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Adding a second battery — Tesla finally makes it possible
When Lightning Energy installed our Powerwall 2 back in December 2023 https://www.facebook.com/share/p/1Anc2vKKqZ/ it was great. Paired with our 13 kW Enphase/Jinko solar system and 10 kW inverter, it's been handling our fully electrified home in Emerald pretty well — five reverse-cycle ACs, heat pump hot water, EV charging, and grid outages lasting up to nine days. But as we've added more loads, I've been thinking about expanding battery storage. There was a problem, though. The Powerwall 2 is no longer CEC-approved for new installations in Australia. Tesla stopped taking orders for it in late 2024/early 2025, and as of January 2026 it's no longer on the Clean Energy Council approved list. So you can't add a second one. And until very recently, the Powerwall 3 — Tesla's current model — was completely incompatible with the Powerwall 2. They couldn't talk to each other. That meant anyone with a Powerwall 2 who wanted more storage faced a painful choice: rip out the existing battery and…
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Heat pump testing — how fast does it heat?
In my December post about our heat pump installation, I mentioned that one of the reasons I chose Emerald was the integrated app. It shows the tank capacity, water temperature, outdoor temperature, and lets me turn it on and off or activate Boost Mode remotely. I've since used it to answer a question: how long does it actually take to heat the water, and does outdoor temperature make a difference? Over the past couple of months, I've been taking semi-random screenshots of the Emerald app at intervals through the day, tracking the water temperature as it heats from "Low" (around 25–30°C) up to the 60°C target. I did this on 11 different days, with outdoor temperatures ranging from about 14°C to 32°C. I then used AI (Claude, by Anthropic) to read all 87 screenshots, extract the data, and plot it on a chart. The chart shows each day's heating curve overlaid, with the lines colour-coded by outdoor temperature — red for hot days, blue for cool days. We might expect to see the warmer days…
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Goodbye gas! I finally organised disconnecting the ducted gas heating at our home.
If only we could see the burnt gas pouring into the air, all the time, and not just when the condensation highlights it (as in the photos). Pumping carcinogens and greenhouse gases into the air that we breathe. It’s nuts. It was costing us up to $528 per month to run the heating in winter. Our replacement air conditioning will be closer to free, thanks to our solar and battery. We recently also replaced our gas hot water with a heat pump. See my post about that, here: https://www.facebook.com/share/p/17xtnGjv2E/ Our one remaining gas appliance is our stove top. Once that’s gone, we will save $35 per month just for the connection fee. And no more gas! We’re replacing the gas heating with some split air conditioners. Read about our replacement system here: https://www.facebook.com/share/p/18cxsd3qG7/ Follow Tesla Tripping to stay tuned. For those who might say “what about in a blackout”? Note the power point connection on the old gas heating. Our old gas hot water heat pump had one too.…
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What to ask for, in a battery installation?
I suggest getting your installer to agree in writing that your battery installation will include: 1. Remote control via an app and/or website to monitor your battery and house power. 2. During a grid outage, the battery should provide backup for everything you need. 3. During a grid outage, solar continues to provide power. 4. The ability to curtail export of power to the grid when pricing is negative. 5. Compatibility with Amber Electric, if you might want to use them as your energy retailer. Let’s look at each in detail: 1. Using an app or website, you can: 1. Monitor power in and out of your battery, house and grid connection, instantaneous, daily and historical. 2. At any time, set your battery to a minimum charge percentage. 2. In the event of a grid outage: 1. The battery will switch over automatically. The installer should test it and show you. 2. The battery will power all of your home, up to the battery’s maximum power (which should be at least 5kW). 3. If you have three…
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While driving in our town of Emerald to get some Emerald Thai for dinner, I did a double…
…take when I saw a Savic Motorcycles sign, randomly on the footpath. It turns out that they were running test rides today “winding through the beautiful Dandenong Ranges”. What a great idea! Test drives at dealerships and even EV shows tend to be within urban sprawls, which doesn’t offer much of a driving or riding experience. We’ve seen Savic at a few EV shows, including the recent Everything Electric in Melbourne (pictured). I wish I had known it was on, and that we weren’t recovering from a cold right now. Hopefully next time. Savic is an Australian company building electric motorcycles.
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A few neighbours and friends have asked us lately for advice about solar panels, house…
…battery, EVs etc. Here’s our real life experience, starting a series of posts on different topics. We installed solar and battery when we moved into our house (Emerald, Victoria) about two years ago. We already had an EV (electric car). This week, we finally got around to replacing our gas hot water with an electric heat pump. Next month we’re replacing our gas ducted heating with a multi head split air conditioning system. Overall, our solar and battery provide more electricity than we use. We’re also connected to the electricity grid so we can import when we need more, or export when we have a surplus. We aim to produce all the power that we need. On the rare times that we import electricity from the grid, our retailer bills us. More often, we export our surplus electricity to the grid, for which they give us a credit. Overall, we have more credit than debits, so we don’t have to pay anything. All this depends on your electricity plan, which I’ll discuss in a separate post. The…
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Heat pump installation
We finally got around to installing a hot water heat pump, to replace our gas hot water system. We were paying about $40 per month for our instant gas hot water (plus $40 connection fee). Now we’re paying nothing, because the heat pump is just using our excess solar power. Without solar, I estimate it would be costing us $8 per month to power it from the electricity grid. There are a few incentive schemes around to replace gas (or other old inefficient systems) with a heat pump. An installer will factor these into their quote. The subsidies can be significant. In our case, the total price was $4480, but it was reduced to $1650 for us to pay, after subsidies were subtracted. A hot water heat pump uses the same principle as an air conditioner (which is also a heat pump). It “pumps” heat from one side to the other. In this case, it pumps heat from the outside air into the tank of water. The basic physics is that when you compress air in a confined space, it gets hot, and when you expand…
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Final day at Everything Electric Melbourne, starting and ending with Jack Scarlett.
Test drives, a panel talk about road tripping, EV conversions, and a flux capacitor, some of the highlights.
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Some random shots from Everything Electric Melbourne today.
After a few years in Sydney, this is their first showing in Melbourne. It’s noticeably smaller, but understandable for the first appearance. Interesting panel talks. Informative staff at product booths. Huge variety of test drives available, including self driving Tesla cars. A few food truck offerings. They need more undercover seating (from sun or rain). We recommend the falafel wraps.
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Back in January, we took the plunge and ordered a new Tesla Model Y “Juniper” launch…
…edition. “Ultra Red”, white interior, 20” wheels (which was the only option for the launch edition). We chose the same battery and drive as our Model 3: RWD (rear wheel drive), LFP battery (no nickel or cobalt), 0 to 100km/h in 5.9s. The main reason for the upgrade is for the greater ease of getting in and out of the car, which has been increasingly painful on Fran’s arthritic hips. As those of you who follow our Tesla Tripping blog will know, we have looked at and test driven quite a lot of other options. The best contender was the XPeng G6. In the end we stuck with the Tesla Model Y because of the huge storage space, driving performance and the tech. The Tesla app has guided us through the whole process up to now, with registration, trade-in, insurance. Today is delivery day. The final `Start` button is still disabled in the app. I’m guessing it will enable at exactly 3pm, when we’re at Tesla Mulgrave. We are trading in our Tesla Model 3, after driving 91,000 km in 2.7 years (plus…
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Feb 1: Test drive of a Kia EV6.
Forgive the dust in the photos. Highlights, comparing to Tesla Model Y: - Good acceleration. Handles okay. - More physical buttons (good or bad, depending on preference). - Manual, not auto, adjusting steering column. - Much less storage. - Smaller main screen. Blind spot camera is on an additional smaller screen, behind the steering wheel … in a blind spot! At least, I couldn’t get a good view of it, which defeats the purpose. - HUD (heads up display) was a new discovery for me. It’s terrific to see your speed within the field of view of the windscreen. - 240V V2L outlet in the car, which is great. Apple Car Play. Missing in a Tesla.
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Our first (and only) test drive of the new Tesla Model Y “Juniper”, at Tesla Mulgrave.
We only had 25 minutes in the car, which isn’t much to fully test it. Not enough time to drive to some winding country roads, but we did manage to find a tightly curved on-ramp to a highway. Driving at speed around it, we definitely noticed more body roll compared to our sportier Model 3. This did freak out my passengers. They also found the acceleration more noticeable in the back seat, which seems to tilt down. Tim described the acceleration as prolapsing his sphincter. The Model Y absorbs bumps much better, finding a good median between sport and comfort. This new model has the same acceleration as our Model 3, 0 to 100km/h in 6s., one second faster than the previous Model Y. This is the RWD (rear wheel drive) model, standard range, not the AWD long range. We prefer the RWD because it has an LFP battery, which has no nickel or cobalt, and a longer life span. It’s also cheaper. But slower acceleration and less range. We booked the test drive online, following the instructions to…
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The NRMA Airlie Beach Holiday Park is a shining light.
EV destination chargers at each of the new cabins. Fast chargers out front for the public. Efficient electric hot water heat pumps. On site cafe and coffee. E-bikes. Walk to nearby Coles and shopping center. This is the future. Well done, The NRMA! Missing our own EV right now, still parked back in Melbourne airport.
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We took another test drive of an XPENG G6, this time from a new dealership in Berwick…
…Victoria, which is closer to us. Nice interior, comfy seats, great tech. The handling wasn’t bad on some windy roads, but not as sporty as the Tesla Model Y. Disappointing storage. The auto driving hesitated quite a bit around bends. The lack of full stop on one pedal driving is annoying, but they will reportedly solve that in a few weeks via an OTA (over the air) software update. The G6 includes auto parking and lane change, which costs extra in a Tesla. It has vehicle to load, but it requires some adapter plug into the external charge port, which wasn’t available. We had a chance to play with Apple CarPlay, which is great to have. But the XPeng doesn't seem to support pinch and zoom in Apple Maps, which makes it very limited. Acceleration was terrible (doesn’t move for a second), until I turned in “launch mode”. I couldn’t figure out how to enable launch mode and regenerative braking (x-pedal) at the same time, which was annoying. Later that day, we happened to watch a YouTube…
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The Xpeng G6 is a strong competition against the Tesla Model Y.
We viewed both at The Everything Electric Show (Fully Charged Show) in Sydney. A few weeks earlier, we took a G6 for a test drive at the XPENG Port Melbourne showroom (also pictured). The Xpeng G6 and Tesla Model Y both have great tech, great efficiency, ventilated and heated front seats. The G6 doesn’t have frunk storage, has small subtrunk storage, smaller boot, no glovebox, but has a bit more rear passenger room and probably more comfy seats. It has Apple Maps and Vehicle to Load (V2L). It is $10k cheaper, but requires paid regular servicing and and has longer warranty. It includes auto lane change (extra purchase on the Tesla). The Tesla has faster acceleration, sportier handling, one pedal driving comes to a full stop without the brake, and has more fast charging options. It has a screen for rear passengers and powered rear seat folding. It has much more storage overall, including huge sub trunk, boot and frunk. It has a better sound system, even though it has slightly less…
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Ioniq 5 test drive. Sporty handling and acceleration.
Nice interior. More physical buttons than Tesla (which may be good or bad). Felt smaller on the inside. At slightly higher cost than a Tesla Model Y, it seemed to be less value.
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Continuing our look at EV options.
The Hyundai Kona. Good price. Small. But they somehow manage to fit it a spare wheel. We didn’t test drive it.
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Many electric vehicles at the Off-Grid Living Festival this weekend, in the Border…
…Regional Electrification Events area. New cars from Tesla, MG, Hyundai and others. Test drives on site. We spotted a few converted cars including a VW Beatle and a Mini. A Zero motorcycle. Dozens of electric mowers from small to huge. The place of huge!
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Our first delivery to our new house – a congrats savoury box from The Hamper Emporium…
…from Mortgage Choice in Tumbi Umbi. Thank you John and Amanda. What a nice surprise 😋 . John sorted out the loan for our previous house in Saratoga NSW, and now this one in Emerald Victoria. It’s been a long road, figuratively and literally. We packed up and left our old home on December 1 last year. We’ve been road tripping most of the time since then, and hope to finally move into our new home in a couple of weeks. We didn’t intend to take that long to find a new house. Our “pre approved” home loan with ING turned out to require additional financial info, which was difficult to do while we were on the road. I recall voicing our frustrations over the phone while driving through some country road out the back of nowhere. In any case, that pre approval expired after six months and banks started limiting new pre approvals to just three months. I’m not sure how they expected buyers to find a home in such a short time. In the end, we tried to get a loan through Suncorp, due to their good…
Formerly: Tesla Tripping
Come along on our EV road trips around Australia and Europe, and follow as we progressively electrify our home in Emerald, Victoria.
Join us on the road. We set off in late 2022 and drove eastern Australia in our Tesla Model 3 — Sydney, Dubbo, Armidale, Brisbane, Cape Tribulation, then down through Queensland and back. We've since upgraded to a Model Y.
We've kept exploring — Uluru, the Snowy Mountains and Gippsland, and a longer run through Europe in 2024. There's plenty more on the map, so come along for the next leg.
At home in Emerald, in Victoria's Dandenong Ranges, we're progressively electrifying everything: rooftop solar, a home battery, a hot water heat pump, air conditioned heating and cooling, and EV charging straight from the sun. We're going fully electric, off the gas.
Got questions, or insights of your own? We'd love to hear them — please drop a comment on any post.