Nissan Leaf Range Extender

Hi all

More astute readers will have divined that this thread does not actually pertain to an amplifier problem. In fact I'm trying to design and build a range extender for EVs based on Panasonic 18650 batteries (like Tesla!). The closest I can get is a design for a 2 Kw-Hr electric bike pack which is close but needs a DC - DC
converter. I'm hoping to get 12 units in the device under 100kg.

You guys know your way around the electrical design business, anybody kindly point me in the right direction? (other than towards the exit which I so richly deserve!),(we are all sinners and I do go to church), (sometimes).
 

alex1966

Member
2010-05-01 1:22 pm
It's the slowing down that wastes the fuel.
Energy recovery during slowing down will bring big benefits to extending the range.
Improvements to the efficiency of the energy recovery and re-use is where the research has to go.
Or convince the roads authorities to remove all the junctions and roundabouts and traffic lights and speed bumps. It's the slowing down for them that wastes so much of our energy resource.
And who thought about putting the off ramp down under the main road?
All on/off ramps should, for better economy, be above the roadway.

i.e. don't brake, find a straight level road that is longer than the range of the battery/capacitor.
 
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energy recovery has the potential to NOT waste fuel during the slowing down.
If the energy recover during the slowing down were 100% efficient then all the energy lost during the slowing down would be stored and if that could be reused @ 100% effciciency then you can regain the initial speed prior to slowing down. The only extra required would be due to the friction during the slowing down and accelerating phase.

Any energy one can recover and re-use that is better than 0% efficiency will reduce wastage. That in turn extends range.
The higher the effciciency of that recovery and re-use the higher the range.

It's all about NOT wasting energy due to having to slow down.
 
You are just being pedantic.
It is not pedantic.
The whole energy recovery thing is about NOT WASTING fuel/energy due to slowing down.
Being stationary with the handbrake on uses NO FUEL. Is parking your car up at night wasting fuel as the brakes are on?
being stationary is NOT slowing down. It comes AFTER you have slowed down to a stop.
 

billshurv

Member
Paid Member
2014-03-01 11:53 pm
Is it impossible for you to say 'oops I got it wrong, what I meant to say was'? Braking does not waste fuel.

constant velocity is the most efficient way from A to B, but slowing down is not wasteful. Its the accelerating that is wasteful.

You do understand how cars work?
 

billshurv

Member
Paid Member
2014-03-01 11:53 pm
I think what Andrew is trying to get across is that having to brake unnecessarily (and subsequently accelerate to get back up to speed) wastes fuel. Stop start city driving uses a lot more fuel than constant speed highway driving.

Tony.

Yes, but he was wrong in saying wastes fuel. It wasted the kinetic energy. He then went back to saying fuel (potential energy). Would be nice for once in his 50k+ posts for him to say he got it wrong rather than chanelling a well known character here!
 
Yes, but he was wrong in saying wastes fuel. It wasted the kinetic energy. He then went back to saying fuel (potential energy). Would be nice for once in his 50k+ posts for him to say he got it wrong rather than chanelling a well known character here!
I cannot agree.
It is the braking that wastes the fuel.
Feel the heat in the brakes. They get hot because they are absorbing the energy due to slowing down/braking.

It is the slowing down that wastes the fuel.

It is this phase of energy recovery that can be improved.
Improve energy recovery during the slowing down phase and re-use that recovered energy for useful work.

It is simple automobiles.
 

billshurv

Member
Paid Member
2014-03-01 11:53 pm
I cannot agree.
It is the braking that wastes the fuel.
No fuel is used braking. By that argument you should leave your car going around in a circle at night rather than stopping it as stopping wastes fuel.
Feel the heat in the brakes. They get hot because they are absorbing the energy due to slowing down/braking.
Kinetic engergy NOT chemical potential energy
It is the slowing down that wastes the fuel.
Still no

It is simple automobiles.
You keep thinking that....
 
By that argument you should leave your car going around in a circle at night rather than stopping it as stopping wastes fuel.

No, that wastes more fuel.

<edit> I'm not sure what's at the root of this disagreement, though I think it hinges on the difference in meaning between 'use' (billshurv) and 'waste' (AndrewT). The dictionary says that waste means to 'use to no purpose'. Thus when Bill responds to AndrewT's 'Braking wastes fuel' with 'Braking uses no fuel' he's not actually rebutting AndrewT's point because the meaning of use <> waste. Crossed purposes perchance?
 
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