Article: Home battery with Vehicle to Home

[Mark813]

https://electrek.co/2025/08/05/tesl...-home-v2x-with-this-new-powerwall-competitor/

TLDR home battery competitor to Tesla's power wall can do a couple things including charge your EV at 25 KW off of this home battery using the dcfc circuit in your EV. Using that same DC fast circuit it can draw the EVs battery energy out to power your home.

Tesla is mentioned in the headline since it's a powerwall competitor that does vehicle to home. But the article mentions vehicle to home and multiple EVs could use it besides Teslas. It specifically mentions that Ford vehicles did well when tested with this set up. Didn't say just the F-150 Lightning did well but didn't name vehicles and we only have a couple.

What I'm curious to compare specifically is the cost of Ford's home station I think it's called that does bi-directional charging on the f-150 Lightnings.

If you haven't yet installed a home charger evse installing this battery with the 25 KW output for home charging might be interesting?

And since I live in Florida where we get hurricanes and people installed generac systems which cost around $15,000 installed parts and labor.

Could a case be made for this system (or one like it) using even just one battery and the 25kw charging system add on plus your EV running vehicle to home.

Especially when there's a power outage and this would be specifically with a Mach-e (vs the F-150 Lightning which is already set up for vehicle to home I think if you get the right model?)

I'm going to try to find out numbers from this company and when this setup might be available near me

But also some of the comments mentioned warranty issues if you use the DC fast charging circuit to draw energy out of your EV battery in this manner

Also not trying to claim this would be cheaper than one set up or another just going to try to find numbers and calculate the capital outlay from the start

Thanks!
Mark

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[HuntingPudel]

Being that Ford's official stance on the MME is that it does not and will not support bi-directional charging, there must be undocumented/unsupported things that they're taking advantage of. While I would love to leverage the battery in my car to power my home in case of blackout, I'd hate to invest in something like this that a future Powertrain software update locks out.

 

[Mark813]

Being that Ford's official stance on the MME is that it does not and will not support bi-directional charging, there must be undocumented/unsupported things that they're taking advantage of. While I would love to leverage the battery in my car to power my home in case of blackout, I'd hate to invest in something like this that a future Powertrain software update locks out.

Great point, it does not matter that it can be done if Ford changes it to can't be done with a few keystrokes and hitting the enter key in Detroit

I also realized the 25kw charging is too fast since it will drain the 10kw powerwall/home battery in short order unless you had 60kw worth of panels to take you from 20% to 80% overnight. Or somehow just two panels where one charged while the other discharged etc.

Anyway maybe Ford's big announcement next week will tell us all future models will have vehicle to home even if I have to pay the freight for their home charge installation.

 

[mkhuffman]

Great point, it does not matter that it can be done if Ford changes it to can't be done with a few keystrokes and hitting the enter key in Detroit

I also realized the 25kw charging is too fast since it will drain the 10kw powerwall/home battery in short order unless you had 60kw worth of panels to take you from 20% to 80% overnight. Or somehow just two panels where one charged while the other discharged etc.

Anyway maybe Ford's big announcement next week will tell us all future models will have vehicle to home even if I have to pay the freight for their home charge installation.

If you run a 125 Amp 240V circuit to the charger it could charge the car at 25 kW even without the batteries I think. But that 125 Amp circuit might not be possible off your existing breaker box.

 

[Mark813]

If you run a 125 Amp 240V circuit to the charger it could charge the car at 25 kW even without the batteries I think. But that 125 Amp circuit might not be possible off your existing breaker box.

Somehow I have in my head that 19.2 KW is the max you can set up for home charging on that 240 volt circuit? And the Mach-e may top out at around 11 kilowatts anyway? Even at 11kw the 30 miles of range per hour fills me up while I sleep. From zero to 100% in 10 hours 20% to 80% in 6 hours.

This article says it gets to 25 kilowatts using the DC fast charging part of your car and coming directly off the home battery to charge on that circuit instead of the regular home charging circuit in the car?

If the next gen Mach-e has vehicle to home built in that's a nice reason for me to upgrade instead of a nacs port or column shifter. It shouldn't only be the F-150 lightning that gets it.

I got overly excited about the possibilities in that article but in the light of the next day the reality of a dozen home batteries would still be expensive.

 

[Earplug]

Saw this pop up in my FaceBook feed today. If I didn't already have a Generac I might have considered this.

EcoFlow DELTA Pro Ultra | EcoFlow US

 

[Mark813]

Saw this pop up in my FaceBook feed today. If I didn't already have a Generac I might have considered this.

EcoFlow DELTA Pro Ultra | EcoFlow US

I like these, especially that you can just build and add more as you go. Just one when you need to run your refrigerator in a power outage and if you didn't lose power drag it over to Mom's house to run her fridge.

And if you move to a new house, you can take these with you.

 

[mkhuffman]

Somehow I have in my head that 19.2 KW is the max you can set up for home charging on that 240 volt circuit? And the Mach-e may top out at around 11 kilowatts anyway? Even at 11kw the 30 miles of range per hour fills me up while I sleep. From zero to 100% in 10 hours 20% to 80% in 6 hours.

This article says it gets to 25 kilowatts using the DC fast charging part of your car and coming directly off the home battery to charge on that circuit instead of the regular home charging circuit in the car?

If the next gen Mach-e has vehicle to home built in that's a nice reason for me to upgrade instead of a nacs port or column shifter. It shouldn't only be the F-150 lightning that gets it.

I got overly excited about the possibilities in that article but in the light of the next day the reality of a dozen home batteries would still be expensive.

It is a DC Fast Charger, not an AC EVSE. So it bypasses the charger inside the car (which is 11 kW max) just like when you charge at EA or any other DCFC.

If you power the DCFC with utility power, you will need at least 125 Amps of 240v AC. With losses, you might need even more to hit 25 kW charging speed.

You probably have 19.2kW in your head because the big GM trucks have 19 kW chargers instead of 11 kW. Those require 80 Amps (via a 100 Amp circuit).

 

[Mark813]

It is a DC Fast Charger, not an AC EVSE. So it bypasses the charger inside the car (which is 11 kW max) just like when you charge at EA or any other DCFC.

Right I was side tracking figuring out Mach-e evse rates compared to the DC rate but I'm curious about the consistency of the DC 25kw output on that system.

Could a newer home (or updated home) with a 200amp panel output 25kw through this add on to the home battery.

Specifically is it only outputting the 25kw DC FC directly from the battery once full or it can it also take home 240v current and output 25kw through that add on.

 

[Tampamike]

And then there’s the storm surge flooding issue. here in South Tampa there was flooding everywhere with Helene. Next time I’ll be parking mine in a high rise garage. I also bought an EcoFlow Delta Pro 3 for the fridge.

 

[Mark813]

And then there’s the storm surge flooding issue. here in South Tampa there was flooding everywhere with Helene. Next time I’ll be parking mine in a high rise garage. I also bought an EcoFlow Delta Pro 3 for the fridge.

Yeah I didn't own my Mach-e yet during the storms last year but a friend parked his EV in the Ybor City garages, I will do the same this year.

 

[Tampamike]

Yeah I didn't own my Mach-e yet during the storms last year but a friend parked his EV in the Ybor City garages, I will do the same this year.

Then that negates any V2L capability that you may have installed, at east until you drive it back home.

 

[Mark813]

Then that negates any V2L capability that you may have installed, at east until you drive it back home.

Dammit! Now I have to add a lift to my portable eco flow battery, plus home battery, plus V2H, plus solar setup!

Probably won't have V2H in time for this hurricane season. So I'll keep an eye on a garage spot if they come towards south Tampa.

Filed under "Don't let the perfect be the enemy of the good" - an evse install under $1500 will be my Christmas goal this year

 

[Mark813]

Then that negates any V2L capability that you may have installed, at east until you drive it back home.

Seriously looking at these flood systems since a lot of the homes flooded by me only had ankle high water and it mostly traveled through the door and garage transoms.

After the last few seasons, I've gotten pretty good at the aluminum window hurricane shutters and can get the house done in an hour. These systems look like you could put them up in another hour.

 

[mkhuffman]

Right I was side tracking figuring out Mach-e evse rates compared to the DC rate but I'm curious about the consistency of the DC 25kw output on that system.

Could a newer home (or updated home) with a 200amp panel output 25kw through this add on to the home battery.

Specifically is it only outputting the 25kw DC FC directly from the battery once full or it can it also take home 240v current and output 25kw through that add on.

You need an electrician to look at your breaker panel to see if you have the capacity to add a 125 Amp circuit. It really depends on what else you have in the house. If you have NG/propane heat and water heater, 200 Amp service is probably enough. IMO.

The battery is a buffer and it could output 25 kW until empty. If the battery is 25 kWh, it will last for.... 1 hour! LOL. And will add 25 kWh to your car (less losses). To fully charge your car from the battery you will need a 90 kWh battery. Are you prepared to spend that much?

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