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Adding a second battery
When Lightning Energy installed our Powerwall 2 back in December 2023 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 start fresh with new hardware. For me, that…
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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 — disconnecting the ducted heating
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. 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. 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. They both needed electricity to run. In fact, in addition the gas consumed, the heating used about 1kW of…
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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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What do the kW and kWh measurements mean?
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…
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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…
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Solar, battery and electrification — series intro
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…
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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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Our Powerwall — one of a million deployed
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.
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Finally, the Dandenong Ranges Botanic Garden
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.
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A new find: Ripe Cafe in Sassafras
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.
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Emerald's Lost Woods Market draws a crowd
This is probably the busiest we’ve seen our town of Emerald, Victoria. The 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.
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Home in Emerald, autumn in full swing
We arrived back home, in Emerald Victoria. Autumn is still in full swing. 🍂
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Why NRMA Airlie Beach is a shining EV light
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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Cooling off at Seaford Pier
Cooling off at the beach under Seaford Pier. Dinner: Chicken and mango salad, brought from home.
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36 wild hours on battery in the Dandenongs
It’s been wild 36 hours here in the Dandenong Ranges. Yesterday 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…
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Lauritos pizza, transported in the frunk
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.
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Four double scoops, kept chilled by the Tesla
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.
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An 'EV' for the hedges
I tried out another “EV”, kind of – an Electric Vegetation cutter 😉. Okay, that’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…
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Nine days of grid outage in Emerald
It’s been nine days of grid power outage here in Emerald Victoria. The community has pulled together to share resources. Today I received an SMS from Ben to ask if he could charge at our place. I assumed it was another neighbour asking if they could plug their phone or laptop in to the power board we laid out in the porch. We were the only house in the street to still have power after the storm hit, thanks to our Tesla Powerwall battery. It’s been charging up each day from solar panels on the roof. But Ben was actually after a place to charge his EV. I had forgotten about our listing on PlugShare during all of the neighbourhood blackout dramas. I said yes, no problem. Today he had driven from his home in Packenham east to Sale, then back west and up the hills to Emerald, and has a few more nearby drives to do before returning home. The navigation said he would get home with 8% charge, but that wasn’t accounting for extra stops. So, he wanted to play it safe.
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Back home with battery power
We’re are back home in Emerald and have power! The grid is still out, and is expected to be down until mid next week. But our house is getting power from solar and our Tesla Powerwall battery. Driving back home (after our road trip to NSW), we could see why Emerald is still in the dark. Many power lines (and phone/broadband lines) are still down. Emerald featured in the first story on last night’s (Friday) ABC news: https://iview.abc.net.au/show/abc-news-vic At least one of our neighbours is running a fuel generator. Another has a couple of solar panels hooked up to a car battery for night lights and a 12V car fridge. Schools are effectively closed. The local petrol station had one pump going, with a long queue. We have offered our neighbours electricity from our solar/battery power. One family had no power for three days, but now we have connected some extension cords over the fence. History: The grid died on Tuesday 14th. We were away road tripping in NSW. Our Tesla Powerwall…
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Powerwall hits zero during the grid outage
Well, that’s not good. The Tesla Powerwall at home has just gone flat (zero percent charge) at about 5pm today. Our new home town of Emerald is one of many affected by the grid outage in Victoria, after a wild storm hit on Tuesday afternoon. A couple of months ago, we had Lightning Energy install solar and a Powerwall battery at our new home. In a grid outage, the solar array is supposed to keep the house electricity going, recharge the battery each day, and keep the fridge cold. But the solar production stopped working when the grid outage started. Something is wrong with the installation. The battery has slowly depleted, until it hit zero percent two days later (this afternoon). I contacted the installer, Lightning Energy, a couple of days ago to hopefully fix it before the fridge died. No answer from service. So, I SMSed Andrew, who works for them and lives locally. He kindly offered to pop in on his way home to take a look. Here’s hoping we can get power from the sun back…
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Wild weather hits Victoria
Wow, what a wild weather ride in Victoria yesterday. We’re still in NSW, but the Weather app summarised the weather at home in Emerald as “Fire Weather” 😮. The heat was followed by a heavy storm that knocked down many trees and power lines. In the middle of the day, wholesale electricity prices peaked at a hundred times the norm at nearly $20 per kWh (normally under 20c per kWh). I checked our home remotely using the Tesla app. It was exporting power from our battery (and solar) to help keep the grid supply going, whilst paying us about $100 per hour for the supply! Our battery has continued to supply power to our home during the blackout. We messaged some of our neighbours an invitation to come over and plug in any needed devices (such as phones or a portable fridge). A few of them also checked on our house for us. Great neighbours and community ☺️. We might need to also offer them showers because those with on demand gas hot water often need electricity to light them. All the petrol…
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Tesla battery and wall charger installation
The team from Lightning Energy installed the undercover pieces today, while it’s raining, and deferring to tomorrow the installation on the roof of the solar panels, if the sun comes out. We had originally scheduled this installation for December 11 and 12, but rain on December 11 saw it canceled. We had this Tesla wall charger at our last house in Saratoga NSW, a year ago. The new owners there didn’t have an EV, so we modified the contract for us to remove the EV charger. It has sat in storage until the removalists delivered our belongings here a few days ago. It wasn’t really practical for us to bring the Tesla “Powerwall” battery with us from the old house, so we bought a new one for this house. It costs about $15k, which is a lot. There are cheaper battery options, but we know the Powerwall has a large capacity compared to cheaper batteries, and works well with the app, scheduling, blackouts, etc. We have heard from a few people in Emerald and the Yarra Ranges in general that…
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Visiting 'Tarquin' the burnt-orange Tesla
We popped in to see Kylie, Aaron, their family, pets and newly wrapped “Tarquin” the Tesla, in its burnt orange glory. We first met them (back when Tarquin was white) nearly a year ago when we were road tripping towards Cairns (and the Daintree). Since then, Kylie has been following along on our blog, making suggestions along the way. They kindly invited us for some afternoon tea today ☺️. The finished edges of Tarquin’s wrap are impressively neat. Our Tesla is basically the same, except ours is wrapped in bugs and thousands of kilometres of road dust. Francis was ready to adopt a few of the pets. We considered charging in the garage, but the pricing (made especially for us) was too high 😉. We stayed overnight in a motel in Mackay, which turned out to be right under the flight path, next to the airport. It was amusing, rather than annoying, until perhaps the 6am wake up call of what seemed to be a truck on our roof.
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Woodend and Kyneton house-hunting
Today we drove out through the towns of Woodend and Kyneton, Victoria. Beautiful towns, even on a cold windy day. We’re still looking for a possible new home. We looked at one house at Kyneton Bushland Resort. Another house had 14kW of solar panels, a Tesla Powerwall house battery and a Tesla EV charger. Lunch at Home Grown on Piper was delicious. We bumped into the owners of a blue Tesla Model Y with the licence plate BEM3UP (“beam me up”) at one of the houses and at the Kyneton charger. Of course we discussed Star Trek 🖖. Also had a brief chat with Tony, on a ride on his electric Harley Davison LiveWire, with his other biker mates.
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A bollard manoeuvre, and meeting Patty
Manoeuvred my way around the bollards with a three point turn again, at the RACQ Chargefox charger. Chatted briefly with Scott (before me in a blue Tesla Model 3 with bikes on a rack) and Patty afterwards. Patty is today moving with his dogs up from The Sunshine Coast to Port Douglas. His wife is driving another Tesla. They are planning to “hippy-fy” their new place with EV chargers for guests.
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An Audi e-tron meet, with Linda and Louis
We waited for another Tesla Model 3, which was at 99% for ages when we got there, not checked in, in PlugShare. Then had a chat with Linda and Louis who arrived a while later, in their Audi e-tron. They had travelled from Wollongong, passing through Port Douglas. We agreed that we need more than one RACQ Chargefox fast charger in these locations. The layout of this charger is great: easy to park; can charge from either side; near shopping and toilets.
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Mossman Gorge in the Daintree
Visitors have to park at the center, then catch a shuttle bus to the gorge, then walk a nice 640m boardwalk to the popular river spot. The centre includes a cafe, toilets, gift shop and ticket counter. It’s pretty but seems to be a large overhead for a fairly standard river view, with room at the gorge for a limited number of visitors. There is a longer 2km walk, but we didn’t try it. They advise not to swim, but half the people do. We found out later that a couple of tourists were swept away by the river, prompting a search.
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Made it to Cape Tribulation
We made it to the northernmost point of our road trip: Cape Tribulation. Lush vegetation, lots of wildlife if you look closely. The ocean is eerie – it’s hard to tell where it ends and the sky begins. It’s so very humid in summer. Great little cafe/kiosk where we were staying. But we also cooked our meals in the camp kitchen. There’s no grid power here, north of the Daintree River, so the Safari Lodge and Campground (our accommodation) and other places all run on diesel generators. The generator supplies the electricity for the powered sites, cabins, lights, kiosk, washing machines, everything. A few places have solar panels. There are plans for a micro-grid to get rid of the diesel generators. I'm surprised that they don't have more solar here, but it is coming
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Crossing the Daintree River ferry
We crossed the Daintree River on the ferry. Notice on the other side of the river the toddler that seems to be driving a car from the sunroof.
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Charging in Cairns, plus an AQUA Lagoon coffee
Charged up for the trip to Daintree. Managed to beat Kylie and Aaron this time, who resorted to the slow 11kW charger next to us, until we finished. Enjoyed a delicious coffee and an ice block with fruit in it at AQUA Cairns Lagoon cafe. Tried to block a photo of me in portrait 🤪.
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Queueing at the Cardwell charger
We charged up at Cardwell (south of Cairns). We initially queued behind Aaron and Kylie in their Tesla Model 3 (Mackay to Cairns). While waiting, we drove up the road to buy lunch from a cafe, under “The Big Crab”. When we returned, we queued behind Vijay and his family in their MG (Port Douglas to Brisbane). We ate our lunch the pretty park next to the charger, whilst avoiding swimming and being eaten ourselves by crocodiles.
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We might be a little bit crazy
We moved out of our home, sold what we could, moved the rest into storage, and set off road tripping in our Tesla Model 3. It?s the cheapest, smallest Tesla, with RWD (rear wheel drive), LFP battery and about 430km range. It runs on electricity. No petrol, oil, smell, noise etc. We?ve only had it three months. We have a bed that fits the back of the Tesla from Tessories Australia, a Carsule tent from MOGICS, a huge 50L camp fridge, camp chairs and other gear from KILOS GEAR. When we can’t find accommodation, the Tesla will be our home for the night. We were living on the NSW Central Coast, in Saratoga. All of our kids have grown and moved out. We need to downsize and reset. But, for the moment, we are without a home, other than the Tesla. We had only booked accommodation for our first two nights, in Port Stephens. We’re just winging it from there. The rough plan is to then head west through Mudgee and Dubbo, then up through Tamworth and Armidale, then up through Queensland to Airlie…
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Setting off on our east-coast EV adventure
We packed the essentials into our electric car (Tesla Model 3) and set out to explore the east coast of Australia, out to Dubbo, up through Queensland to Cape Tribulation, down from Mackay to Bega and along the south Victorian coast, Great Ocean Road, The Grampians and much more. Last lunch before we go, courtesy of Shelly's Cafe. Somehow we managed to fit all of that (including 50L fridge, bed, chairs, tent, food, clothes, computers) into the smallest car that Tesla make.
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.