System and method for attaching a solar module to a substrate
View Patent ↗A spacer used to secure a solar module to a substrate having surface irregularities or unevenness includes a spacer layer located between two adhesive layers. The spacer has a thickness greater than any anticipated irregularities or unevenness on the surface of the substrate. The spacer is comprised of materials that provide sufficient strength and weatherability.
1. An assembly for securing a solar module to a roofing substrate, the roofing substrate having at least one pair of parallel, spaced apart ridges, the assembly comprising:
a spacer having a top surface and a bottom surface, wherein the spacer has a first dimension equal to a distance between one of the pair of ridges and another of the pair of ridges and the spacer has a second dimension greater than a distance between a bottom of the at least one pair of ridges and a top of the at least one pair of ridges;
a first adhesive layer having a first surface and a second surface, wherein the first surface is in contact with at least a portion of the top surface of the spacer and the second surface is in contact with at least a portion of the solar module;
a second adhesive layer having a first surface and a second surface, wherein the first surface is in contact with at least a portion of the bottom surface of the spacer and the second surface is in contact with at least a portion of the roofing substrate; and
wherein the assembly is disposed between the at least one pair of ridges to adhere the solar module to the roofing substrate; and wherein the first and second adhesive layers comprise:
an uncured rubbery polymer blend present in an amount from about 10% to about 60% by weight;
at least one of a compatible tackifier present in an amount from about 5% to about 25% by weight or a curing agent blend present in an amount from about 1% to about 5% by weight, the compatible tackifier comprising a phenolic tackifier resin, the curing agent blend comprising at least one of a cure accelerator, a sulfur activator, and a curing vulcanizing agent; and
a polybutene homopolymer present in an amount from about 20% to about 60% by weight.
2. The assembly of claim 1 wherein the first dimension is measured perpendicularly between a first side surface of the spacer and a second side surface of the spacer.
3. The assembly of claim 1 wherein the second dimension is measured perpendicularly between the top surface and the bottom surface of the spacer.
4. The assembly of claim 1 wherein the first adhesive layer fully covers the top surface of the spacer and the second adhesive layer fully covers the bottom surface of the spacer.
5. The assembly of claim 1 wherein the second adhesive layer is adhered to the substrate and the first adhesive layer is adhered to the solar module.
6. The assembly of claim 1 wherein the spacer is comprised of at least one of ethylene propylene diene terpolymer, polypropylene, or a polyvinyl chloride.
7. The assembly of claim 1 wherein the first and second adhesive layers have a composition that comprises an uncured rubbery polymer blend, at least one tackifier or a curing agent blend, and a polybutene homopolymer.
8. An assembly for securing a solar module to a roofing substrate, the roofing substrate having at least one pair of parallel, spaced apart ridges, the assembly comprising:
a spacer having a top surface and a bottom surface, wherein the spacer has a first dimension less than a distance between one of the pair of ridges and another of the pair of ridges and the spacer has a second dimension greater than a distance between a bottom of the at least one pair of ridges and a top of the at least one pair of ridges;
a first adhesive layer having a first surface and a second surface, wherein the first surface is in contact with at least a portion of the top surface of the spacer and the second surface is in contact with at least a portion of the solar module;
a second adhesive layer having a first surface and a second surface, wherein the first surface is in contact with at least a portion of the bottom surface of the spacer and the second surface is in contact with at least a portion of the roofing substrate,
wherein the first and second adhesive layers each comprise:
an uncured rubbery polymer blend present in an amount from about 10% to about 60% by weight;
at least one of a compatible tackifier present in an amount from about 5% to about 25% by weight or a curing agent blend present in an amount from about 1% to about 5% by weight, the compatible tackifier comprising a phenolic tackifier resin, the curing agent blend comprising at least one of a cure accelerator, a sulfur activator, and a curing vulcanizing agent; and
a polybutene homopolymer present in an amount from about 20% to about 60% by weight, and
wherein the assembly is disposed between the at least one pair of ridges to adhere the solar module to the roofing substrate.
9. The assembly of claim 8 wherein the first dimension is measured perpendicularly between a first side surface of the spacer and a second side surface of the spacer.
10. The assembly of claim 8 wherein the second dimension is measured perpendicularly between the top surface and the bottom surface of the spacer.
11. The assembly of claim 8 wherein the first adhesive layer fully covers the top surface of the spacer and the second adhesive layer fully covers the bottom surface of the spacer.
12. The assembly of claim 8 wherein the second adhesive layer is adhered to the substrate and the first adhesive layer is adhered to the solar module.
13. The assembly of claim 8 wherein the spacer is comprised of at least one of ethylene propylene diene terpolymer, polypropylene, or a polyvinyl chloride.