{"id":303,"date":"2026-04-29T10:09:35","date_gmt":"2026-04-29T10:09:35","guid":{"rendered":"https:\/\/kotiakkukilpailutus.fi\/?p=303"},"modified":"2026-04-29T10:19:55","modified_gmt":"2026-04-29T10:19:55","slug":"miten-mitoittaa-aurinkosahkojarjestelma-ja-sahkovarasto-bess-kotiin","status":"publish","type":"post","link":"https:\/\/kotiakkukilpailutus.fi\/index.php\/2026\/04\/29\/miten-mitoittaa-aurinkosahkojarjestelma-ja-sahkovarasto-bess-kotiin\/","title":{"rendered":"Miten mitoittaa aurinkos\u00e4hk\u00f6j\u00e4rjestelm\u00e4 ja s\u00e4hk\u00f6varasto (BESS) kotiin"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"303\" class=\"elementor elementor-303\">\n\t\t\t\t<div class=\"elementor-element elementor-element-184dd35 e-flex e-con-boxed e-con e-parent\" data-id=\"184dd35\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f35b02f elementor-widget elementor-widget-spacer\" data-id=\"f35b02f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-501d365 elementor-widget elementor-widget-heading\" data-id=\"501d365\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Miten mitoittaa aurinkos\u00e4hk\u00f6j\u00e4rjestelm\u00e4 ja s\u00e4hk\u00f6varasto (BESS) kotiin\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ffca1a7 elementor-widget elementor-widget-heading\" data-id=\"ffca1a7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Vaihe 1: Selvit\u00e4 p\u00e4ivitt\u00e4inen energiankulutuksesi (kWh)<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2601902 elementor-widget elementor-widget-text-editor\" data-id=\"2601902\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Aurinkos\u00e4hk\u00f6j\u00e4rjestelm\u00e4n koon laskeminen alkaa todellisesta datasta, ei arvailusta.<br data-start=\"83\" data-end=\"86\" \/>Jos j\u00e4rjestelm\u00e4 mitoitetaan v\u00e4\u00e4rin, lopputuloksena voi olla joko riitt\u00e4m\u00e4t\u00f6n s\u00e4hk\u00f6nsaanti tai turhaan liian suuri investointi. Luotettavan kokonaisuuden perusta on se, ett\u00e4 tied\u00e4t tarkasti oman energiankulutuksesi.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-67ba014 elementor-widget elementor-widget-heading\" data-id=\"67ba014\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Seuraa kuukausittaista energiankulutustasi (kWh)<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d3ec30e elementor-widget elementor-widget-text-editor\" data-id=\"d3ec30e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Kotisi energiankulutus vaihtelee huomattavasti vuoden aikana esimerkiksi l\u00e4mmityksen ja viilennyksen kausivaihteluiden vuoksi. Yhden kuukauden tarkastelu voi johtaa harhaan ja v\u00e4\u00e4rist\u00e4\u00e4 koko j\u00e4rjestelm\u00e4n mitoitusta. Jotta saat realistisen l\u00e4ht\u00f6tason, kulutusta kannattaa tarkastella koko vuoden keskiarvona.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-331808b elementor-widget elementor-widget-text-editor\" data-id=\"331808b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"0\" data-end=\"73\"><strong data-start=\"0\" data-end=\"73\">Vuotuinen kokonaiskulutus (kWh) \u00f7 12 = keskim\u00e4\u00e4r\u00e4inen kuukausikulutus<\/strong><\/p><ul data-start=\"75\" data-end=\"269\" data-is-last-node=\"\" data-is-only-node=\"\"><li data-section-id=\"1st6ate\" data-start=\"75\" data-end=\"122\">Ker\u00e4\u00e4 12 per\u00e4kk\u00e4isen kuukauden s\u00e4hk\u00f6laskut.<\/li><li data-section-id=\"6dyjmv\" data-start=\"123\" data-end=\"191\">Laske yhteen koko vuoden aikana kulutetut kilowattitunnit (kWh).<\/li><li data-section-id=\"xd47pr\" data-start=\"192\" data-end=\"269\" data-is-last-node=\"\">Jaa t\u00e4m\u00e4 kokonaism\u00e4\u00e4r\u00e4 12:lla, jolloin saat luotettavan kuukausikeskiarvon.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-87bd7c1 elementor-widget elementor-widget-text-editor\" data-id=\"87bd7c1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"0\" data-end=\"50\"><strong data-start=\"0\" data-end=\"48\">Laske p\u00e4ivitt\u00e4inen energiankulutuksesi (kWh)<\/strong><\/p><p data-start=\"52\" data-end=\"263\" data-is-last-node=\"\" data-is-only-node=\"\">Aurinkos\u00e4hk\u00f6 tuotetaan ja k\u00e4ytet\u00e4\u00e4n p\u00e4ivitt\u00e4isiss\u00e4 jaksoissa. Kun muutat kuukausikeskiarvon p\u00e4ivitt\u00e4iseksi kulutukseksi, saat keskeisen luvun, jonka avulla voidaan arvioida kotisi todellinen aurinkos\u00e4hk\u00f6n tarve.<\/p><p data-start=\"0\" data-end=\"32\"><strong data-start=\"0\" data-end=\"32\">Kaava \u2013 p\u00e4ivitt\u00e4inen kulutus<\/strong><\/p><p data-start=\"34\" data-end=\"104\">Kuukausikulutus (kWh) \u00f7 30 p\u00e4iv\u00e4\u00e4 = p\u00e4ivitt\u00e4inen energiankulutus (kWh)<\/p><p data-start=\"106\" data-end=\"230\" data-is-last-node=\"\" data-is-only-node=\"\">T\u00e4m\u00e4 yksitt\u00e4inen p\u00e4ivitt\u00e4inen arvo toimii perustana kaikille my\u00f6hemmille laskelmille aurinkos\u00e4hk\u00f6j\u00e4rjestelm\u00e4n mitoituksessa.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-fb382ad e-flex e-con-boxed e-con e-parent\" data-id=\"fb382ad\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f718ec3 elementor-widget elementor-widget-heading\" data-id=\"f718ec3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Vaihe 2: Selvit\u00e4 paikalliset huipputuotantotunnit (Peak Sun Hours)<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ece155e elementor-widget elementor-widget-text-editor\" data-id=\"ece155e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Yksi yleisimmist\u00e4 virheist\u00e4 aurinkos\u00e4hk\u00f6j\u00e4rjestelm\u00e4n koon laskemisessa on se, ett\u00e4 sekoitetaan p\u00e4iv\u00e4nvalon kokonaiskesto ja niin sanotut huipputuotantotunnit (peak sun hours). Jos mitoitus perustuu siihen, kuinka kauan aurinko on taivaalla, j\u00e4rjestelm\u00e4 j\u00e4\u00e4 merkitt\u00e4v\u00e4sti alimitoitetuks<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-db7583a elementor-widget elementor-widget-heading\" data-id=\"db7583a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">\ud83d\udd06 Mit\u00e4 ovat huipputuotantotunnit?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-738cfc2 elementor-widget elementor-widget-text-editor\" data-id=\"738cfc2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Huipputuotantotunti tarkoittaa yht\u00e4 tuntia, jolloin auringon s\u00e4teilyn teho on keskim\u00e4\u00e4rin noin <strong data-start=\"429\" data-end=\"442\">1000 W\/m\u00b2<\/strong>. T\u00e4m\u00e4 on taso, jolla aurinkopaneelit tuottavat nimellistehonsa.\u00a0<\/p><h5 data-section-id=\"2e369o\" data-start=\"513\" data-end=\"556\">\ud83c\udf24\ufe0f P\u00e4iv\u00e4nvalo vs. huipputuotantotunnit<\/h5><ul data-start=\"558\" data-end=\"775\"><li data-section-id=\"15q313e\" data-start=\"558\" data-end=\"639\"><strong data-start=\"560\" data-end=\"575\">P\u00e4iv\u00e4nvalo:<\/strong> Aurinko voi olla n\u00e4kyviss\u00e4 esimerkiksi 12\u201314 tuntia p\u00e4iv\u00e4ss\u00e4.<\/li><li data-section-id=\"ptdjq3\" data-start=\"640\" data-end=\"775\"><strong data-start=\"642\" data-end=\"661\">Huipputuotanto:<\/strong> Todellista, tehokasta tuotantoa saadaan yleens\u00e4 vain noin <strong data-start=\"720\" data-end=\"743\">4\u20136 tuntia p\u00e4iv\u00e4ss\u00e4<\/strong>, kun aurinko on korkeimmillaan.<\/li><\/ul><hr data-start=\"777\" data-end=\"780\" \/><h5 data-section-id=\"vnqfa8\" data-start=\"782\" data-end=\"815\">\u26a0\ufe0f Miksi t\u00e4ll\u00e4 on merkityst\u00e4?<\/h5><p data-start=\"817\" data-end=\"941\">\ud83d\udc49 Jos k\u00e4yt\u00e4t laskennassa p\u00e4iv\u00e4nvalon tunteja huipputuotantotuntien sijaan,<br data-start=\"892\" data-end=\"895\" \/>\ud83d\udc49 <strong data-start=\"898\" data-end=\"940\">alimitoitat j\u00e4rjestelm\u00e4n merkitt\u00e4v\u00e4sti<\/strong>.<\/p><p data-start=\"943\" data-end=\"1037\" data-is-last-node=\"\" data-is-only-node=\"\">Siksi oikea mitoitus perustuu aina huipputuotantotunteihin \u2013 ei pelkk\u00e4\u00e4n auringon n\u00e4kyvyyteen.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-926d78e e-flex e-con-boxed e-con e-parent\" data-id=\"926d78e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c3ba8fe elementor-widget elementor-widget-heading\" data-id=\"c3ba8fe\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Vaihe 3: Laske aurinkos\u00e4hk\u00f6j\u00e4rjestelm\u00e4n koko<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3f36d20 elementor-widget elementor-widget-text-editor\" data-id=\"3f36d20\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"0\" data-end=\"323\">Nyt kun sinulla on tiedossa p\u00e4ivitt\u00e4inen energiankulutuksesi sek\u00e4 paikalliset aurinkotiedot, on aika yhdist\u00e4\u00e4 n\u00e4m\u00e4. K\u00e4yt\u00e4nn\u00f6ss\u00e4 laskelmiin lis\u00e4t\u00e4\u00e4n aina varmuusmarginaali, koska aurinkopaneelit eiv\u00e4t toimi 100 % hy\u00f6tysuhteella. Tehoa heikent\u00e4v\u00e4t esimerkiksi l\u00e4mp\u00f6, johdotush\u00e4vi\u00f6t sek\u00e4 tasavirran muuntaminen vaihtovirraksi.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dc720e8 elementor-widget elementor-widget-text-editor\" data-id=\"dc720e8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h5 data-section-id=\"xkb5cv\" data-start=\"330\" data-end=\"371\">\ud83d\udd27 Aurinkos\u00e4hk\u00f6j\u00e4rjestelm\u00e4n peruskaava<\/h5><p data-start=\"373\" data-end=\"458\"><strong data-start=\"373\" data-end=\"458\">J\u00e4rjestelm\u00e4n koko (kW) = (p\u00e4ivitt\u00e4inen kulutus kWh \u00f7 huipputuotantotunnit) \u00d7 1,15<\/strong><\/p><p data-start=\"460\" data-end=\"466\">Miss\u00e4:<\/p><ul data-start=\"467\" data-end=\"647\"><li data-section-id=\"1stsr8b\" data-start=\"467\" data-end=\"513\"><strong data-start=\"469\" data-end=\"483\">Daily kWh:<\/strong> kuukausikulutus \u00f7 30 p\u00e4iv\u00e4\u00e4<\/li><li data-section-id=\"103z3pb\" data-start=\"514\" data-end=\"580\"><strong data-start=\"516\" data-end=\"535\">Peak Sun Hours:<\/strong> paikallinen huipputuotanto (aurinkotunnit)<\/li><li data-section-id=\"1qds7rp\" data-start=\"581\" data-end=\"647\"><strong data-start=\"583\" data-end=\"600\">1,15 kerroin:<\/strong> noin 15 % h\u00e4vi\u00f6t (l\u00e4mp\u00f6, johdotus, invertteri)<\/li><\/ul><hr data-start=\"649\" data-end=\"652\" \/><h5 data-section-id=\"t79ib1\" data-start=\"654\" data-end=\"681\">\ud83d\udcca Esimerkki k\u00e4yt\u00e4nn\u00f6st\u00e4<\/h5><p data-start=\"683\" data-end=\"826\">Tyypillinen amerikkalainen kotitalous kuluttaa noin <strong data-start=\"735\" data-end=\"758\">900 kWh kuukaudessa<\/strong> alueella, jossa on keskim\u00e4\u00e4rin <strong data-start=\"790\" data-end=\"825\">5 huipputuotantotuntia p\u00e4iv\u00e4ss\u00e4<\/strong>.<\/p><hr data-start=\"828\" data-end=\"831\" \/><h5 data-section-id=\"w5rzmb\" data-start=\"833\" data-end=\"862\">\u26a1 Laskenta vaihe vaiheelta<\/h5><h3 data-section-id=\"v1o27a\" data-start=\"864\" data-end=\"891\">1. P\u00e4ivitt\u00e4inen kulutus<\/h3><p data-start=\"892\" data-end=\"934\">900 kWh \u00f7 30 p\u00e4iv\u00e4\u00e4<br data-start=\"911\" data-end=\"914\" \/>= <strong data-start=\"916\" data-end=\"934\">30 kWh \/ p\u00e4iv\u00e4<\/strong><\/p><hr data-start=\"936\" data-end=\"939\" \/><h5 data-section-id=\"aqlard\" data-start=\"941\" data-end=\"978\">2. Tarvittava teho ilman h\u00e4vi\u00f6it\u00e4<\/h5><p data-start=\"979\" data-end=\"1023\">30 kWh \u00f7 5 huipputuotantotuntia<br data-start=\"1010\" data-end=\"1013\" \/>= <strong data-start=\"1015\" data-end=\"1023\">6 kW<\/strong><\/p><hr data-start=\"1025\" data-end=\"1028\" \/><h5 data-section-id=\"1fd4voq\" data-start=\"1030\" data-end=\"1062\">3. Lis\u00e4t\u00e4\u00e4n h\u00e4vi\u00f6t (bufferi)<\/h5><p data-start=\"1063\" data-end=\"1089\">6 kW \u00d7 1,15<br data-start=\"1074\" data-end=\"1077\" \/>= <strong data-start=\"1079\" data-end=\"1089\">6,9 kW<\/strong><\/p><hr data-start=\"1091\" data-end=\"1094\" \/><h5 data-section-id=\"19nx0yv\" data-start=\"1096\" data-end=\"1111\">\u2705 Lopputulos<\/h5><p data-start=\"1113\" data-end=\"1189\">\ud83d\udc49 T\u00e4ss\u00e4 esimerkiss\u00e4 sopiva aurinkos\u00e4hk\u00f6j\u00e4rjestelm\u00e4n koko on noin <strong data-start=\"1179\" data-end=\"1189\">6,9 kW<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-29e29d9 e-flex e-con-boxed e-con e-parent\" data-id=\"29e29d9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0d09959 elementor-widget elementor-widget-heading\" data-id=\"0d09959\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Vaihe 4: Kuinka monta aurinkopaneelia tarvitaan<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dbecb76 elementor-widget elementor-widget-text-editor\" data-id=\"dbecb76\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Muunna nyt j\u00e4rjestelm\u00e4si koko kilowateista (kW) konkreettiseksi paneelien lukum\u00e4\u00e4r\u00e4ksi. Tarvittavien aurinkopaneelien m\u00e4\u00e4r\u00e4 saadaan jakamalla koko j\u00e4rjestelm\u00e4n teho yksitt\u00e4isen paneelin teholla.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3ac47ed elementor-widget elementor-widget-text-editor\" data-id=\"3ac47ed\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h4 data-section-id=\"196a6qr\" data-start=\"201\" data-end=\"228\">\u2460 Muunna kW watteihin<\/h4><p data-start=\"229\" data-end=\"327\">Kerro j\u00e4rjestelm\u00e4n koko luvulla 1000.<br data-start=\"266\" data-end=\"269\" \/>Esimerkiksi 6,9 kW j\u00e4rjestelm\u00e4 = <strong data-start=\"302\" data-end=\"313\">6 900 W<\/strong> kokonaisteho.<\/p><hr data-start=\"329\" data-end=\"332\" \/><h4 data-section-id=\"1ws2nqm\" data-start=\"334\" data-end=\"362\">\u2461 Jaa paneelin teholla<\/h4><p data-start=\"363\" data-end=\"500\">Jaa kokonaisteho valitsemasi paneelin teholla ja py\u00f6rist\u00e4 aina yl\u00f6sp\u00e4in.<br data-start=\"435\" data-end=\"438\" \/>Esimerkki:<br data-start=\"448\" data-end=\"451\" \/>6 900 W \u00f7 400 W paneeli = 17,25 \u2192 <strong data-start=\"485\" data-end=\"500\">18 paneelia<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-af333d5 e-flex e-con-boxed e-con e-parent\" data-id=\"af333d5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8701716 elementor-widget elementor-widget-heading\" data-id=\"8701716\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Vaihe 5: S\u00e4hk\u00f6varaston (akun) ja invertterin mitoitus<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9a31113 elementor-widget elementor-widget-text-editor\" data-id=\"9a31113\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<section class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [&amp;:has([data-writing-block])&gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-(--header-height)\" dir=\"auto\" data-turn-id=\"8d2387d2-bb7c-47ea-8ac2-1955b06a7d34\" data-testid=\"conversation-turn-83\" data-scroll-anchor=\"false\" data-turn=\"user\"><\/section><section class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [&amp;:has([data-writing-block])&gt;*]:pointer-events-auto [content-visibility:auto] supports-[content-visibility:auto]:[contain-intrinsic-size:auto_100lvh] R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-69ea9f9e-83c8-83eb-b1c5-5e48ce7b9efb-16\" data-testid=\"conversation-turn-84\" data-scroll-anchor=\"false\" data-turn=\"assistant\"><div class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"><div class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"><div class=\"flex max-w-full flex-col gap-4 grow\"><div class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+&amp;]:mt-1\" dir=\"auto\" tabindex=\"0\" data-message-author-role=\"assistant\" data-message-id=\"7747fb70-ec67-4290-b377-3d76bec6d083\" data-message-model-slug=\"gpt-5-3\" data-turn-start-message=\"true\"><div class=\"flex w-full flex-col gap-1 empty:hidden\"><div class=\"markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling\"><p data-start=\"0\" data-end=\"242\">Aurinkos\u00e4hk\u00f6j\u00e4rjestelm\u00e4 ei ole t\u00e4ydellinen ilman energian varastointia. Ilman riitt\u00e4v\u00e4n tehokasta s\u00e4hk\u00f6varastoa (BESS) kotisi on edelleen altis s\u00e4hk\u00f6katkoille, eik\u00e4 j\u00e4rjestelm\u00e4 tuota k\u00e4yt\u00e4nn\u00f6ss\u00e4 lainkaan hy\u00f6dynnett\u00e4v\u00e4\u00e4 energiaa pime\u00e4n aikaan.<\/p><\/div><\/div><\/div><\/div><\/div><\/div><\/section>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cb2a43b elementor-widget elementor-widget-heading\" data-id=\"cb2a43b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">\ud83d\udd0b Akun kapasiteetin mitoitus<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ec83146 elementor-widget elementor-widget-text-editor\" data-id=\"ec83146\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"282\" data-end=\"408\">Akun koko tulee mitoittaa sen mukaan, kuinka paljon s\u00e4hk\u00f6\u00e4 tarvitset kriittisille kuormille y\u00f6n aikana tai s\u00e4hk\u00f6katkon aikana.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-28a261d elementor-widget elementor-widget-text-editor\" data-id=\"28a261d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"1432\" data-end=\"1474\">Ensimm\u00e4inen askel on laskea energiantarve:<\/p><ul data-start=\"1476\" data-end=\"1501\"><li data-section-id=\"n7vuqo\" data-start=\"1476\" data-end=\"1501\">5 kW \u00d7 3 h = <strong data-start=\"1491\" data-end=\"1501\">15 kWh<\/strong><\/li><\/ul><p data-start=\"1503\" data-end=\"1576\">T\u00e4m\u00e4 on se m\u00e4\u00e4r\u00e4 energiaa, jonka talo haluaa k\u00e4ytt\u00e4\u00e4 akusta illan aikana.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1335db2 elementor-widget elementor-widget-text-editor\" data-id=\"1335db2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"1629\" data-end=\"1682\">Kotiakusta ei saada kaikkea energiaa k\u00e4ytt\u00f6\u00f6n, koska:<\/p><ul data-start=\"1684\" data-end=\"1756\"><li data-section-id=\"19zbr0a\" data-start=\"1684\" data-end=\"1717\">akku ei purkaudu t\u00e4ysin (DoD)<\/li><li data-section-id=\"1d36v87\" data-start=\"1718\" data-end=\"1756\">energiasta osa h\u00e4vi\u00e4\u00e4 (hy\u00f6tysuhde)<\/li><\/ul><p>15 kWh \/ 0,9 \/ 0,9 = <strong>18,5 kWh<\/strong><\/p><p>T\u00e4ss\u00e4 huomioidaan 20 % marginaali, joka ottaa huomioon purkusyvyyden, k\u00e4ynnistyskuormat ja j\u00e4rjestelm\u00e4n h\u00e4vi\u00f6t.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Miten mitoittaa aurinkos\u00e4hk\u00f6j\u00e4rjestelm\u00e4 ja s\u00e4hk\u00f6varasto (BESS) kotiin Vaihe 1: Selvit\u00e4 p\u00e4ivitt\u00e4inen energiankulutuksesi (kWh) Aurinkos\u00e4hk\u00f6j\u00e4rjestelm\u00e4n koon laskeminen alkaa todellisesta datasta, ei [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-303","post","type-post","status-publish","format-standard","hentry","category-sahkovarastot"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Miten mitoittaa aurinkos\u00e4hk\u00f6j\u00e4rjestelm\u00e4 ja s\u00e4hk\u00f6varasto (BESS) kotiin - Kotiakkukilpailutus.fi<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kotiakkukilpailutus.fi\/index.php\/2026\/04\/29\/miten-mitoittaa-aurinkosahkojarjestelma-ja-sahkovarasto-bess-kotiin\/\" \/>\n<meta property=\"og:locale\" content=\"fi_FI\" \/>\n<meta property=\"og:type\" 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