{"id":1864,"date":"2012-08-17T19:53:24","date_gmt":"2012-08-17T10:23:24","guid":{"rendered":"http:\/\/www.solarquotes.com.au\/blog\/?p=1864"},"modified":"2017-01-16T12:11:49","modified_gmt":"2017-01-16T01:41:49","slug":"where-should-your-solar-inverter-go-and-should-you-worry-about-voltage-drops","status":"publish","type":"post","link":"https:\/\/www.solarquotes.com.au\/blog\/where-should-your-solar-inverter-go-and-should-you-worry-about-voltage-drops\/","title":{"rendered":"Where should your solar inverter go and should you worry about voltage drops?"},"content":{"rendered":"

I got a great email the other day:<\/p>\n

“One solar installer has told me that it is best for the inverter to be as close as possible to the panels and NOT to the meter box as your checklist indicates. Is he crazy?”<\/p><\/blockquote>\n

Short answer.<\/strong> Yes – he’s crazy.<\/p>\n

Longer answer:<\/strong><\/p>\n

As close as possible to the panels? Whatcha gonna do put it on the roof?<\/p>\n

I get a lot of stick for this advice in one of my solar installation videos<\/a>:<\/p>\n

\"Solar<\/a>

Sometimes I get heat for recommending that you put your solar inverter as close to your fusebox as possible.<\/p><\/div>\n

The argument against this advice is basically that the voltage drop is proportional to the length of the wire and that the voltage drop between the panels and the inverter is (allegedly) more critical than the voltage drop between the inverter and the meter. Therefore you should minimise the \u00a0length of wire from the panels to the inverter at the expense of the length of wire from the inverter to the grid\/meter.<\/p>\n

I’m not sure where this argument comes from. The truth is that\u00a0the voltage drop that will cause the most problems is on the 240V AC side.<\/p>\n

If you want to be sure that your solar system will operate reliably, then the\u00a0voltage drop between the inverter and your grid connection needs to be less than 1%.<\/p>\n

Why? Here I’ll quote from a Grid Connect PV manual by GSES<\/a>:<\/p>\n

\u201cAlthough not mentioned in AS\/NZS 5033:2012, AC voltage drop\/rise [i.e. between the inverter and the switchboard] should be kept as low as possible. The purpose of this is to keep the voltage rise to a minimum – this is to prevent voltage rise in the local grid. High levels of voltage in sections of the grid may lead to overvoltage tripping in grid connected inverters. The allowable voltage rise depends upon the local state rules that are in effect. However, under the CEC Guidelines which were effective as of the 1st of February, 2013, the new recommended AC voltage drop\/rise from the inverter to the point of connection is 1%.\u201d<\/p><\/blockquote>\n

Of course the best way to minimise voltage drops in your solar system – which will maximise your power output and maximise the return on investment – is to use cables that are as short and as thick as practicably possible. The thicker the cable, the lower the voltage drop across the cable. So if you absolutely need a long run of cable – you can usually compensate with thicker wire.<\/p>\n

Typical wire thickness (measured in cross sectional area – millimetres squared)\u00a0for the DC cables that run from the panels to the inverter is 1.5mm\u00b2, 2.5mm\u00b2, 4mm\u00b2, and 6mm\u00b2. If you want to minimise losses insist on at least 4mm\u00b2. Believe me some of the large and super cheap solar installation companies want to save every last cent on every install and will try to get away with the 1.5mm\u00b2 wire!<\/p>\n

As for the AC cable, i.e. from the inverter to the meter, don’t go smaller than 6mm\u00b2. And if you have to place your inverter more than a few metres from the meter then go \u00a0thick enough to keep the losses in that wire less than 1%.<\/p>\n

My advice is to stipulate to your installer (in writing) that the losses in the wires (voltage drops) should be less that 2% overall for the system as a whole. After all electricity is expensive and wire is cheap!<\/p>\n","protected":false},"excerpt":{"rendered":"

I got a great email the other day: “One solar installer has told me that it is best for the inverter to be as close as possible to the panels and NOT to the meter box as your checklist indicates. Is he crazy?” Short answer. Yes – he’s crazy. 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This can freak out some solar customers when they see, for example 3.25kW of panels proposed to be connected to a 3kW inverter in\u2026","rel":"","context":"In "Solar Inverters"","block_context":{"text":"Solar Inverters","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-inverters\/"},"img":{"alt_text":"solar inverter and panels","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2013\/05\/inverter-sizing.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2013\/05\/inverter-sizing.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2013\/05\/inverter-sizing.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":6172,"url":"https:\/\/www.solarquotes.com.au\/blog\/an-eastwest-spit-of-solar-panels-on-a-single-string-can-work-well\/","url_meta":{"origin":1864,"position":1},"title":"East West Facing Solar Panels On A Single Inverter Input Can Work Well","author":"Ronald Brakels","date":"July 15, 2016","format":false,"excerpt":"Most Australian solar installations use string inverters where solar panels are connected in series with\u00a0an electrical cable. 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In the\u00a0configuration above, each string can have a different numbers of panels\u2026","rel":"","context":"In "Solar Inverters"","block_context":{"text":"Solar Inverters","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-inverters\/"},"img":{"alt_text":"east and west facing solar panels","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2016\/07\/east-west-facing-solar.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2016\/07\/east-west-facing-solar.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2016\/07\/east-west-facing-solar.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2016\/07\/east-west-facing-solar.jpg?resize=700%2C400 2x"},"classes":[]},{"id":5450,"url":"https:\/\/www.solarquotes.com.au\/blog\/adding-solar-panels-existing-system-heres-need-know\/","url_meta":{"origin":1864,"position":2},"title":"Adding Solar Panels To Existing System? Here’s What You Need To Know.","author":"Finn Peacock","date":"March 24, 2016","format":false,"excerpt":"\u00a0 Please note: this post was written in 2016 ***Please read this 2022 post for the latest information on upgrading your solar panel array.*** So you've got solar panels on your roof and you want more so you can get your bills even lower? You are probably weighing up three\u2026","rel":"","context":"In "Solar Panels"","block_context":{"text":"Solar Panels","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-panels-2\/"},"img":{"alt_text":"solar panels with space for adding more","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2016\/03\/adding-solar-panels-to-existing-system.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2016\/03\/adding-solar-panels-to-existing-system.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2016\/03\/adding-solar-panels-to-existing-system.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":69353,"url":"https:\/\/www.solarquotes.com.au\/blog\/solar-panels-summer-test-mb2771\/","url_meta":{"origin":1864,"position":3},"title":"Solar Panels Vs. Summer Scorcher","author":"Michael Bloch","date":"December 29, 2022","format":false,"excerpt":"Things got pretty toasty here in Adelaide on Tuesday. Discover the impact it had on our solar power system's performance. Our system is comprised of just under 10kW of solar panels (9.96kW), an 8.2kW inverter and is export limited to 5kW. As it's reasonably new, I've been keeping fairly close\u2026","rel":"","context":"In "General Solar & Storage News"","block_context":{"text":"General Solar & Storage News","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-battery-news\/"},"img":{"alt_text":"Solar power system heat test","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2022\/12\/solar-summer-test.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2022\/12\/solar-summer-test.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2022\/12\/solar-summer-test.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2022\/12\/solar-summer-test.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2022\/12\/solar-summer-test.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":6765,"url":"https:\/\/www.solarquotes.com.au\/blog\/oversizing-solar-arrays\/","url_meta":{"origin":1864,"position":4},"title":"Why Oversizing Solar Panel Arrays Is A Smart Move","author":"Ronald Brakels","date":"August 9, 2016","format":false,"excerpt":"Installing rooftop solar systems with a total panel capacity greater than the\u00a0inverter capacity is usually\u00a0a very good idea. \u00a0It will certainly save you money, but it\u00a0can also help get around the restrictions many Australians face on the size of inverter they can connect to the grid. If you want to\u2026","rel":"","context":"In "Solar Inverters"","block_context":{"text":"Solar Inverters","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-inverters\/"},"img":{"alt_text":"house with lots of solar panels","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2016\/08\/ExtraPanels.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2016\/08\/ExtraPanels.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2016\/08\/ExtraPanels.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":23230,"url":"https:\/\/www.solarquotes.com.au\/blog\/budget-solar-buying-tips\/","url_meta":{"origin":1864,"position":5},"title":"Budget Solar: How To Save Money While Avoiding Disaster","author":"Ronald Brakels","date":"August 28, 2018","format":false,"excerpt":"I've covered a lot of ground in various articles I've written for the SolarQuotes blog.\u00a0 But one thing I've never delved deeply into is the fundamental nature of the human soul.\u00a0 Perhaps because at some level we fear the stark dichotomy that dwells inside us.\u00a0 Within every human being there\u2026","rel":"","context":"In "Solar Panels"","block_context":{"text":"Solar Panels","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-panels-2\/"},"img":{"alt_text":"How to buy solar power on a budget - tips","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/08\/budget-solar.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/08\/budget-solar.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/08\/budget-solar.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/08\/budget-solar.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/08\/budget-solar.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/1864","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\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/comments?post=1864"}],"version-history":[{"count":13,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/1864\/revisions"}],"predecessor-version":[{"id":9218,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/1864\/revisions\/9218"}],"wp:attachment":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/media?parent=1864"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/categories?post=1864"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/tags?post=1864"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}