EV are they worth it?

[morqthana]

...with no losses.

A 100t weight 26m up, in Earths average gravity, contains about 7.1kWh of potential energy.

What you do with it is up to you, but I don't think there's any way to actually lose any of it.

But please do let everybody know if you manage to create about 0.28µg of matter....

 

[morqthana]

oh , I was planning to have a lift that would get the occupants to ground regardless the altitude of the house..

How much of their stored energy would they have to use to power that lift?

 

[morqthana]

Now there's an idea. I reckon a small bungalow is about 100 tonnes, so maybe we can have a system where we winch the entire house up in the air overnight, get a great view in the morning, and then the fall provides the energy for the day

Can I have some batteries instead, please.

 

[Avocet]

A 100t weight 26m up, in Earths average gravity, contains about 7.1kWh of potential energy.

What you do with it is up to you, but I don't think there's any way to actually lose any of it.

But please do let everybody know if you manage to create about 0.28µg of matter....

Of course there is! Electrical generators are bloody good, but they're not 100% efficient, and then there are grid losses on to of that. Remember, we are talking about electrical power generation here...

 

[morqthana]

Of course there is! Electrical generators are bloody good, but they're not 100% efficient, and then there are grid losses on to of that. Remember, we are talking about electrical power generation here...

That's not what you said.

You were denying the amount of potential energy in an elevated mass.

When lowered, the potential energy becomes other forms of energy, but none of it is lost.

 

[Avocet]

That's not what you said.

You were denying the amount of potential energy in an elevated mass.

When lowered, the potential energy becomes other forms of energy, but none of it is lost.

I never mentioned potential energy once! You're talking from a purely theoretical point of view (and I don't disagree with either the maths or the physics), I'm talking from an engineering point of view about using it as a means of generating electricity (which was what was being discussed).

 

[StephenStephen]

Just thinking - if you were in the group of Tesla owners who get free charging from Tesla Superchargers, you could charge up there, go home, and flog the power to your supplier for pure profit.


But what I'm really wondering is never mind V2G - what about V2H (house)?

Does anybody know how feasible it is/would/could be for an EV owner to use their car as an emergency supply just for themselves, in just the same way they could use a generator? So car -> inverter -> changeover switch?

Using electricity from the car battery in the house is easy if you have a V2G charger - hopefully coming soon for CCS (It's taking an absurdly long time).

It's possible to plug in an appliance or two if you have a car with V2L.

Using the car battery when there's a power cut is a bit more complex - you'd need a switch to prevent the car being connected to the house at the same time as the grid, so you don't electrocute anyone working on the grid, and you'd also need to sort out earthing for the car-house system.

 

[StephenStephen]

Yes, true, but the problem is the massive amount of storage needed. We have adequately solved short term, small amounts of energy storage - it's the mass storage we are struggling with, enough storage, to last longer than a few minutes.

My home, using gas and electric - gas heated, gas cooking, gas water heating, consumes 5 to 7Kwh of electric per day. So for 24hours use, I would need to store 5 to 7Kwh. Which would involve to pretty hefty, and expensive batteries. My home is just one, of millions.

Translate that storage to a concrete block power storage, and a guess of the top of my head - a 100 ton block, raised to the height of a tower cranes, might generate 7Kw on the way down.

That capacity house battery is currently pretty run of the mill.
...an EV battery (with say a pretty low capacity of 60kWh) with a V2G charger would have no problem for a few days...

 

[Harry Bloomfield]

You said: "...and a guess of the top of my head - a 100 ton block, raised to the height of a tower cranes, might generate 7Kw on the way down."

It was just a figure of the top of my head, but 7Kwh is 7Kwh. A measure of stored, or used energy. If the storage medium is lossless, then you get 7Kwh back out. How long the 7Kwh actually lasts, in use, is entirely dependent on the rate of consumption. In my case, the 7Kwh, would last around 24 hours.

 

[JohnD]

7kWh is surprisingly little. Quite a modest electric motor could lift a house in several hours. I think it would not be worth the trouble and expense of building the lifting equipment.

The hydro-electric storage plants seem to be quite successful, though.

 

[Harry Bloomfield]

The hydro-electric storage plants seem to be quite successful, though.

For matching the peak demands. They have little capacity, able to keep the grid supplied for hours.

Consider them slow charge, rapid discharge. Once made use of, they become slow to recharge, and done when there is power surplus.

 

[JohnD]

Compared to a house on a crane?

 

[morqthana]

I never mentioned potential energy once!

There is no way that a value of energy contained in a stationary mass which has been elevated can be anything but potential energy.

 

[robinbanks]

if you have a V2G charger

And a V2G vehicle. They're also rare

 

[DiyNutJob]

Why do I only post about EV fires? Because of risk of burning the house down!