/challenges-projects/design-challenges/experimenting-with-extreme-environments/b/blog/posts/exploring-hidden-extremes-of-sheltered-environment---extra-blog-4--greenhouse-in-the-boxIntro Let&#39;s start with the riddle: what is it? A box with transparent top, placed at the backyard in the sunny place? This? or maybe this? Let&#39;s check what direct Sun radiation does to our (set of) waterproof enclosure(s). Black box or white box? Hen-USTelligent Community 12https://community.element14.com/challenges-projects/design-challenges/experimenting-with-extreme-environments/b/blog/posts/exploring-hidden-extremes-of-sheltered-environment---extra-blog-4--greenhouse-in-the-boxMon, 27 May 2024 10:46:34 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:f03d6b60-2435-459c-8c55-1f3ea62522e9JWx1<p>ok - it seems that connector de-cappig is repeatable. I have suffered premature battery discharge during the current test, so I have decided to repeat solar radiation test and it happens every sunny day even when there is nobody home (so third-party interference can be ruled out)</p><img src="https://community.element14.com/aggbug?PostID=27967&AppID=437&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/challenges-projects/design-challenges/experimenting-with-extreme-environments/b/blog/posts/exploring-hidden-extremes-of-sheltered-environment---extra-blog-4--greenhouse-in-the-boxWed, 22 May 2024 10:49:31 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:f03d6b60-2435-459c-8c55-1f3ea62522e9javagoza1<p>That&#39;s not intuitive to me or it doesn&#39;t make sense. With heat, plastic is supposed to expand by thermal expansion more than metal, so the plastic cap should tighten the connector more. Something tells me that the cap was not fully inserted and it was thermal expansion that finally ejected the cap.</p><img src="https://community.element14.com/aggbug?PostID=27967&AppID=437&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/challenges-projects/design-challenges/experimenting-with-extreme-environments/b/blog/posts/exploring-hidden-extremes-of-sheltered-environment---extra-blog-4--greenhouse-in-the-boxTue, 21 May 2024 19:50:14 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:f03d6b60-2435-459c-8c55-1f3ea62522e9DAB1<p>Nice test.</p> <p>I suspect that there is a minor flaw in the cap design which enabled the internal pressure to push the cap off.</p> <p>It might be a safety feature.</p> <p>Either way, the port is probably the weakest part of the enclosure.</p><img src="https://community.element14.com/aggbug?PostID=27967&AppID=437&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/challenges-projects/design-challenges/experimenting-with-extreme-environments/b/blog/posts/exploring-hidden-extremes-of-sheltered-environment---extra-blog-4--greenhouse-in-the-boxTue, 21 May 2024 16:54:07 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:f03d6b60-2435-459c-8c55-1f3ea62522e9dougw2<p>Interesting - I have never seen internal pressure blow off a cap ...</p> <p>It dose bring up the issue of pressure changes due to temperature changes in a sealed box.</p><img src="https://community.element14.com/aggbug?PostID=27967&AppID=437&AppType=Weblog&ContentType=0" width="1" height="1">