Say you have an elevated cube 2’ x 2’. In our latitude, the sun rises north east and sets north west during summer. So in the early morning, you will need a wall on the north east side. That will will have to continue around the cube until it is in the north west. And the top of it will have to be covered during mid day. So you are really looking at a sphere with a doorway cut out of it on the north side if you truly want it to be totally in shade all day long in the summer.
From: Brian Webster Sent: Monday, July 12, 2021 10:27 AM To: 'AnimalFarm Microwave Users Group' Subject: Re: [AFMUG] Solar and shade for AE Fiber Cabinet Figuring out how/where you need to have a device to shade a box should be the exact same process and figuring out the best place to mount a solar panel shouldn’t it? If fact wouldn’t logic dictate that you put in a solar panel, harvest the energy AND have it be the shading method as well? Thank you, Brian Webster www.wirelessmapping.com From: AF [mailto:af-boun...@af.afmug.com] On Behalf Of Adam Moffett Sent: Monday, July 12, 2021 9:55 AM To: af@af.afmug.com Subject: Re: [AFMUG] Solar and shade for AE Fiber Cabinet Shade moves, but maybe you only concern yourself with where the sun is during the hottest 4 hours of summer days. On 7/9/2021 10:24 PM, Chuck McCown via AF wrote: That is a good point, shade moves. So the shield will have to be big and maybe have vertical features. I did shades. Something convinced me they were not worth the effort. Sent from my iPhone On Jul 9, 2021, at 8:16 PM, Bill Prince mailto:part15...@gmail.com wrote: Those are options. For sure, black will both absorb more and radiate more. The question is if you can keep it shaded. If not, then white is the choice. In a perfect world, you would paint it chameleon. White in the sun, and black in the shade/dark. -- bp part15sbs{at}gmail{dot}com On Fri, Jul 9, 2021 at 6:47 PM Chuck McCown via AF <af@af.afmug.com> wrote: Someone ought to test that. Sent from my iPhone On Jul 9, 2021, at 7:40 PM, Steve Jones <thatoneguyst...@gmail.com> wrote: I could have sworn it was afmug sourced, but somewhere along the line I picked up that a shaded enclosure will actually perform better if it is a dark color. The whites and reflective colors are better at reflecting energy off of them, but not at dissipating it, dark colors shed heat better. In a shaded environment reflectivity is moot. On Fri, Jul 9, 2021, 11:09 AM Chuck McCown via AF <af@af.afmug.com> wrote: My tests had very little live load. I think only 100 watts so that is probably the major difference. We just use a color called satellite white. I don’t think it matters much. From: castarritt Sent: Friday, July 9, 2021 9:26 AM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Solar and shade for AE Fiber Cabinet Chuck, is there a specific paint you used to shield against solar radiation? I rolled a gallon of white elastomeric roof coating from home depot onto one of our DDB boxes, and while it did drop the temp slightly, the results weren't that impressive. I think the issue with our test is we chose a site that has ~1.2kW of power draw, so most of the heat was likely from the equipment in the box rather than direct sunlight. On Fri, Jul 2, 2021 at 1:21 PM Chuck McCown via AF <af@af.afmug.com> wrote: 20+ years ago, I set up 4 identical outdoor enclosures. Temp telemetry. Some live load, don’t remember the details. They were about 24” cubes. All started out as gray. Tried sun shields, exterior insulation, vents, fans, peltier cooling modules. Silver paint, white paint. The overwhelming #1 thing that lowered temps was the satellite white paint. By a long stretch. Then filtered powered vents. Silver paint was worse than gray. I wonder if the railroad still used silver. Sun shades did little to help if the box was satellite white. Interior styrofoam insulation helped a bit, not much, but was cheap and easy to add to the white paint. Sent from my iPhone On Jul 2, 2021, at 11:39 AM, Sterling Jacobson <sterl...@avative.net> wrote: Super hot out here in Utah. My fiber cabinets running Active switches are getting harder to maintain and AC units on the side of the cabinets are starting to fail faster. I’ve had the thought of shading them with a permanent four post structure and a reflective white painted cover to shade them from the southern sun exposure. Then I thought, well, maybe it might be interesting to “shade” the cabinet with solar panels as well. Is anyone doing this? The AE cabinets all have Alpha FXM 15 or 20A units running the UPS to a string of four 12v AGM batteries. I do have limited rack space in some of these available since the batteries sit in a slide out section below. Haven’t done solar in like a decade since I had remote WISP type sites. Is this doable to offset power costs and also get the temp down for the cabinet? 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