{"id":121,"date":"2026-03-22T19:21:08","date_gmt":"2026-03-22T19:21:08","guid":{"rendered":"https:\/\/christoph-hoerth.de\/?page_id=121"},"modified":"2026-03-22T19:21:08","modified_gmt":"2026-03-22T19:21:08","slug":"external-power-supply-for-pump-mcu","status":"publish","type":"page","link":"https:\/\/christoph-hoerth.de\/?page_id=121","title":{"rendered":"External Power Supply for Pump &amp; MCU"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The pump and microcontroller share a single 12V DC power supply rated at 5A \/ 60W. The 12V rail feeds the pump directly and also supplies the Mini360 buck converter, which steps the voltage down to 3.3V for the NodeMCU.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Sizing rationale:<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Consumer<\/th><th>Current draw<\/th><\/tr><\/thead><tbody><tr><td>Reich pump (45W at 12V)<\/td><td>~3.75A<\/td><\/tr><tr><td>Mini360 + NodeMCU + relay\/MOSFET modules<\/td><td>~0.3A<\/td><\/tr><tr><td><strong>Total<\/strong><\/td><td><strong>~4.05A<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A 5A supply provides adequate headroom above the pump&#8217;s peak draw without significant oversizing. The pump is the dominant load by a large margin \u2014 the control electronics are negligible in comparison.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Note that the two LED strips run on separate 24V supplies and are not connected to this rail.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The pump and microcontroller share a single 12V DC power supply rated at 5A \/ 60W. The 12V rail feeds the pump directly and also supplies the Mini360 buck converter, which steps the voltage down to 3.3V for the NodeMCU. Sizing rationale: Consumer Current draw Reich pump (45W at 12V) ~3.75A Mini360 + NodeMCU + &#8230; <a title=\"External Power Supply for Pump &amp; MCU\" class=\"read-more\" href=\"https:\/\/christoph-hoerth.de\/?page_id=121\" aria-label=\"Read more about External Power Supply for Pump &amp; MCU\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_kadence_starter_templates_imported_post":false,"footnotes":""},"class_list":["post-121","page","type-page","status-publish"],"_links":{"self":[{"href":"https:\/\/christoph-hoerth.de\/index.php?rest_route=\/wp\/v2\/pages\/121","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/christoph-hoerth.de\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/christoph-hoerth.de\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/christoph-hoerth.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/christoph-hoerth.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=121"}],"version-history":[{"count":1,"href":"https:\/\/christoph-hoerth.de\/index.php?rest_route=\/wp\/v2\/pages\/121\/revisions"}],"predecessor-version":[{"id":123,"href":"https:\/\/christoph-hoerth.de\/index.php?rest_route=\/wp\/v2\/pages\/121\/revisions\/123"}],"wp:attachment":[{"href":"https:\/\/christoph-hoerth.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}