{"id":17242,"date":"2017-12-13T11:26:58","date_gmt":"2017-12-13T00:56:58","guid":{"rendered":"https:\/\/www.solarquotes.com.au\/blog\/?p=17242"},"modified":"2024-01-25T16:16:39","modified_gmt":"2024-01-25T06:46:39","slug":"scrap-your-1-5kw","status":"publish","type":"post","link":"https:\/\/www.solarquotes.com.au\/blog\/scrap-your-1-5kw\/","title":{"rendered":"Should you scrap your 1.5kW solar and replace it with a bigger system?"},"content":{"rendered":"<div id=\"attachment_17557\" style=\"width: 660px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-17557\" class=\"size-full wp-image-17557\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/12\/Rag-and-Bone.jpg\" alt=\"solar rag and bone man\" width=\"650\" height=\"480\" \/><p id=\"caption-attachment-17557\" class=\"wp-caption-text\">Should you bite the bullet and scrap your 1.5kW solar system so you can fit a bigger system on your roof?<\/p><\/div>\n<p>Five to eight years ago, just as the Australian solar industry was getting underway, many people locked in high feed in tariffs for their new, cutting-edge solar power systems.\u00a0 For example, many people in Victoria with systems installed before 2012 are now getting 71.3 cents per kilowatt-hour of solar electricity exported into the grid.\u00a0 And they will continue to receive this for almost 7 more years.<!--more--><\/p>\n<p>While these sky high feed-in tariffs sound wonderful &#8212; and trust me, they are wonderful &#8212; most people who locked in dreamy <a href=\"https:\/\/www.solarquotes.com.au\/systems\/feed-in-tariffs\/\">feed-in tariffs<\/a> only had very small solar systems, with the most common size being 1.5 <a href=\"https:\/\/www.solarquotes.com.au\/glossary.html#kw\">kilowatts<\/a>.\u00a0 This is because back then, not only were solar power systems incredibly expensive, but subsides were <a href=\"https:\/\/www.solarquotes.com.au\/systems\/1-5kW\/\">greater for smaller systems<\/a>.<\/p>\n<p>Having a high feed-in tariff \u00a0isn&#8217;t necessarily the golden goose it might seem for owners of small systems who don&#8217;t export much of their solar electricity. It&#8217;s more a golden willy wagtail or in Queensland perhaps a golden gecko.<\/p>\n<div id=\"attachment_17530\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-17530\" class=\"size-full wp-image-17530\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/12\/Golden_geckos.jpg\" alt=\"Golden Geko\" width=\"800\" height=\"600\" \/><p id=\"caption-attachment-17530\" class=\"wp-caption-text\">If you google &#8220;Golden Gecko&#8221; this is the first image that comes up. While it looks like Queensland, something isn&#8217;t quite right. The geckos look a little too happy.<\/p><\/div>\n<p>As a result, many of the owners of these old PV systems are in a quandary: should they scrap their\u00a0small 1.5 kilowatt system, along with the high feed-in tariff and replace it with a larger system that generates more electricity?<\/p>\n<h2>Should you replace your 1.5kW with a larger system?<\/h2>\n<p>The answer to that question can be clearly given in just two words &#8212; it depends.<\/p>\n<p>In <strong>Victoria<\/strong> the premium feed-in tariff is so high you probably won&#8217;t come out ahead.<\/p>\n<p>In <strong> the ACT <\/strong>a high feed-in tariff combined with Australia&#8217;s lowest electricity prices makes it a bad idea.<\/p>\n<p>In <strong>Perth<\/strong> the feed-in tariff the new system will get is so low you&#8217;re also unlikely to come out ahead.<\/p>\n<p>But in <strong>Tasmania, Queensland, and South Australia<\/strong>, it can save you money, provided your cost of capital isn&#8217;t too high.<\/p>\n<p>While 1.5 kilowatts is the most common size that gets a high feed-in tariff, some people did buy larger systems, with the limit generally being 5 kilowatts.\u00a0 So if you&#8217;re receiving a 71.3 cent feed-in tariff for a <a href=\"https:\/\/www.solarquotes.com.au\/systems\/5kW\/\">5 kilowatt solar power system<\/a>, this article is not for you.\u00a0 You should be raking in that feed-in tariff money.\u00a0 In fact, if you are single, send me your phone number<sup class='endnote'><a href='https:\/\/www.solarquotes.com.au\/blog\/scrap-your-1-5kw\/#en-17242-1' id='enref-17242-1' onclick='return hhEndnotes_show(17242)'>1<\/a><\/sup>.<\/p>\n<h2>Existing High Feed-In Tariffs And Their End Dates<\/h2>\n<p>If you have locked in a high feed-in tariff for your solar system then you probably know about it.\u00a0 If there is any doubt, you can check your electricity bill to see if you get a fat payment for every kilowatt-hour you send into the grid.\u00a0 It is possible you may not know when your high feed-in tariff will end, so here&#8217;s a list of all the remaining old-time high feed-in tariffs and when they expire:<\/p>\n<ul>\n<li><strong>Victoria:<\/strong>\u00a0 A minimum of <a href=\"https:\/\/www.energy.vic.gov.au\/households\/solar-premium-feed-in-tariff\" target=\"_blank\" rel=\"noopener\">60 cents a kilowatt-hour<\/a> with a retail feed-in tariff of at least 11.3 cents on top of this, making for a minimum feed-in tariff of 71.3 cents.\u00a0 Ends in late 2024.<\/li>\n<li><strong>The ACT:<\/strong>\u00a0 Rooftop solar applied for before the 13th of July 2011 could lock in a feed-in tariff which is now a straight 45 cents.\u00a0 It can last for 20 years, so some households will still be receiving this in 2031.<\/li>\n<li><strong>Western Australia:<\/strong>\u00a0 Those who applied for rooftop solar from the 1st of July 2010 till the 30th of June 2011 could lock-in a 40 cent feed-in tariff for 10 years and those who applied in July 2011 could lock-in 20 cents for 10 years.\u00a0 This will end from 2020 to 2021.<\/li>\n<li><strong>Tasmania:<\/strong>\u00a0 Those who applied to install solar before the end of August 2013 received a <a href=\"http:\/\/www.economicregulator.tas.gov.au\/electricity\/pricing\/feed-in-tariffs\" target=\"_blank\" rel=\"noopener\">feed-in tariff equal to the retail cost of electricity<\/a>.\u00a0 But this ends at the start of 2019 so there&#8217;s only one year left to go.<\/li>\n<li><strong>South Australia:<\/strong>\u00a0 Applying to install solar panels before the 30th of September 2011 would lock-in a a <a href=\"http:\/\/www.sa.gov.au\/topics\/energy-and-environment\/energy-bills\/solar-feed-in-payments\" target=\"_blank\" rel=\"noopener\">44 cent distributor feed-in tariff<\/a> until the 30th of June 2028.\u00a0 The retail feed-in tariff is received on top of this, so a household with a 17 cent retailer tariff would receive a total of 61 cents for every kilowatt-hour of solar electricity exported.<\/li>\n<li><strong>Queensland:<\/strong>\u00a0 Those who applied to install rooftop solar the 10th of July 2012 received a straight <a href=\"https:\/\/www.qld.gov.au\/housing\/buying-owning-home\/energy-water-home\/solar\/feed-in-tariffs\/solar-bonus-scheme-44c\" target=\"_blank\" rel=\"noopener\">44 cent feed-in tariff<\/a> which will last until the 1st of July 2028.<\/li>\n<\/ul>\n<p><strong>NSW<\/strong> used to have a generous feed-in tariff, but that came to an end last year.<\/p>\n<p>While it is permitted to replace components that fail, it&#8217;s usually not possible to increase the capacity of a system or add a second solar system without losing the feed-in tariff.\u00a0 In Queensland, while the inverter size can&#8217;t be increased, it is possible to increase the panel capacity up to a maximum of one-third more than the inverter capacity, but only if your inverter meets modern standards.<\/p>\n<p>There are still high feed-in tariffs available in two places in Australia and they are the Northern Territory where the feed-in tariff is equal to the retail price of electricity and some parts of rural Western Australia.\u00a0 The drawback of the high feed-in tariffs in rural WA are it can be impossible to receive permission to install solar panels.\u00a0 But if you can get solar in these places, it&#8217;s a good idea to install as much as you can.<\/p>\n<h2>Old Versus New Comparison<\/h2>\n<p>Most homes in Australia have single phase power and the maximum amount of solar panel capacity they can usually install without paying extra for export limiting is 6.66 kilowatts.\u00a0 Homes with three phase power that aren&#8217;t in Western Australia can install more solar provided they can fit it on their roofs, but I will limit myself to comparing the annual savings from keeping a 1.5 kilowatt system with a high feed-in tariff with the annual savings from replacing it with a 6.5 kilowatt system.<\/p>\n<h2>Replacing Versus Expanding<\/h2>\n<p>If you decide to give up your old feed-in tariff and expand your solar energy capacity, you have a choice between:<\/p>\n<ol>\n<li>Removing the old system and replacing it with a new one.<\/li>\n<li>Keeping the old system in place and installing a separate new system.<\/li>\n<li>Attaching the old panels to a new inverter so they become part of a new system.<\/li>\n<\/ol>\n<p>While it may seem that keeping the old system or making use of the old solar panels would be the cheaper option, this often isn\u2019t the case.\u00a0 The larger a new solar system is, the cheaper it will be per watt and it gives the advantage that the entire system, including the panels and inverter, will be covered by new warranties.\u00a0 This can avoid the need to make expense repairs to the old system, as if you have locked in a high feed-in tariff then your inverter is almost certainly out of warranty and could potentially die at any time.<\/p>\n<p>Furthermore, any system old enough to get a high feed-in-tariff will be almost certainly be using solar panels and inverters that are not <a href=\"https:\/\/support.solarquotes.com.au\/hc\/en-us\/articles\/115001954693-I-ve-been-told-my-existing-solar-system-inverter-is-not-compliant-with-the-current-standards-What-do-I-have-to-do-\" target=\"_blank\" rel=\"noopener\">compliant with the latest Australian Standards<\/a>. If you upgrade it, the whole installation will need to comply with the current standards. For most people this will require a new inverter and panels, essentially a whole new system.<\/p>\n<p>Finally, most local networks (<a href=\"https:\/\/www.solarquotes.com.au\/glossary.html#dnsp\" target=\"_blank\" rel=\"noopener\">DNSPs<\/a>) only allow 5kW of inverters on a typical, single phase home.<\/p>\n<p>So I will assume the old system will be removed and completely replaced with a new one.<\/p>\n<h2>Household Solar Energy Self Consumption<\/h2>\n<p>How much of a solar power system&#8217;s electricity is consumed by the home it is bolted to will affect the amount of money it saves over a year.\u00a0 Personally, I always talk about the self consumption rate of households, but just to make things a little confusing, this graph from the <a href=\"https:\/\/www.energycouncil.com.au\/media\/6016\/2016-06-10_australian-energy-council-solar-report_sep-2016.pdf\" target=\"_blank\" rel=\"noopener\">Australian Energy Council&#8217;s Solar Report December 2016<\/a> turns that upside down and shows the export rate of households for different sizes of solar systems.\u00a0 But don&#8217;t worry, it&#8217;s only a little confusing.\u00a0 I&#8217;m sure you can work it out:<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-17489\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/12\/exportrate.jpg\" alt=\"\" width=\"622\" height=\"655\" \/><\/p>\n<p>Generally, the smaller the system the higher the self consumption rate and according to the graph, a household with a 1.5 kilowatt system will self consume around two-thirds of the electricity it produces.\u00a0 I realize that two-thirds isn&#8217;t quite the same as the 63% self consumption rate on the graph, but I&#8217;ll use 66.6% because it&#8217;s easier to work with a nice round fraction and not at all because that is the number the voices scream at me from the bottomless pits that have been torn in my mind<sup class='endnote'><a href='https:\/\/www.solarquotes.com.au\/blog\/scrap-your-1-5kw\/#en-17242-2' id='enref-17242-2' onclick='return hhEndnotes_show(17242)'>2<\/a><\/sup>.<\/p>\n<p>But people who are out of the house for most of the day may have a self consumption rate of only around one-third.\u00a0 So I will also estimate savings for homes with one-third self consumption, as this can considerably increase the amount of money saved.<\/p>\n<p>However, if you are one of these people who does things like turn your refrigerator off during the day to try to get your solar electricity self consumption down to zero and maximize your feed-in tariff money, then I&#8217;d suggest that maybe you are taking things a little too far and you should probably get another hobby<sup class='endnote'><a href='https:\/\/www.solarquotes.com.au\/blog\/scrap-your-1-5kw\/#en-17242-3' id='enref-17242-3' onclick='return hhEndnotes_show(17242)'>3<\/a><\/sup>.<\/p>\n<p>According to the above graph a home with a 5 kilowatt solar system will typically self consume around 26% of the solar electricity generated.\u00a0 But since I&#8217;ll be using a 6.5 kilowatt system for comparison, which is off the graph, I&#8217;ll estimate self consumption to be 20% for a typical household and 10% for one where there is usually no one at home during the day.<\/p>\n<h2>Estimating Annual System Output<\/h2>\n<p>The United States has given the world some amazing things.\u00a0 For example, they gave us the <a href=\"https:\/\/en.wikipedia.org\/wiki\/Apollo_program\" target=\"_blank\" rel=\"noopener\">space program<\/a> that put humanity on the moon and the <a href=\"https:\/\/en.wikipedia.org\/wiki\/Moon_landing_conspiracy_theories\" target=\"_blank\" rel=\"noopener\">conspiracy theory<\/a> that says they didn&#8217;t.<\/p>\n<p>One very useful thing they have gifted to us is the <a href=\"http:\/\/pvwatts.nrel.gov\/\" target=\"_blank\" rel=\"noopener\">PVWatts site<\/a> that can estimate the output of solar systems around the world.\u00a0 Sure, you have to be careful to tell it &#8220;Melbourne Australia&#8221; and &#8220;Darwin Australia&#8221;, otherwise it will take you to towns with those names in the US<sup class='endnote'><a href='https:\/\/www.solarquotes.com.au\/blog\/scrap-your-1-5kw\/#en-17242-4' id='enref-17242-4' onclick='return hhEndnotes_show(17242)'>4<\/a><\/sup>, but apart from that peccadilo<sup class='endnote'><a href='https:\/\/www.solarquotes.com.au\/blog\/scrap-your-1-5kw\/#en-17242-5' id='enref-17242-5' onclick='return hhEndnotes_show(17242)'>5<\/a><\/sup> it&#8217;s really quite handy.<\/p>\n<p>PVWatts says a 1.5 kilowatt system in Melbourne that faces north and is tilted at a 20 degree angle will produce 2,058 kilowatt-hours a year.\u00a0 But that figure is a little optimistic.\u00a0 Solar panels slowly degrade over time and older systems with high feed-in tariffs are also likely to have inverters that are a little less efficient than modern ones.\u00a0 Also, not every system is faces directly north.\u00a0 To allow for this I will reduce the figure PVWatts gives by 10% and assume it will produce 1,852 kilowatt-hours a year.<\/p>\n<p>PVWatts says a 6.5 kilowatt system that faces north at an angle of 20 degrees will produce 8,918 kilowatt-hours over a year.\u00a0 But while these panels will be newer and inverter is likely to be more efficient, because of the large size of the system it&#8217;s going to be harder to optimally position all the panels and to account for this I will reduce their output by the same 10% amount.\u00a0 This means I&#8217;ll expect it to produce 8,026 kilowatt-hours a year.<\/p>\n<h2>Savings From A Melbourne High Feed-In Tariff 1.5 KW System<\/h2>\n<p>Using the SolarQuotes <a href=\"https:\/\/www.solarquotes.com.au\/energy\/\" target=\"_blank\" rel=\"noopener\">retail electricity plan comparison tool<\/a> I see that while electricity prices in Melbourne are considerably higher than what they were a year ago, by Australian standards they are actually pretty good<sup class='endnote'><a href='https:\/\/www.solarquotes.com.au\/blog\/scrap-your-1-5kw\/#en-17242-6' id='enref-17242-6' onclick='return hhEndnotes_show(17242)'>6<\/a><\/sup> and, after discounts, the most cost effective plan I can see charges 18.3 cents per kilowatt-hour of grid electricity and has a feed-in tariff of 11.3 cents.\u00a0 Adding this onto the base 60 cents of Victoria&#8217;s old premium feed-in tariff gives a total of 71.3 cents.<\/p>\n<p>With a self consumption rate of 66.6% the 1.5 kilowatt system will save a household $666.60 a year<sup class='endnote'><a href='https:\/\/www.solarquotes.com.au\/blog\/scrap-your-1-5kw\/#en-17242-7' id='enref-17242-7' onclick='return hhEndnotes_show(17242)'>7<\/a><\/sup> on electricity bills.\u00a0 If the self consumption rate is only 33% then the high feed-in tariff causes the savings to jump to $994.<\/p>\n<h2>Savings From A New Melbourne 6.5 Kilowatt System<\/h2>\n<p>After crunching the numbers I find that a 6.5 kilowatt system with the current 11.3 cent feed-in tariff and a 20% self consumption rate will save a Melbourne household $1,020 a year.\u00a0 If the self consumption rate is only 10% then it will save $963.<\/p>\n<p>But while this makes a new system appear worthwhile, it unfortunately ignores the cost of capital.\u00a0 This is important to take into consideration because it is very unlikely that a brand new 6.5 kilowatt solar power system will fall off the back of a truck, bounce off the road, and land fully installed on your roof.\u00a0 The only realistic way you are going to get one is to pay an installer to put it there.\u00a0 So I will assume the system will be completely replaced and the total cost of the new system and disposing of the old one will come to $8,000.<\/p>\n<h2>Estimating The Capital Cost Of A New System<\/h2>\n<p>To work out the yearly savings from a new <a href=\"https:\/\/www.solarquotes.com.au\/solar101.html\">solar power system<\/a> it is necessary to estimate what the cost of capital over a year will be.\u00a0 I am going to use a very simple method.\u00a0 Some people might say it is too simple, but fortunately, through a stroke of sheer luck, I don&#8217;t care.<\/p>\n<p>I am simply going to say that people who don&#8217;t really have anything better to do with their money other than put it in the bank or make a house payment have a cost of capital of 5% and simply deduct 5% of the $8,000 cost of a new system from its yearly savings.\u00a0 I am not going to worry about anything else and simply\u00a0 assume the new system will fully pay for itself after the high feed-in tariff ends, which will be within 10 years everywhere except the ACT.<\/p>\n<p>Some people have a higher cost of capital.\u00a0 These are either people who don&#8217;t have home equity or other cheap way of borrowing money, or who make a decent return from the money they do have such as by investing it in their own business or the share market.\u00a0 I will assume these people have a cost of capital of 8% and deduct 8% of the $8,000 cost of a new system from their yearly savings.<\/p>\n<p>It is quite possible for people&#8217;s cost of capital to be over 8% but if this is you, I can tell you now you probably aren&#8217;t going to be better off replacing a high feed-in tariff solar system.\u00a0 Instead, cut up your credit cards, pay off the <a href=\"https:\/\/www.youtube.com\/watch?v=4LJxviaFukM\" target=\"_blank\" rel=\"noopener\">Dutch mafia<\/a>, or do whatever else you need to get your finances in order and then look at replacing your old system.<\/p>\n<h2>Graph Of Potential Savings For Melbourne<\/h2>\n<p>If we take the yearly savings that are possible with the different self consumption rates and cost of capital for Melbourne and then put them in a graph we get this:<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-17510\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/12\/melbourne.jpg\" alt=\"Melbourne\" width=\"882\" height=\"408\" \/><\/p>\n<p>As you can see, while it is close for people who currently have typical self consumption and a low cost of capital, Melbournites aren&#8217;t likely to come out ahead economically.\u00a0 And for people who currently have a low self consumption rate, Victoria&#8217;s massive premium solar feed-in tariff means these households are way ahead if they keep their old systems.<\/p>\n<p>Using the same method, I will now make graphs for every capital where it&#8217;s possible to have a locked-in high feed-in tariff.\u00a0 I&#8217;ll continue in the order I have started, from worst to best.<\/p>\n<h2>Canberra<\/h2>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-17594\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/12\/cannberrabetter.jpg\" alt=\"Canberra\" width=\"882\" height=\"411\" \/><\/p>\n<p>While the straight 45 cent feed-in tariff isn&#8217;t the highest, Canberra does have the lowed grid electricity prices in Australia and so scrapping an old system is not likely to pay for itself.\u00a0 The low cost of electricity makes it an especially bad idea if you have a high cost of capital.<\/p>\n<p>(I have changed this graph from how I originally had it because I used the wrong information for the ACTs old premium tariff.\u00a0 Thanks to Tony for pointing this out in the comments.\u00a0 I hope the information I have now is correct.)<\/p>\n<h2>Graph For Perth<\/h2>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-17525\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/12\/perth.jpg\" alt=\"Perth\" width=\"880\" height=\"408\" \/><\/p>\n<p>Because Western Australia&#8217; current feed-in tariff is the lowest in Australia, getting a new system isn&#8217;t likely to pay for itself.\u00a0 But this could all change if Western Australia increases its feed-in tariff, at which point I suggest we all hop on flying pigs and ride them to Fremantle for a party.<\/p>\n<h2>Hobart<\/h2>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-17522\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/12\/hobart.jpg\" alt=\"Hobart\" width=\"880\" height=\"410\" \/><\/p>\n<p>Hobart is the worst city in Australia for sunshine.\u00a0 But, with a low cost of capital, it can be worthwhile to replace an old solar system and lose a high feed-in tariff.\u00a0 Tasmania&#8217;s premium is ending in one year anyway, so it&#8217;s definitely not too soon to start saving for a larger PV system whether or not it&#8217;s worth losing a high feed-in tariff now.<\/p>\n<h2>Brisbane<\/h2>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-17518\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/12\/brisbane.jpg\" alt=\"\" width=\"883\" height=\"408\" \/><\/p>\n<p>Under the right conditions it can be worthwhile for people in Queensland to ditch their 1.5 kilowatt systems and install something larger.\u00a0 And grid operators there will love you if you do, since they keep complaining about high feed-in tariff households waiting until the evening to use electricity, which makes it harder to meet peak demand.<\/p>\n<p>But the figures for Queensland could actually be a lot better than the graph suggests as, starting next year, Queenslanders may be able to get <a href=\"https:\/\/www.solarquotes.com.au\/blog\/queensland-solar-initiatives-mb0264\/\">interest free loans for solar<\/a>.\u00a0 Details of how this will work don&#8217;t appear to be online yet, so I didn&#8217;t include it in the graph, but if you can get 6.5 kilowatt system interest free then it definitely makes sense to replace a 1.5 kilowatt system with a high feed-in tariff, but if it&#8217;s over 2 kilowatts you&#8217;ll want to think about it.\u00a0 Unfortunately, some of the language used by the state government makes me think these interest free loans will not be made available to everyone.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2>Adelaide<\/h2>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-17520\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/12\/adelaide.jpg\" alt=\"\" width=\"882\" height=\"410\" \/><\/p>\n<p>Adelaide is the best capital in Australia for scrapping a high feed-in tariff and if your cost of capital is low the savings can be bloody good.\u00a0 Even if your cost of capital is high and your self consumption low you should come close to breaking even.\u00a0 So if you are in Adelaide and have money in the bank, scrap that puny 1.5 kilowatt solar power system and get yourself something decent.<\/p>\n<h2>What About Systems Smaller Or Larger Than 1.5 Kilowatts?<\/h2>\n<p>If you have a system that is only 1 kilowatt then the savings it provides will be around two-thirds of what&#8217;s shown in the graphs above.\u00a0 This means it will often be worthwhile to replace it.\u00a0 Savings from a 2 kilowatt system will be about one quarter more than in the graphs and so it will generally make sense to hang onto it.\u00a0 Unless you can get a zero interest loan or something.<\/p>\n<h2>Current Feed-In Tariffs May Change<\/h2>\n<p>It is definitely possible feed-in tariffs will <a href=\"https:\/\/www.solarquotes.com.au\/blog\/solar-feed-tariffs-likely-fall-within-3-years\/\">fall in the future<\/a> and so increase the value of hanging onto a locked-in high feed-in tariff.\u00a0 But I am very confident the cost of rooftop solar energy will continue to decline, despite the gradual <a href=\"https:\/\/www.solarquotes.com.au\/blog\/solar-panel-rebate-phased-1st-january-2017\/\">phasing out<\/a> of the &#8220;solar rebate<sup class='endnote'><a href='https:\/\/www.solarquotes.com.au\/blog\/scrap-your-1-5kw\/#en-17242-8' id='enref-17242-8' onclick='return hhEndnotes_show(17242)'>8<\/a><\/sup>&#8220;, and that may offset any decrease in feed-in tariffs.<\/p>\n<h2>My Solar Power System Died!<\/h2>\n<p>The older a system gets the more likely it is that something will fail and require expensive repairs.\u00a0 This is most likely to be the inverter if it hasn&#8217;t already been replaced, but solar panels and even wiring can die in a variety of different ways.<\/p>\n<p>It is likely to cost around $1,000 to replace a 1.5 kilowatt inverter.\u00a0 If you get a high quality inverter it will cost more, but in this particular situation a high quality inverter may not be a good choice, as even a cheap one is likely to last until your high feed-in tariff ends and even if it dies as soon as its 5 year warranty is over, by that time there is an excellent chance by that time rooftop solar will have fallen enough in price to make it worthwhile to simply install a larger system.<\/p>\n<p>If your old solar energy system of around 1.5 kilowatts need repairs it may make sense to pay for them in Victoria, Queensland, and the ACT, particularly if you have a high cost of capital.\u00a0 It&#8217;s possible it will be worthwhile in Perth, despite its high feed-in tariff ending within 3 years, but its very unlikely to pay for itself in Adelaide and sure as hell won&#8217;t pay for itself in Tasmania where the high feed-in tariff is ending in one year.<\/p>\n<h2>Save The Planet!<\/h2>\n<p>I have only discussed the economics of replacing a small solar power system with a high feed-in tariff.\u00a0 If you want to help the environment then you could definitely find it worthwhile to install a larger system.\u00a0 But if you are getting a pretty sweet deal from a high feed-in tariff, I will mention you can help the environment by installing a system on the roof of a relative or by donating one to charity.\u00a0 You could also invest in energy efficiency measures in your home that will both reduce emissions and increase the amount of solar energy you send into the grid.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Five to eight years ago, just as the Australian solar industry was getting underway, many people locked in high feed in tariffs for their new, cutting-edge solar power systems.\u00a0 For example, many people in Victoria with systems installed before 2012 are now getting 71.3 cents per kilowatt-hour of solar electricity exported into the grid.\u00a0 And [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":17557,"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":[56],"tags":[],"class_list":["post-17242","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-economics","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the 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Has it sat on your roof churning photons into electrical energy for 10 years or more? Has it earned you a heap of money because it gets an old, premium feed-in tariff far higher than anything available now? If\u2026","rel":"","context":"In &quot;Economics Of Solar&quot;","block_context":{"text":"Economics Of Solar","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/economics\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/02\/upgrade-time.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/02\/upgrade-time.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/02\/upgrade-time.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/02\/upgrade-time.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/02\/upgrade-time.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":116,"url":"https:\/\/www.solarquotes.com.au\/blog\/nsw-feed-in-tariff-surprise-its-gross-in-a-good-way\/","url_meta":{"origin":17242,"position":2},"title":"NSW Feed In Tariff Surprise: It&#8217;s Gross (in a good way!)","author":"Finn Peacock","date":"November 10, 2009","format":false,"excerpt":"Yesterday the NSW Government surprised renewable energy fans by switching the new feed in tariff from a net to a gross tariff. This means that owners of solar systems in NSW will now get 60c per kwh for all the electricity they generate. Previously you were only going to get\u2026","rel":"","context":"In &quot;Solar Policy&quot;","block_context":{"text":"Solar Policy","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-policy\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":85222,"url":"https:\/\/www.solarquotes.com.au\/blog\/flexible-exports-sa-mb2962\/","url_meta":{"origin":17242,"position":3},"title":"More Flexible Solar Exports Suburbs In SA Soon","author":"Michael Bloch","date":"July 12, 2024","format":false,"excerpt":"Owners of new or upgraded solar systems in hundreds more suburbs and towns in South Australia will have the opportunity to sign up for flexible exports later this month. Home solar uptake in South Australia has seen more than 404,000 systems installed across the state to date - pretty impressive\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":"South Australia - flexible exports for solar","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/07\/flexible-exports-sa.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/07\/flexible-exports-sa.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/07\/flexible-exports-sa.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/07\/flexible-exports-sa.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/07\/flexible-exports-sa.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":70373,"url":"https:\/\/www.solarquotes.com.au\/blog\/premium-fit-hot-water\/","url_meta":{"origin":17242,"position":4},"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":19688,"url":"https:\/\/www.solarquotes.com.au\/blog\/tasmania-solar-tariff-mb0489\/","url_meta":{"origin":17242,"position":5},"title":"A Better Solar Feed-In Tariff For Tasmania Soon(ish)?","author":"Michael Bloch","date":"March 5, 2018","format":false,"excerpt":"The Liberals have been returned to power in Tasmania - and the party has previously stated it wants to boost the uptake of small scale solar energy systems in the state. The solar feed in tariff in Tasmania is currently a whisker over 8.9c per kilowatt hour for electricity exported\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 tariffs in Tasmania","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/03\/solar-tariff-tasmania.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/03\/solar-tariff-tasmania.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/03\/solar-tariff-tasmania.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/03\/solar-tariff-tasmania.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/17242","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=17242"}],"version-history":[{"count":71,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/17242\/revisions"}],"predecessor-version":[{"id":81270,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/17242\/revisions\/81270"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/media\/17557"}],"wp:attachment":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/media?parent=17242"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/categories?post=17242"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/tags?post=17242"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}