Automated reel processes for producing solar modules and solar module reels
This specification describes automated reel processes for producing solar modules and solar module reels. In some examples, a method includes receiving a continuous feed of photovoltaic devices on a photovoltaic device sheet. The method includes locating and bypassing one or more defective photovoltaic devices on the photovoltaic device sheet. The method includes installing bussing for the photovoltaic devices on the photovoltaic device sheet. The method includes feeding the photovoltaic device sheet to an encapsulation system to output a photovoltaic module sheet.
1. A solar module reel comprising: a photovoltaic module sheet comprising:
a layer of a plurality of photovoltaic devices, each of the plurality of photovoltaic devices comprising crystalline silicon solar cells;
a plurality of jumpers around a first photovoltaic device comprising a cracked crystalline silicon solar cell, wherein the jumpers electrically connect a first adjacent photovoltaic device on a first side of the cracked crystalline silicon solar cell to a second adjacent photovoltaic device on a second side of the cracked crystalline silicon solar cell such that the jumpers electrically bypass the cracked crystalline silicon solar cell from an electrically connected string of solar cells, and wherein the first adjacent photovoltaic device is adjacent to the first side of the cracked crystalline silicon solar cell and the second adjacent photovoltaic device is adjacent to the second side of the cracked crystalline silicon solar cell;
a bypass diode electrically connected in parallel with the electrically connected string of solar cells including the cracked crystalline silicon solar cell;
bussing for the photovoltaic devices;
top and bottom layers of encapsulation;
and a reel;
wherein the photovoltaic module sheet is wound around the reel.
2. The solar module reel of claim 1 , wherein the photovoltaic module sheet comprises a metal backsheet and a front sheet formed of glass.
3. The solar module reel of claim 1 , wherein the bussing comprises a plurality of in-laminate diodes.
4. The solar module reel of claim 1 , wherein at least one of the top and bottom layers of encapsulation is formed of fiberglass-reinforced composite.
5. The solar module reel of claim 1 , wherein at least one of the top and bottom layers of encapsulation is formed of one or more layers of thermoset or thermoplastic polymers or both.
6. The solar module reel of claim 1 , comprising one or more of: a DC optimizer, a battery, and an inverter, integrated with the reel.
7. The solar module reel of claim 1 , comprising a plurality of strips extending along the photovoltaic module sheet, wherein the strips are configured to prevent the photovoltaic module sheet from bending by more than a minimum bend radius.
8. The solar module reel of claim 1 , wherein the photovoltaic module sheet comprises a backsheet patterned with holes that mirror outlets of the bussing.
9. The solar module reel of claim 1 , wherein the photovoltaic devices comprise a strip of shingled solar cells, a plurality of interdigitated back contact (IBC) solar cells, or a plurality of front contact solar cells.
10. The solar module reel of claim 1 , comprising an additional photovoltaic module sheet wound around the reel and arranged approximately side by side with the photovoltaic module sheet.
11. A solar module reel comprising:
a photovoltaic module sheet comprising a layer of a plurality of crackable crystalline silicon solar cell strips arranged in a shingled manner such that adjacent edges of adjacent ones of the crackable crystalline silicon solar cell strips overlap and top and bottom layers of encapsulation;
a plurality of jumpers around a first photovoltaic device of a first crackable crystalline silicon solar cell strip, the first photovoltaic device comprising a cracked crystalline silicon solar cell, wherein the jumpers electrically connect a first adjacent photovoltaic device on a first side of the cracked crystalline silicon solar cell to a second adjacent photovoltaic device on a second side of the cracked crystalline silicon solar cell such that the jumpers electrically bypass the cracked crystalline silicon solar cell from an electrically connected string of solar cells, and wherein the first adjacent photovoltaic device is adjacent to the first side of the cracked crystalline silicon solar cell and the second adjacent photovoltaic device is adjacent to the second side of the cracked crystalline silicon solar cell;
a bypass diode electrically connected in parallel with the electrically connected string of solar cells including the cracked crystalline silicon solar cell; and
a reel;
wherein the photovoltaic module sheet is wound around the reel.
12. The solar module reel of claim 11 wherein the photovoltaic module sheet comprises one or more bussing ribbon.
13. The solar module reel of claim 12 wherein the bussing comprises a plurality of in-laminate diodes.
14. The solar module reel of claim 12 wherein the one or more bussing ribbon includes a return line connecting module level electronics.
15. The solar module reel of claim 11 wherein the photovoltaic module sheet comprises a mechanical separation point to provide a customized voltage length.
16. The solar module reel of claim 15 wherein the customized voltage length comprises N >25 solar cell strips, with no single solar cell strip in the group of <N solar cells individually electrically connected in parallel with a bypass diode.