{"id":7623,"date":"2026-07-06T11:35:53","date_gmt":"2026-07-06T08:35:53","guid":{"rendered":"https:\/\/axinar.com\/solbox-technical-specifications-en"},"modified":"2026-10-22T08:57:07","modified_gmt":"2026-10-22T05:57:07","slug":"solbox-technical-specifications","status":"publish","type":"page","link":"https:\/\/axinar.com\/en\/solbox-technical-specifications","title":{"rendered":"SolBox, Technical Specifications"},"content":{"rendered":"<style>.axs1{--bg:#151616;--fg:#e8e8e8;--mut:#a0a0a0;--line:rgba(255,255,255,.12);--acc:#dd2b1c;--acc-t:#ff7d6e;font-family:Barlow,system-ui,sans-serif;color:var(--fg);line-height:1.6;font-size:16px;max-width:var(--ax-content-width,clamp(320px,80vw,1600px));margin:0 auto;padding:8px 20px 56px}.axs1 *{box-sizing:border-box}.axs1 .mono{font-family:\"IBM Plex Mono\",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-variant-numeric:tabular-nums}.axs1 .meta{display:flex;flex-wrap:wrap;gap:6px 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.notes{color:#444}.axs1 section{break-inside:avoid}}.axs1 .fig{margin:0;border:1px solid var(--line);border-radius:3px;overflow:hidden;background:#181919}.axs1 .fig img{display:block;width:100%;height:auto}.axs1 .fig.plate img{background:#f2f2f2;padding:10px}.axs1 .fig figcaption{padding:11px 14px 12px;font-size:13px;line-height:1.5;color:#a3a3a3;border-top:1px solid var(--line)}.axs1 .fig figcaption b{color:var(--acc-t);font-family:\"IBM Plex Mono\",ui-monospace,monospace;font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;margin-right:7px}.axs1 .sumgrid{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:0 30px;align-items:start}.axs1 .sumgrid p{margin:6px 0 0;font-size:15.5px;line-height:1.7;color:#d2d2d2}.axs1 .secfig{margin:20px 0 0;max-width:540px}.axs1 .secfig.wide{max-width:none}@media(max-width:860px){.axs1 .sumgrid{grid-template-columns:1fr;gap:20px}}@media print{.axs1 .fig{break-inside:avoid;border-color:#ccc}.axs1 .fig figcaption{color:#555;border-color:#ccc}.axs1 .fig.plate img{background:none;padding:0}}<\/style>\n<div class=\"axs1\"><!-- AX_SOLBOX_SPECS_V3 draft1 datasheet --><\/p>\n<div class=\"meta\"><span><b>SolBox<\/b> &middot; DC MPPT water-heating controller<\/span><span>AXINAR A.E. &middot; Thessaloniki, Greece<\/span><span class=\"mono\">Rev. 2026-10<\/span><\/div>\n<p class=\"lead\"><strong>Complete technical data sheet<\/strong> for SolBox, the DC MPPT controller by AXINAR that feeds the resistance of a standard electric water heater directly from photovoltaic panels. No inverter, no grid connection, no permits.<\/p>\n<div class=\"stats\">\n<div class=\"stat\"><b class=\"mono\">70<i>V<\/i><\/b><span>max DC input<\/span><\/div>\n<div class=\"stat\"><b class=\"mono\">6<i>panels<\/i><\/b><span>up to ~3,500 W<\/span><\/div>\n<div class=\"stat\"><b class=\"mono\">85<i>&deg;C<\/i><\/b><span>configurable setpoint<\/span><\/div>\n<div class=\"stat\"><b class=\"mono\">10<i>years<\/i><\/b><span>controller warranty<\/span><\/div>\n<\/div>\n<div class=\"cols\">\n<nav aria-label=\"Specification sections\">\n<p>Contents<\/p>\n<ol>\n<li><a href=\"#s1-electrical\"><em>01<\/em><span>Electrical<\/span><\/a><\/li>\n<li><a href=\"#s1-protection\"><em>02<\/em><span>Protection &amp; Safety<\/span><\/a><\/li>\n<li><a href=\"#s1-mechanical\"><em>03<\/em><span>Mechanical<\/span><\/a><\/li>\n<li><a href=\"#s1-boiler\"><em>04<\/em><span>Water Heater Compatibility<\/span><\/a><\/li>\n<li><a href=\"#s1-operational\"><em>05<\/em><span>Operational<\/span><\/a><\/li>\n<li><a href=\"#s1-connectivity\"><em>06<\/em><span>Connectivity<\/span><\/a><\/li>\n<li><a href=\"#s1-installation\"><em>07<\/em><span>Installation<\/span><\/a><\/li>\n<li><a href=\"#s1-warranty\"><em>08<\/em><span>Warranty &amp; Lifespan<\/span><\/a><\/li>\n<li><a href=\"#s1-manufacturing\"><em>09<\/em><span>Manufacturing<\/span><\/a><\/li>\n<li><a href=\"#s1-sizing\"><em>10<\/em><span>Sizing<\/span><\/a><\/li>\n<\/ol>\n<\/nav>\n<div>\n<section id=\"s1-summary\">\n<h2><em>00<\/em><span>Summary<\/span><\/h2>\n<div class=\"sumgrid\">\n<p>SolBox is a DC MPPT electronic controller that feeds power directly from photovoltaic panels into the resistance of any electric water heater (100&nbsp;L&ndash;500&nbsp;L). It runs stand-alone, no inverter, no grid connection, no installation permits. Manufactured in Thessaloniki, Greece, with a 10-year warranty.<\/p>\n<figure class=\"fig plate \"><img loading=\"lazy\" src=\"https:\/\/axinar.com\/wp-content\/uploads\/2026\/10\/solbox-installation-overview.webp\" alt=\"Cutaway of a house: three photovoltaic panels on the tiled roof, their DC cables running down the wall into the SolBox, and the SolBox output going to the electric water heater standing beside it. Nothing connects to the grid.\" width=\"1080\" height=\"1080\" loading=\"lazy\" decoding=\"async\"><figcaption><b>Fig. 1<\/b> The whole system. Panels on the roof, SolBox on the wall, the electric water heater you already own.<\/figcaption><\/figure>\n<\/div>\n<\/section>\n<section id=\"s1-electrical\">\n<h2><em>01<\/em><span>Electrical<\/span><\/h2>\n<p class=\"blurb\">What goes in, what comes out.<\/p>\n<dl>\n<dt>Input voltage (DC)<\/dt>\n<dd>up to 70 V<\/dd>\n<dt>Input from<\/dt>\n<dd>PV panels (direct DC, no inverter)<\/dd>\n<dt>Panels supported<\/dt>\n<dd>up to 6 units<\/dd>\n<dt>Panel wattage<\/dt>\n<dd>400&ndash;620 W per panel<\/dd>\n<dt>Total array power<\/dt>\n<dd>up to ~3,500 W<\/dd>\n<dt>Output<\/dt>\n<dd>DC into water heater resistance<\/dd>\n<dt>MPPT algorithm<\/dt>\n<dd>P&amp;O (Perturb &amp; Observe)<\/dd>\n<dt>MPPT tracking rate<\/dt>\n<dd>2 times per second<\/dd>\n<dt>Idle grid draw<\/dt>\n<dd>None, no grid consumption when standing by<\/dd>\n<dt>Auxiliary supply<\/dt>\n<dd>Self-powered up to 2 panels in series or 2&nbsp;+&nbsp;2; above that the included 12 V \/ 3 W supply is used<\/dd>\n<\/dl>\n<\/section>\n<section id=\"s1-protection\">\n<h2><em>02<\/em><span>Protection &amp; Safety<\/span><\/h2>\n<p class=\"blurb\">What keeps the unit and the tank out of trouble.<\/p>\n<dl>\n<dt>Surge protection<\/dt>\n<dd>Included<\/dd>\n<dt>Lightning protection<\/dt>\n<dd>Included<\/dd>\n<dt>Overheat behaviour<\/dt>\n<dd>Energy transfer stops at the setpoint, the water never boils<\/dd>\n<dt>Anti-freeze protection<\/dt>\n<dd>Auto-activates below 5&nbsp;&deg;C, cuts off at 8&nbsp;&deg;C<\/dd>\n<dt>Temperature sensing<\/dt>\n<dd>External water temperature sensor, ~1.5 m cable<\/dd>\n<dt>Fault handling<\/dt>\n<dd>Fault notifications and remote diagnostics through the app<\/dd>\n<\/dl>\n<\/section>\n<section id=\"s1-mechanical\">\n<h2><em>03<\/em><span>Mechanical<\/span><\/h2>\n<p class=\"blurb\">The box on the wall.<\/p>\n<dl>\n<dt>Dimensions (W &times; D &times; H)<\/dt>\n<dd>14.5 &times; 9.5 &times; 14.5 cm<\/dd>\n<dt>Weight<\/dt>\n<dd>2.5 kg<\/dd>\n<dt>Enclosure material<\/dt>\n<dd>Sheet metal, powder coated<\/dd>\n<dt>Mounting<\/dt>\n<dd>Wall-mounted, near the water heater<\/dd>\n<dt>Cooling<\/dt>\n<dd>Passive (no fan)<\/dd>\n<dt>Output cable<\/dt>\n<dd>Pre-fitted, ~1.5 m<\/dd>\n<\/dl>\n<figure class=\"fig plate secfig\"><img loading=\"lazy\" src=\"https:\/\/axinar.com\/wp-content\/uploads\/2026\/10\/solbox-dimensions-en.webp\" alt=\"Dimensional drawing of the SolBox V2: front view 14.5 cm wide by 14.5 cm high, side view 9.5 cm deep, weight 2.5 kg.\" width=\"1080\" height=\"1080\" loading=\"lazy\" decoding=\"async\"><figcaption><b>Fig. 2<\/b> Front and side, to scale. 14.5 &times; 9.5 &times; 14.5 cm, 2.5 kg.<\/figcaption><\/figure>\n<\/section>\n<section id=\"s1-boiler\">\n<h2><em>04<\/em><span>Water Heater Compatibility<\/span><\/h2>\n<p class=\"blurb\">It works with the tank you already own.<\/p>\n<dl>\n<dt>Boiler capacity range<\/dt>\n<dd>100 L &ndash; 500 L<\/dd>\n<dt>Recommended capacity<\/dt>\n<dd>150 L and above<\/dd>\n<dt>Resistance type<\/dt>\n<dd>Standard 220 V electric resistance (2,000&ndash;4,500 W)<\/dd>\n<dt>Equipment replacement<\/dt>\n<dd>None, uses your existing water heater<\/dd>\n<dt>Extra plumbing<\/dt>\n<dd>None, only electrical connection<\/dd>\n<dt>Backup heat source<\/dt>\n<dd>Grid, boiler or buffer tank, switched automatically<\/dd>\n<\/dl>\n<\/section>\n<section id=\"s1-operational\">\n<h2><em>05<\/em><span>Operational<\/span><\/h2>\n<p class=\"blurb\">Day-to-day behaviour.<\/p>\n<dl>\n<dt>Water temperature setpoint<\/dt>\n<dd>User-configurable, up to 85&nbsp;&deg;C<\/dd>\n<dt>Two independent setpoints<\/dt>\n<dd>Sun + backup source (e.g. grid)<\/dd>\n<dt>Scheduling<\/dt>\n<dd>4 independent 24-hour programs<\/dd>\n<dt>Holiday scheduling<\/dt>\n<dd>Annual calendar, automatic shutdown on chosen days<\/dd>\n<dt>Behaviour when no sun<\/dt>\n<dd>Water heater keeps working on grid power<\/dd>\n<dt>Cloudy-weather behaviour<\/dt>\n<dd>Produces hot water from as little as ~10 W off the panels<\/dd>\n<dt>Maintenance<\/dt>\n<dd>None<\/dd>\n<\/dl>\n<\/section>\n<section id=\"s1-connectivity\">\n<h2><em>06<\/em><span>Connectivity<\/span><\/h2>\n<p class=\"blurb\">Control from the phone.<\/p>\n<dl>\n<dt>WiFi<\/dt>\n<dd>2.4 GHz<\/dd>\n<dt>Mobile app<\/dt>\n<dd>iOS + Android<\/dd>\n<dt>Remote control<\/dt>\n<dd>Setpoints + schedule adjustments<\/dd>\n<dt>Monitoring<\/dt>\n<dd>Energy produced, water temperature, statistics<\/dd>\n<\/dl>\n<\/section>\n<section id=\"s1-installation\">\n<h2><em>07<\/em><span>Installation<\/span><\/h2>\n<p class=\"blurb\">What the job on site looks like.<\/p>\n<dl>\n<dt>Installation type<\/dt>\n<dd>Off-grid, no connection to the electrical grid<\/dd>\n<dt>Permits \/ net-metering<\/dt>\n<dd>None, and net metering is unaffected (not a grid-tied system)<\/dd>\n<dt>Installer<\/dt>\n<dd>Certified SolBox installer or licensed electrician<\/dd>\n<dt>Installation time<\/dt>\n<dd>Typically 3&ndash;5 hours, about 40% less than a conventional solar system<\/dd>\n<dt>Wiring<\/dt>\n<dd>DC from panels to SolBox, output to the resistance<\/dd>\n<dt>DC cable (not included)<\/dt>\n<dd>4 mm&sup2; or 6 mm&sup2;, depending on the run to the panels<\/dd>\n<\/dl>\n<figure class=\"fig plate secfig\"><img loading=\"lazy\" src=\"https:\/\/axinar.com\/wp-content\/uploads\/2026\/10\/solbox-box-contents.webp\" alt=\"Everything in the SolBox box laid out: the controller with its pre-fitted output cable, the external temperature sensor, a pair of MC4 connectors, four screws with wall plugs, the 12 V supply, the user manual, the mounting template and a sticker.\" width=\"1080\" height=\"1080\" loading=\"lazy\" decoding=\"async\"><figcaption><b>Fig. 3<\/b> What ships in the box. The DC cable to the panels and the water heater itself are the only things you add.<\/figcaption><\/figure>\n<\/section>\n<section id=\"s1-warranty\">\n<h2><em>08<\/em><span>Warranty &amp; Lifespan<\/span><\/h2>\n<p class=\"blurb\">How long it is covered, and by whom.<\/p>\n<dl>\n<dt>Controller warranty<\/dt>\n<dd>10 years<\/dd>\n<dt>Expected service life<\/dt>\n<dd>12+ years<\/dd>\n<dt>Panel performance warranty<\/dt>\n<dd>20&ndash;25 years (from the panel manufacturer)<\/dd>\n<dt>Board-level repair<\/dt>\n<dd>In-house, the unit is designed and built by AXINAR<\/dd>\n<dt>Service<\/dt>\n<dd>AXINAR, Thessaloniki, Greece<\/dd>\n<\/dl>\n<\/section>\n<section id=\"s1-manufacturing\">\n<h2><em>09<\/em><span>Manufacturing<\/span><\/h2>\n<p class=\"blurb\">Where it is made and how.<\/p>\n<dl>\n<dt>Country of manufacture<\/dt>\n<dd>Greece<\/dd>\n<dt>Production site<\/dt>\n<dd>Thessaloniki<\/dd>\n<dt>Manufacturer<\/dt>\n<dd>AXINAR A.E.<\/dd>\n<dt>Founded<\/dt>\n<dd>2010<\/dd>\n<dt>Manufacturer certifications<\/dt>\n<dd>ISO 9001:2015, ISO 14001:2015<\/dd>\n<dt>Enclosure process<\/dt>\n<dd>Fibre laser cutting, CNC milling, press-brake forming, TIG welding, powder coating<\/dd>\n<\/dl>\n<\/section>\n<section id=\"s1-sizing\">\n<h2><em>10<\/em><span>Sizing<\/span><\/h2>\n<p class=\"blurb\">How many panels a given tank needs, and which kit matches.<\/p>\n<table>\n<thead>\n<tr>\n<th scope=\"col\">Panel configuration<\/th>\n<th scope=\"col\">What it covers<\/th>\n<th scope=\"col\">Matching version<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><b>2 panels in series<\/b><\/td>\n<td>150 L in summer, self-powered<\/td>\n<td><a href=\"https:\/\/axinar.com\/en\/p\/axinar-solbox-light-version\">SolBox Light<\/a><\/td>\n<\/tr>\n<tr>\n<td><b>2 + 2 panels<\/b><\/td>\n<td>200 L reaching into spring and autumn, or 150 L under partial cloud<\/td>\n<td>&mdash;<\/td>\n<\/tr>\n<tr>\n<td><b>3 panels in series<\/b><\/td>\n<td>150 L and 200 L comfortably in summer<\/td>\n<td><a href=\"https:\/\/axinar.com\/en\/p\/axinar-solbox-family-version\">SolBox Family<\/a><\/td>\n<\/tr>\n<tr>\n<td><b>6 panels, 3 + 3 in series<\/b><\/td>\n<td>Maximum output of the unit, 300 L under partial cloud, longest season<\/td>\n<td><a href=\"https:\/\/axinar.com\/en\/p\/axinar-solbox-pro-version\">SolBox Pro<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure class=\"fig plate secfig wide\"><img loading=\"lazy\" src=\"https:\/\/axinar.com\/wp-content\/uploads\/2026\/10\/solbox-versions-light-family-pro.webp\" alt=\"The three SolBox versions side by side: Light with 2 solar panels, Family with 3, Pro with 6, plus custom builds from 1 to 6 panels.\" width=\"1600\" height=\"600\" loading=\"lazy\" decoding=\"async\"><figcaption><b>Fig. 4<\/b> Light, Family, Pro. Two, three or six panels, or any count from one to six on request.<\/figcaption><\/figure>\n<\/section>\n<div class=\"notes\">\n<ul>\n<li>Panel brand and type are unrestricted. Between 2 and 6 panels depending on tank size and how much of the year you want covered.<\/li>\n<li>Sizing above is indicative. The <a href=\"https:\/\/axinar.com\/en\/solbox-configurator\" style=\"color:#fff\">SolBox Configurator<\/a> works it out from your tank, household size and location.<\/li>\n<li>Terms used on this page are defined in the <a href=\"https:\/\/axinar.com\/en\/glossary\" style=\"color:#fff\">AXINAR glossary<\/a>. Further questions are answered in the <a href=\"https:\/\/axinar.com\/en\/faq-solbox\" style=\"color:#fff\">SolBox FAQ<\/a>.<\/li>\n<li>Document Rev. 2026-10. Specifications are subject to change without notice.<\/li>\n<\/ul>\n<\/div>\n<div class=\"act\"><a class=\"btn\" href=\"https:\/\/axinar.com\/en\/solbox-configurator\">Size my system<\/a><a class=\"btn alt\" href=\"https:\/\/axinar.com\/en\/c\/solbox-en\">SolBox versions<\/a><a class=\"btn alt\" href=\"https:\/\/axinar.com\/en\/faq-solbox\">FAQ<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>SolBox &middot; DC MPPT water-heating controllerAXINAR A.E. &middot; Thessaloniki, GreeceRev. 2026-10 Complete technical data sheet for SolBox, the DC MPPT [&hellip;]<\/p>\n","protected":false},"author":16,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_eb_attr":"","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":"","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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"rank_math_title":"SolBox \u2014 Technical Specifications | AXINAR","rank_math_description":"Complete SolBox tech sheet: DC MPPT, up to 70V, 6 panels, 100\u2013500L boilers, WiFi, 10-year warranty. Made in Greece by AXINAR.","footnotes":""},"class_list":["post-7623","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/axinar.com\/en\/wp-json\/wp\/v2\/pages\/7623","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/axinar.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/axinar.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/axinar.com\/en\/wp-json\/wp\/v2\/users\/16"}],"replies":[{"embeddable":true,"href":"https:\/\/axinar.com\/en\/wp-json\/wp\/v2\/comments?post=7623"}],"version-history":[{"count":2,"href":"https:\/\/axinar.com\/en\/wp-json\/wp\/v2\/pages\/7623\/revisions"}],"predecessor-version":[{"id":9432,"href":"https:\/\/axinar.com\/en\/wp-json\/wp\/v2\/pages\/7623\/revisions\/9432"}],"wp:attachment":[{"href":"https:\/\/axinar.com\/en\/wp-json\/wp\/v2\/media?parent=7623"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}