A Tesla Powerwall with my rooftop solar? I'll take SIX

A Tesla Powerwall with my rooftop solar? I’ll take SIX

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A Gold Coast home owner has installed six Tesla Powerwall batteries, to store 98% of the generation from his 24kW rooftop solar system. And the payback? Not bad…

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One Step Off The Grid

A home on Queensland’s Gold Coast has installed what is believed to be the largest residential Tesla battery storage system in Australia – and one of the biggest in the world – with a total of six 6.4kWh lithium-ion Powerwall units hooked up to store the solar generation from a massive 24kW rooftop solar PV system.



The impressive home solar and storage system – the six Powerwalls (pictured above) have a combined capacity of 38.4kWh and the solar system generates 36,355kWh a year – was installed from scratch by Natural Solar, and will allow the home owner, Clayton Lyndon, and his family to store and use 98 per cent of the solar they generate.

Why? We asked Natural Solar’s managing director Chris Williams that very question. Here’s what he said…

“What we’re seeing here is typifying the greater consumer awareness and excitement around battery storage,” Williams told One Step Off The Grid in an interview on Friday.

“Customers are avoiding reliance on the grid and creating greater flexibility of when and how they use power. We’ve seen that translate into hundreds of (battery storage) installations around the country.

But excitement and grid independence aside, Williams reckons the return on investment for Lyndon’s system is actually looking pretty good.



“By scaling the system up, the price per kW is actually very attractive,” he said. “By consuming the entire production of solar system, he’s looking at anywhere between 5-6 years ROI.

“Total production a year is astronomical, so that’s obviously a huge production across the year; a very high quality system performing very efficiently.”

Williams says that since his company outed itself as one of the first certified reseller of Tesla Powerwall units last year, he has already seen a shift in consumer attitude to battery storage.

“When Natural Solar announced becoming a Tesla reseller we had an immediate uptake and large amount of volumes coming through,” he said. “But most customers wouldn’t go bigger than one battery, maybe two.

“Gradually, by around about the second quarter of this year, two batteries became very normal. Now, two and three and four batteries are a very common system.

“I firmly believe 2016 will be seen as a really pivotal year in the industry, with the move from solar alone to integrated home energy management systems,” he said.

Williams says the mix of people who are installing solar and storage from scratch, or who are adding storage to an existing PV system, or upgrading their solar and then adding storage, was pretty evenly distributed.

But Gold Coast customer, Lyndon, went straight for 6 power walls, he said – one system installed all at once, including three separate 8kW PV arrays on the roof and a bidirectional meter controlling the smarts. IMG_6892-e1473387803842

“It was a a bit of a feat of engineering by our team, but it only took three days.

More time was taken pre-installation, he said, with the home owner going through “a very long process” with one of Natural Solar’s engineers to ascertain what the most effective and attractive system would be for him.

As far as Williams is concerned, they got this part “spot on” – “a self-consumption of 98 per cent is perfect,” he said.

“The expectation is this customer will be able to save more than $13,000 per year on energy bills should he fully utilise all of the power generated from the panels, and that is stored within the Tesla Powerwalls,” he said in a statement.

Full Tesla Powerwall and solar panel solutions from Natural Solar start from $13,590.

This article was originally published on RE sister site One Step Off The Grid. To sign up for the weekly newsletter, click here.

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  1. Brunel 4 years ago

    I wish yellow and purple Powerwalls were sold!

    Even some Ferraris are colored yellow.

    • nakedChimp 4 years ago

      Just take off the panel and talk to the paint shop of your choice?

      • Brunel 4 years ago

        I doubt they would do a good job.

        There are plenty of yellow Ferraris out there. Surprising that a yellow Powerwall is not made.

  2. aggri1 4 years ago

    Must be hydroponics. That’s the only thing I can think of. 24kW array in Qld and he expects to be using most of the energy? Not to mention, he can afford six Powerwalls. Must be hydroponics…

    • karLcx 4 years ago

      running air conditioning 24/7 on a ten bedroom mcmansion is my bet.

  3. JeffJL 4 years ago

    He could have a greater ROI by reducing his power usage. Just saying.

    • karLcx 4 years ago

      people with more money than sense never reduce anything.

  4. orko138 4 years ago

    He’s going to save $13k a year on power bills? How much does he usually spend on power?

    • nakedChimp 4 years ago

      I guess around 100kWh per day roughly for that kind of saving.

      • Stewart Rogers 4 years ago

        That doesn’t add up. I use around 80 kWh per day in my home. I pay roughly $4200 per year on electricity as you get decent rates when you use more power.

        • nakedChimp 4 years ago

          I use about 20kWh per day in FNQ with Ergon and was just extrapolating. Didn’t take rebates into account though..

  5. David Kearns 4 years ago

    Is this household running a smelter out the back? That’s an enormous electricity consumption.

    • Ren Stimpy 4 years ago

      Nah, one of the kids is working on his school science project which he calls the Small Hadron Collider.

  6. Kenshō 4 years ago

    I’m still a traditional fan of the battery racks in a standing cabinet, looking like a fridge. Not nearly as attractive, though doesn’t use this amount of wall space, potentially using modular components so battery monitor, BMS and batteries can all be easily slid out and replaced. I’d rather Tesla focused upon a smaller version of the Powerpack designed to be cycled for home use… a big boring low tech non-liquid cooled fridge shaped cabinet… Cheap and functional minus frills.

  7. Kenshō 4 years ago

    Tesla Powerpack, looks modular, sits on the ground. More normal looking.

  8. Kenshō 4 years ago

    Humanity needs an industry standard for residential and small business applications and the Powerwall definitely is not going to be it. I’m not suggesting a battery need be big, mean and ugly, though it’s not to primarily whisper sweet nothings in our ears. It has to pack a punch if our grid goes down. This pic below is old style Uninterruptible Power Supplies (UPS). They are designed to be modular, so the batteries are the same size throughout the manufacturers different sized models. When the time arrives, the batteries can be slid out and replaced. The reason for the modular design, is the technician needs to be able to fault find the device and where possible, quickly and easily replace bits like a battery monitor or the Battery Management System (BMS). The reason is its a power supply. It needs to be done quickly and easily not require a forklift.

    • Geoff 4 years ago

      I suspect going forward that we’ll see battery node clustering.

      • Kenshō 4 years ago

        Never heard of this? Looking on net, Is this sensors on batteries having a role on which battery bank gets charged/discharged? Wouldn’t that require inverter/chargers in constant wireless or wired communication? Are these clusters of nodes envisaged as primarily onsite? So is it some sort of way for balancing a set of battery banks to all take a fair share of the sites load relative to their current kWh capacity and applicable D.O.D.? If so are there any prototypes?

  9. Kenshō 4 years ago

    There is a tradesperson in-between an electrical engineer who has a four year degree and an electrician with two years of theory in their apprenticeship. It’s an electronics technician which is the only trade we have in society with three years of theory. Lets not make it hard for them. I used to be one. It is so much easier when a system has a modular architectural design. It’s like the difference between a laptop and a computer. A laptop gets thrown away whereas a computer is more likely to have components and boards replaced. I used to work in big communications systems e.g. high power HF transmitter stations for the military. Everything has a modular design. The system has to be able to be easily tested, repaired and brought back online.

  10. GregX 4 years ago

    I think it is fantastic what this household has done. If all of us could be totally responsible for 98% of our renewable electricity requirements then this would go a long way to solving the problems with climate change. This is especially important in this case with this household being such a large consumer. Hopefully this becomes a trend or status symbol and really takes of with all similar high residential electricity users. Tesla make it all the more easier with such cool looking batteries. I hope the garage in the picture is filled with BEV’s when in use to complete the package. Two or three BEV’s on high daily use could well explain the high expected electricity usage.

    • Kenshō 4 years ago

      A person charging 3x EV’s would not buy a set of 6kWh house batteries. Especially one that’s not expandable other than finding more wall space.

      • GregX 4 years ago

        Why not?

        • Kenshō 4 years ago

          The article above says the fellow is using this 6x Powerwalls to power the house and there’s an emerging consensus the car battery often needs to be bigger than the house battery. A car battery can be 90kWh so for the amount of cars that could fit in this fellows garage, it looks like he’s going to run out of wall space.

          • GregX 4 years ago

            Fair enough. Maybe they have a pair of LEAF’s for now. The Powerpack is awesome. In any case it is still a major commitment to renewable energy which is even more awesome.

          • Kenshō 4 years ago

            The 100kWh Powerpack is US $47k though maybe some residences will install it or something like it. It would avoid all that wiring all over the wall.

  11. Kenshō 4 years ago

    Wall mount batteries should only ever be installed in tight locations. Most garages are better off with a battery rack.

  12. Miles Harding 4 years ago

    Like several commenters here, I’m going to give this project a fail.

    It fails for using technology to solve a social problem; that of excessive consumption.

  13. Le Clair 4 years ago

    Absolutely tremendous, looks great and shows what can be done. One thing though, I wonder if the proud new owner is aware that if the grid goes down, both the solar and the Tesla Powerwalls will stop working too?

    • Kenshō 4 years ago

      On Natural Solar’s website it says:

      “During an outage, will one be able to use both PV and the Tesla Powerwall?

      Yes, the Tesla Powerwall can enable PV to continue operating during an outage as long as it paired with a compatible inverter capable of islanding. The PV will supply loads during day time and any excess energy will be stored in the Tesla Powerwall. When PV is not producing power, the Tesla Powerwall will provide power to the household loads.”

  14. Analitik 4 years ago

    I wish pfitzy would comment but here is his calculation on likely payback. Summary – not worthwhile at current costs.


    24 kW of panels and that big garage/basement housing the 6 PowerWalls points to one helluva MacMansion.

  15. Phil 4 years ago

    I cant wait till January to March 2017 when in NSW those on the 60c a kwh gross metering solar contribution don’t bother to ditch the smart meter option if they choose net metering. With Time of Use billing features (T.O.U)

    If the whole family works and consumes in peak periods bills of $1500 TO $3000 will be the norm.

    Coming off a low bill base the bill shock may even cause some consumer bleating.

    Now if they can add Peak use metering as well ( on top of T.O.U) and charge 60 cents plus a kwh then that’s the time to buy energy shares.

  16. Susan Kraemer 4 years ago

    Wow, a $13,000 electricity bill for a home? How is that possible? He has to be running a home business of some kind? Heavy machinery running all day?

    Would have been enlightening to know why his use was so profligate.

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