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Professor Robert Foster

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Posted By Robert Foster 07-22-2022 09:19 PM
Found In Egroup: Everything Solar Forum
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Yes be careful with concentrating solar! We had some old motorola concentrator fresnel lens units (PV) stored on the ground in our yard at the NMSU Southwest Region Solar Experiment station. One fall morning conditions were just right that the reflected sunlight caught some dried out weeds that had grown ...
Posted By Robert Foster 06-11-2022 12:26 PM
Found In Egroup: Everything Solar Forum
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Dear ASES Friends, In conjunction with Solar2022, ASES and NMSEA have created an online fundraising Art & Getaway Auction SOLAR 2022 Art and Vacation Home Auction Paybee remove preview SOLAR 2022 Art and Vacation Home Auction Auction ends June 22, 2022 at 8:30 pm MT. All proceeds directly ...
Posted By Robert Foster 06-11-2022 11:48 AM
Found In Egroup: Everything Solar Forum
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Hi Earl, Maybe using snow guards at the edge of your roof will stop the problem and keep the snow/ice from filling up your gutter. See example at https://www.bridgersteel.com/blog/what-are-snow-guards Best of luck ------------------------------ Robert Foster Assistant Professor New Mexico State University, ...
Posted By Robert Foster 02-19-2022 01:04 AM
Found In Egroup: Everything Solar Forum
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The 42nd annual EcoCre8ive community "Gathering" will host a renewable energy online discussion Tuesday 2-22-22 from 4-8 pm MT The ASES community is invited to participate Please come share your RE thoughts and experience. See http://www.regenerative.coop4climate.org/ Wisdom from 2 Billion Years ...
Posted By Robert Foster 02-14-2022 11:57 AM
Found In Egroup: Ask a Renewable Energy Expert
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Hola Ella Check out the SUN HOA solar access guide https://www.solarunitedneighbors.org/wp-content/uploads/2019/01/SUN_HOA-Guide_FINAL.pdf Let me know if I can help with anything else Saludos ------------------------------ Robert Foster Assistant Professor New Mexico State University, College of ...
Posted By Robert Foster 01-13-2022 01:09 PM
Found In Egroup: Everything Solar Forum
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¡Bienvenida to the ASES team! We look forward to working with you. Hope to meet you F2F in Albuquerque in June for Solar 2022. ------------------------------ Robert Foster Assistant Professor New Mexico State University, College of Engineering Las Cruces NM rfoster@ases.org ---------------------- ...
Posted By Robert Foster 12-19-2021 04:37 PM
Found In Egroup: Ask a Renewable Energy Expert
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Hi Mike, This kind of discoloration was common in PV modules until the industry learned to UV stabilize encapsulants back in the early 1990s. Looks like this particular module may have missed out on the UV inhibitor application. It's the EVA encapsulant that is degrading (browning), not the actual ...
Posted By Robert Foster 12-19-2021 04:21 PM
Found In Egroup: Ask a Renewable Energy Expert
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Hola Riley, EVA is for Ethylene Vinyl Acetate, which is a traditional thermoplastic polymer encapsulant used between the PV cells and glass. It needs to have high transmissivity and durability, and thus be UV stabilized. See more at https://www.sciencedirect.com/science/article/pii/S235284782100068X ...
Posted By Robert Foster 12-15-2021 09:44 PM
Found In Egroup: Ask a Renewable Energy Expert
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Great Riley, glad to hear it all worked out. The scariest system I was involved with decommissioning back when I was a young pup was replacing the 100 kWp PV array and 600 kWh battery bank at Natural Bridges National Monument in 1991. The system was installed in 1980 and was the largest PV array in ...
Posted By Robert Foster 12-15-2021 12:49 PM
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Hi Riley, The key thing to check before working on any system is if there are any faults. Check all strings. If you find no faults, you can safely work without covering the array. But never touch any frames, metallic structures, etc. before you have first checked for ground faults, etc. (this goes ...
Posted By Robert Foster 11-30-2021 01:23 PM
Found In Egroup: Everything Solar Forum
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Hi John Sounds like your CTs are installed backwards. Double check them. ------------------------------ Robert Foster Assistant Professor New Mexico State University, College of Engineering Las Cruces NM rfoster@ases.org ------------------------------
Posted By Robert Foster 11-01-2021 08:47 PM
Found In Egroup: Everything Solar Forum
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We all know who butters Sen. Manchin's bread https://www.cnn.com/2021/10/27/politics/joe-manchin-coal-interests/index.html ------------------------------ Robert Foster Assistant Professor New Mexico State University, College of Engineering Las Cruces NM rfoster@ases.org --------------------------- ...
Posted By Robert Foster 05-20-2021 11:01 PM
Found In Egroup: Everything Solar Forum
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Hi Luther, Sounds like a great project. No history of solar cooking would be complete without including Dick Wareham from Wisconsin. He started SunStove and was quite active with solar cooking, especially in South Africa. Sadly he passed away in 2004. Good luck on your journey and please stop by the ...
Posted By Robert Foster 04-16-2021 12:42 PM
Found In Egroup: Everything Solar Forum
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Hi Lynn, There are lots of pumps available in different price ranges, some of the leading SWP providers in USA are SunPumps www.sunpumps.com Shurflo www.shurflowaterpump.com Dankoff Pumps (Solar Power & Pump Co.) www.dankoffsolarpumps.com ------------------------------ Robert Foster Assistant Professor ...
Posted By Robert Foster 03-04-2021 10:04 PM
Found In Egroup: Everything Solar Forum
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Hi Harlan, If you are going to use water, be sure to only do so when the modules are cool and not in the middle of a sunny day when they are hot, as you risk cracking the glass. Some of the big utility arrays use an air blower that goes down the rack, blowing off dust. A leaf blower works fine. Or do ...
Posted By Robert Foster 03-04-2021 10:19 AM
Found In Egroup: Everything Solar Forum
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Hi John, Module soiling generally accounts for about 1 to 5% drop in performance depending on rainfall frequency. Soiling averages about 2% per month without rainfall. In some places with lots of aerosols (e.g., Abu Dhabi) soiling can be compounded as the aerosols cling to dust particles and then glue ...
Posted By Robert Foster 02-18-2021 10:16 PM
Found In Egroup: Everything Solar Forum
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Hi Ben, sure, "Beauty is in the eye of the beholder" Some people like the way PV looks on their rooftops, but understood not everyone feels the same way and may consider itan "eyesore." There are a variety of methods to integrate a PV power system into a residence to make it less noticeable. There are ...
Posted By Robert Foster 02-18-2021 09:08 PM
Found In Egroup: Everything Solar Forum
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Hi Brad, Generally for smaller PV systems there is not a need to clean PV modules. You may do more harm than good. Usually just let Mother Nature clean off. Soiling rate averages about 2% per month without any rainfall. Spraying water on a hot array risks cracking the glass. Your spraying water early ...
Posted By Robert Foster 02-18-2021 08:47 PM
Found In Egroup: Everything Solar Forum
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Hi Luis, PV modules are durable and reliable and snow does not cause any harm to solar panels. PV actually performs better in the cold (less voltage drop) and can exceed their power rating; we design PV systems (Voc) for the coldest day of the year since that is when voltage will be highest. Solar panels ...