V2G to be approved in Australia 2025

[wattmatters]

Do people think V2G is going to be a big deal in Australia?

It'll have its niche but we now have a federal battery rebate and for the cost of a DC bidirectional charge station you can just add ~ 20-30 kWh of stationary storage to the home, permanently dedicated to the job.

I think V2G hype is overblown.

 

[tsedge]

I could see it working for people here who work from home and have their car with them in the daytime, when power prices are highest, charging it cheaply overnight and discharging in the day.

But there's only so many people who work like that.

Might actually make more sense to power workplaces from the cars parked there all day, although that's not a direct benefit to the people who work there, so it probably wouldn't fly.

I tend to agree that sooner or later, home batteries will become ubiquitous.

 

[ReintjeWA]

I think some states are hoping V2G will pick up, as it will make them less reliant on fossil fuels in the evenings (or high demand with low solar generation situations). But to be honest, why would I tax my battery to support a grid that is unwilling to pay me a fair price for my excess solar? I think a lot more has to change than just the connection between car and grid.

However, I'd happily use my car to power my own home, although I don't think it negates the usefulness of a dedicated home-battery. But considering the battery in the car is paid for, I do like the idea that I can hook it up to the house.

 

[davemc]

Depends on price of the V2G device.
Here in OZ we have heaps of Solar during the day and spot electricity prices are negative often.
I get 3 hours free 11am-2pm when I charge, although pay 4 cents extra per kWh for the other 21 hours.
Lots of people getting batteries now; a few cheap batteries out there as well.
I got a quoute for 32kWh Sig with 8kW inverter $18k, another 8
I think $6k for the DC charger.
I have 3 EVs with 180kWh of battery. If a V2G was like $6k alone be worth it.
For under $4k I can put in another 16kWh of battery to bring it up to 48kwh.

 

[wattmatters]

For under $4k I can put in another 16kWh of battery to bring it up to 48kwh.

This is my point. For the cost of V2H/G station ($7-12k) you can have a whole lot of dedicated storage instead. Let me know when they are <$2k.

 

[davemc]

This is my point. For the cost of V2H/G station ($7-12k) you can have a whole lot of dedicated storage instead. Let me know when they are <$2k.

Just got a couple of quotes in around AU$2400 for 8kW.
So yes $7k is 24kWh of dedicated battery.
Yes I'd love to use 180kWh of EV although honestly my peak prob 30kWh a day, take out the charging I do in free 3 hours..

 

[ReintjeWA]

This is my point. For the cost of V2H/G station ($7-12k) you can have a whole lot of dedicated storage instead. Let me know when they are <$2k.

True, but can you get ~50 kWh (80% of 64 kWh) of storage for the cost of V2X?

I think if you're getting a new setup, it is worth getting something with V2X capability. I would agree though that at current costs it's probably not worth it to replace EVSE and home batteries just to get into V2X.

 

[Everest]

Don't forget efficiency too. A typical hybrid inverter should have a quiescent draw of typically 20W-40W, whereas the V2L/H/G vehicle is likely to have an overhead of around 200-300W as it is running more of the vehicle's internal electronics. So, if you're only powering basic home devices (fridge, freezer, router, tv. etc.) with a total consumption of, say, 400-500W you could end up with an "efficiency" of only 60% when using your vehicle as the home energy storage device.

 

[wattmatters]

True, but can you get ~50 kWh (80% of 64 kWh) of storage for the cost of V2X?

It is a car after all, one would assume you do plan to drive it sometimes and might actually want the thing to be charged up ready for a drive, not depleted after running the heat pumps all night and cooking your breakfast.

Is the car always going to be available and plugged in to charge when cheap and discharge when expensive?

Dedicated home BESS is there, 24x7, always optimising your home's energy flows.

Use of a car's battery as a supplemental source on occasions as/when needed makes sense. But to spend $7-12k on that is nuts. Especially when most car manufacturer warranties (including MG) do not cover use of the vehicle in this manner, and the V2X equipment manufacturers also deny all liability for anything that goes wrong.

 

[davemc]

I looking at either a 24kWh, 32kwWh or 40kWh battery. Difference between 24-40kWh is around AU$4800.
Which does not sound much compare to a DC Charger around $6-$7k.
I currently have 3 hours free I charge and 3 EV's with 180kWh; I'd like to tap into that if it's worth it.

I just crunched last 2 years of Elec data and removed the EV charging when it was free or cheap.
I used a avg 17kwWh a day. Not sure I need 180kWh .
Over 2 years had only 31 days over 24kWh and extra 86 days over 20kWh.

Honestly if V2X charger was only $2-3k alone be worth it.
Although you need to buy the Sig setup to start with.
I could go 8kWh and a DC charger around the same $ as 32kWh stand alone.