US20110061713A1 - Apparatuses and Methods to Reduce Safety Risks Associated with Photovoltaic Systems - Google Patents
Apparatuses and Methods to Reduce Safety Risks Associated with Photovoltaic Systems Download PDFInfo
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- US20110061713A1 US20110061713A1 US12/948,614 US94861410A US2011061713A1 US 20110061713 A1 US20110061713 A1 US 20110061713A1 US 94861410 A US94861410 A US 94861410A US 2011061713 A1 US2011061713 A1 US 2011061713A1
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- 238000000034 method Methods 0.000 title abstract description 9
- 235000014676 Phragmites communis Nutrition 0.000 claims description 16
- 230000003287 optical effect Effects 0.000 claims description 10
- 239000004065 semiconductor Substances 0.000 claims description 8
- 230000005669 field effect Effects 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims 4
- 230000005611 electricity Effects 0.000 claims 2
- 238000012544 monitoring process Methods 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 13
- 238000012423 maintenance Methods 0.000 description 7
- 238000013459 approach Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 231100000518 lethal Toxicity 0.000 description 2
- 230000001665 lethal effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910002065 alloy metal Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/02016—Circuit arrangements of general character for the devices
- H01L31/02019—Circuit arrangements of general character for the devices for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/02021—Circuit arrangements of general character for the devices for devices characterised by at least one potential jump barrier or surface barrier for solar cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/34—Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Definitions
- At least some embodiments disclosed herein relate to photovoltaic systems in general and, more particularly but not limited to, safety devices for the shipment, installation and/or maintenance of photovoltaic systems.
- a lethal voltage potential may be present.
- the possible voltage could be as high as 600 volts, while in Europe and the rest of the world this voltage could approach a kilovolt.
- Another recommendation is to install and/or service the photovoltaic panels at night when there is minimal risk of the panels being energized. This approach presents the potential safety risks associated from working in a poorly lighted environment.
- Apparatuses and methods to reduce safety risks associated with photovoltaic systems by providing a safety switch on a photovoltaic panel Some embodiments are summarized in this section.
- a photovoltaic panel includes: at least one photovoltaic cell; a connector to output energy from the photovoltaic panel; and a switch coupled between the at least one photovoltaic cell and the connector.
- the switch is configured to disconnect the at least one photovoltaic cell from the connector during installation of the photovoltaic panel, and to connect the at least one photovoltaic cell with the connector after installation of the photovoltaic panel.
- the photovoltaic panel further includes a junction box to host the connector, wherein the switch is integrated in the junction box.
- the switch includes a first conductive contactor, a second conductive contactor, and a removable portion which when removed connects the at least one photovoltaic cell with the connector.
- the removable portion may include a dielectric separator; when the dielectric separator is inserted between the first and second contactor, the switch is not connected; and when the dielectric separate is removed, the switch is connected.
- the first and second conductive contactors are spring loaded toward each other.
- the removable portion further includes a flag attached to the dielectric separator.
- the flag may have a visual indication of warning for electric shock.
- the switch includes a reed switch; and the removable portion includes a magnet.
- the reed switch may be a normally closed reed switch, or normally open reed switch.
- the switch includes an optical sensor to turn on or off the switch based on light detected by the optical sensor; and the removable portion includes a pull-tab configured to shield the optical sensor.
- the at least one photovoltaic cell may be used to power the optical sensor.
- the switch further includes a semiconductor switch device (e.g., a Field-Effect Transistor (FET)) or a relay.
- a semiconductor switch device e.g., a Field-Effect Transistor (FET)
- FET Field-Effect Transistor
- the switch includes a relay and a wiring connector to control the relay from a remote location.
- the photovoltaic panel further includes a circuit to detect a load from an inverter.
- the switch is to connect an output of the photovoltaic panel to the connector when the circuit detects a load from an inverter and to disconnect the output in absence of a load from an inverter.
- a photovoltaic panel module includes: a voltage module to adjust an output of a plurality of photovoltaic cells; and a switch coupled the voltage module to selectively provide the output.
- the voltage module outputs an alternating current (AC) output.
- the switch may include a semiconductor switch, a relay, a reed switch, a spring loaded switch, and/or an optical sensor to control a state of the switch.
- the photovoltaic panel module further includes connectors for wirings to control a state of the switch.
- the disclosure includes methods and apparatuses which perform these methods, including data processing systems which perform these methods, and computer readable media containing instructions which when executed on data processing systems cause the systems to perform these methods.
- FIG. 1 illustrates a solar panel having a safety switch according to one embodiment.
- FIGS. 2-5 illustrate a spring loaded safety switch for a photovoltaic panel according to one embodiment.
- FIGS. 6-7 illustrate a junction box with a reed switch for a photovoltaic panel according to one embodiment.
- FIG. 8 illustrates an optical sensor to control a safety switch for a photovoltaic panel according to one embodiment.
- FIG. 9 illustrates a solar panel having a safety switch controlled via auxiliary wiring according to one embodiment.
- One embodiment of the disclosure provides a method and system to reduce the safety risks during the shipment, installation and/or maintenance of photovoltaic systems, without introducing the risks associated with other approaches, such as covering them with an opaque material or working on them at night.
- safety protection is provided via the inclusion of a normally closed switch integral to the panel junction box or integral to the panel module when alternating current (AC) or direct current (DC) modules are used.
- AC alternating current
- DC direct current
- FIG. 1 illustrates a solar panel having a safety switch according to one embodiment.
- a solar panel 10 e.g., a photovoltaic panel
- includes at least one solar cell 12 e.g., a photovoltaic cell
- a voltage module 14 to adjust or regulate the output voltage (or in some other cases a current module to regulate current)
- a switch 16 to selectively isolate the solar cell 12 from the output connectors of the solar panel.
- the switch may be incorporated into regulator modules, such as voltage module 14 .
- the switch 16 is a normally closed switch. During the shipment, installation and/or maintenance, the switch 16 is placed in an open state to isolate the solar cell 12 from the output. After the installation or maintenance, the switch 16 is placed into a closed state to allow the solar cell 12 to energize the output connectors of the solar panel and to supply power through the output connectors of the solar panel.
- the switch 16 and the voltage module can be integrated into the junction box of the solar panel.
- the switch 16 is integrated with the voltage module 14 as a panel module.
- FIGS. 2-5 illustrate a spring loaded safety switch for a photovoltaic panel according to one embodiment.
- the switch includes two contactors 102 and 103 made of a conductive metal or plated hybrid.
- the contactors 102 and 103 are normally made of a spring alloy metal or have an integral spring plunger design (not shown).
- the contactors 102 and 103 are positioned or fixed in such a way that the two contacts 102 and 103 are spring loaded toward each other to maintain electrical continuity between the two contactors 102 and 103 .
- the switch is normally closed (NC) and not in a safe mode for installation or maintenance.
- a safe mode for installation or maintenance is achieved when the blade 104 is inserted between the two contactors 102 and 103 .
- the blade 104 is manufactured from a dielectric material and when inserted between the two contactors 102 and 103 there is no electrical continuity between the contactors 102 and 103 .
- the blade 104 may also have a flag 105 attached.
- the flag 105 could be red or some other highly visible color, to provide a visual indicator of the state of the panel.
- the panels and/or panel with integral modules would come shipped from the factory with the blade 104 and the flag 105 , where the blade 104 is inserted between the two contactors 102 and 103 .
- the panels would be installed and integrated with the blade 104 present and flag 105 visible.
- the installer would mount, secure, and plug in all of the connections in the system, including the grounding.
- the installer would remove the blades 104 at all those places indicated by the flags 105 .
- the spring loaded contactors 102 and 103 contact each other to provide an electric path from the photovoltaic cells to the output connectors of the photovoltaic panel.
- the blade(s) 104 and flag(s) 105 could be reinserted, aided by the tapered section 207 of the blade 104 , thereby breaking the electrical continuity between the contactors 102 and 103 at point 206 .
- contactors 102 and 103 there is symmetry in contactors 102 and 103 .
- the contactors 102 and 103 are not identical or even similar.
- the contactors 102 and 103 are made of electrically conductive material and configured to be in physical contact with each so that an electrically conductive path 206 is maintained, after the blade 104 is removed.
- the electrical conductive path 206 is maintained without the blade 104 being inserted between the contactors 102 and 103 , then disrupted by the blade 104 inserted between the contactors 102 and 103 , and then reestablished by the reinsertions of a dielectric device such as the blade 104 .
- the flags could also provide information in the form of text, such as, for example, “Remove before operation” or a warning of potentially lethal voltage.
- FIG. 4 illustrates a configuration of a spring loaded switch integrated with a junction box 308 of a photovoltaic panel.
- the junction box 308 includes a connector to connect the solar power generated by the photovoltaic panel to a load (e.g., an inverter, a voltage bus, etc.) via a cable 307 .
- a load e.g., an inverter, a voltage bus, etc.
- the blade 104 is inserted into the switch, with the flag 105 visible, the voltage generated by the solar cells is isolated from the connector for the cable 307 ; and thus it is safe to install the photovoltaic panel or to perform maintenance operations on the photovoltaic panel.
- FIG. 5 shows the components of the spring loaded switch and the junction box of a photovoltaic panel.
- the junction box 308 has an opening 409 , which provides access to remove the blade 104 and/or to re-insert the blade 104 .
- the contactors 103 of the switch can be attached to the junction box 308 via fastening the portion 401 to a supporting member of the junction box 308 , such as a printed circuit board (PCB).
- PCB printed circuit board
- FIGS. 6-7 illustrate a junction box with a reed switch for a photovoltaic panel according to one embodiment.
- FIG. 6 shows an assembly of a reed switch 510 and magnets for integrated into the photovoltaic junction box 308 .
- FIG. 7 shows a cut-away section illustrating the reed switch 510 and the magnets 511 and 512 installed within the portion 509 of the junction box 308 .
- a reed switch 510 is made normally closed by integrating a stationary biasing magnet 511 into the junction box 308 in close proximity to the normally open reed switch, so that the switch 510 is closed in absence of the magnet 512 .
- the magnet 512 is inserted into the junction box well 509 so that the reversed polarity cancels the magnetic lines of force and the reed switch 510 opens.
- the magnet 512 is installed in the junction box well 509 at the factory; and a flag 105 (not shown in FIGS. 6 and 7 ) is attached to the magnet 512 .
- the magnet 512 is removable and/or re-insertable via the junction box well 509 .
- normally closed (NC) reed contacts can be used to replace the normally open (NO) reed contacts 510 and the magnet 511 , avoiding the need for the additional stationary magnet.
- the magnet 512 is removed and may be discarded.
- the power leads of the junction box 308 can then be energized via the semiconductor switch or relay (not shown), when the reed switch 512 is in the closed state.
- a semiconductor switch (not shown in FIG. 7 ) can be used to energize the power leads of the junction box 308 .
- the panel junction box 308 or inverter may include a controller unit with a watchdog circuit configured to send a signal periodically (e.g., every time interval t) to maintain the connection of the panel outputs to the string. When this signal is timed-out or is absent, the panel outputs of the panel are disconnected via a semiconductor switch device (not shown).
- FIG. 8 illustrates an optical sensor to control a safety switch for a photovoltaic panel according to one embodiment.
- an optical sensor unit 700 with an optical sensor 701 is mounted on a printed circuit board (PCB) 711 .
- PCB printed circuit board
- springs 702 and 712 hold a separator 703 in place that can be removed in direction of arrow 704 using a pull-tab similar to the flag 105 discussed earlier.
- the exterior enclosure that would contain the mechanical elements such as the cable connections and the guide elements for guiding separator 703 in and out of the unit.
- additional circuitry (not shown in FIG. 8 ) will be on the side of the PCB 711 , such as a control circuit to affect an on/off switching either in some cases by FET (Field-Effect Transistor) transistors or using, in other cases, a relay, such as a bi-stable relay or another suitable circuit.
- FET Field-Effect Transistor
- a relay such as a bi-stable relay or another suitable circuit.
- the operational power may be drawn from the solar system itself, or it may be brought up by auxiliary wiring.
- a relay can be simply remote controlled by an auxiliary wire to close or open the circuit.
- the advantage of this approach is that no pull-tabs (flags or blades) can be forgotten on the roof.
- a mechanism and/or circuitry is integrated in the panel to identify the load from the inverter and connect the panel to the panel outputs when the load is detected. When no load is present the panel outputs is disconnected.
- This functionality would also be implemented using a semiconductor switch device or other suitable device (such as a relay), and some sensor circuitry, allowing an automatic reconnect when the loop appears to be closed and a load connected.
- FIG. 9 illustrates a solar panel having a safety switch controlled via auxiliary wiring according to one embodiment.
- a separate wire is connected to control the switch 16 from a remote location.
- the switch may be controlled via a signal from a watchdog circuit, from a remote switch or controller, etc.
Abstract
Description
- The present application is a continuation application of U.S. patent application Ser. No. 12/254,780, filed Oct. 20, 2008, which claims priority to provisional U.S. Pat. App. Ser. No. 61/001,587, filed on Nov. 2, 2007 and entitled “Photovoltaic Safety Switch,” the disclosures of which applications are hereby incorporated herein by reference.
- The present application is related to U.S. Pat. No. 7,807,919, issued Oct. 5, 2010 and entitled “Apparatuses and Methods to Reduce Safety Risks Associated with Photovoltaic Systems.”
- At least some embodiments disclosed herein relate to photovoltaic systems in general and, more particularly but not limited to, safety devices for the shipment, installation and/or maintenance of photovoltaic systems.
- When a photovoltaic panel or laminate is exposed to direct or diffuse light, a lethal voltage potential may be present. In the United States the possible voltage could be as high as 600 volts, while in Europe and the rest of the world this voltage could approach a kilovolt.
- Because of this potential danger from electrical shock, solar panel manufacturers and code and standards development organizations have made some recommendations to minimize or eliminate this danger.
- One suggestion has been to cover the photovoltaic panel with an opaque material such as a tarpaulin. However, this approach proposes its own safety risk from having the wind catch the tarpaulin and pull installation personnel off the roof as they try to control the unstable sheet material against the wind.
- Another recommendation is to install and/or service the photovoltaic panels at night when there is minimal risk of the panels being energized. This approach presents the potential safety risks associated from working in a poorly lighted environment.
- In addition to the potential personnel safety issues there are also significant risks to equipment and hardware. Connecting or disconnecting energized plugs can cause arcing and damage to these connectors, junction boxes, and other electrical components.
- Apparatuses and methods to reduce safety risks associated with photovoltaic systems by providing a safety switch on a photovoltaic panel. Some embodiments are summarized in this section.
- In one embodiment, a photovoltaic panel includes: at least one photovoltaic cell; a connector to output energy from the photovoltaic panel; and a switch coupled between the at least one photovoltaic cell and the connector. The switch is configured to disconnect the at least one photovoltaic cell from the connector during installation of the photovoltaic panel, and to connect the at least one photovoltaic cell with the connector after installation of the photovoltaic panel.
- In one embodiment, the photovoltaic panel further includes a junction box to host the connector, wherein the switch is integrated in the junction box.
- In one embodiment, the switch includes a first conductive contactor, a second conductive contactor, and a removable portion which when removed connects the at least one photovoltaic cell with the connector. For example, the removable portion may include a dielectric separator; when the dielectric separator is inserted between the first and second contactor, the switch is not connected; and when the dielectric separate is removed, the switch is connected. In one embodiment, the first and second conductive contactors are spring loaded toward each other.
- In one embodiment, the removable portion further includes a flag attached to the dielectric separator. The flag may have a visual indication of warning for electric shock.
- In one embodiment, the switch includes a reed switch; and the removable portion includes a magnet. The reed switch may be a normally closed reed switch, or normally open reed switch.
- In one embodiment, the switch includes an optical sensor to turn on or off the switch based on light detected by the optical sensor; and the removable portion includes a pull-tab configured to shield the optical sensor. The at least one photovoltaic cell may be used to power the optical sensor.
- In one embodiment, the switch further includes a semiconductor switch device (e.g., a Field-Effect Transistor (FET)) or a relay.
- In one embodiment, the switch includes a relay and a wiring connector to control the relay from a remote location.
- In one embodiment, the photovoltaic panel further includes a circuit to detect a load from an inverter. The switch is to connect an output of the photovoltaic panel to the connector when the circuit detects a load from an inverter and to disconnect the output in absence of a load from an inverter.
- In one embodiment, a photovoltaic panel module includes: a voltage module to adjust an output of a plurality of photovoltaic cells; and a switch coupled the voltage module to selectively provide the output. In one embodiment, the voltage module outputs an alternating current (AC) output. The switch may include a semiconductor switch, a relay, a reed switch, a spring loaded switch, and/or an optical sensor to control a state of the switch.
- In one embodiment, the photovoltaic panel module further includes connectors for wirings to control a state of the switch.
- The disclosure includes methods and apparatuses which perform these methods, including data processing systems which perform these methods, and computer readable media containing instructions which when executed on data processing systems cause the systems to perform these methods.
- Other features will be apparent from the accompanying drawings and from the detailed description which follows.
- The embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings in which like references indicate similar elements.
-
FIG. 1 illustrates a solar panel having a safety switch according to one embodiment. -
FIGS. 2-5 illustrate a spring loaded safety switch for a photovoltaic panel according to one embodiment. -
FIGS. 6-7 illustrate a junction box with a reed switch for a photovoltaic panel according to one embodiment. -
FIG. 8 illustrates an optical sensor to control a safety switch for a photovoltaic panel according to one embodiment. -
FIG. 9 illustrates a solar panel having a safety switch controlled via auxiliary wiring according to one embodiment. - The following description and drawings are illustrative and are not to be construed as limiting. Numerous specific details are described to provide a thorough understanding. However, in certain instances, well known or conventional details are not described in order to avoid obscuring the description. References to one or an embodiment in the present disclosure are not necessarily references to the same embodiment; and, such references mean at least one.
- One embodiment of the disclosure provides a method and system to reduce the safety risks during the shipment, installation and/or maintenance of photovoltaic systems, without introducing the risks associated with other approaches, such as covering them with an opaque material or working on them at night.
- In one embodiment, safety protection is provided via the inclusion of a normally closed switch integral to the panel junction box or integral to the panel module when alternating current (AC) or direct current (DC) modules are used.
-
FIG. 1 illustrates a solar panel having a safety switch according to one embodiment. InFIG. 1 , a solar panel 10 (e.g., a photovoltaic panel) includes at least one solar cell 12 (e.g., a photovoltaic cell) to generate power when exposed to direct or diffuse light, in some cases avoltage module 14 to adjust or regulate the output voltage (or in some other cases a current module to regulate current), and aswitch 16 to selectively isolate thesolar cell 12 from the output connectors of the solar panel. In yet other cases, the switch may be incorporated into regulator modules, such asvoltage module 14. - In one embodiment, the
switch 16 is a normally closed switch. During the shipment, installation and/or maintenance, theswitch 16 is placed in an open state to isolate thesolar cell 12 from the output. After the installation or maintenance, theswitch 16 is placed into a closed state to allow thesolar cell 12 to energize the output connectors of the solar panel and to supply power through the output connectors of the solar panel. - The
switch 16 and the voltage module can be integrated into the junction box of the solar panel. In some embodiment, theswitch 16 is integrated with thevoltage module 14 as a panel module. -
FIGS. 2-5 illustrate a spring loaded safety switch for a photovoltaic panel according to one embodiment. InFIGS. 2-5 , the switch includes twocontactors contactors contactors contacts contactors - In
FIG. 2 , a safe mode for installation or maintenance is achieved when theblade 104 is inserted between the twocontactors blade 104 is manufactured from a dielectric material and when inserted between the twocontactors contactors - As illustrated in
FIG. 2 , theblade 104 may also have aflag 105 attached. Theflag 105 could be red or some other highly visible color, to provide a visual indicator of the state of the panel. - In one embodiment, the panels and/or panel with integral modules would come shipped from the factory with the
blade 104 and theflag 105, where theblade 104 is inserted between the twocontactors blade 104 present andflag 105 visible. The installer would mount, secure, and plug in all of the connections in the system, including the grounding. - As illustrated in
FIG. 3 , once the installation is completed the installer would remove theblades 104 at all those places indicated by theflags 105. Once theblade 104 is removed, the spring loadedcontactors - If additional work or troubleshooting were needed, the blade(s) 104 and flag(s) 105 could be reinserted, aided by the tapered
section 207 of theblade 104, thereby breaking the electrical continuity between thecontactors point 206. - In some embodiments, there is symmetry in
contactors contactors contactors conductive path 206 is maintained, after theblade 104 is removed. In at least some embodiments, the electricalconductive path 206 is maintained without theblade 104 being inserted between thecontactors blade 104 inserted between thecontactors blade 104. - In addition to the visual indication of the modes of the panels provided by the flag(s) 105, the flags could also provide information in the form of text, such as, for example, “Remove before operation” or a warning of potentially lethal voltage.
-
FIG. 4 illustrates a configuration of a spring loaded switch integrated with ajunction box 308 of a photovoltaic panel. Thejunction box 308 includes a connector to connect the solar power generated by the photovoltaic panel to a load (e.g., an inverter, a voltage bus, etc.) via acable 307. Thus, when theblade 104 is inserted into the switch, with theflag 105 visible, the voltage generated by the solar cells is isolated from the connector for thecable 307; and thus it is safe to install the photovoltaic panel or to perform maintenance operations on the photovoltaic panel. -
FIG. 5 shows the components of the spring loaded switch and the junction box of a photovoltaic panel. As illustrated inFIG. 5 , thejunction box 308 has anopening 409, which provides access to remove theblade 104 and/or to re-insert theblade 104. Thecontactors 103 of the switch can be attached to thejunction box 308 via fastening theportion 401 to a supporting member of thejunction box 308, such as a printed circuit board (PCB). -
FIGS. 6-7 illustrate a junction box with a reed switch for a photovoltaic panel according to one embodiment.FIG. 6 shows an assembly of areed switch 510 and magnets for integrated into thephotovoltaic junction box 308.FIG. 7 shows a cut-away section illustrating thereed switch 510 and themagnets portion 509 of thejunction box 308. - In
FIG. 7 , areed switch 510 is made normally closed by integrating astationary biasing magnet 511 into thejunction box 308 in close proximity to the normally open reed switch, so that theswitch 510 is closed in absence of themagnet 512. - In one embodiment, the
magnet 512 is inserted into the junction box well 509 so that the reversed polarity cancels the magnetic lines of force and thereed switch 510 opens. - In one embodiment, the
magnet 512 is installed in the junction box well 509 at the factory; and a flag 105 (not shown inFIGS. 6 and 7 ) is attached to themagnet 512. Themagnet 512 is removable and/or re-insertable via the junction box well 509. - In other embodiments, normally closed (NC) reed contacts can be used to replace the normally open (NO)
reed contacts 510 and themagnet 511, avoiding the need for the additional stationary magnet. - Once the installation and integrations are complete the
magnet 512 is removed and may be discarded. The power leads of thejunction box 308 can then be energized via the semiconductor switch or relay (not shown), when thereed switch 512 is in the closed state. - In some cases, a semiconductor switch (not shown in
FIG. 7 ) can be used to energize the power leads of thejunction box 308. Thepanel junction box 308 or inverter (not shown inFIG. 7 ) may include a controller unit with a watchdog circuit configured to send a signal periodically (e.g., every time interval t) to maintain the connection of the panel outputs to the string. When this signal is timed-out or is absent, the panel outputs of the panel are disconnected via a semiconductor switch device (not shown). -
FIG. 8 illustrates an optical sensor to control a safety switch for a photovoltaic panel according to one embodiment. InFIG. 8 , anoptical sensor unit 700 with anoptical sensor 701 is mounted on a printed circuit board (PCB) 711. Additionally, springs 702 and 712 hold aseparator 703 in place that can be removed in direction ofarrow 704 using a pull-tab similar to theflag 105 discussed earlier. Not shown inFIG. 8 is the exterior enclosure that would contain the mechanical elements such as the cable connections and the guide elements for guidingseparator 703 in and out of the unit. - In one embodiment, additional circuitry (not shown in
FIG. 8 ) will be on the side of thePCB 711, such as a control circuit to affect an on/off switching either in some cases by FET (Field-Effect Transistor) transistors or using, in other cases, a relay, such as a bi-stable relay or another suitable circuit. The operational power may be drawn from the solar system itself, or it may be brought up by auxiliary wiring. - In yet some other embodiments, a relay can be simply remote controlled by an auxiliary wire to close or open the circuit. The advantage of this approach is that no pull-tabs (flags or blades) can be forgotten on the roof.
- In one embodiment, a mechanism and/or circuitry is integrated in the panel to identify the load from the inverter and connect the panel to the panel outputs when the load is detected. When no load is present the panel outputs is disconnected. This functionality would also be implemented using a semiconductor switch device or other suitable device (such as a relay), and some sensor circuitry, allowing an automatic reconnect when the loop appears to be closed and a load connected.
-
FIG. 9 illustrates a solar panel having a safety switch controlled via auxiliary wiring according to one embodiment. InFIG. 9 , a separate wire is connected to control theswitch 16 from a remote location. For example, the switch may be controlled via a signal from a watchdog circuit, from a remote switch or controller, etc. - In the foregoing specification, the disclosure has been described with reference to specific exemplary embodiments thereof. It will be evident that various modifications may be made thereto without departing from the broader spirit and scope as set forth in the following claims. The specification and drawings are, accordingly, to be regarded in an illustrative sense rather than a restrictive sense.
Claims (20)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/948,614 US20110061713A1 (en) | 2007-11-02 | 2010-11-17 | Apparatuses and Methods to Reduce Safety Risks Associated with Photovoltaic Systems |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US158707P | 2007-11-02 | 2007-11-02 | |
US12/254,780 US7884278B2 (en) | 2007-11-02 | 2008-10-20 | Apparatuses and methods to reduce safety risks associated with photovoltaic systems |
US12/948,614 US20110061713A1 (en) | 2007-11-02 | 2010-11-17 | Apparatuses and Methods to Reduce Safety Risks Associated with Photovoltaic Systems |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/254,780 Continuation US7884278B2 (en) | 2007-11-02 | 2008-10-20 | Apparatuses and methods to reduce safety risks associated with photovoltaic systems |
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IL205312A0 (en) | 2010-12-30 |
WO2009059028A3 (en) | 2009-08-06 |
US7807919B2 (en) | 2010-10-05 |
US20090133736A1 (en) | 2009-05-28 |
WO2009059028A2 (en) | 2009-05-07 |
EP2206159A4 (en) | 2014-09-03 |
ES2954070T3 (en) | 2023-11-20 |
CN101849292A (en) | 2010-09-29 |
CN101849292B (en) | 2013-07-10 |
US20090114263A1 (en) | 2009-05-07 |
AU2008318625A1 (en) | 2009-05-07 |
EP4243279A3 (en) | 2023-10-04 |
EP2206159A2 (en) | 2010-07-14 |
EP2206159B1 (en) | 2023-07-12 |
PL2206159T3 (en) | 2023-12-04 |
US7884278B2 (en) | 2011-02-08 |
EP4243279A2 (en) | 2023-09-13 |
JP2011503846A (en) | 2011-01-27 |
KR20100093072A (en) | 2010-08-24 |
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