{"id":90778,"date":"2025-03-27T12:06:09","date_gmt":"2025-03-27T02:36:09","guid":{"rendered":"https:\/\/www.solarquotes.com.au\/blog\/?p=90778"},"modified":"2025-08-21T22:45:51","modified_gmt":"2025-08-21T13:15:51","slug":"off-grid-ev-charging-heres-how-to-make-it-work","status":"publish","type":"post","link":"https:\/\/www.solarquotes.com.au\/blog\/off-grid-ev-charging-heres-how-to-make-it-work\/","title":{"rendered":"Off-Grid EV Charging: Here&#8217;s How To Make It Work"},"content":{"rendered":"<p><img decoding=\"async\" class=\"aligncenter wp-image-90784 size-full\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/victron-evse-header.jpg\" alt=\"\" width=\"1200\" height=\"630\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/victron-evse-header.jpg 1200w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/victron-evse-header-300x158.jpg 300w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/victron-evse-header-1024x538.jpg 1024w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/victron-evse-header-768x403.jpg 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<p>For those with experience living with remote area power, you&#8217;ll know every watt counts, especially in winter.<\/p>\n<p>If you want an EV, then you&#8217;ll almost certainly need more solar, and the best available management for charging the new car.<\/p>\n<p><!--more--><\/p>\n<p>For months now I&#8217;ve asked every industry veteran and solarcoaster rider I run into a key question: how are we going to charge EVs for off-grid customers?<\/p>\n<p>The best electric vehicle supply equipment (EVSE) \u2014 the charging station for your EV \u2014 available only uses available sunshine without touching your battery.<\/p>\n<p>For this type of proper smart charging, at present the only answer seems to be <a href=\"https:\/\/www.solarquotes.com.au\/ev-chargers\/reviews\/victron-review.html\">Victron<\/a> \u2014 but only if you have a Victron-based power system.<\/p>\n<p><a href=\"https:\/\/www.solarquotes.com.au\/ev-chargers\/reviews\/sma-review.html\">SMA<\/a> haven&#8217;t bothered to bring their EVSE to Australia, so I haven&#8217;t bothered trying to determine if they&#8217;re going to play well with the thousands of Sunny Island systems across the country.<\/p>\n<p>Selectronic have a solution that is quite functional if you have an <a href=\"https:\/\/www.solarquotes.com.au\/inverters\/selectronic-review.html\">SP-PRO<\/a>. It&#8217;s a clever bit of circuitry that allows control of any EVSE, even though switching might be a little imprecise compared to true dynamic control.<\/p>\n<h2>What&#8217;s In The Blue Box?<\/h2>\n<p class=\"\" data-start=\"206\" data-end=\"629\">For the first time ever, Victron is offering a choice of white or black covers! Like most, the Victron EV Charging Station can deliver up to 22kW AC in three-phase or 7.3kW in single-phase systems.<\/p>\n<p class=\"\" data-start=\"206\" data-end=\"629\">There&#8217;s a built-in LCD touchscreen so you can check or adjust things directly at the unit, which to be honest is a refreshing change in a world of screenless app-based devices. They&#8217;ll have on-grid customers demanding one for that reason alone.<\/p>\n<p>Of course setup and monitoring can be done through the VictronConnect app via Bluetooth, or using the built-in web interface over WiFi \u2014 either through a LAN or the unit\u2019s own access point.<\/p>\n<p class=\"\" data-start=\"631\" data-end=\"1079\">If you\u2019ve got a Victron Energy GX device and use VRM (Victron Remote Monitoring), the charger slots in neatly, so you can manage the whole thing remotely.<\/p>\n<p>You can also choose manual or scheduled modes to better match your driving patterns or energy use too.<\/p>\n<p class=\"\" data-start=\"1081\" data-end=\"1287\">To top it off, there\u2019s a funky <a href=\"https:\/\/www.victronenergy.com\/ev-charging\/ev-charging-station#pd-nav-image\">RGB light ring<\/a> around the charging port. It changes colour based on the charge status \u2014 disconnected, charging, fully charged \u2014 so you can tell what\u2019s going on with just a glance.<\/p>\n<div id=\"attachment_90795\" style=\"width: 910px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-90795\" class=\"size-full wp-image-90795\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/selectronic-priorities.jpg\" alt=\"A web page\" width=\"900\" height=\"331\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/selectronic-priorities.jpg 900w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/selectronic-priorities-300x110.jpg 300w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/selectronic-priorities-768x282.jpg 768w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><p id=\"caption-attachment-90795\" class=\"wp-caption-text\">With no less than 8 configurable priorities, this page is one of many used for flexible programming of an SP PRO.<\/p><\/div>\n<h2 data-start=\"1081\" data-end=\"1287\">Why Is Nobody Else Capable?<\/h2>\n<p>The Victron station can be configured to charge your EV using excess solar, making sure your car soaks up the sun instead of guzzling down your stored energy. It can do this because the entire system talks, the GX device has brains enough to know how much solar resource is available and so control what&#8217;s going on.<\/p>\n<p>The grid is sort of like an infinite battery: it&#8217;s always going to accept some charge. Any other brand of &#8220;smart&#8221; EVSE needs to be able to measure current flow into the grid and divert what it sees going past into the car.<\/p>\n<p>However, when you&#8217;re off-grid and your battery is full, there is no current to measure, so your EVSE is blind.<\/p>\n<h2>Give Your System Eyes<\/h2>\n<p>Selectronic have a <a href=\"https:\/\/selectsupport.helpdocsite.com\/tech-notes2\/tn0075-how-to-create-a-low-cost-indicative-irradiance-sensor-pyranometer-for-24v-48v-sp-pro-s?fbclid=IwY2xjawMT4XpleHRuA2FlbQIxMQABHj1aACTGWMGJ92rH2PNoItvh8OGVqNQsbEqBa5nELAlMA_tCWuFdy4NIasQu_aem_e8Z1pE9nz2VcxvfHZ2_dcA\">technical note<\/a> as part of their excellent support resources which explains how to give the SP PRO some vision, so it can see how sunny the conditions are.<\/p>\n<p class=\"\" data-start=\"176\" data-end=\"365\">Adding a pyranometer, a solar light meter, and connecting it to the analog input means you can see whether your solar system is performing as it should.<\/p>\n<p class=\"\" data-start=\"367\" data-end=\"611\">Hooked into an SP PRO battery setup, this data can be used to switch loads on or off depending on how much solar is coming in, not just how well charged the batteries are.<\/p>\n<h2 data-start=\"367\" data-end=\"611\">Lightweight Grid Hybrids Are Just That: Lightweight<\/h2>\n<p class=\"\" data-start=\"367\" data-end=\"611\">The only other way to control a heavy load such as an EV charger or pool pump would be a simple rule; say to switch on above, oh, say 95% battery state of charge. However if there&#8217;s little sunshine, you&#8217;ll just flog the battery by switching the charger on and off repeatedly.<\/p>\n<p>If your EVSE has a DRM input (<strong>D<\/strong>emand <strong>R<\/strong>esponse <strong>M<\/strong>ode causes it to derate by a set percentage) this might also be useful for an off-grid system, to trigger a medium setting instead of just on\/off, however it&#8217;s beyond the scope of this article.<\/p>\n<p>While an SP PRO has 2 analog inputs, 2 shunts, 3 digital outputs, 4 digital inputs, and 4 relays, the thing is, a garden-variety grid hybrid system simply doesn&#8217;t have enough of these for your installer to customise. Nor do they have the flexibility to program hundreds of rules and priorities for time, date, days of the week, state of charge, input quality etc etc.<\/p>\n<p>Most of all, grid hybrid inverters don&#8217;t have decent surge capacity. Sungrow might claim they can handle a generator, but their 5kW inverter can manage 6kW for 10 seconds.<\/p>\n<p>A 5kW SpPro will deliver 12kW for 30 seconds.<\/p>\n<h2 data-start=\"367\" data-end=\"611\">More Solar Will Be Crucial<\/h2>\n<p>EVs require a lot of energy for a lot of hours, so oversized solar arrays are going to be the norm. If you&#8217;re considering electric mobility, my advice would be to build a new carport and cover it with solar first.<\/p>\n<p>We&#8217;re lucky PV solar is now so cheap. I recall when most off-grid customers couldn&#8217;t afford more than 2kW of solar, they simply made the rest up with diesel, especially in winter.<\/p>\n<div id=\"attachment_90797\" style=\"width: 1034px\" class=\"wp-caption alignnone\"><img decoding=\"async\" aria-describedby=\"caption-attachment-90797\" class=\"size-full wp-image-90797\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/3cd710fbb677d55aeb1b9c4824918a211.jpg\" alt=\"\" width=\"1024\" height=\"768\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/3cd710fbb677d55aeb1b9c4824918a211.jpg 1024w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/3cd710fbb677d55aeb1b9c4824918a211-300x225.jpg 300w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/3cd710fbb677d55aeb1b9c4824918a211-768x576.jpg 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><p id=\"caption-attachment-90797\" class=\"wp-caption-text\">A carport can be a good place to whack on some extra solar panels.<\/p><\/div>\n<h2>Grid To Vehicle To Home<\/h2>\n<p>If you can drive to work and suck up a full charge of mains power before returning to your off-grid home, there&#8217;s a good chance you&#8217;ll never need a generator.<\/p>\n<p>While full bi-directional charging isn&#8217;t here yet, and will likely be a low priority for manufacturers to integrate with off-grid systems, most EVs now offer V2L capacity.<\/p>\n<p>They put out 230 volts AC power, it&#8217;s like having a camping generator built into the car. This means it&#8217;s feasible to siphon off some fuel from your EV to top up the house.<\/p>\n<p>While some customers assume their off-grid system will need double or triple the battery capacity to fill their new car, the opposite may be true. A stinking big car battery may mean your house only needs enough storage to run the fridge for a few days, because cooking tea each night is propped up by the car instead of a generator.<\/p>\n<h2>Victron&#8217;s One Big Flaw<\/h2>\n<p>The Victron EVSE is a great solution, as are many of their other products. I&#8217;ve installed lots of them, and they run rings around all the cheap garbage you find on eBay, your local camping forum or caravan group.<\/p>\n<p>However I have it on good authority that in the first release, the EVSE simply didn&#8217;t do what it said on the tin.<\/p>\n<p>The charge-on solar function did not work. It couldn&#8217;t, until the beta testing had been done, new firmware was written and updates were sent to enable the claimed features.<\/p>\n<p>While I&#8217;m glad these problems are sorted, it does expose a weakness with Victron. They have good products, great monitoring and a mind-boggling number of options, but precious little support.<\/p>\n<p>Your wholesaler is the primary contact to solve problems in the Victronisphere. Hopefully they have the time and expertise to help. Or you can try your luck with a large number of enthusiast DIY types on a <a href=\"https:\/\/community.victronenergy.com\/\">Victron-hosted worldwide technical forum<\/a>. It&#8217;s a great resource to teach yourself how these things work.<\/p>\n<p>However there is no Victron Australia phone number, so when I needed a legacy manual for a discontinued inverter and it wasn&#8217;t on the web portal, then I was shit out of luck.<\/p>\n<p>For more, check out our comprehensive guides on <a href=\"https:\/\/www.solarquotes.com.au\/ev-chargers\/\">home EV chargers<\/a> and <a href=\"https:\/\/www.solarquotes.com.au\/systems\/off-grid\/\">off-grid power systems<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>For those with experience living with remote area power, you&#8217;ll know every watt counts, especially in winter. If you want an EV, then you&#8217;ll almost certainly need more solar, and the best available management for charging the new car.<\/p>\n","protected":false},"author":28,"featured_media":90784,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[788],"tags":[],"class_list":["post-90778","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ev-chargers","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Off-Grid EV Charging: Here&#039;s How To Make It Work<\/title>\n<meta name=\"description\" content=\"Off-grid EV charging works best when using solar without draining your batteries \u2014 here&#039;s the best home charging system for the job.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.solarquotes.com.au\/blog\/off-grid-ev-charging-heres-how-to-make-it-work\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Off-Grid EV Charging: Here&#039;s How To Make It Work\" \/>\n<meta property=\"og:description\" content=\"Off-grid EV charging works best when using solar without draining your batteries \u2014 here&#039;s the best home charging system for the job.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.solarquotes.com.au\/blog\/off-grid-ev-charging-heres-how-to-make-it-work\/\" \/>\n<meta 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