Tiled solar module repair process
In an example, a method includes providing a photovoltaic string comprising a plurality of from 2 to 45 strips, each of the plurality of strips being configured in a series arrangement with each other, each of the plurality of strips being coupled to another one of the plurality of strips using an electrically conductive adhesive (ECA) material, detecting at least one defective strip in the photovoltaic string, applying thermal energy to the ECA material to release the ECA material from a pair of photovoltaic strips to remove the defective photovoltaic strip, removing any residual ECA material from one or more good photovoltaic strip, aligning the photovoltaic string without the damaged photovoltaic strip, and a replacement photovoltaic strip that replaces the defective photovoltaic strip, and curing a reapplied ECA material on the replacement photovoltaic strip to provide the photovoltaic string with the replacement photovoltaic strip.
1. A method of manufacturing a solar module apparatus comprising:
providing a first photovoltaic string, the first photovoltaic string comprising a first plurality of from 2 to 45 strips, each of the first plurality of strips being configured in a series arrangement with each other, each of the first plurality of photovoltaic strips having a substantially similar width and substantially similar length, the first photovoltaic string comprising a first bus bar and a second bus bar, each of the first plurality of strips being coupled to another one of the first plurality of strips using an electrically conductive adhesive (ECA) material to mechanically connect the first plurality of strips together;
providing a second photovoltaic string, the second photovoltaic string comprising a second plurality of from 2 to 45 strips, each of the second plurality of strips being configured in the series arrangement with each other, each of the second plurality of photovoltaic strips having the substantially similar width and substantially similar length, the second photovoltaic string comprising a third bus bar and a fourth bus bar, each of the second plurality of strips being coupled to another one of the second plurality of strips using the ECA material to mechanically connect the second plurality of strips together;
providing a diode device coupled in parallel between the first photovoltaic string and the second photovoltaic string;
detecting the presence of at least one defective photovoltaic strip in the first photovoltaic string not generating electrical current from application of electromagnetic radiation, based upon a bypass electrical current through the diode device;
applying thermal energy to the ECA material to change a state of the ECA material to release the ECA material from a pair of the photovoltaic strips to remove the at least one defective photovoltaic strip;
removing any residual ECA material from one or more good photovoltaic strips adjacent to the at least one defective photovoltaic strip in the photovoltaic string;
aligning the photovoltaic string without the at least one defective photovoltaic strip, and a replacement photovoltaic strip that replaces the at least one defective photovoltaic strip; and
curing a reapplied ECA material on the replacement photovoltaic strip to provide the photovoltaic string with the replacement photovoltaic strip.
2. The method of claim 1 wherein the aligning comprises:
aligning a first portion of the photovoltaic string to an alignment member;
applying the ECA material on the replacement photovoltaic strip;
aligning a second portion of the photovoltaic string to the replacement photovoltaic strip; and
curing the reapplied ECA material.
3. The method of claim 1 , wherein the ECA material is a thermosetting acrylate adhesive.
4. The method of claim 3 , wherein the ECA material is a heat cured adhesive that is loaded with conductive metal particles.
5. The method of claim 1 wherein the thermal energy is provided by conduction, convention, or radiation to a temperature ranging from 150 to 300 degrees Celsius.
6. The method of claim 5 , wherein the thermal energy is provided by conduction using a heat source that is heated to from 150 to 250 degrees Celsius.
7. The method of claim 1 , wherein each of the photovoltaic strips is derived from separating a solar cell into five strips of similar size and shape.
8. The method of claim 1 , wherein the defective photovoltaic strip has a defect consisting of at least one of a crack, a broken section, a bad electrical interconnect, a defective photovoltaic material, or short or open circuit.
9. The method of claim 1 , wherein detecting the presence of the at least one defective photovoltaic strip further includes:
applying DC power to the first bus bar and the second bus bar to initiate an emission of electromagnetic radiation from each of the photovoltaic strips;
capturing an image of the photovoltaic string to identify at least one of the photovoltaic strips that has a darker image and therefore a defective photovoltaic strip than a good photovoltaic strip to identify the defective photovoltaic strip.
10. The method of claim 9 , wherein the image is captured in an electromagnetic radiation range including infra-red.
11. The method of claim 10 , wherein the good photovoltaic strip emits a substantially even image that has been captured and is homogeneous along an entirety of a surface region of the good photovoltaic strip.
12. The method of claim 9 , wherein the DC power comprises a voltage ranging from 10 to 50 Volts and a current ranging from 0.5 to 10 Amps.
13. The method of claim 1 , wherein the photovoltaic string is configured with a plurality of photovoltaic strings in a module before a lamination process.
14. The method of claim 1 , wherein the thermal energy is provided selectively to localize heat to the ECA material, while maintaining other portions of the strip substantially free from thermal energy.
15. The method of claim 1 , wherein, after the thermal energy is applied to the ECA, mechanical force is applied to a joint which is bonded by the ECA material to mechanically separate the defective photovoltaic strip from a portion of the string that includes non-defective strips.
16. The method of claim 14 , wherein the portion of the string that includes non-defective strips is retained in a fixture, and the defective photovoltaic strip is exposed by an orifice of the fixture.
17. The method of claim 15 , wherein the thermal energy is applied to the joint by placing the joint in contact with a heated structure.
18. The method of claim 14 , wherein the mechanical force is a force moment that is applied by rotating the portion of the string that includes non-defective strips relative to the defective photovoltaic strip.
19. The method of claim 1 , wherein the replacement strip is an end strip of a second string portion comprising a plurality of non-defective strips.
20. The method of claim 1 , wherein the ECA bonds an upper surface of a first string to a backside surface of a second string in an overlapped joint.