Sunrez Products Expand in Wind O&M

Bret Tollgaard, president at Sunrez, joins to discuss faster UV blade repairs, new leading edge materials, and growing OEM approvals. Reach out to [email protected] to learn more! The Uptime Wind Energy Podcast is brought to you by Weather Guard Lightning Tech, creators of the StrikeTape Ultra LPS retrofit. Subscribe to Uptime's Substack newsletter. And check out Rosemary's "Engineering with Rosie" Youtube channel. Have a question we can answer on the show? Email us! Welcome to Uptime Spotlight, shining light on wind energy's brightest innovators. This is the progress powering tomorrow. Allen Hall: Brent, welcome back to the program.  Bret Tollgaard: Appreciate you having me back on.  Allen Hall: There's been so much happening in the world of UV prepregs and UV adhesives over the past year. Particularly on LinkedIn, I've seen numerous repairs which have used your material, SunRes material, to fix some pretty decent, uh, blade problems. Are you seeing, just seeing a, a much wider adoption now that everybody has basically agreed that UV is the way to go?  Bret Tollgaard: I, I really do think that it's starting to become one of the go-to standards for a variety of repairs in the wind market. And yeah, it's great to see both our prepregs and lights being used all over LinkedIn, showing the [00:01:00] capabilities of the materials and how happy customers are to use and adopt the materials. Allen Hall: Yeah. The UV materials are, are getting adopted by OEMs. A lot of ISPs, a, a lot of operators now have it as a standard practice to use UV cured materials just because of the speed and the time that is saved. Uh, it's, it's remarkable how much time you're saving, because the, the real kicker right now if you're trying to do a repair, even in the summer months, let's just say it's warm outside and the temperatures are right and it's calm winds, you're saving multiple hours per repair. What generally... How much time are you generally saving on a kind of a, quote unquote, "standard blade repair"?  Bret Tollgaard: More and more time, actually, with each session. So we might be saving 50 upwards of 80% of the labor of a traditional epoxy repair. Um, what we've been training companies to do more and more frequently is to actually pre-consolidate the entire repair patch downtower, whether it's in the trailer or inside the tower itself. Um, and so you can pre-consolidate, get [00:02:00] all the air out in between your layers, have the primer pre-applied to the backside. That way, when you're actually uptower, it's simply peel, stick, roll, and then cure it out with our UV light. Sub 10 minutes, uh, will get you a fully cured part.  Allen Hall: Wow. That's remarkable. Yeah, when I see those LinkedIn posts from all kinds of operators all around the world using your material I also noticed that the weather conditions may not be pristine like you would have to do with epoxy. So there, there's like a band of temperatures that epoxy systems generally work in. But with the UV material, I'm noticing, I've s- I s- especially over the wintertime, I saw some cold weather repairs going on. Is there any limitation really to the UV cured patches and materials in temperatures?  Bret Tollgaard: There, there really aren't for the temperature ranges that people will actually be out and installing these. Some of my favorite photos are when it's negative five Celsius outside and everyone's got the big gloves, the big [00:03:00] scarves, the big warmers and everything, and they're applying our prepreg materials, uh, in below freezing conditions and still curing with the same 10-minute cycle time. Uh, another big advantage of our UV prepregs is everything's already pre-wet out, so you're not uptower with your fiberglass and your resin kicking off an epoxy or even some other, uh, you know, materials out there where it's really hard to impregnate and get that saturation and kick off with UV. And so our prepreg repair patches really lend themselves to efficiency in the field, uh, over a really broad variety of, uh, ambient temperatures. So some of the negative five, negative 10 C installs all the way up to the hot ones in Texas and India and Australia, where you've got these people and it's 100 Fahrenheit or, you know, 35 plus C, and you still cure with the same consistency, the same cure rate, the k- same cure speeds, um, really, really makes it a very versatile system. Allen Hall: It just gets rid of the variation and, and [00:04:00] that's one of the items when we look at repairs. So we're on the lightning side of this business where lightning damage happens, so we see a lot of repairs happen. We also see a lot of repairs that don't look great. They're, I mean, the vast majority do look great, but you get these occasional ones where they've tried to use epoxy in the wintertime and use a heat blanket. It, it's difficult to do. It, it just is because of the material, it's very difficult to do. I'm recommending more and more that they use a UV cure material if they're gonna go off and do it, particularly as they, uh, do what I would consider to be a temporary patch until they get where they can do more in-depth work when it's warmer outside. But it, it does really change the game because the ability to buy the material quickly is amazing. Uh, b- there's no hazardous me- chemi- chemicals in, uh, the Sunrise material at all, so it can be shipped anywhere, anytime, overnight, on a airplane, on a truck, doesn't matter. Does that really open up the marketplaces for the [00:05:00] Sunrise UV cure materials? Bret Tollgaard: 100%. And because of the long shelf life as well, um, we stock and store all of the common, um, materials used for wind. The prepreg, the putties, the surface primers. Fiberglass also does a great job of stocking and storing things. And yeah, because these can ship as unregulated materials, we get calls for next-day air shipping all the time, all over the world. And so whether it's out here domestically, it's going up to Canada, Europe, uh, Asia, Australia, um, it's really, really simplifies the whole process from start to finish.  Allen Hall: Are there any special tools you need to use when applying a, a UV cured prepreg patch to a blade, or is it just standard existing tools? Is there anything unique there? Bret Tollgaard: No. It's kind of as simple as it gets. There's no vacuum bag required. There's no heat blanket required. To truly install the materials, you're gonna take off the back, uh, layer of, of the film on the backside of the [00:06:00] prepreg, re-stack and consolidate your materials. Uh, you're gonna consolidate that with a basic three-inch or six-inch bubble buster hand roller. Every technician's gonna know exactly what that is. Uh, it's a simple piece of little rolling metal that, uh, simply rolls out any air between the, the repair patches. And then after that, you're gonna grab a paintbrush, and you're gonna spread some of our surface primer over the backside of the prepreg. So you got a hand roller, and you got a paintbrush That's all you're gonna need to get the material up onto the wind blade. And then of course, to cure the material, you need a UV light to do so. The sunshine, although it will cure the material, you never have consistent sun, light intensity, you're on the shady side of the blade, et cetera. And so we've developed a variety of UV curing devices to help facilitate that. So our standard in the industry right now is what we call our Gen 2 LED lamp. It's about the size of an eight and a half by 11 sheet of paper. Um, but it'll, it'll cure several square feet at a time when you're 14 to 20 inches or so away from that [00:07:00] surface. Uh, but in addition to that, we're also working on a patent pending LED array system that is gonna be a broader... Right now, it's about a half meter by one square meter surface area, and it's gonna, um, emit a very, very uniform, uh, amount of light intensity across that entire surface all at once to make it even easier for the installers so they can just strap it to the blade, cure it for five minutes, and then move it over if they have a longer, uh, you know, one to two square meter repair. Allen Hall: Wow, that's remarkable. I, I have one of your lights, and I'm always shocked at how much light intensity there is because I've used other lights and seen other lights, and then they're not nearly as bright or consistent across a, a piece of fabric, for example, where you just see uniformity.  Bret Tollgaard: That is certainly one of the challenges that we've actually encountered when people say, "Oh, well, I have a UV light. I bought it on Amazon. I bought it from eBay. I bought it from somewhere where that 200 watt listed on that is not truly 200 watts, or the light intensity, [00:08:00] uh, that they, you know, claim to have. UV cure materials need the correct wavelength. They also need the correct light intensity on that surface to guarantee your depth of cure and to make sure that you're truly bonding to the base substrate behind you. The thicker you go, the more light intensity you're going to need. So a lot of the knockoff materials really just don't do it justice, um, and which is why we've, you know, intentionally built the LED curing systems that we have to cure with our prepregs, uh, and putties and adhesives. So they are all true one, uh, one single system. Allen Hall: We've looked at different light systems here at Weather Guard, and I know we're engineer- we're an engineering group, right? So we're gonna go look to see what these different lights are, and are they really truly putting out the frequency of light which is written down on the ad. It's amazing, like, uh, the variation you get light to light. It really depends on what the source is, but, uh, to test a light, just to test a light to make sure it's putting out the right intensity at [00:09:00] th