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…

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…

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.…

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…

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.

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…

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…

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.

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.

About $25k for a new BYD Atto 1.

Wow. EVs are now approaching the price of comparative ICE vehicles. Unfortunately, BYD couldn’t get their Atto 1 prepped in time for the show, but they did have the Atto 2 on the floor (pictured). At Everything Electric Melbourne.

Checking out the Farizon electric van, decked out as a camper.

Also the popular BYD Shark electric ute (plus hybrid range extender), and some towing options. At Everything Electric Melbourne.

Nice interior of the Geely EV, at Everything Electric Melbourne.

So many EV options available now.

Dancing, flipping, rolling cat robot at Everything Electric Melbourne was a crowd pleaser.

No litter box!

Nice to see some services (like Goodbye Gas) available to help homes get off has…

…upgrading to electric. Better for health, monthly bills, and clean air. At Everything Electric, Melbourne.

Some of the many scooters, motorbikes and e-bikes at Everything Electric Melbourne.

A couple of electric police cars at Everything Electric Melbourne.

A Tesla Model X and Kia EV6, I think.

Big wheels keep on turnin’, electrically!

Trying out a big rig at Everything Electric show Melbourne

Rest stop at Lake Nillahcootie, near Bonnie Doon.

On our way back home from the Off-Grid Living Festival and Corowa, crossing back over the border into Victoria. To our pleasant surprise, coffee and toasties were on offer from the Kalari Kafe van in the car park by the lake. Unfortunately, the generators powering the van filled the area with noise and some fumes. Hopefully V2L EVs will soon become so common place and accessible that more food vans will be able to use them. Charging: Two days ago, we drove our EV, fully charged from solar, from home in Emerald, Victoria to a B&B in Corowa, NSW. While parked at our accommodation, we charged up from a standard power point, before driving home today. About 700km in total, with no visits to charging stations required.

Strolling around the Off-Grid Living Festival today, in Chiltern, Victoria.

Such a wide range of exhibitors. Excellent food options, but very little shade. Lots of dust, which destroyed the car wash we did a couple of days ago. Very thankful for a smoothie from the Barefoot Blender. Most of the site seems to be powered from solar, or from V2L EVs. Great to see. Less smelly and noisy generators. Even the security motorbikes are electric. Nice!

Any power point is a charging station.

We drove from eastern Melbourne, Victoria, north to just over the border in Corowa, NSW. We can walk down the road and see Victoria on the other side of the Murray River. We were in Queensland earlier this week 🤪. We’re staying at an Airbnb house for a couple of days, while we attend the Off-Grid Living Festival in Chiltern, tomorrow. Charging: We charged up the car at home from solar, for free. We drove all the way without charging, arriving with 11% charge remaining. We plugged into a power point at our accommodation (yes, we checked first with our host), which brought the tank up to 76%, more than enough for our day trip to the festival the next morning. We could have charged at several fast chargers along our route, but since we didn’t need to stop for any other reason, we just drove on and charged at our destination. So many options.

Road tripping through Europe gave us a glimpse into the future of EVs and road trips in…

…Australia. Border Regional Electrification Events invited us to talk about it in the Electrification Tent at the Off-Grid Living Festival, in Chiltern, Victoria (30 minutes from the NSW border). The audience asked some excellent questions. Thanks to all those who attended. Some of the slides from our talk, included here.

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.

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…

We spotted a few utes and trucks at the Everything Electric Show (Fully Charged Show), in…

…Sydney. Some conversions, some plug in hybrid (PHEV), and one large battery swap unit for a semi, in just 3 minutes. We sat in the huge frunk of the F150 Lightning, made possible because no engine is needed. Some electric utes have been popular for mining operations, so as not to poison the air in the shafts, and to avoid the need to truck in fuel to remote sites. On the way out, we spotted a BYD Shark (PHEV) parked at a fast charger on the street. Frustratingly, they hadn’t plugged in. There were a couple of parking cops who were hopefully about to post an infringement notice. Chargers are for charging, not just parking 🤦‍♂️.

Checking out electric vans at Everything Electric (from Fully Charged Show), in Sydney.

At The Everything Electric Show in Sydney (by the Fully Charged Show), checking out the…

…Tesla Cybertruck. Impressive, but ridiculously big, like most oversized utes.

The Everything Electric Show (Fully Charged Show) wrapped up in Sydney for another year…

…but will be back, for the first time, in Melbourne in November. In the car park, we walked past four guys standing around the open bonnet of a V8 ute, saying “we should have gone electric”. Very fitting end. Amber showed off her Tesla Tripping tote bag, as we said goodbye. 3000km done and 1000km to go. Car fully packed again, with the addition of four old computers we had left behind when we moved from the Central Coast, two years ago. One of the sharp iMacs showed its abandonment issues by cutting my bare foot. Next stop, for dinner, in Campbelltown. We shared a roast and dessert. Then on to Mittagong for tonight’s accommodation, booked at the last minute, as usual. Charging: Fully charged at the Superchargers in Campbelltown while we ate dinner. Well, by the time our order came, so I had to move the car. We didn't need to charge yet, but it's quick and easy to top up whenever we are parked anyway.

A few of the electric converted vehicles at The Everything Electric (Fully Charged Show)…

…in Sydney.

Just a few of the electric motorbikes at The Everything Electric Show (Fully Charged…

…Show) in Sydney. Including locally built Savic Motorcycles.

Portable power. A few V2L (vehicle to load) examples at The Everything Electric Show…

…(Fully Charged Show). Including an EV DJ, coffee machine, large TV, and power tools. Most EVs now include V2L, so you can plug just about any household appliance into your car, and power it without running an engine, so no heat, exhaust and noise. Tesla, however, does not currently offer this feature, except on the Cybertruck. Very disappointing.

Great to see some innovative new EV designs at Everything Electric (Fully Charged Show)…

…in Sydney. This Deepal E07 has a hatch that’s kind of like a small ute tray. Full cabin plus a tray/boot. Opens electronically. You can even extend the tray length by folding down the rear seats (unlike the Cybertruck). Australian pricing and release expected at the next exhibition, I think in April.

Checking out the new 2025 Tesla Model Y “Juniper”. Eas

ier for passengers to get in and out, compared to our lower Model 3. Love the ventilated seats. So much room in this thing, more than any other competitor vehicle, it seems. And the most efficient. I’ve added photos of Phil lying down in the back of another Tesla Model Y (not Juniper), on a Tesla mattress, to show how much space there is with the seats down Still no vehicle to load (V2L) or Apple Car Play, like most competitors have. At Everything Electric (Fully Charged Show), in Sydney.

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…

Great memories, spending some time with family on the NSW Central Coast.

Tomorrow: Off to Everything Electric (by Fully Charged Show), in Sydney.

A couple of visits to Erina Fair, while we’ve been staying nearby, this week.

Pineapple fried rice at Thai Thyme. Teriyaki pizza at GPK. Tomorrow we’re off to the Fully Charged Everything Electric Show in Sydney. Charging: Erina Fair has had a couple of Tesla destination chargers for years. And for years they have been the only public chargers around, so are almost always busy. We did get lucky on Monday night, when we first arrived, to top up to full. It’s still relatively difficult to park there, but the car park entrance, around several obstacles. Plugshare shows since fast chargers “coming soon” nearby, but they have been months in progress. Twelve new Tesla Superchargers have sprung up in West Gosford, which is great.

We stopped by “The Big Shovel” as we left the Off-Grid Living Festival in Chiltern. Fra

ncis tried to make a friend out of a skittish young bull. We finished up back in Yack, this time at the ”Bottom Pub”, complete with appropriate (or inappropriate) photo.

Some of the slides from our presentation on EV road tripping at the Off-Grid Living…

…Festival, in the Border Regional Electrification Events electrification tent.

Great vibe at the Off-Grid Living Festival.

Street musician and entertainers, cuddly animals, amazing artwork, lots of delicious food options. No disposable plates! Impressive.

On our way out from the Off-Grid Living Festival, we checked out some of the displays in…

…the Border Regional Electrification Events area. We had a chat with Paul about the Husqvana robot mower that was quietly cutting a patch of lawn next to us. All Seasons Garden Solutions: https://www.facebook.com/profile.php?id=100091464130556 We chatted with Matt from Clenergy about a possible portable battery for camping, which can charge from the Tesla car’s 12V supply and from portable solar panels, to then use it for high power cooking such as induction stove tops. It pains me that this is needed because our Tesla doesn’t have vehicle to load (V2L) which could power the stove directly. Other EVs have this feature.

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!

We arrived at Off-Grid Living Festival at about 2:30, to catch a few of the talks in the…

…Border Regional Electrification Events electrification tent. We caught the tail end of a panel discussion of EV owners answering some audience questions, then Michael from the Electric Vehicle Council covering a range of issues. And finally an eye opening discussion on recycling measures in place for lithium batteries in Australia. The tent was appropriately powered by V2L (vehicle to load) from the MG EV parked next to it. We found our names in the presenters list for tomorrow! See you at noon.

Battery powered coffee at the Off-Grid Living Festival.

No diesel generator noise or fumes. How’s the serenity!

First stop, in Yea, on our way to the Off-Grid Living Festival.

We stopped for lunch at Marmalades – delicious fritters and a cheese waffle dish, which was new for us. Charging: We plugged in at the Tesla Supercharger behind the shops. Very convenient location. By the time we ordered, the car was already charged enough to continue our trip. But we filled our stomachs and allowed the car to fill its battery.

So many different modes of transport at Fully Charged Show’s Everything Electric, Sydney.

Our second day at Fully Charged Show’s Everything Electric Australia 2024. W

e checked out Tiny Solar Homes, Bosh Cooking, many vehicles (see previous post) and a few more panel discussions. I am particularly interested in Vehicle to Everything, but hampered until Tesla enables it on their cars, like BYD, Ionic, MG and others already have. I briefly ran into Chris Bowen MP (walking with Robert Llewellyn's and Dan Caesar). I asked him to stop subsidising fossil fuel companies. “One thing at a time, mate” was his response. I am very glad that he has finally brought in vehicle emissions standards and other positive steps. But stopping tax payer funding of fossil fuel companies, which are killing us, seems like a much bigger impact. No reason for us to wait to do that. The planet can’t wait, for sure. +1.5°C and still climbing 😢.

Wrapping up our first day at Fully Charged Show’s Everything Electric Sydney. G

uest panelist for Evie Networks discussing better public charging. Attended several panel discussions in the Giga Theatre and Mega Theatre. Spotted a few solar race cars. I grilled the team at the Enphase Energy stand on how I can turn off my solar production remotely. No satisfactory answer yet, so I’ll be back to grill them tomorrow. We asked the fire warden how many EV fires have occurred here so far. He said “zero” in sign, in the photo. Unsurprising since there have only been six EV fires in Australia (ever), none of them while charging. Finished off laughing, watching Jack Scarlett and Imogen Bhogal, from Fully Charged Show, cooking Pad Thai on an induction stove. Hosted by Zoe Bingley-Pullin (previously hosted Good Chef, Bad Chef). Back again tomorrow.

Arrived at Fully Charged Show’s Everything Electric Sydney, just in time for a vegan pie…

…and a quick view of some of the exhibits. Have to eat quickly before we’re on the panel with Evie Networks to discuss how to improve EV charging.

After a long drive from Bright, through Yackandandah and Yass, we arrived in Berry…

…checked into the Berry View Motel, then drove around the corner to the Berry Bowling Club for dinner. A ute parked adjacent to us in the motel car park illustrates that some vehicles are just too big for current car parking. We had to reverse in at an angle to avoid scraping along the ute’s towball. Next morning, we popped into the local IV Coffee outlet, appropriately adorned with ivy. Then onward to the Fully Charged Show Everything Electric expo in Sydney. Charging: Since we were parking at the Berry Bowling Club for dinner anyway, we plugged into The NRMA fast charger on site. This would normally take about ten seconds, but the NRMA app had forgotten my credit card details, so I had to re-enter them. It also had some user interface oddities that prolonged the experience. Much of the app appears in web portals, which is not a coherent experience. I’d love to make a better app for them, specifically for EV charging.

Today we drove along the Great Alpine Road from Bairnsdale in Gippsland Victoria, through…

…Mount Hotham and various lookouts pointing at the highest places in Australia, including Mount Kosciusko. Unsurprisingly, The Great Alpine Road is the highest highway in Australia. Stunning scenery, on top of the world. We’re on our way to Fully Charged Show’s Everything Electric show in Sydney, and to catch up with family in NSW. Charging: From Mount Hotham down to Bright was about 55km, but we only used 1% battery, because the downhill run actually charges the battery (and doesn’t wear out the brake pads).

Setting of from Emerald Victoria to Fully Charged Show’s Everything Electric expo in…

…Sydney NSW, we headed… in the other direction, south through Gippsland to Tarra-Bulga National Park, and a walk to the suspension bridge.