{"id":98170,"date":"2026-03-09T06:06:59","date_gmt":"2026-03-08T20:36:59","guid":{"rendered":"https:\/\/www.solarquotes.com.au\/blog\/?p=98170"},"modified":"2026-03-10T09:24:31","modified_gmt":"2026-03-09T23:54:31","slug":"commercial-solar-when-its-brilliant-and-when-its-useless","status":"publish","type":"post","link":"https:\/\/www.solarquotes.com.au\/blog\/commercial-solar-when-its-brilliant-and-when-its-useless\/","title":{"rendered":"Commercial Solar: When It’s Brilliant And When It’s Useless"},"content":{"rendered":"

\"CommercialThis week I found myself involved in two commercial solar projects. One will almost certainly print money for decades. The other looked promising at first glance but fell apart the moment we climbed onto the roof.<\/p>\n

The contrast between the two was a useful reminder that, despite the current obsession with batteries and ‘three-free’ electricity plans, old-fashioned solar panels remain brutally effective for businesses.<\/p>\n

In many ways, businesses are still the cleanest use case for solar for 2 main reasons.<\/p>\n

Reason #1:<\/strong> Businesses, in contrast to homes, usually consume the most power when the sun is shining. Their demand tends to rise through the morning, peak in the early afternoon, and drop away overnight. Solar generation fits that profile beautifully.<\/p>\n

Reason #2:<\/strong> Once your meter is attached to a business entity, the 3-free hours plans all disappear. In fact – as far as I can tell – there aren’t even any small business tariffs that offer particularly cheap daytime rates. The best I found on Energy Made Easy was the Origin Business Sunshine Special at 28.6c per kWh from 10am-3pm. Unfortunately, an eye-watering 58c at all other times knocked it out of the reckoning.1<\/a><\/sup><\/p>\n

A Tale of Two Rooftops<\/h2>\n

The first project involved a large commercial property with multiple tenants: a brewery, a cafe, a boxing gym, laboratories, and several offices. Electricity for the entire building flows through a single NMI, with an embedded network and sub-metering used to allocate consumption to the individual tenants. Total usage is close to 1,000 kWh per day, and roughly eighty per cent of that occurs during daylight hours. In solar terms, that alignment is almost perfect.<\/p>\n

The solution was therefore obvious. The building has a large north-facing roof, so the plan was the longstanding SQ advice: “fill-yer-roof!”. The final design landed at 250 kW of Longi 650 W panels feeding a 110 kW Sungrow hybrid inverter plus an additional 50 kW inverter, with 100 kWh of battery storage added as a finishing touch. Even without claiming STCs for the solar – systems over 100 kW are not eligible – the numbers still work comfortably. The projected payback is just over four years.<\/p>\n

The landlord was happy to invest because the incentives are clear. She pays the grid electricity bill, on-charging the clients. Once the system has paid for itself the building will effectively have a large source of low-cost daytime power sitting on the roof. Some of those savings can be passed on to tenants while still improving the operating economics and value of the property.<\/p>\n

The second project could hardly have been more different. It was a small but extremely busy cafe\/restaurant in Adelaide CBD. Their electricity consumption is astonishing: around 165 kWh per day. That works out to the equivalent of a constant 7 kW load running twenty-four hours a day.<\/p>\n

What makes that figure even more surprising is that the kitchen itself is not heavily electric. Cooking is done with wood and gas, and cooling is mostly done with a large evaporative system. The building footprint is only about fifty square metres. Even so, the cafe’s electricity bill is roughly $6,000 per quarter, and the landlord was keen to install solar at their expense to give the tenants some relief.<\/p>\n

That all sounded promising until we inspected the roof.<\/p>\n

Unexpected Complications<\/h2>\n

It turned out to be a maze of penetrations. Fridge compressors, flues, evaporative cooling units, parapets, ducting and other obstacles covered almost every available section of space. After working around everything we could, the maximum system that could be installed without turning the job into a major building project was about 4.75 kW.<\/p>\n

A system that size would probably achieve around eighty per cent self-consumption and save about $2,000 per year. On the surface that still sounds reasonable. In reality, it barely dents the bill; it would offset less than ten per cent of their electricity costs.<\/p>\n

At that point the obvious question arises: why not install it anyway? A three-year payback is still attractive. Unfortunately, there is a complication.<\/p>\n

The cafe is currently on a mechanical meter and enjoys a relatively low flat electricity rate. Installing solar would mandate a smart meter upgrade, and that upgrade would move them onto a different tariff structure with a higher average energy price. Their usage would fall a little, but their electricity bill would increase.<\/p>\n

Adding a giant battery is pointless – because there is no cheap energy available to charge it.<\/p>\n

Where Is The Energy Being Used?<\/h2>\n

So what are their options? The first thing to do is look at their efficiency, and even that is hard. Because they don’t have a smart meter, their only insight into energy use comes from a quarterly electricity bill.<\/p>\n

So the sensible first step is proper measurement. Installing monitoring with 5 5-minute resolution across the main circuits would quickly reveal where the energy is going. In cafes the answer is often refrigeration: cool rooms, display fridges, under-bench units, ice machines and compressors that sit outside in the heat working harder than they should.<\/p>\n

One compressor on this particular roof is completely exposed, with its condenser coils visible from the street and no shading or protection at all. That alone could be responsible for wasting tens of kWh per day.<\/p>\n

Once we understand where the energy is being used, we can start to improve it, and also be prepared to optimise their tariff when they inevitably are finally forced onto a time of use plan.<\/p>\n

The two projects illustrate a simple point. Solar remains one of the best investments a business can make, but only when the fundamentals line up: a usable roof and substantial daytime consumption. When those ingredients are present, the results can be spectacular. When they are not, the smartest energy upgrade goes back to basics – good old-fashioned energy efficiency.<\/p>\n

Phase Shift is a weekly opinion column by SolarQuotes founder Finn Peacock. Subscribe to\u00a0SolarQuotes\u2019 free newsletter<\/a>\u00a0to get it emailed to your inbox each week along with our other home electrification coverage.\u00a0<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

This week I found myself involved in two commercial solar projects. One will almost certainly print money for decades. The other looked promising at first glance but fell apart the moment we climbed onto the roof.<\/p>\n","protected":false},"author":1,"featured_media":98174,"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":[683],"tags":[],"class_list":["post-98170","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-commercial-solar","entry"],"acf":[],"yoast_head":"\nCommercial Solar: When It's Brilliant And When It's Useless<\/title>\n<meta name=\"description\" content=\"I found myself involved in two commercial solar projects. One will print money for decades. 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I started SolarQuotes in 2009 and the SolarQuotes blog in 2013 with the belief that it\u2019s more important to be truthful and objective than popular. My last \"real job\" was working for the CSIRO in their renewable energy division. Since 2009, I\u2019ve helped over 800,000 Aussies get quotes for solar from installers I trust. 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In the midst of a state election where the shrill rhetoric is\u00a0matched only by the embarrassing speed of the election call, the level of antipathy has risen as the LNP seek to demolish the\u2026","rel":"","context":"In "Solar Policy"","block_context":{"text":"Solar Policy","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-policy\/"},"img":{"alt_text":"office in QLD with solar","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2015\/01\/commercial-solar-in-qld.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2015\/01\/commercial-solar-in-qld.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2015\/01\/commercial-solar-in-qld.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":2533,"url":"https:\/\/www.solarquotes.com.au\/blog\/commercial-solar-giving-insane-returns-for-small-business\/","url_meta":{"origin":98170,"position":1},"title":"The Shocking Truth About Commercial Solar","author":"Finn Peacock","date":"June 5, 2013","format":false,"excerpt":"OK, I admit it - \u00a0that was a headline designed to get your attention if you own or operate a small or medium sized business (I'm also a sucker for bad puns). But it's just that I feel the need to shout from the rooftops about the insane returns that\u2026","rel":"","context":"In "Solar Installation"","block_context":{"text":"Solar Installation","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-installation\/"},"img":{"alt_text":"solar install","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2013\/06\/sqhq-install2.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2013\/06\/sqhq-install2.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2013\/06\/sqhq-install2.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":29538,"url":"https:\/\/www.solarquotes.com.au\/blog\/redeployable-commercial-solar-mb1014\/","url_meta":{"origin":98170,"position":2},"title":"Redeployable Commercial Solar Gets ARENA Cash","author":"Michael Bloch","date":"April 15, 2019","format":false,"excerpt":"The Australian Renewable Energy Agency is supporting a project involving the installation of redeployable solar power systems on commercial and government buildings. While commercial solar power is a no-brainer business decision in many cases these days, some businesses are locked out of solar savings as they rent the premises in\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":"Solpod redeployable commercial solar","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/04\/solpod-commercial-solar-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/04\/solpod-commercial-solar-2.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/04\/solpod-commercial-solar-2.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/04\/solpod-commercial-solar-2.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/04\/solpod-commercial-solar-2.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":29427,"url":"https:\/\/www.solarquotes.com.au\/blog\/commercial-solar-writeoff-mb1006\/","url_meta":{"origin":98170,"position":3},"title":"Instant Asset Write-off For Commercial Solar Boosted","author":"Michael Bloch","date":"April 9, 2019","format":false,"excerpt":"The extension and expansion of Australia's instant asset write-off scheme could be of significant benefit to businesses considering installing solar power. The scheme enables businesses to immediately fully depreciate eligible asset purchases - including solar power systems[1. According to the ATO, a solar power system would usually be written off\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":"Commercial solar instant asset writeoff","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/04\/commercial-solar.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/04\/commercial-solar.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/04\/commercial-solar.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/04\/commercial-solar.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/04\/commercial-solar.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":72622,"url":"https:\/\/www.solarquotes.com.au\/blog\/business-solar-incentives-mb2869\/","url_meta":{"origin":98170,"position":4},"title":"Time to Act: Solar Incentive for Businesses Ends Soon","author":"Michael Bloch","date":"March 22, 2023","format":false,"excerpt":"It won't be long before the window of opportunity on a generous incentive for installing commercial solar closes. Small businesses should be talking to their accountants right now. The benefits of commercial solar systems large and small are only becoming more apparent, particularly with power prices skyrocketing and likely to\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":"Commercial solar incentives in Australia","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/03\/commercial-solar-incentives.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/03\/commercial-solar-incentives.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/03\/commercial-solar-incentives.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/03\/commercial-solar-incentives.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/03\/commercial-solar-incentives.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":24545,"url":"https:\/\/www.solarquotes.com.au\/blog\/commercial-solar-tax-writeoff-mb0760\/","url_meta":{"origin":98170,"position":5},"title":"Instant Asset Write-Off For Small Commercial Solar Still Available","author":"Michael Bloch","date":"September 26, 2018","format":false,"excerpt":"For small businesses considering solar energy, the Federal Government's instant asset write-off is back in effect and may be worthwhile taking advantage of while it's still available. One of the few positives to emerge from Budget 2018-19 with regard to renewables was the extension of a $20,000 instant asset write\u2011off\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":"Small scale commercial solar power in Australia","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/09\/commercial-solar-writeoff.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/09\/commercial-solar-writeoff.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/09\/commercial-solar-writeoff.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/09\/commercial-solar-writeoff.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/98170","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=98170"}],"version-history":[{"count":7,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/98170\/revisions"}],"predecessor-version":[{"id":98191,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/98170\/revisions\/98191"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/media\/98174"}],"wp:attachment":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/media?parent=98170"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/categories?post=98170"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/tags?post=98170"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}