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25-01-2020, 03:40 PM
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Electric vehicles... a question for the technically minded.

We often see hybrid cars advertised that run on both petrol and electric and are self charging. If a vehicle can be self charging, is it not possible to make a self charging fully electric model? Sort of a dynamo set-up but where the car is charged once only and then never needs charging again unless something goes wrong.

Just a thought.
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25-01-2020, 03:51 PM
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Re: Electric vehicles... a question for the technically minded.

Originally Posted by Longdogs ->
We often see hybrid cars advertised that run on both petrol and electric and are self charging. If a vehicle can be self charging, is it not possible to make a self charging fully electric model? Sort of a dynamo set-up but where the car is charged once only and then never needs charging again unless something goes wrong.

Just a thought.
No is the simple answer. One of the simple laws of physics is that energy can neither be created nor destroyed. The ads are, at best, misleading.
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25-01-2020, 04:38 PM
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Re: Electric vehicles... a question for the technically minded.

To be self charging it would have to have solar panels on the roof,even then that would not replace energy used
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25-01-2020, 05:25 PM
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Re: Electric vehicles... a question for the technically minded.

Originally Posted by Longdogs ->
We often see hybrid cars advertised that run on both petrol and electric and are self charging. If a vehicle can be self charging, is it not possible to make a self charging fully electric model? Sort of a dynamo set-up but where the car is charged once only and then never needs charging again unless something goes wrong.

Just a thought.
Impossible Longdogs. They would break the 1st law of thermodynamics, which states, "When energy passes, as work, as heat, or with matter, into or out of a system, the system's internal energy changes in accordance with the law of conservation of energy".
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25-01-2020, 05:52 PM
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Re: Electric vehicles... a question for the technically minded.

There are new technologies being developed, for example which recover braking energy but such technologies can never recover 100%, that would be perpetual motion which has proven impossible to achieve.
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25-01-2020, 06:40 PM
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Re: Electric vehicles... a question for the technically minded.

Originally Posted by Longdogs ->
where the car is charged once only and then never needs charging again unless something goes wrong.
Non starter Longdogs (Excuse the pun)

As others have said above once the car moves it uses energy, that energy has to be replaced. It is a basic law of science you can put energy in (from the petrol engine or from the mains supply in your house) but once the electric car moves you are taking energy out.

So, unless recharged at regular intervals the car will eventually stop.

Also do NOT believe all the adverts about range, they are deliberately misleading. The range of an EV is much less than quoted in winter at night with heater, lights, radio, wipers etc. running but most quote a distance in perfect conditions.

I won't be buying an EV until that one is sorted
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25-01-2020, 08:31 PM
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Re: Electric vehicles... a question for the technically minded.

Originally Posted by Barry ->
There are new technologies being developed, for example which recover braking energy but such technologies can never recover 100%, that would be perpetual motion which has proven impossible to achieve.
Yes "perpetual motion" is what it's called. Man has been fascinated by the prospect for centuries. I became interested at the age of five, back in the 50s. Hmmm ... maybe one day ...
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25-01-2020, 10:43 PM
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Re: Electric vehicles... a question for the technically minded.

Thanks for the replies. I remember now. It has been a long time since I learned about the laws of physics.
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26-01-2020, 01:58 AM
9

Re: Electric vehicles... a question for the technically minded.

Originally Posted by Longdogs ->
We often see hybrid cars advertised that run on both petrol and electric and are self charging. If a vehicle can be self charging, is it not possible to make a self charging fully electric model? Sort of a dynamo set-up but where the car is charged once only and then never needs charging again unless something goes wrong.

Just a thought.
I know that they recover energy from braking but perhaps they are referring to the fact that the charger is built into the car so all you have to do is provide the mains power.

I understand that the built in charger can sense the type of power available and respond accordingly. IE if it is a normal 10amp power point it will only draw less than 10 amps, if it is a 15amp power point is will draw more. However if it is a proper car charging port it will draw as much as it needs until the battery is charged.

Not sure of this video explains it but Big Clive is worth watching any time.

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01-02-2020, 08:00 AM
10

Re: Electric vehicles... a question for the technically minded.

Originally Posted by Longdogs ->
We often see hybrid cars advertised that run on both petrol and electric and are self charging. If a vehicle can be self charging, is it not possible to make a self charging fully electric model? Sort of a dynamo set-up but where the car is charged once only and then never needs charging again unless something goes wrong.

Just a thought.
LD, do not ponder this stuff, keep your Diesel Smoker for now, bypass the EV phase and wait, patiently for the "Magic Carpet" era.
 
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