if the concentrator should move. If a positive determination is made, then the concentrator can be moved accordingly.

Abstract: A solar energy system includes a support member secured to a substantially fixed location; a solar energy member mounted to the support member and including a surface operable to track in response to movement of the Sun; an actuator assembly coupled to the solar energy member and configured to periodically apply a torque at a first frequency to move the solar energy member in response to movement of the Sun; and a damper assembly including a spool, where the damper assembly is configured to reactively release and retract a cable about the spool in response to changes in the steady state load, and maintain the cable at a substantially fixed length released from the spool in response to a torque at a second frequency greater than the first frequency that is intermittently received by the solar energy member.

Abstract: An improved tracking device comprised of a lightweight structural design optimized to carry it's own mass, that mass of a lightweight incident surface or surfaces for reflecting or absorbing energy, and to withstand the forces of low to medium wind loads. A weathervaning stowage mode is initiated under high wind conditions that will inherently rotate the structure such that the reflective facets will face away from the oncoming wind and any entrained dust, hail, or other particulate. The incident surfaces will also pivot upwards via pivots near the top mounting point to reduce the surface area presented to the wind and the resultant aerodynamic forces. A fixed wind deflector is employed to transfer wind load from the top of the incident surface(s) above the point of rotation where the wind load inhibits rotation to the bottom of the facet where upward rotation is enhanced.

Abstract: The invention relates to a reflection device that can track the location of sun, focusing solar radiation on a radiation receiver. The tracking is controlled by means of an auxiliary mirror guiding an auxiliary beam to a target. The position of the point of incidence of the auxiliary beam on the target is detected by a video camera and an image capture system, and said actual position is adjusted to a prescribed target position. It is thus achieved that the main beam is always precisely aimed at the radiation receiver.

Abstract: A solar tracking and concentration device, including at least one reflecting unit, a receiving unit, a controlling device, and a sensing device, is provided. The reflecting unit having a reflecting surface reflects and concentrates sunlight. The receiving unit having a receiving surface is used to receive the sunlight reflected and reflected by the reflecting unit. The receiving unit and the reflecting unit face each other. According to the position and the time of the reflecting unit, the controlling device controls a rotation angle of the reflecting unit. The sensing device on the receiving unit may detect an inclination direction of the reflecting unit and output a first feedback signal to the controlling device to calibrate a direction of the reflecting unit facing the sun.

Abstract: A solar thermal panel is disclosed. An example evacuated flat solar thermal panel includes a first evacuated cavity enclosed between first and second layers of material. A second evacuated cavity is enclosed between third and fourth layers of material. A high temperature working fluid cavity is enclosed between the second and third layers of material. A plurality of pillars are disposed between the first and second layers of material, and disposed between the third and fourth layers of material.

Abstract: System for adjusting solar cell modules of a solar installation according to the sun's position, comprising a drive device for a group of drive units, for adjusting the solar cell modules, wherein a control unit is associated with each drive unit, and the drive units are connected to a shared power supply as well as a data bus, wherein the group of control units are connected via a shared power and data transmission line to a bus coupler, the bus coupler is coupled to the power supply for coupling energy, as well as to the data bus for coupling data, into the power and data transmission line, and one of the control units is designed as master control unit, and the additional control units of the group are designed as slave control units, and controllable via the power and data line by means of the master control unit.

Abstract: The present invention provides a solar tracking skylight system for illumination, primarily including a light guide, a solar tracking controller, a two-axis tracking mechanism, an energy converter and energy storage system, and a weather protective cover. The system uses the solar tracking controller to detect the direction of the light, thereby enabling the two-axis tracking mechanism to move toward the light to facilitate the light guide in collecting light and diffusing it indoors for illumination use. The protective cover provides waterproofing, and the energy converter and energy storage system is used to store electrical energy generated by the solar energy panel for system use. External power is not needed for the system to operate and provide indoor lighting, thereby achieving the objective of saving energy and reducing carbon emissions.

Abstract: Methods of operating solar tracking apparatuses are described. For example, a method includes determining a minimum amount of energy required to move the solar tracking apparatus from a first position to a second position. An available radiance is estimated for a solar resource coupled to the solar tracking apparatus. The solar tracking apparatus is moved from the first position to the second position prior to a point in time when the energy derivable from the available radiance is less than the minimum amount of energy required to move the solar tracking apparatus from the first position to the second position.

Abstract: Solar apparatus for concurrent heating and power-generation duty having a base load bearing structure and a load bearing structure supported on the base load bearing structure secured to the plant solar concentrator so as to allow rotation of the concentrator with an established maximum rotation angle, with both a first alternate rotation movement in a circular direction and a horizontal plane along the base load bearing structure, and a second alternate movement along a curved path around a vertical plane orthogonal to the horizontal plane. The solar concentrator is actuatable with said first and second movement during the day by respective first and second actuators, controlled by a microprocessor, depending on the corresponding orientations of the concentrator, detected by first and second sensors, in a manner to orientate the concentrator for receiving maximum solar radiation during the day.

Abstract: A system (100) for directing incident sun light to a receiver (150) based on an integral imager (116) is disclosed. The system includes an imager (116) mounted to a reflector (112); a tracking controller (226) coupled to the imager; and one or more actuators (114) connected to the reflector and tracking controller. The tracking controller (226) is configured to receive and process image data from the imager (116); determine angular positions of a radiation source and target relative to the mirror normal vector (N) based on the image data; and orient the reflector with the axis bisecting the angular positions of the sun and receiver (150). When the optical axis of the imager is precisely aligned with the vector normal to the reflector, the source and target will be detected as antipodal spots (320, 330) with respect to the center of the imager's field of view, which may be used to effectively track the sun or like object.

Abstract: A novel concentrator system is described, which increases the efficiency of collecting and concentrating sunlight energy onto a target. This method uses an array of small movable reflective or refractive concentrator components that can move via a feedback mechanism which tracks the sun and concentrates the suns energy on to a second array of energy converting elements. In order to improve the effective collected energy, the array of concentrator elements is placed on a moving or tiltable flat slab (or dish, substrate, plane, plate, holder, tablet, or similar flat or non-flat surface) that tracks the sun. An alternative method uses an array of target elements or linear elements and a second array of concentrator elements in harmony such that the suns energy is efficiently redistributed by the reflective or refractive array on to the energy converting array as the sun's position in the sky (elevation and azimuth) changes.

Abstract: Embodiments of the invention relate to an inclinometer for use in tracking movement of a moveable structure such as a solar array. The inclinometer includes a magnetometer for sensing changes in a magnetic field indicative of movement of the movable structure. This movement information is then used to determine a current position/orientation of the moveable structure. In the context of a solar array, this information is used to determine the current position/orientation of the solar array. In some embodiments where the movable structure is a solar array, sun position data either from a database listing sun position information for different times of day or data based on algorithmic calculations may be used to determine a difference between current position of the sun and a current position/orientation of the solar array. The solar array may then repositioned based on this determined difference.

Abstract: A portable PV modular solar generator. A plurality of wheels are attached to the bottom of a rechargeable battery container. At least one rechargeable battery is contained inside the rechargeable battery container. A power conditioning panel is connected to the rechargeable battery container. At least one photovoltaic panel is pivotally connected. In a preferred embodiment, the rechargeable battery container is a waterproof battery enclosure having a knife switch connection. A mast having a rotation bar is supported by the waterproof battery enclosure. At least one solar panel support brace for supporting the photovoltaic panel is attached to the rotation bar. The power conditioning panel is waterproof, is attached to the mast and has a door. When the door is opened, at least one safety switch is opened, breaking an electric circuit. The waterproof power conditioning panel has a charge controller and an inverter.

Abstract: Adherence to flux or resultant measurable parameter limits, ranges, or patterns can be achieved by directing heliostat mounted mirrors to focus on aiming points designated on the surface of a solar receiver. Different heliostats can be directed to different aiming points, and a heliostat can be directed to different aiming points at different times. The cumulative flux distribution resulting from directing a plurality of heliostats to any aiming point on a receiver surface can be predicted by using statistical methods to calculate the expected beam projection for each individual heliostat or alternatively for a group of heliostats. Control of the heliostats in a solar power system can include designating aiming points on a receiver from time to time and assigning heliostats to aiming points from time to time in accordance with an optimization goal.

Abstract: A mirror or other reflecting surface is used for collecting and reflecting incident solar radiation. The mirror is supported for independent motion about a pair of axes. An accelerometer generates signals representative of an amount and direction of motion of the mirror about each of the axes. Motors or other drive mechanisms independently drive the mirror about each of the axes. A tracking device provides information about the current position of the Sun. A control is connected to the accelerometer, the motors and the tracking device for maintaining a predetermined optimum orientation of the mirror as the Sun moves across the sky. Position sensors that sense the position of the mirror relative to the earth's magnetic field may also be employed.

Abstract: Systems and methods for a heliostat directing incident sun light to a receiver based on an estimate or predicted receiver location and an imaged sun location

Abstract: An exemplary heat-distribution sensor includes a base and a number of thermocouples. The base includes a spherical surface and defines a number of receiving holes in the spherical surface. Each thermocouple has a sensing end which is received in a corresponding receiving hole and is configured for sensing heat generated by sunlight rays impinging on the sensing end.

Abstract: A solar concentration system including at least one receiver and an array of micro-mirrors connected to a substrate, each micro-mirror of the array being articulateable relative to the substrate, wherein the receiver is positioned relative to the array such that the array directs incoming light to the receiver.

Abstract: An actuated feedforward controlled solar tracker system including a sub-frame supporting at least one solar panel, a post supporting the sub-frame, and a linking mechanism connecting the sub-frame and post, where the linking mechanism includes a first axle, second axle and body member. The linking mechanism's first and second axles are disposed orthogonal to each other and are separated by the body member. The system includes at least two linear actuators, a rotational joint connecting the linear actuators and sub-frame, and a driver system that drives the actuators. Additionally, the system includes a feedforward control system including a computer that calculates desired positions of the linear actuators using multiple inputs and communicates with the driver system to drive the linear actuators, and a feedback control system that relays information gathered by sensor devices to the feedforward control system, where the feedforward and feedback control systems function in an integrated manner.

Abstract: An actuated solar tracker that includes a sub-frame capable of supporting at least one solar panel, at least one post for supporting the sub-frame, and a linking mechanism that connects the sub-frame and post. The linking mechanism includes a first axle, second axle and body member that connects the first axle to the second axle. The first axle and the second axle of the linking mechanism are disposed substantially orthogonal to each other and are separated by the body member. The solar tracker also includes at least two linear actuators, each containing a first end and second end, a rotational joint connecting the second end of the linear actuators to the sub-frame, and a driver system that drives the linear actuators. The solar tracker includes a controller for calculating desired positions of the linear actuators and communicating with the driver system to drive the linear actuators to desired positions.

Abstract: A system may include acquisition of power information from a signal line in accordance with a first signal characteristic. The power information is associated with power generated by a solar collector, and the first signal characteristic is substantially orthogonal to a corresponding signal characteristic of at least one noise source associated with the signal line. In some aspects, a solar tracking error associated with the solar collector is determined based on the acquired power information, a servo feedback signal is determined based on the acquired power information, and determination of the solar tracking error includes determination of the solar tracking error based on the servo feedback signal.

Abstract: A solar energy collector includes a parabolic reflector, a solar panel, a photosensor panel, a projecting pointer, a solar location calculator, and a reflector mount. The parabolic reflector includes a parabolic reflecting surface. The solar panel includes a light receiving surface for facing the reflecting surface. The photosensor panel includes a light sensing surface. The projecting pointer is mounted on the photosensor panel. The solar location calculator is connected to the photosensor panel, and is configured for calculating the trajectory of the sun relative to a geographic location of the parabolic reflector according to the motion of a shadow of the projecting pointer on the light sensing surface sensed by the photosensor panel and generating a control signal associated therewith. The reflector mount is configured for supporting and moving the parabolic reflector in following movement of the sun in response to the control signal from the solar location calculator.

Abstract: The present invention provides a solar tracking apparatus for use with a power driving apparatus. The solar tracking apparatus includes: a memory unit for recording a first solar image; an image capturing unit for capturing a second solar image; and an processing unit for obtaining difference between the first solar image and the second solar image; wherein the processing unit activates the power driving apparatus in response to the difference. Furthermore, the present invention also provides a solar power generation system using the solar tracking apparatus. Besides the solar tracking apparatus, the solar power generation system also includes a solar panel; the power driving apparatus for adjusting the position of the solar panel, wherein the processing unit of the solar tracking apparatus activates the power driving apparatus based on the difference so that the solar panel is aligned with the sun to gather the solar energy of the sun.

Abstract: A method is provided for controlling the alignment of a heliostat with respect to a receiver, wherein an image sensor device is arranged on a mirror device of the heliostat, wherein the heliostat is aligned by the image sensor device using image recognition in such a way that a first angle of a first vector pointing towards the sun, relative to a prescribed vector of the mirror device, and a second angle of a second vector pointing towards a prescribed target area of the receiver, relative to the prescribed vector, are in a relationship to each other which is dependent upon the prescribed vector of the mirror device, and wherein images of the sun and the prescribed target area and their position relative to the prescribed vector are determined.

Abstract: An instrument for a solar energy system including a receiver and a heliostat to reflect solar energy on to the receiver. The instrument includes a first element adapted to form an image of the sun, a second element adapted to form an image of the receiver, and a detector. The detector is positioned to receive each of the images and a comparator is adapted to detect a distance between the images. The comparator generates an error correction signal based on the distance between the images. The error correction signal is received by a controller that controls the operation of a postioner that adjusts the position of the heliostat accordingly.

Abstract: A solar lighting apparatus of the sun tracking type for guiding sunlight into a building by using light reflecting means (30), the apparatus comprising the light reflecting means (30) for reflecting sunlight, drive means (60) for driving the light reflecting means, control means (70) for controlling the drive means to orient the light reflecting means toward the direction of the sun, and power source means (20) for supplying electric power to the drive means and the control means. The power source means (20) comprises a main power source unit (22) chargeable by a solar cell panel (40) for supplying electric power to the drive means (60) and the control means (70), and a backup secondary cell (24) chargeable with the electric power from the main power source unit for supplying electric power to the control means (70).

Abstract: A method, apparatus, control system and computer program product are provided for controllably positioning the solar concentrator. The method, apparatus, control system and computer program product determine the respective errors generated by more and different error sources than prior techniques, including error sources selected from the group consisting of a gravitational residue error, an elevation transfer function error and an error attributable to atmospheric refraction. Based upon the respective errors, the method, apparatus, control system and computer program product determine an elevation command and an azimuth command to compensate for the vertical error and the horizontal error between the centerline of the solar concentrator and the sun reference vector such that the solar concentrator can be more precisely positioned, thereby improving the efficiency with which the solar concentrator collects solar energy.

Abstract: A solar radiation concentrator rotated about a straight line vertical to the reflector arrangement surfaces so that the incident solar radiation can be led onto the reflector arrangement surface along the specified direction and a method of concentrating solar radiation; the concentrator, comprising a plurality of reflectors (10) disposed on reflector arrangement surfaces, a plurality of reflector vertical bars (20) connected to the plurality of reflectors, rotating center holding members (30) for holding the center points of the rotating motions of the plurality of reflector vertical bars, motion members (40) for collectively rotating the plurality of reflector vertical bars, and guide members (50) for guiding the motions of the plurality of reflector vertical bars so that the plurality of reflector vertical bars can be rotated along specified reflector vertical bar routes, wherein the motion members perform motions along the specified motion member routes according to a variation in the incident angle of th