{"id":14008,"date":"2017-08-15T08:06:33","date_gmt":"2017-08-14T21:36:33","guid":{"rendered":"https:\/\/www.solarquotes.com.au\/blog\/?p=14008"},"modified":"2024-10-02T12:55:41","modified_gmt":"2024-10-02T03:25:41","slug":"using-fronius-inverter-smart-meter-relay-make-solar-electric-hot-water","status":"publish","type":"post","link":"https:\/\/www.solarquotes.com.au\/blog\/using-fronius-inverter-smart-meter-relay-make-solar-electric-hot-water\/","title":{"rendered":"How To Use a Fronius Smart Meter To Solar Power Your Hot Water"},"content":{"rendered":"<div id=\"attachment_14139\" style=\"width: 788px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-14139\" class=\"size-full wp-image-14139\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/2017-08-15_15-38-32.png\" alt=\"fronius hot water diversion\" width=\"778\" height=\"517\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/2017-08-15_15-38-32.png 778w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/2017-08-15_15-38-32-300x199.png 300w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/2017-08-15_15-38-32-768x510.png 768w\" sizes=\"(max-width: 778px) 100vw, 778px\" \/><p id=\"caption-attachment-14139\" class=\"wp-caption-text\">Note to installers: Don&#8217;t wire directly in to bathtub or the duck will die.<\/p><\/div>\n<p>Over the past week or so I&#8217;ve been politely prodded\u00a0 by a plethora of people pushing me to provide information pertaining to solar hot water diverters.<\/p>\n<p>A &#8216;hot water diverter&#8217; is a box of power electronics that that sucks up your homes&#8217; surplus solar electricity and diverts it to an electric hot water system instead of exporting it to the grid where it would earn a feed-in-tariff. \u00a0If the whole system is well designed and installed it will \u00a0greatly reduce or even eliminate using grid electricity for water heating.<!--more--><\/p>\n<p>Feed-in tariffs have recently risen &#8212; well, not for Westies<sup class='endnote'><a href='https:\/\/www.solarquotes.com.au\/blog\/using-fronius-inverter-smart-meter-relay-make-solar-electric-hot-water\/#en-14008-1' id='enref-14008-1' onclick='return hhEndnotes_show(14008)'>1<\/a><\/sup>, but for the rest of us &#8212; so really, interest in diverters should have remained restrained, because the more you can get paid for exporting your solar, the lower the rate of return will be on investing in diverter hardware.<\/p>\n<p>But, as fate would have it, a fairly sensational <a href=\"http:\/\/www.abc.net.au\/news\/2017-08-06\/big-data-devices-get-more-free-energy-from-sun\/8774584\" target=\"_blank\" rel=\"noopener noreferrer\">ABC News story<\/a> has stoked curiosities across the country and caused countless cadres of curious citizens to kindly clamor for me come up with more information.<\/p>\n<p>I fully intend to write about hot water diverters in depth &#8212; just as soon as I am done convincing someone else to do most of the actual work for me.\u00a0 But before I get around to doing that, I will tell you what I know about another method for increasing the amount of solar electricity used to heat water that can be done by people who very wisely own, or who are going to own, a <a href=\"https:\/\/www.solarquotes.com.au\/inverters\/fronius-review.html\">Fronius<\/a> inverter.<\/p>\n<p>By using a <a href=\"https:\/\/www.fronius.com\/en-au\/australia\/solar-energy\/installers-partners\/technical-data\/all-products\/system-monitoring\/hardware\/fronius-smart-meter\/fronius-smart-meter-50ka-3\" target=\"_blank\" rel=\"noopener noreferrer\">Fronius smart meter<\/a> and connecting a\u00a0<a href=\"http:\/\/Fronius Energy Management Relay\" target=\"_blank\" rel=\"noopener noreferrer\">Fronius Energy Management <\/a>Relay<sup class='endnote'><a href='https:\/\/www.solarquotes.com.au\/blog\/using-fronius-inverter-smart-meter-relay-make-solar-electric-hot-water\/#en-14008-2' id='enref-14008-2' onclick='return hhEndnotes_show(14008)'>2<\/a><\/sup> \u00a0to their electric hot water system, Fronius inverter owners can use their Fronius<sup class='endnote'><a href='https:\/\/www.solarquotes.com.au\/blog\/using-fronius-inverter-smart-meter-relay-make-solar-electric-hot-water\/#en-14008-3' id='enref-14008-3' onclick='return hhEndnotes_show(14008)'>3<\/a><\/sup> datamanager, which came with their inverter, to turn their hot water systems on when there is a surplus of solar energy that would otherwise be sent into the grid, and turn the hot water system off when solar output falls.<\/p>\n<p>Here&#8217;s a schematic from Fronius for the technically minded:<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-42700\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/wiring-diag-f-relay.jpg\" alt=\"\" width=\"945\" height=\"592\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/wiring-diag-f-relay.jpg 945w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/wiring-diag-f-relay-300x188.jpg 300w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/wiring-diag-f-relay-768x481.jpg 768w\" sizes=\"(max-width: 945px) 100vw, 945px\" \/><\/p>\n<p><em><strong>Update 21st August:\u00a0 <\/strong>I have learned that while most Fronius inverters come with datamanagers installed, there are versions called &#8220;light&#8221; that do not.\u00a0 So if you are buying a Fronius inverter and want to use their relay and smart meter, check that you are not buying a light version.\u00a0 <\/em><\/p>\n<div id=\"attachment_14133\" style=\"width: 874px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-14133\" class=\" wp-image-14133\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/M-72018.png.jpeg\" alt=\"fronts smart meter\" width=\"864\" height=\"486\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/M-72018.png.jpeg 1540w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/M-72018.png-300x169.jpeg 300w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/M-72018.png-768x432.jpeg 768w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/M-72018.png-1024x576.jpeg 1024w\" sizes=\"(max-width: 864px) 100vw, 864px\" \/><p id=\"caption-attachment-14133\" class=\"wp-caption-text\">A Fronius Smart Meter (3 phase model shown)<\/p><\/div>\n<p>It is also possible to use just the relay without the smart meter.\u00a0 It will still work, but won&#8217;t be nearly as smart.<\/p>\n<p>The Fronius relay will either switch your hot water element 100% on, or 100% off<sup class='endnote'><a href='https:\/\/www.solarquotes.com.au\/blog\/using-fronius-inverter-smart-meter-relay-make-solar-electric-hot-water\/#en-14008-4' id='enref-14008-4' onclick='return hhEndnotes_show(14008)'>4<\/a><\/sup>. It isn&#8217;t able to send small amounts of surplus solar power to the hot water system as a diverter can, so it is not as effective at using surplus solar electricity, but may be considerably cheaper.\u00a0 Fronius makes a hot water diverter, called a Fronius <a href=\"https:\/\/www.fronius.com\/en-au\/australia\/solar-energy\/installers-partners\/technical-data\/all-products\/solutions\/fronius-solution-for-heat-generation\/fronius-ohmpilot\/fronius-ohmpilot\" target=\"_blank\" rel=\"noopener noreferrer\">Ohmpilot<\/a>, that is not available at the moment in Australia.\u00a0 They say its installed cost in Europe, at the current exchange rate, will be from $1,600 to $1,940.\u00a0 In comparison, they say the European cost of installing their relay will only be from $300 to $520.<\/p>\n<div id=\"attachment_14134\" style=\"width: 934px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-14134\" class=\" wp-image-14134\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/M-73119.png.jpeg\" alt=\"Fronius Ohmpilot\" width=\"924\" height=\"520\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/M-73119.png.jpeg 1540w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/M-73119.png-300x169.jpeg 300w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/M-73119.png-768x432.jpeg 768w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/M-73119.png-1024x576.jpeg 1024w\" sizes=\"(max-width: 924px) 100vw, 924px\" \/><p id=\"caption-attachment-14134\" class=\"wp-caption-text\">The not-available-in-Australia-but-totally-available-in-Austria Fronius Ohmpilot<\/p><\/div>\n<p>The good news is, as part of a Fronius inverter installation, it is possible to have a relay installed in Australia for $220.\u00a0 At the same time, a <a href=\"https:\/\/www.solarquotes.com.au\/glossary.html#singlephasepower\">single phase<\/a> Fronius smart meter can be installed for $340 or the more expensive <a href=\"https:\/\/www.solarquotes.com.au\/glossary.html#threephasepower\">3 phase<\/a> smart meter for $680.\u00a0 So for a home with single-phase power, having a Fronius relay and smart meter installed can add under $600 to the cost of a Fronius inverter installation.<\/p>\n<p><em><strong>Update 21st August:\u00a0 <\/strong>There are versions of Fronius inverters called &#8220;light&#8221; that don&#8217;t come with datamanagers.\u00a0 If you are buying one of these and need to install the datamanager separately it may add approximately $380 to the installation.<br \/>\n<\/em><\/p>\n<h2>What The Hell Is Fronius?<\/h2>\n<div id=\"attachment_14044\" style=\"width: 280px\" class=\"wp-caption alignright\"><img decoding=\"async\" aria-describedby=\"caption-attachment-14044\" class=\"wp-image-14044 size-full\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/family.jpg\" alt=\"Fake Austrian Family\" width=\"270\" height=\"205\" \/><p id=\"caption-attachment-14044\" class=\"wp-caption-text\">A fake Austrian family in fake Austria, with a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Neuschwanstein_Castle\" target=\"_blank\" rel=\"noopener noreferrer\">fake Austrian castle<\/a> in the background.<\/p><\/div>\n<p>Fronius is a family-owned Austrian company, founded in 1945 in an Austrian army hut by <a href=\"http:\/\/adventuretime.wikia.com\/wiki\/Gunter\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">Gunter<\/a> and Friedl Fronius.\u00a0 The company also makes welding gear, but Down Under they are most famous for their high-quality solar inverters.<\/p>\n<p>Fronius inverters come with a <a href=\"https:\/\/www3.fronius.com\/cps\/rde\/xchg\/fronius_australia\/hs.xsl\/25_9145.htm#.WZH3vNHhVPY\" target=\"_blank\" rel=\"noopener noreferrer\">10 year warranty<\/a>, which is better than the 5 years most have, but the warranty only covers the cost of installing a replacement for the first 5 years.\u00a0 For the second 5 year period, they will provide a replacement inverter, but won&#8217;t pay for installation.<\/p>\n<h2>How Does The Fronius Smart Meter And Relay Work?<\/h2>\n<p>When the Fronius smart meter is installed and a Fronius relay is wired up to your electric hot water system, you are ready to rock and roll!\u00a0 Or rather, monitor and control.\u00a0 I guess, when you think about it, that&#8217;s really the opposite of rock and roll&#8230; but I&#8217;m sure it&#8217;s still lots of fun.<\/p>\n<p>The Fronius datamanager, which is the monitoring software all their inverters come with, can now be used to set the hot water system to only turn on only when there is enough surplus solar electricity to run it.\u00a0 This makes it possible to never use grid electricity to heat your water again.<\/p>\n<p>But unless you have a giant beast of a solar system, you may end up taking quite a few cold showers in winter when hot water use is at its highest and solar output is at its lowest.\u00a0 Fortunately, if, <a href=\"http:\/\/www.telegraph.co.uk\/news\/2017\/08\/13\/jeremy-clarkson-told-stay-hospital-die\/\" target=\"_blank\" rel=\"noopener noreferrer\">like Jeremy Clarkson<\/a>, \u00a0you are not a fan of pneumonia, you can avoid this by programing the datamanager to turn on the hot water system for a period each day even if there isn&#8217;t enough surplus solar electricity to run it, which is very likely on cold miserable days with no sunshine.\u00a0 So even with this system installed most people will still use at least some grid electricity for hot water.<\/p>\n<div id=\"attachment_14087\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-14087\" class=\"size-full wp-image-14087\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/cyborgconsumers.jpg\" alt=\"Austrian cyborg\" width=\"600\" height=\"83\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/cyborgconsumers.jpg 600w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/cyborgconsumers-300x42.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><p id=\"caption-attachment-14087\" class=\"wp-caption-text\">It switches individual consumers on or off?\u00a0 Sounds like Austrian cyborg technology is more advanced than I thought.<\/p><\/div>\n<h2>The Relay Can Be Used Alone<\/h2>\n<p>I spoke to <a href=\"http:\/\/mcelectrical.com.au\/\" target=\"_blank\" rel=\"noopener noreferrer\">MC Electrical<\/a> in Brisbane about the Fronius relay and smart meter. \u00a0 You can read the blog post they wrote on them <a href=\"http:\/\/mcelectrical.com.au\/blog\/the-fronius-smart-meter\/\" target=\"_blank\" rel=\"noopener noreferrer\">here<\/a>.\u00a0 They told me it is possible to use the Fronius relay without the smart meter.\u00a0 It just won&#8217;t be nearly as smart.<\/p>\n<p>The relay will be cable of switching on a hot water system when rooftop solar output exceeds a preset amount, but without the meter to guide its way, it won&#8217;t be able to take the amount of electricity the household is using into account.\u00a0 In other words it will be operating blind and won&#8217;t be able to tell if activating the hot water system will result in electricity being drawn from the grid due to electricity consumption occurring in the home at that time.<\/p>\n<p>People who are normally out of the house during the day may be happy with just using a blind and dumb relay, but they should still expect to use significantly more grid electricity to heat their water than when used in combination with the smart meter.<\/p>\n<p>To prevent cloudy weather keeping solar output low and resulting in no electricity being sent to the hot water system during the day, the relay will make the hot water system turn on anyway for a period and use at least some grid electricity, so people won&#8217;t be caught without hot water.\u00a0 MC Electrical said they adjust the parameters of relay&#8217;s operation according to the customer&#8217;s situation.<\/p>\n<h2>The Fronius Relay Can Be Used On Other Appliances<\/h2>\n<p>Fronius smart meters and relays aren&#8217;t limited to conventional electric hot water systems and can be used on other devices including energy efficient <a href=\"https:\/\/www.solarquotes.com.au\/hot-water\/heat-pump\/\">heat pump hot water systems<\/a>, pool filters, and pool heaters.\u00a0 Multiple appliances can be controlled through the datamanager, but a separate relay will need to be bought and installed for each one.<\/p>\n<h2>The Fronius Smart Meter Can Export Limit<\/h2>\n<p>The Fronius smart meter can be used to export limit a system, which is something often required in rural areas.\u00a0 If a smart meter is required anyway for export limiting, then getting a relay installed at the same time won&#8217;t cost a great deal more and will allow surplus electricity, that might otherwise go to waste, be put to good use.<\/p>\n<h2>Getting The Most Out Of Fronius Hot Water<\/h2>\n<p>Just how much a household can save on their electricity bills, if anything at all, from using a Fronius smart meter and relay depends on a range of factors including, solar system size, hot water consumption, heating element power, location, controlled tariffs, feed-in tariffs, and electricity plans.<\/p>\n<h2>When It Comes To Solar, Bigger Is Better<\/h2>\n<p>Larger rooftop solar systems will produce more surplus electricity and so reduce the amount of grid electricity required to heat water.<\/p>\n<h2>The More Hot Water You Use, The Better The Economics<\/h2>\n<p>The more hot water a household uses, the more likely investing in a Fronius smart meter and relay will be worthwhile.\u00a0 Larger households tend to use more hot water, as do those in colder parts of the country.<\/p>\n<h2>Smaller Hot Water Elements Are Better<\/h2>\n<div id=\"attachment_14012\" style=\"width: 280px\" class=\"wp-caption alignright\"><img decoding=\"async\" aria-describedby=\"caption-attachment-14012\" class=\"size-full wp-image-14012\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/vest.jpg\" alt=\"Switchboard\" width=\"270\" height=\"315\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/vest.jpg 270w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/vest-257x300.jpg 257w\" sizes=\"(max-width: 270px) 100vw, 270px\" \/><p id=\"caption-attachment-14012\" class=\"wp-caption-text\">Here we see an Austrian about to work on a switchboard.\u00a0 As the member of a safety conscious culture, he is taking the precaution of wearing a reflective vest in case it actually turns out to be a Deceptikon and shoots lasers at him.<\/p><\/div>\n<p>I have a very small hot water heating element.\u00a0 It&#8217;s only 1.8 <a href=\"https:\/\/www.solarquotes.com.au\/glossary.html#kw\">kilowatts<\/a>.\u00a0 Personally, I think anything more than that is a waste.\u00a0 Sure, some people boast about how quickly their big, 4.8 kilowatt heating element can make the contents of their storage tank go from frigid to steaming hot, but when it comes to maximizing solar self consumption, trust me, bigger is not better. This is because the smaller the element, the more likely it is there will be enough surplus solar electricity to run it without needing to draw on grid power.<\/p>\n<p>For a <a href=\"https:\/\/www.solarquotes.com.au\/blog\/5-reasons-your-solar-system-power-is-lower-than-you-expected\/\">variety of reasons<\/a> a solar system with 5 kilowatts of panels may rarely or never produce more than 4 kilowatts of power, even under perfectly clear skies.\u00a0 But if a hot water system&#8217;s heating element is only 1.8 kilowatts, that can be small enough for surplus solar electricity to heat water without the need to draw on grid power, provided there is sufficient sunshine.<\/p>\n<p>If a family uses half the hot water in a 250 liter hot water system in winter and the fresh water that enters the tank is 10 degrees, then with a 1.8 kilowatt heating element it will take over 4 hours of heating for the water temperature to raise to 60 degrees<sup class='endnote'><a href='https:\/\/www.solarquotes.com.au\/blog\/using-fronius-inverter-smart-meter-relay-make-solar-electric-hot-water\/#en-14008-5' id='enref-14008-5' onclick='return hhEndnotes_show(14008)'>5<\/a><\/sup>, which is the minimum temperature hot water systems are normally set to.<\/p>\n<p>But if their heating element draws a hefty 4.8 kilowatts then it would only take 1.5 hours to do the same job, but with 5 kilowatts of solar panels it will be virtually impossible to avoid using at least some grid electricity, even on perfectly clear days.<\/p>\n<h2>Location Counts<\/h2>\n<p>A 5 kilowatt solar system will only produce around 1% more electricity through the year in <a href=\"https:\/\/www.solarquotes.com.au\/installers\/brisbane\/\" target=\"_blank\" rel=\"noopener noreferrer\">Brisbane<\/a> than in <a href=\"https:\/\/www.solarquotes.com.au\/installers\/adelaide\/\" target=\"_blank\" rel=\"noopener noreferrer\">Adelaide<\/a>.\u00a0 But the output in Brisbane is much more constant, with electricity production in the worst winter month averaging 61% of the best summer month.\u00a0 But in Adelaide, output during the worst winter month is only 36% of the best summer month.<\/p>\n<p>In locations where solar output is especially low during winter, which is when the most hot water is used, the more likely it is grid electricity will be need to be used.\u00a0 The coldest parts of Australia tend to have the worst winter solar performance, while the the warmer parts of the country tend to produce considerably more solar electricity in winter, but use less hot water overall and so gain less benefit from having a Fronius smart meter and relay.<\/p>\n<p>It&#8217;s a Catch-11 situation.\u00a0 It&#8217;s like <a href=\"https:\/\/en.wikipedia.org\/wiki\/Catch-22\" target=\"_blank\" rel=\"noopener noreferrer\">Catch-22<\/a>, but only half as bad.<\/p>\n<h2>The Cost Of Controlled Tariffs And Feed-In Tariffs Matter<\/h2>\n<p><img decoding=\"async\" class=\"alignright size-full wp-image-14097\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/arnie.jpg\" alt=\"Arnie\" width=\"270\" height=\"536\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/arnie.jpg 270w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/arnie-151x300.jpg 151w\" sizes=\"(max-width: 270px) 100vw, 270px\" \/><\/p>\n<p>If your goal is to save money it is important to consider how much controlled tariffs cost.\u00a0 These tariffs are often referred to as &#8220;off-peak hot water&#8221;.\u00a0 The lower they are compared to your feed-in tariff, the less money you will save using solar electricity for water heating.<\/p>\n<p>For example, looking at the Origin Solar Boost plan for South Australia, I see it has a feed-in tariff of 18 cents and a controlled load tariff of 21.175 cents.\u00a0 This means if a household on this plan used a fairly typical 1,500 kilowatt-hours a year to heat water using a controlled tariff and then changed to using a Fronius smart meter and relay and managed to use 100% solar electricity for their hot water, they would only save $48 a year on their electricity bills.<\/p>\n<p>If just 15% of the electricity used to heat their water came from the grid, then because the standard tariff is twice as much as the controlled tariff, they would lose money.\u00a0 Since a hot water system using a Fronius relay is likely to average more than 15% grid electricity use over the year due to poor solar production in winter, I would say it is not be a good idea for a household sticking to that particular electricity plan to use a Fronius smart meter and relay for hot water, even if they have a teeny weeny little heating element like I do.<\/p>\n<p>Because feed-in tariffs and controlled tariffs can vary significantly between electricity retail plans, it will be important to carefully examine them to decide if it is worthwhile to change to a different retail plan or if it is a good idea to use a Fronius smart meter and relay at all<sup class='endnote'><a href='https:\/\/www.solarquotes.com.au\/blog\/using-fronius-inverter-smart-meter-relay-make-solar-electric-hot-water\/#en-14008-6' id='enref-14008-6' onclick='return hhEndnotes_show(14008)'>6<\/a><\/sup>.<\/p>\n<h2>Three Examples<\/h2>\n<p>I have taken three different locations in Australia &#8212; rural Queensland, <a href=\"https:\/\/www.solarquotes.com.au\/installers\/sydney\/\" target=\"_blank\" rel=\"noopener noreferrer\">Sydney<\/a>, and Adelaide &#8212; and estimated how much money could be saved on electricity bills each year by using a Fronius smart meter and relay to heat water.\u00a0 In the Sydney and Adelaide examples I have assumed the households use an above average amount of hot water and for every example I have assumed the households have large solar systems, small 1.8 kilowatt heating elements in their hot water systems, and are using the relay and smart meter in combination and not just the relay alone, so little grid electricity will be required for heating water.<\/p>\n<h2>Example &#8212; Rural Queensland<\/h2>\n<p>In rural Queensland electricity prices and feed-in tariffs are fixed.\u00a0 The warm climate results in households using less hot water than in most other states and solar output is more constant.\u00a0 If a household that uses 1,000 kilowatt-hours a year to heat water with a controlled tariff switched to using 100% solar electricity they would save\u00a0 $73 a year.\u00a0 If 10% of the electricity used to heat water came from the grid they would save $62 a year.<\/p>\n<h2>Example &#8212; Sydney<\/h2>\n<p>For Sydney I&#8217;ve assumed the household is on the AGL Everyday NSW Residential Electricity Market Offer retail electricity plan (AGL366955MR).\u00a0 If they use 2,000 kilowatt-hours a year to heat water with a controlled tariff and change to using 100% solar electricity instead, they will save $47 a year.\u00a0 If they use 20% grid electricity to heat water they will instead lose $11 a year.<\/p>\n<h2>Example &#8212; Adelaide<\/h2>\n<p>In the Adelaide example the household is on the People Energy<sup class='endnote'><a href='https:\/\/www.solarquotes.com.au\/blog\/using-fronius-inverter-smart-meter-relay-make-solar-electric-hot-water\/#en-14008-7' id='enref-14008-7' onclick='return hhEndnotes_show(14008)'>7<\/a><\/sup> Standing Offer retail electricity plan (PEO227399SR).\u00a0 If they use 2,000 kilowatt-hours a year to heat water with a controlled tariff and change to using 100% solar electricity, they will save $174 a year.\u00a0 If they use 20% grid electricity to heat water they will instead only save $106 a year.<\/p>\n<div id=\"attachment_14135\" style=\"width: 533px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-14135\" class=\"size-full wp-image-14135\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/2017-08-15_15-28-05.png\" alt=\"graph \" width=\"523\" height=\"625\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/2017-08-15_15-28-05.png 523w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/2017-08-15_15-28-05-251x300.png 251w\" sizes=\"(max-width: 523px) 100vw, 523px\" \/><p id=\"caption-attachment-14135\" class=\"wp-caption-text\">Typical savings per year if 100% of solar is diverted to heat hot water.<\/p><\/div>\n<div id=\"attachment_14136\" style=\"width: 535px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-14136\" class=\"size-full wp-image-14136\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/2017-08-15_15-28-25.png\" alt=\"graph\" width=\"525\" height=\"624\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/2017-08-15_15-28-25.png 525w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/2017-08-15_15-28-25-252x300.png 252w\" sizes=\"(max-width: 525px) 100vw, 525px\" \/><p id=\"caption-attachment-14136\" class=\"wp-caption-text\">Typical savings per year with hot water PV diversion if 10% of your hot water energy still comes from the grid.<\/p><\/div>\n<h2>Adelaide Comes Out Ahead, Sydney Loses<\/h2>\n<p>Both the Queensland and Adelaide examples were better off using the Fronius smart meter and relay to heat water. However, in the Sydney example the household was worse off.\u00a0 So while using the Fronius smart meter and relay can appear to save households money under the right circumstances, extreme care will have to be taken to ensure it won&#8217;t end up costing money.<\/p>\n<p>Because the amount of grid electricity used needs to be minimized for it to be worthwhile, households with less than 4 kilowatts of panels or a hot water system heating element larger than 1.8 to 2.4 kilowatts will need to be especially cautious.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Over the past week or so I&#8217;ve been politely prodded\u00a0 by a plethora of people pushing me to provide information pertaining to solar hot water diverters. A &#8216;hot water diverter&#8217; is a box of power electronics that that sucks up your homes&#8217; surplus solar electricity and diverts it to an electric hot water system instead [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":14139,"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":[27],"tags":[30,614],"class_list":["post-14008","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-solar-hot-water","tag-feed-in-tariffs","tag-fronius","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - 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there is a surplus of solar energy.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.solarquotes.com.au\/blog\/using-fronius-inverter-smart-meter-relay-make-solar-electric-hot-water\/\" \/>\n<meta property=\"og:site_name\" content=\"SolarQuotes Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SolarQuotes\/\" \/>\n<meta property=\"article:published_time\" content=\"2017-08-14T21:36:33+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-10-02T03:25:41+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/2017-08-15_15-38-32.png\" \/>\n\t<meta property=\"og:image:width\" content=\"778\" \/>\n\t<meta property=\"og:image:height\" content=\"517\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Ronald Brakels\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" 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Master of heavily researched deep-dive blog posts, his relentless consumer advocacy has ruffled more than a few manufacturer's feathers over the years. Read Ronald's full bio.","sameAs":["https:\/\/x.com\/BrakelsRonald"],"url":"https:\/\/www.solarquotes.com.au\/blog\/author\/ronald\/"}]}},"jetpack_featured_media_url":"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/2017-08-15_15-38-32.png","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2FF2s-3DW","jetpack-related-posts":[{"id":14357,"url":"https:\/\/www.solarquotes.com.au\/blog\/solar-hot-water-timer\/","url_meta":{"origin":14008,"position":0},"title":"Will A Solar Hot Water Timer Save Or Lose You Money?","author":"Ronald Brakels","date":"August 30, 2017","format":false,"excerpt":"Lately my life has been a lollapalloza of solar electric hot water heating.\u00a0 I've looked at more ways of heating water using solar electricity than you can poke a stick at.\u00a0 Or at least I have if your poking arm is weak and flabby and easily fatigued. Recently I went\u2026","rel":"","context":"In &quot;Solar Hot Water&quot;","block_context":{"text":"Solar Hot Water","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-hot-water\/"},"img":{"alt_text":"hot water timer","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/hot-water-timer.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/hot-water-timer.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/hot-water-timer.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/hot-water-timer.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":70373,"url":"https:\/\/www.solarquotes.com.au\/blog\/premium-fit-hot-water\/","url_meta":{"origin":14008,"position":1},"title":"Premium Feed Tariff &#038; New Hot Water System? Don&#8217;t Make This Mistake!","author":"Ronald Brakels","date":"February 6, 2023","format":false,"excerpt":"A well-meaning plumber recently made a mistake that could have cost a friend hundreds of dollars. Fortunately for her, I was on hand to save the day by explaining that because of her high solar feed-in tariff, her hot water system should only be turned on at night. You see,\u2026","rel":"","context":"In &quot;Solar Hot Water&quot;","block_context":{"text":"Solar Hot Water","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-hot-water\/"},"img":{"alt_text":"Hot water systems and premium solar feed in tariffs.","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/02\/istore-hp.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/02\/istore-hp.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/02\/istore-hp.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/02\/istore-hp.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/02\/istore-hp.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":4534,"url":"https:\/\/www.solarquotes.com.au\/blog\/divert-excess-solar-pv-hot-water-cylinder\/","url_meta":{"origin":14008,"position":2},"title":"How To Divert Your Excess Solar PV to a Hot Water Cylinder.","author":"Mark Cavanagh","date":"February 25, 2015","format":false,"excerpt":"This guest blog post has been written by experienced solar installer, electrician, solar company owner and all round good guy, Mark\u00a0Cavanagh from MC Electrical in Brisbane. Mark answers a\u00a0really common question we are getting here at\u00a0SolarQuotes: \"Can I divert my excess\u00a0solar energy into my hot water cylinder instead of selling\u2026","rel":"","context":"In &quot;Solar Hot Water&quot;","block_context":{"text":"Solar Hot Water","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-hot-water\/"},"img":{"alt_text":"a diversion sign","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2015\/02\/solar-diversion.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2015\/02\/solar-diversion.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2015\/02\/solar-diversion.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":89963,"url":"https:\/\/www.solarquotes.com.au\/blog\/low-zero-solar-tariffs-mb3127\/","url_meta":{"origin":14008,"position":3},"title":"Living With Low (Or Even Zero) Solar Feed-In Tariffs","author":"Michael Bloch","date":"February 28, 2025","format":false,"excerpt":"Minimum solar feed-in tariff rates (such as they are) have been set for what could be the last time in Victoria. But smart solar ownership will still bring significant financial and other benefits; and this applies across Australia where rates have been reducing. In mid-February we reported Victoria\u2019s Energy and\u2026","rel":"","context":"In &quot;General Solar &amp; Storage News&quot;","block_context":{"text":"General Solar &amp; Storage News","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-battery-news\/"},"img":{"alt_text":"Solar feed-in tariff rates","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/02\/solar-feed-in-rates.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/02\/solar-feed-in-rates.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/02\/solar-feed-in-rates.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/02\/solar-feed-in-rates.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/02\/solar-feed-in-rates.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":47883,"url":"https:\/\/www.solarquotes.com.au\/blog\/solar-in-tasmania\/","url_meta":{"origin":14008,"position":4},"title":"Solar Power In Tasmania: How To Triumph Despite Higher Prices &amp; Lower Output","author":"Ronald Brakels","date":"March 8, 2021","format":false,"excerpt":"If you are lucky enough to live in Tasmania, I have some bad news: Using solar panels to get low bills is more challenging than on the mainland.\u00a0 But I also bring good news: Despite drawbacks, rooftop solar power - done right - can still be an excellent investment for\u2026","rel":"","context":"In &quot;Solar Installation&quot;","block_context":{"text":"Solar Installation","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-installation\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/03\/solar-tas-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/03\/solar-tas-2.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/03\/solar-tas-2.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/03\/solar-tas-2.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/03\/solar-tas-2.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":42829,"url":"https:\/\/www.solarquotes.com.au\/blog\/catch-solar-relay-review\/","url_meta":{"origin":14008,"position":5},"title":"Catch Solar Relay: Put Your Solar Self Consumption On Autopilot","author":"Finn Peacock","date":"September 14, 2020","format":false,"excerpt":"Update: See our 2024 review of the Catch Solar Relay's new features here. As we approach the final quarter of 2020 even COVID can't stop Australians installing more solar than ever before. And with so much solar electricity being generated in the middle of the day, the value of energy\u2026","rel":"","context":"In &quot;Solar Innovations&quot;","block_context":{"text":"Solar Innovations","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-innovations\/"},"img":{"alt_text":"Catch solar relay review","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2020\/09\/catch-solar-relay-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2020\/09\/catch-solar-relay-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2020\/09\/catch-solar-relay-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2020\/09\/catch-solar-relay-1.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2020\/09\/catch-solar-relay-1.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/14008","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/comments?post=14008"}],"version-history":[{"count":97,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/14008\/revisions"}],"predecessor-version":[{"id":87235,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/14008\/revisions\/87235"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/media\/14139"}],"wp:attachment":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/media?parent=14008"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/categories?post=14008"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/tags?post=14008"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}