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…

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…

What do all the electricity measurements mean?

1. Australian household electricity runs at about 240V “volts”. All your power points and devices are 240V. This is basically a measure of the force used to push the electricity. 2. The “current” is basically the throughput of electricity, measured in Amps. It varies for different devices. A modern LED light bulb uses less than 0.1A (Amps). A toaster or heater will use around 8A. The typical maximum allowed by a standard power point is 10A. 3. The total power of the electricity is measured in watts. We multiply the volts by the amps (voltage x current) to get the watts. For example, if your appliance uses 5A at 240V, then that’s 5 x 240 ‎ = 1,200 W, which is 1.2kW (kilowatts). A light bulb uses less than 0.1kW. 4. The total energy used by a device is calculated as the power x time. For example, if you use an appliance running at 1.2kW for 10 hours, then it uses 1.2 x 10 ‎ = 12kWh (kilowatt hours). A light bulb could run for days on the same 12kWh. 5. When you use electricity from the…

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.

Home Battery Introduction

Are you considering a battery for your house? Here is a basic introduction, based on our experience. I hope it’s helpful. Please comment about any errors, omissions or questions. 1. Why is there more talk lately about getting a battery for your house? 1. As of July 1 this year, the federal government will pay for 30% of your home battery purchase. This makes it 30% cheaper to buy one. 2. What’s the purpose of a house battery? 1. A battery provides power to your house, as electricity. 2. It can power anything in your home that runs from electricity, including your fridge, lights, power points, TV. 3. It can keep your house appliances running when there is a grid outage (a “blackout”). 4. If you have solar panels, a battery can store the excess power generated during the day, so you can use it at night to avoid paying for electricity. This is why it is often called a “solar battery”. 5. You can also charge a battery from the grid when electricity is cheap, and use it when electricity is…

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

Our home Powerwall battery is one of a million deployed so far.

The Tesla app celebrated by listing the stats of our install, and the fleet as a whole. Our battery has saved us (and our neighbours via extension cords) from 13 days of blackouts, without any noisy smelly generator, or trips to refill it with petrol. Our solar system has generated 16MWh of energy so far, used by our house appliances, home battery, our car and exports to the grid. At an average ball park price of say 15c per kWh, that’s $2400 worth of electricity, with no ongoing running cost.

After two years in the Dandenong Ranges, we finally visited the Dandenong Ranges Botanic…

…Garden. Amazing to see in Spring. It’s a huge place. I think we covered only 20% of it. Parking seems to be extremely limited and unmarked, in a dirt section across the road, which led to highly questionable parking. Charging: Today’s trip was partly due to a frequent oddity of owning an EV. We had an excess of fuel. It feels like a shame not to use it, for free. The solar production from our roof fully powered our EV, home and house battery, and it wasn’t worth exporting any to the grid (negative feed in tariff). Fortunately, as you can see from the graph, the Amber app shut down our solar production while we were away, after our home battery was fully charged. All automated, so we didn’t have to do anything.

In life you need goals. Today’s goal was to find a cafe we hadn’t yet tried 😉, in our…

…home of the Dandenong Ranges. Ripe Cafe in Sassafras was a great find. Guacamole (avo toast) topped with thin sliced potato crisps, and zucchini slice. Lots of cyclists out today, including this giant Saint Bernard. The local park has interesting seating, or perhaps a one turn swing set 😳. I checked in on our parked car from the Tesla app, after some dodgy parking in front of us. We love driving through the fern trees and tall timbers of the Dandenong Ranges. Beautiful all year ‘round. Charging: While we were away from home, the sun had fully charged our home battery. We returned, plugged in, and filled up the car with the remaining free energy of the day.

This is probably the busiest we’ve seen our town of Emerald, Victoria. T

he Lost Woods Market draws a huge crowd. It’s a beautiful stroll through the tall trees, past numerous stalls and food outlets, with Puffing Billy Railway choo-chooing past every now and then. It’s a magical place. We parked up the other end of town, starting off with brunch at Over the Road Cafe, then walked through the jammed main road to the markets. The generators of many stalls lined the back path, filling the air with slight fumes and noise. It’s a shame they don’t have grid power. We hoped to see some stalls powered by V2L EVs, as we’ve noticed at some other markets, but none here. Charging: While we were away from home, the sun charged up our home battery. When we returned, it switched over to start solar charging our car. Win win.

We arrived back home, in Emerald Victoria. Autumn is still in full swing. 🍂

Charging: We charged up for just a few minutes in Yea earlier, since we could fill up cheaper at home. But when we arrived home, our area had a grid outage. Our house PowerWall battery kept our appliances going until the grid was restored. In an alignment of failures, our solar system also stopped producing electricity 😩. So, we can’t charge up the house or car battery from the available sun. We’ve raised a fault with our installer, Lightning Energy, who can hopefully find out what’s going on with our Enphase system. It’s not the first failure. In the mean time, the grid has reconnected, and we’ve charged up during the cheap power times in the day, when renewables are mostly powering the grid.

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.

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.

Cooling off at the beach under Seaford Pier.

Dinner: Chicken and mango salad, brought from home. Charging: Driving on sunshine, as usual. Apart from charging the car, our home solar system also stored the excess solar power in our home battery, which exported to the grid during peak demand, using the Amber Electric app automation. Nice!

It’s been wild 36 hours here in the Dandenong Ranges. Y

esterday afternoon, the power went out in our town of Emerald. We heard it was due to a fire somewhere. We sent out a few texts to our neighbours to offer our battery backup power. We ran our heavy duty extension lead over the fence and set up a power board on the front porch for phone charging. A few hours later, the grid was back up and running. But, the pending storm warnings made us cautious. Sure enough, an hour or so later, the storm hit. Heavy rain, pounding hail and strong wind. Marvin the robot mower happily sits charging out in the rain. But I didn’t fancy the chances of his camera eyes surviving the hail stones. I used the iPhone app remote control to drive it under our pergola, while the ice golf balls bounced on the lawn. Sure enough, the grid connection died again during the night, probably due to storm damage to power lines and other infrastructure. In the morning our neighbour reconnected to our power supply. We inspected the hail stones that had formed a layer on our…

Friday night, pizza and movie at home.

Pick up from Lauritos Pizza, in Emerald, in the Tesla, transporting it in the “frunk” (front trunk) to keep the takeaway smell out of the cabin. Charging: The solar panels on our roof at home topped up the car to 100%, and the home Powerwall battery, ran our home appliances and exported a bit to the grid.

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.

Double the EVs and double the ice creams.

This time I took a large container to Bam Bam Italian to buy four double scoop ice creams for us and our guests. The car kept the temperature at a chilly 15°C while Kyla accepted the challenge to scoop two spheres into each cone. Tomorrow, we’re off to Emu Plains Markets. Charging: Our guests arrived in their BYD Atto 3 just in time to get the few scraps of solar power from our wall charger. Then we paused the charging until after the peak demand period, resuming after 10pm, mostly from our Tesla Powerwall battery.

I tried out another “EV”, kind of – an Electric Vegetation cutter 😉. Okay, th

at’s a bit of a stretch. It’s an electric hedge trimmer. Emerald has so much vegetation, and our place is no exception. Hundreds of meters of hedges. The RYOBI electric hedge cutter is fairly quiet, instantly turns on and off, and is fueled for free by the sun via our roof solar panels. While cutting, it did occur to me that using a petrol powered hedge trimmer would be a much less pleasant experience. Much louder, with fumes in my face, heat and higher fire risk. I’d be dependant on an external fuel supplier to truck in petrol from hundreds of kilometers away, and I’d have to drive to a petrol station to get it. When the battery goes flat on this electric model, I just plug it in and walk away to do something else. It will take an hour or more to recharge, but I don’t have to do anything. Plugging in the battery takes a few seconds. If I really wanted to keep going immediately, I could swap with another charged battery, but I like the forced break 😉. I am aware that lithium ion…