{"id":40651,"date":"2020-02-02T21:02:01","date_gmt":"2020-02-02T18:02:01","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/domashnij-veb-server-na-solnechnyh-batareyah-otrabotal-15-mesyaczev-aptajm-9526"},"modified":"2020-02-02T21:02:01","modified_gmt":"2020-02-02T18:02:01","slug":"domashnij-veb-server-na-solnechnyh-batareyah-otrabotal-15-mesyaczev-aptajm-9526","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/domashnij-veb-server-na-solnechnyh-batareyah-otrabotal-15-mesyaczev-aptajm-9526","title":{"rendered":"Un server web de acas\u0103 pe energie solar\u0103 a func\u021bionat timp de 15 luni: uptime 95,26%","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/eh\/th\/2d\/ehth2dv7ykrf9lj6lrozxqzmdei.jpeg\"><img decoding=\"async\" alt=\"Un server web de acas\u0103 pe energie solar\u0103 a func\u021bionat timp de 15 luni: uptime 95,26%\" src=\"\/wp-content\/uploads\/2020\/02\/95efb97eabcf034539b88bdab2f2e721.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><br \/>\n<i>Primul prototip de server solar cu controller de \u00eenc\u0103rcare. Foto: <noindex><a rel=\"nofollow\" href=\"https:\/\/solar.lowtechmagazine.com\/power.html\">solar.lowtechmagazine.com<\/a><\/noindex><\/i><\/p>\n<p>\u00cen septembrie 2018, un entuziast de la Low-tech Magazine <noindex><a rel=\"nofollow\" href=\"https:\/\/solar.lowtechmagazine.com\/2018\/09\/how-to-build-a-lowtech-website\/\">a lansat un proiect de \u201eserver web cu tehnologie sc\u0103zut\u0103\u201d<\/a><\/noindex>. Obiectivul a fost de a reduce consumul de energie at\u00e2t de mult \u00eenc\u00e2t un server self-hosted de acas\u0103 s\u0103 poat\u0103 func\u021biona cu un singur panou solar. Aceasta nu este o sarcin\u0103 simpl\u0103, deoarece site-ul trebuie s\u0103 func\u021bioneze 24 de ore pe zi. S\u0103 vedem ce a ie\u0219it \u00een final.<\/p>\n<p>Pute\u021bi accesa serverul <noindex><a rel=\"nofollow\" href=\"https:\/\/solar.lowtechmagazine.com\/\">solar.lowtechmagazine.com<\/a><\/noindex>, verifica consumul actual de energie \u0219i nivelul de \u00eenc\u0103rcare al bateriei. Site-ul este optimizat pentru un num\u0103r minim de cereri pe pagin\u0103 \u0219i un trafic minim, astfel c\u0103 ar trebui s\u0103 reziste la un v\u00e2rf de acces\u0103ri de pe Habr. Potrivit calculului dezvoltatorului, consumul de energie pentru un vizitator unic este de 0,021 W\u22c5h.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nCu pu\u021bin \u00eenainte de zorii zilei de 31 ianuarie 2020, \u00eei mai r\u0103m\u00e2nea 42% din \u00eenc\u0103rcarea bateriei. Zorile \u00een Barcelona sunt la 8:04 ora local\u0103, iar dup\u0103 aceea ar trebui s\u0103 curg\u0103 curentul de la panoul solar.<\/p>\n<p><img decoding=\"async\" alt=\"Un server web de acas\u0103 pe energie solar\u0103 a func\u021bionat timp de 15 luni: uptime 95,26%\" src=\"\/wp-content\/uploads\/2020\/02\/3d2330b2761bc969373b9384b8181cb2.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h1>De ce?<\/h1>\n<p>\nAcum zece ani, exper\u021bii <noindex><a rel=\"nofollow\" href=\"https:\/\/www.bcg.com\/publications\/2012\/energy-environment-technology-industries-smarter-2020-role-ict-driving-sustainable-future.aspx\">previzionau<\/a><\/noindex>, c\u0103 dezvoltarea internetului contribuie la \u201edematerializarea\u201d societ\u0103\u021bii, digitalizarea generalizat\u0103 \u2014 \u0219i, ca urmare, reducerea consumului total de energie. S-au \u00een\u0219elat. De fapt, internetul \u00eensu\u0219i a solicitat <noindex><a rel=\"nofollow\" href=\"https:\/\/solar.lowtechmagazine.com\/2015\/10\/can-the-internet-run-on-renewable-energy.html\">cantit\u0103\u021bi enorme de energie<\/a><\/noindex>, iar aceste cantit\u0103\u021bi continu\u0103 s\u0103 creasc\u0103.<\/p>\n<p>Companiile IT au lansat ini\u021biative pentru a trece la surse alternative de energie, dar acest lucru este imposibil \u00een prezent. Toate centrele de date consum\u0103 de trei ori mai mult\u0103 energie dec\u00e2t genereaz\u0103 toate instala\u021biile solare \u0219i eoliene din lume. \u0218i mai r\u0103u, produc\u021bia \u0219i \u00eenlocuirea regulat\u0103 a panourilor solare \u0219i a turbinelor eoliene <noindex><a rel=\"nofollow\" href=\"https:\/\/solar.lowtechmagazine.com\/2015\/04\/how-sustainable-is-pv-solar-power.html\">de asemenea, necesit\u0103 energie<\/a><\/noindex>, a\u0219adar, renun\u021barea la combustibilii fosili (petrol, gaz, uraniu) este \u00een prezent pur \u0219i simplu imposibil\u0103. Dar aceste resurse nu vor dura mult, a\u0219a c\u0103 va trebui s\u0103 ne g\u00e2ndim la cum s\u0103 tr\u0103im din surse regenerabile. Inclusiv func\u021bionarea infrastructurii computerizate, inclusiv serverele web.<\/p>\n<p>Low-tech Magazine <noindex><a rel=\"nofollow\" href=\"https:\/\/solar.lowtechmagazine.com\/2018\/09\/how-to-build-a-lowtech-website\/\">consider\u0103 o problem\u0103<\/a><\/noindex> umflarea prea rapid\u0103 a paginilor web. \u00centre 2010 \u0219i 2018, dimensiunea medie a unei pagini a crescut <noindex><a rel=\"nofollow\" href=\"https:\/\/httparchive.org\/reports\/page-weight\">de la 0,45 MB la 1,7 MB<\/a><\/noindex>, iar pentru site-urile mobile \u2014 de la 0,15 MB la 1,6 MB, conform unei estim\u0103ri conservatoare.<\/p>\n<p>Cre\u0219terea volumului de trafic <noindex><a rel=\"nofollow\" href=\"https:\/\/www.researchgate.net\/publication\/224224694\/download\">dep\u0103\u0219e\u0219te progresul \u00een eficien\u021ba energetic\u0103<\/a><\/noindex> (energia necesar\u0103 pentru a transfera 1 megabyte de informa\u021bie), ceea ce determin\u0103 o cre\u0219tere constant\u0103 a consumului de energie al internetului. Site-urile mai grele \u0219i mai \u00eempov\u0103rate nu doar c\u0103 sporesc sarcina infrastructurii de re\u021bea, dar scurteaz\u0103 \u0219i \u201eciclul de via\u021b\u0103\u201d al calculatoarelor \u0219i smartphone-urilor, care trebuie aruncate mai des \u0219i produse noi, ceea ce de asemenea <noindex><a rel=\"nofollow\" href=\"https:\/\/solar.lowtechmagazine.com\/2009\/06\/embodied-energy-of-digital-technology.html\">un proces destul de consumator de energie<\/a><\/noindex>.<\/p>\n<p>\u0218i, desigur, cre\u0219terea sarcinii este generat\u0103 de stilul de via\u021b\u0103: oamenii petrec aproape tot timpul pe internet \u0219i se bazeaz\u0103 \u00een mare m\u0103sur\u0103 pe diferite servicii web. Societatea modern\u0103 este deja greu de imaginat f\u0103r\u0103 infrastructura IT \u00een cloud (re\u021bele sociale, mesagerie, e-mail etc.)<\/p>\n<h1>Configura\u021bia serverului \u0219i a site-ului<\/h1>\n<p>\n\u00cen <noindex><a rel=\"nofollow\" href=\"https:\/\/homebrewserver.club\/low-tech-website-howto.html#software\">aceast\u0103 articole<\/a><\/noindex> este detaliat\u0103 configura\u021bia hardware \u0219i stiva software a serverului web.<\/p>\n<p>Computer pe un singur circuit <noindex><a rel=\"nofollow\" href=\"https:\/\/www.olimex.com\/Products\/OLinuXino\/A20\/A20-OLinuXino-LIME2\/\">Olimex Olinuxino A20 Lime 2<\/a><\/noindex> selectat pentru consumul redus de energie \u0219i caracteristicile suplimentare utile, cum ar fi prezen\u021ba unui cip de management al energiei <noindex><a rel=\"nofollow\" href=\"http:\/\/dl.linux-sunxi.org\/AXP\/AXP209_Datasheet_v1.0en.pdf\">AXP209<\/a><\/noindex>. Acesta permite solicitarea de statistici cu privire la tensiunea \u0219i curentul curent de pe plac\u0103 \u0219i baterie. Cipul comut\u0103 automat alimentarea \u00eentre baterie \u0219i portul DC, unde curge curentul de la panoul solar. Astfel, este posibil\u0103 alimentarea ne\u00eentrerupt\u0103 a serverului cu suport pentru baterie.<\/p>\n<p><img decoding=\"async\" alt=\"Un server web de acas\u0103 pe energie solar\u0103 a func\u021bionat timp de 15 luni: uptime 95,26%\" src=\"\/wp-content\/uploads\/2020\/02\/1e0d37473fedf52ff3c64e20b6522789.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Olimex Olinuxino A20 Lime 2<\/i><\/p>\n<p>Ini\u021bial, ca baterie a fost ales o baterie litiu-polimer cu o capacitate de 6600 mA\u22c5h (aproximativ 24 Wh), apoi a fost instalat\u0103 o baterie plumb-acid de 84,4 Wh.<\/p>\n<p>Sistemul de operare se \u00eencarc\u0103 de pe un card SD. De\u0219i OS ocup\u0103 mai pu\u021bin de 1 GB, iar un site web static aproximativ 30 MB, nu a avut sens economic s\u0103 se cumpere un card mai mic de 16 GB Class 10.<\/p>\n<p>Serverul este conectat la re\u021bea printr-o conexiune de acas\u0103 de 100 Mbps \u00een Barcelona \u0219i un router de consum standard. I s-a rezervat o adres\u0103 IP static\u0103. Practic, oricine poate ridica un astfel de site \u00een apartamentul s\u0103u, este nevoie doar s\u0103 se schimbe u\u0219or configura\u021bia firewall-ului pentru a face forwarding porturilor la IP-ul local:<\/p>\n<pre>Port 80 la 80 pentru HTTP\nPort 443 la 443 pentru HTTPS\nPort 22 la 22 pentru SSH<\/pre>\n<p>\nSistem de operare <noindex><a rel=\"nofollow\" href=\"https:\/\/www.armbian.com\/olimex-lime-2\/\">Armbian Stretch<\/a><\/noindex> bazat pe distribu\u021bia Debian \u0219i nucleul <noindex><a rel=\"nofollow\" href=\"http:\/\/linux-sunxi.org\/Main_Page\">SUNXI<\/a><\/noindex>, care a fost dezvoltat pentru single-board-uri cu cipuri AllWinner.<\/p>\n<p><img decoding=\"async\" alt=\"Un server web de acas\u0103 pe energie solar\u0103 a func\u021bionat timp de 15 luni: uptime 95,26%\" src=\"\/wp-content\/uploads\/2020\/02\/3b4ee4dc69365fab912f98d1c8b8a0ae.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Panou solar de 50 de wa\u021bi pentru server web \u0219i un panou de 10 wa\u021bi pentru iluminarea livingului \u00een apartamentul autorului<\/i><\/p>\n<p>Site-ul static a fost generat de sistemul <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.getpelican.com\/\">Pelican<\/a><\/noindex> (generator de site-uri pe Python). Site-urile statice se \u00eencarc\u0103 mai repede \u0219i nu genereaz\u0103 o presiune pe CPU, de aceea sunt mult mai eficiente dec\u00e2t paginile generatoare dinamice, din punct de vedere al consumului de energie. Codul surs\u0103 al temei se. <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/lowtechmag\/solar\">aici<\/a><\/noindex>.<\/p>\n<p>Un aspect foarte important este comprimarea imaginilor, deoarece f\u0103r\u0103 aceast\u0103 optimizare este practic imposibil s\u0103 faci paginile web mai mici de 1 megabyte. Pentru optimizare, s-a decis s\u0103 se transforme fotografiile \u00een imagini \u00een tonuri de gri. De exemplu, iat\u0103 o fotografie cu recep\u021bionere de telefon din secolul trecut. <noindex><a rel=\"nofollow\" href=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/2\/21\/Bell_System_switchboard.jpg\">253 KB<\/a><\/noindex>.<\/p>\n<p><img decoding=\"async\" alt=\"Un server web de acas\u0103 pe energie solar\u0103 a func\u021bionat timp de 15 luni: uptime 95,26%\" src=\"\/wp-content\/uploads\/2020\/02\/680a3059f3914d937eec0a5a4592b700.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nIat\u0103 o imagine optimizat\u0103 \u00een tonuri de gri cu dimensiunea <noindex><a rel=\"nofollow\" href=\"https:\/\/homebrewserver.club\/images\/international-switchboard3.png\">36,5 KB<\/a><\/noindex> cu trei culori (negru, alb, gri). Datorit\u0103 iluziei optice, pare c\u0103 num\u0103rul culorilor este mai mare de trei.<\/p>\n<p><img decoding=\"async\" alt=\"Un server web de acas\u0103 pe energie solar\u0103 a func\u021bionat timp de 15 luni: uptime 95,26%\" src=\"\/wp-content\/uploads\/2020\/02\/01e8fa920463cffe3c0f7109cd656fa5.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAm ales fotografiile \u00een tonuri de gri nu doar pentru optimizarea dimensiunii (ceea ce este o alegere destul de discutabil\u0103), ci \u0219i pentru motive estetice. Aceast\u0103 tehnic\u0103 veche de procesare a imaginilor are anumite tr\u0103s\u0103turi stilistice, astfel \u00eenc\u00e2t site-ul a primit, \u00een vreun fel, un design unic.<\/p>\n<p>623 ilustra\u021bii de pe site-ul revistei Low-tech Magazine, dup\u0103 optimizare, au fost reduse ca dimensiune de la 194,2 MB la 21,3 MB, adic\u0103 cu 89%.<\/p>\n<p>Toate articolele vechi au fost convertite \u00een Markdown pentru a facilita scrierea de noi articole, precum \u0219i pentru a simplifica backup-ul prin. <noindex><a rel=\"nofollow\" href=\"https:\/\/git-scm.com\/doc\">git<\/a><\/noindex>. Au fost eliminate toate scripturile \u0219i trackerele de pe site, precum \u0219i logourile. Se folose\u0219te fontul implicit al browserului clientului. Ca \u201elogo\u201d, numele revistei este scris cu litere mari cu o s\u0103geat\u0103 spre st\u00e2nga: LOW\u2190TECH MAGAZINE. \u00cen total 16 bytes \u00een loc de imagine.<\/p>\n<p>\u00cen cazul unei perioade de nefunc\u021bionare, a fost organizat\u0103 posibilitatea de \u201ecitire offline\u201d: textele \u0219i imaginile sunt exportate \u00eentr-un RSS feed. Este activat\u0103 cache-izarea 100% a con\u021binutului, inclusiv HTML.<\/p>\n<p>O alt\u0103 optimizare este activarea set\u0103rii HTTP2 \u00een nginx, ceea ce reduce pu\u021bin traficul \u0219i scurteaz\u0103 timpul de \u00eenc\u0103rcare a paginilor, comparativ cu HTTP\/1.1. \u00cen tabel sunt comparate rezultatele pentru cinci pagini diferite.<\/p>\n<pre>| | FP | WE | HS | FW | CW |\n|----------|-------|-------|-------|-------|-------|\n| HTTP\/1.1 | 1.46s | 1.87s | 1.54s | 1.86s | 1.89s |\n| HTTP2 | 1.30s | 1.49s | 1.54s | 1.79s | 1.55s |\n| Imagini | 9 | 21 | 11 | 19 | 23 |\n| economii | 11% | 21% | 0% | 4% | 18% |<\/pre>\n<p>Configura\u021bia complet\u0103 nginx:<\/p>\n<pre><code class=\"nginx\">root@solarserver:\/var\/log\/nginx# cat \/etc\/nginx\/sites-enabled\/solar.lowtechmagazine.com\n\n# Mapa expir\u0103rilor\nmap $sent_http_content_type $expires {\ndefault off;\ntext\/html 7d;\ntext\/css max;\napplication\/javascript max;\n~image\/ max;\n}\n\nserver {\nlisten 80;\nserver_name solar.lowtechmagazine.com;\n\nlocation \/ {\nreturn 301 https:\/\/$server_name$request_uri;\n}\n}\n\nserver{\nlisten 443 ssl http2;\nserver_name solar.lowtechmagazine.com;\n\ncharset UTF-8; #\u00eembun\u0103t\u0103\u021be\u0219te viteza paginii trimi\u021b\u00e2nd charset-ul cu primul r\u0103spuns.\n\nlocation \/ {\nroot \/var\/www\/html\/;\nindex index.html;\nautoindex off;\n}\n\n\n#Caching (salveaz\u0103 paginile HTML timp de 7 zile, restul c\u00e2t mai mult posibil, f\u0103r\u0103 caching pe prima pagin\u0103)\nexpires $expires;\n\nlocation @index {\nadd_header Last-Modified $date_gmt;\nadd_header Cache-Control 'no-cache, no-store';\netag off;\nexpires off;\n}\n\n#error_page 404 \/404.html;\n\n# redirec\u021bioneaz\u0103 paginile de eroare ale serverului pe pagina static\u0103 \/50x.html\n#error_page 500 502 503 504 \/50x.html;\n#location = \/50x.html {\n# root \/var\/www\/;\n#}\n\n#Compresie\n\ngzip on;\ngzip_disable \"msie6\";\ngzip_vary on;\ngzip_comp_level 6;\ngzip_buffers 16 8k;\ngzip_http_version 1.1;\ngzip_types text\/plain text\/css application\/json application\/javascript text\/xml application\/xml application\/xml+rss text\/javascript;\n\n\n#Caching (salveaz\u0103 pagina HTML timp de 7 zile, restul c\u00e2t mai mult posibil)\nexpires $expires;\n\n# Jurnale\naccess_log \/var\/log\/nginx\/solar.lowtechmagazine.com_ssl.access.log;\nerror_log \/var\/log\/nginx\/solar.lowtechmagazine.com_ssl.error.log;\n\n# Set\u0103ri SSL:\nssl_certificate \/etc\/letsencrypt\/live\/solar.lowtechmagazine.com\/fullchain.pem;\nssl_certificate_key \/etc\/letsencrypt\/live\/solar.lowtechmagazine.com\/privkey.pem;\n\n# \u00cembun\u0103t\u0103\u021be\u0219te performan\u021ba HTTPS cu reluarea sesiunilor\nssl_session_cache shared:SSL:10m;\nssl_session_timeout 5m;\n\n# Activeaz\u0103 protec\u021bia serverului \u00eempotriva atacurilor BEAST\nssl_prefer_server_ciphers on;\nssl_ciphers ECDH+AESGCM:ECDH+AES256:ECDH+AES128:DH+3DES:!ADH:!AECDH:!MD5;\n\n# Dezactiveaz\u0103 SSLv3\nssl_protocols TLSv1 TLSv1.1 TLSv1.2;\n\n# Scade dimensiunea buffer-ului pentru a cre\u0219te TTFB\nssl_buffer_size 4k;\n\n# Parametrul Diffie-Hellman pentru suites de criptare DHE\n# $ sudo openssl dhparam -out \/etc\/ssl\/certs\/dhparam.pem 4096\nssl_dhparam \/etc\/ssl\/certs\/dhparam.pem;\n\n# Activeaz\u0103 HSTS (https:\/\/developer.mozilla.org\/en-US\/docs\/Security\/HTTP_Strict_Transport_Security)\nadd_header Strict-Transport-Security \"max-age=63072000; includeSubdomains\";\n\n# Activeaz\u0103 OCSP stapling (http:\/\/blog.mozilla.org\/security\/2013\/07\/29\/ocsp-stapling-in-firefox)\nssl_stapling on;\nssl_stapling_verify on;\nssl_trusted_certificate \/etc\/letsencrypt\/live\/solar.lowtechmagazine.com\/fullchain.pem;\nresolver 87.98.175.85 193.183.98.66 valid=300s;\nresolver_timeout 5s;\n}<\/code><\/pre>\n<p><\/p>\n<h1>Rezultatele celor 15 luni de activitate<\/h1>\n<p>\n\u00cen perioada 12 decembrie 2018 - 28 noiembrie 2019, serverul a \u00eenregistrat <noindex><a rel=\"nofollow\" href=\"https:\/\/www.lowtechmagazine.com\/2020\/01\/how-sustainable-is-a-solar-powered-website.html\">uptime de 95,26%<\/a><\/noindex>. Aceasta \u00eenseamn\u0103 c\u0103, din cauza vremii nefavorabile, timpul de nefunc\u021bionare \u00een acest an a fost de 399 de ore.<\/p>\n<p>Dar, dac\u0103 nu lu\u0103m \u00een considerare ultimele dou\u0103 luni, timpul de func\u021bionare f\u0103r\u0103 \u00eentreruperi a fost de 98,2%, iar timpul de nefunc\u021bionare a fost de doar 152 de ore, spun dezvoltatorii. Timpul de func\u021bionare f\u0103r\u0103 \u00eentreruperi a sc\u0103zut la 80% \u00een ultimele dou\u0103 luni, c\u00e2nd consumul de energie a crescut din cauza update-ului software-ului. \u00cen fiecare noapte, site-ul a fost oprit timp de c\u00e2teva ore.<\/p>\n<p>Conform statisticilor, pe parcursul unui an (\u00eentre 3 decembrie 2018 \u0219i 24 noiembrie 2019), consumul de energie electric\u0103 al serverului a fost de 9,53 kWh. S-au \u00eenregistrat pierderi semnificative \u00een sistemul fotovoltaic din cauza conversiei tensiunii \u0219i desc\u0103rc\u0103rii bateriei. Controlerul solar a ar\u0103tat un consum anual de 18,10 kWh, ceea ce indic\u0103 o eficien\u021b\u0103 a sistemului de aproximativ 50%.<\/p>\n<p><img decoding=\"async\" alt=\"Un server web de acas\u0103 pe energie solar\u0103 a func\u021bionat timp de 15 luni: uptime 95,26%\" src=\"\/wp-content\/uploads\/2020\/02\/740dbcd8cbfc96f7a71775e041708780.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Schema simplificat\u0103. Nu sunt prezentate convertorul de tensiune de la 12 la 5 vol\u021bi \u0219i contorul de amperi-ore pentru baterii.<\/i><\/p>\n<p>\u00cen perioada studiat\u0103, site-ul a fost vizitat de 865.000 de vizitatori unici. Incluz\u00e2nd toate pierderile de energie din instala\u021bia solar\u0103, consumul de energie pe un vizitator unic a fost de 0,021 Wh. Astfel, o kilowatt-or\u0103 de energie solar\u0103 generat\u0103 este suficient\u0103 pentru a deservi aproape 50.000 de vizitatori unici.<\/p>\n<p>Pe durata experimentului, au fost testate panouri solare de diferite dimensiuni. \u00cen tabel sunt prezentate calculele privind timpul necesar pentru a \u00eenc\u0103rca bateriile de diverse capacit\u0103\u021bi utiliz\u00e2nd panouri solare de diferite dimensiuni.<\/p>\n<p><img decoding=\"async\" alt=\"Un server web de acas\u0103 pe energie solar\u0103 a func\u021bionat timp de 15 luni: uptime 95,26%\" src=\"\/wp-content\/uploads\/2020\/02\/909a96061fc68678623fb10024f3a158.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPuterea medie consumat\u0103 de serverul web \u00een primul an, inclusiv toate pierderile de energie, a fost de 1,97 W. Calculul arat\u0103 c\u0103 pentru a men\u021bine website-ul noaptea \u00een cea mai scurt\u0103 noapte a anului (8 ore \u0219i 50 de minute, 21 iunie) sunt necesare 17,40 Wh de putere de stocare, iar \u00een cea mai lung\u0103 noapte (14 ore \u0219i 49 de minute, 21 decembrie) sunt necesare 29,19 Wh.<\/p>\n<p><img decoding=\"async\" alt=\"Un server web de acas\u0103 pe energie solar\u0103 a func\u021bionat timp de 15 luni: uptime 95,26%\" src=\"\/wp-content\/uploads\/2020\/02\/8e0af663b3d3b7d01ef3a936026fd88c.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDeoarece bateriile cu plumb-acid nu trebuie desc\u0103rcate sub jum\u0103tate din capacitate, serverul necesit\u0103 o baterie de 60 Wh pentru a supravie\u021bui celei mai lungi nop\u021bi cu iluminare optim\u0103 \u00een timpul zilei (2\u00d729,19 Wh). Marea majoritate a anului, sistemul a func\u021bionat cu o baterie de 86,4 Wh \u0219i un panou solar de 50 de wa\u021bi, ating\u00e2nd astfel uptime-ul men\u021bionat de 95-98%.<\/p>\n<h1>Uptime 100%<\/h1>\n<p>\nPentru un uptime de 100%, este necesar\u0103 cre\u0219terea capacit\u0103\u021bii bateriilor. Pentru a compensa o zi cu vreme foarte rea (f\u0103r\u0103 o generare semnificativ\u0103 de energie electric\u0103), sunt necesare 47,28 Wh (24 de ore \u00d7 1,97 wa\u021bi) de stocare.<\/p>\n<p>\u00cen perioada 1 decembrie 2019 - 12 ianuarie 2020, sistemul a fost dotat cu o baterie de 168 W, care are o capacitate practic\u0103 de stocare de 84 Wh. Aceast\u0103 capacitate este suficient\u0103 pentru a men\u021bine func\u021bionarea site-ului timp de dou\u0103 nop\u021bi \u0219i o zi. Configura\u021bia a fost testat\u0103 \u00een cea mai \u00eentunecat\u0103 perioad\u0103 a anului, dar vremea a fost relativ bun\u0103 - iar \u00een aceast\u0103 perioad\u0103, timpul de func\u021bionare f\u0103r\u0103 defec\u021biuni a fost de 100%.<\/p>\n<p>Dar pentru a garanta o disponibilitate de 100% pe parcursul mai multor ani, va trebui s\u0103 se ia \u00een considerare cel mai prost scenariu, c\u00e2nd vremea rea persist\u0103 c\u00e2teva zile. Calculul arat\u0103: pentru a men\u021bine site-ul online timp de patru zile cu o generare de energie sc\u0103zut\u0103 sau nul\u0103, va fi necesar\u0103 o baterie cu plumb-acid cu o capacitate de 440 Wh, adic\u0103 de dimensiunea unei baterii auto.<\/p>\n<p>\u00cen practic\u0103, \u00een condi\u021bii meteorologice favorabile, o baterie cu plumb-acid de 48 Wh va men\u021bine func\u021bionarea serverului timp de o noapte, din martie p\u00e2n\u0103 \u00een septembrie. O baterie de 24 Wh va men\u021bine serverul maxim 6 ore, ceea ce \u00eenseamn\u0103 c\u0103 se va opri \u00een fiecare noapte, de\u0219i la ore diferite, \u00een func\u021bie de lun\u0103.<\/p>\n<p>\u00cen general, unele site-uri nu trebuie s\u0103 func\u021bioneze pe timp de noapte, c\u00e2nd num\u0103rul vizitatorilor este minim, consider\u0103 cei de la Low-tech Magazine. De exemplu, dac\u0103 este o publica\u021bie local\u0103 de ora\u0219, la care nu acceseaz\u0103 vizitatori din alte fusuri orare, ci doar localnici.<\/p>\n<p>A\u0219adar, pentru site-uri cu trafic diferit \u0219i timp de func\u021bionare diferit sunt necesare baterii de capacitate diferit\u0103 \u0219i panouri solare de dimensiuni diverse.<\/p>\n<p><img decoding=\"async\" alt=\"Un server web de acas\u0103 pe energie solar\u0103 a func\u021bionat timp de 15 luni: uptime 95,26%\" src=\"\/wp-content\/uploads\/2020\/02\/ff28aa5311f39da9cdb2323755fe6057.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Un server web de acas\u0103 pe energie solar\u0103 a func\u021bionat timp de 15 luni: uptime 95,26%\" src=\"\/wp-content\/uploads\/2020\/02\/7a975dd06709ec5f35d821653a443a1c.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAutorul prezint\u0103 un calcul al energiei necesare pentru <i>produc\u021bia<\/i> panourilor solare (energia \u00eengropat\u0103) \u0219i c\u00e2t se ob\u021bine dac\u0103 se \u00eemparte aceast\u0103 cantitate la durata de via\u021b\u0103 estimat\u0103 de 10 ani.<\/p>\n<p><img decoding=\"async\" alt=\"Un server web de acas\u0103 pe energie solar\u0103 a func\u021bionat timp de 15 luni: uptime 95,26%\" src=\"\/wp-content\/uploads\/2020\/02\/9f4665b6a0d314048aeec9d5695c3439.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAstfel, se poate calcula echivalentul combustibililor fosili cheltui\u021bi pentru producerea \u0219i exploatarea panourilor. De la Low-tech Magazine s-a ob\u021binut c\u0103, \u00een primul an de func\u021bionare, sistemul lor (panou de 50 W, baterie de 86,4 Wh) a \u201egenerat\u201d aproximativ 9 kg de emisii sau echivalentul arderii a 3 l de benzin\u0103: aproximativ c\u00e2t consum\u0103 o ma\u0219in\u0103 personal\u0103 pe o distan\u021b\u0103 de 50 km.<\/p>\n<p><img decoding=\"async\" alt=\"Un server web de acas\u0103 pe energie solar\u0103 a func\u021bionat timp de 15 luni: uptime 95,26%\" src=\"\/wp-content\/uploads\/2020\/02\/404639422fe4ec0400d21fff74ff5977.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDac\u0103 un server nu este alimentat de panouri solare, ci de re\u021beaua electric\u0103 general\u0103, atunci emisiile echivalente sunt de aproximativ \u0219ase ori mai mici: 1,54 kg (\u00een energetic\u0103 spaniol\u0103, cotele de energie alternativ\u0103 \u0219i de centrale nucleare sunt ridicate). Totu\u0219i, aceasta nu este o compara\u021bie complet corect\u0103, scrie autorul, deoarece ia \u00een considerare energia \u00eencorporat\u0103 a infrastructurii solare, dar nu ia \u00een considerare acest indicator pentru re\u021beaua electric\u0103 general\u0103, adic\u0103 costurile de construc\u021bie \u0219i \u00eentre\u021binere.<\/p>\n<h1>\u00cembun\u0103t\u0103\u021biri suplimentare<\/h1>\n<p>\n\u00cen timp, s-au realizat o serie de optimiz\u0103ri care au redus consumul de energie al serverului. De exemplu, la un moment dat, dezvoltatorul a observat c\u0103 6,63 TB dintr-un total de 11,15 TB de trafic este generat de o implementare gre\u0219it\u0103 a unui RSS feed, care extr\u0103gea con\u021binutul la fiecare c\u00e2teva minute. Dup\u0103 corectarea acestei erori, consumul de energie al serverului (f\u0103r\u0103 a lua \u00een considerare pierderile de energie) a sc\u0103zut de la 1,14 W la aproximativ 0,95 W. C\u00e2\u0219tigul poate p\u0103rea mic, dar diferen\u021ba de 0,19 W reprezint\u0103 4,56 watt-ore pe zi, ceea ce corespunde cu peste 2,5 ore de func\u021bionare autonom\u0103 a serverului.<\/p>\n<p>\u00cen prima anul, eficien\u021ba a fost de doar 50%. Pierderile au fost observate \u00een timpul \u00eenc\u0103rc\u0103rii \u0219i desc\u0103rc\u0103rii acumulatorului (22%), precum \u0219i la conversia tensiunii de la 12 V (sistemul fotovoltaic solar) la 5 V (USB), unde pierderile pot ajunge p\u00e2n\u0103 la 28%. Dezvoltatorul recunoa\u0219te c\u0103 are un convertor de tensiune neoptimizat (un controler f\u0103r\u0103 USB integrat), a\u0219a c\u0103 acest aspect poate fi optimizat sau se poate trece la o instala\u021bie solar\u0103 de 5V.<\/p>\n<p>Pentru a cre\u0219te eficien\u021ba stoc\u0103rii energiei, acumulatorii cu plumb-acid pot fi \u00eenlocui\u021bi cu baterii litiu-ion mai scumpe, care au pierderi de \u00eenc\u0103rcare\/desc\u0103rcare mai mici (&lt;10%). Acum, designerul ia \u00een considerare o <noindex><a rel=\"nofollow\" href=\"https:\/\/solar.lowtechmagazine.com\/2018\/05\/ditch-the-batteries-off-grid-compressed-air-energy-storage.html\">sistem de stocare a energiei sub form\u0103 de aer comprimat<\/a><\/noindex> (CAES), care are o durat\u0103 de via\u021b\u0103 de zeci de ani, ceea ce \u00eenseamn\u0103 o amprenta de carbon mai mic\u0103 pentru producerea sa.<\/p>\n<p><img decoding=\"async\" alt=\"Un server web de acas\u0103 pe energie solar\u0103 a func\u021bionat timp de 15 luni: uptime 95,26%\" src=\"\/wp-content\/uploads\/2020\/02\/2bb03646e8deac750e835e302f259a5d.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Baterie compact\u0103 de energie pe baz\u0103 de aer comprimat, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.ctc-n.org\/technologies\/compressed-air-energy-storage-caes\">sursa<\/a><\/noindex><\/i><\/p>\n<p>Se ia \u00een considerare instalarea unei turbine eoliene suplimentare (aceasta poate fi <noindex><a rel=\"nofollow\" href=\"https:\/\/www.lowtechmagazine.com\/2019\/06\/small-wooden-wind-turbines.html\">fabricat\u0103 din lemn<\/a><\/noindex>) \u0219i instalarea unui tracker solar pentru a orienta panourile spre soare. Tracker-ul permite o cre\u0219tere a produc\u021biei de electricitate cu 30%.<\/p>\n<p><img decoding=\"async\" alt=\"Un server web de acas\u0103 pe energie solar\u0103 a func\u021bionat timp de 15 luni: uptime 95,26%\" src=\"\/wp-content\/uploads\/2020\/02\/8a33735a94c09da8b55664fc652af726.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nO alt\u0103 modalitate de a \u00eembun\u0103t\u0103\u021bi eficien\u021ba sistemului este scalarea acestuia. G\u0103zduind mai multe site-uri web pe server \u0219i lans\u00e2nd mai multe servere. Astfel, consumul de energie pe fiecare site va sc\u0103dea.<\/p>\n<p><img decoding=\"async\" alt=\"Un server web de acas\u0103 pe energie solar\u0103 a func\u021bionat timp de 15 luni: uptime 95,26%\" src=\"\/wp-content\/uploads\/2020\/02\/d8cb6e91b3cf2def1ef4f765da83ef23.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Compania de hosting solar. Ilustra\u021bie: Diego Marmolejo<\/i><\/p>\n<p>Dac\u0103 acoperi tot balconul apartamentului cu panouri solare \u0219i deschizi o companie de hosting web solar, costurile pe fiecare client vor fi semnificativ mai mici dec\u00e2t pentru un singur site web: economii de scar\u0103.<\/p>\n<p>\u00cen general, acest experiment demonstreaz\u0103 c\u0103, sub anumite restric\u021bii, infrastructura IT poate func\u021biona complet pe surse de energie regenerabil\u0103.<\/p>\n<p>Teoretic, un astfel de server ar putea chiar s\u0103 se descurce f\u0103r\u0103 baterii, dac\u0103 este reflectat \u00een alte p\u0103r\u021bi ale lumii. De exemplu, instal\u00e2nd oglinzi \u00een Noua Zeeland\u0103 \u0219i Chile. Acolo, panourile solare vor func\u021biona c\u00e2nd este noapte \u00een Barcelona.<br \/>\n<br \/>Sursa: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/dcmiran\/blog\/486378\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0435\u0440\u0432\u044b\u0439 \u043f\u0440\u043e\u0442\u043e\u0442\u0438\u043f \u0441\u043e\u043b\u043d\u0435\u0447\u043d\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0441 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440\u043e\u043c \u0437\u0430\u0440\u044f\u0434\u0430. \u0424\u043e\u0442\u043e: solar.lowtechmagazine.com \u0412 \u0441\u0435\u043d\u0442\u044f\u0431\u0440\u0435 2018 \u0433\u043e\u0434\u0443 \u044d\u043d\u0442\u0443\u0437\u0438\u0430\u0441\u0442 \u0438\u0437 Low-tech Magazine \u0437\u0430\u043f\u0443\u0441\u0442\u0438\u043b \u043f\u0440\u043e\u0435\u043a\u0442 \u00ab\u043d\u0438\u0437\u043a\u043e\u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0447\u043d\u043e\u0433\u043e\u00bb \u0432\u0435\u0431-\u0441\u0435\u0440\u0432\u0435\u0440\u0430. \u0417\u0430\u0434\u0430\u0447\u0430 \u0431\u044b\u043b\u0430 \u0441\u043d\u0438\u0437\u0438\u0442\u044c \u044d\u043d\u0435\u0440\u0433\u043e\u043f\u043e\u0442\u0440\u0435\u0431\u043b\u0435\u043d\u0438\u0435 \u043d\u0430\u0441\u0442\u043e\u043b\u044c\u043a\u043e, \u0447\u0442\u043e\u0431\u044b \u0434\u043e\u043c\u0430\u0448\u043d\u0435\u043c\u0443 self-hosted \u0441\u0435\u0440\u0432\u0435\u0440\u0443 \u0445\u0432\u0430\u0442\u0430\u043b\u043e \u043e\u0434\u043d\u043e\u0439 \u0441\u043e\u043b\u043d\u0435\u0447\u043d\u043e\u0439 \u043f\u0430\u043d\u0435\u043b\u0438. \u042d\u0442\u043e \u043d\u0435\u043f\u0440\u043e\u0441\u0442\u043e, \u0432\u0435\u0434\u044c \u0441\u0430\u0439\u0442 \u0434\u043e\u043b\u0436\u0435\u043d \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c 24 \u0447\u0430\u0441\u0430 \u0432 \u0441\u0443\u0442\u043a\u0438. \u041f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u043c, \u0447\u0442\u043e \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u043e\u0441\u044c \u0432 \u0438\u0442\u043e\u0433\u0435. \u041c\u043e\u0436\u0435\u0442\u0435 \u0437\u0430\u0439\u0442\u0438 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440 solar.lowtechmagazine.com, \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":40652,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-40651","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2.1 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri 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