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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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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 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…
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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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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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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.
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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.
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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.
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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.
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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!
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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…
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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.
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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.
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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…
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It’s been nine days of grid power outage here in Emerald Victoria. T
he 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. Charging: He plugged in here for about ten minutes, drawing a max power of about 7.2kW from…
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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 battery continued to provide backup power to our…
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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. See the lead up story in our previous post: https://m.facebook.com/story.php?story_fbid=439045192389797&id=100088529584679 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…
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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 stations in the area are also closed. We hope to be…
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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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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. Charging: Kyneton and Woodend each have a 50kWh DC fast charger by Evie Networks. Disappointingly only one at each location, which can create queuing. We were only plugged in for a few minutes while using the adjacent toilet, so we were finished anyway when the next person arrived. We’ve been trying out the beta version of Evie’s new app, which is improving. But this one seemed to lack a “Stop Charging” button, so I…
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.