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? >> >> >> >> Or is it just a huge time suck and money pit for no real return? >> -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> >> -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > ------------------------------ > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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