electric car and transport, wire news

[lilian07]

Passing 1000 or 2000 A in the cable does not seem to put off the manufacturers too much (we are already at 500A with the super chargers).
Furthermore, it also appears that there will be buffer storage in the same way as fuel for motorways in particular and to avoid having too expensive infrastructure.
We are there in service and it is certainly a revolution. When it comes to thinking that the car will still be 95% stationary in all-electric mode, it is certainly not the turn that will be taken in the future, in particular thanks to the autopilot.
Unfortunately today it is the autonomy and the speed of charge the weak point, the 2 are linked to compete then surpass the thermal.
Companies are starting to provide electrical outlets in parking lots and it is almost certain that a lot of parking outlets should appear with the installation of the EV.
I see for my part a high charging speed in the stations then slower sockets for the habitat but it is also possible that the charging power increases in the habitat with the arrival of the buffer batteries (waste of EV batteries ) necessary for renewables.

Battery manufacturers are looking for this charging speed, so it's fundamental even for smartphones.

[moinsdewatt]

A fleet of fully electric buses in Marrakech

AFP published on Sep 27, 2017

Buses fully electric, and therefore without greenhouse gas emissions, will be put into circulation Thursday in Marrakech, in the south of Morocco, announced the municipality of the city.

Chinese-made, this first fleet of ten buses will be powered by a solar energy production station installed at the entrance to the city, the mayor of Marrakech, Mohamed Larbi Belcaïd, told AFP. Operated by the Spanish company Alsa, these buses cost 4 million dirhams (360 euros) and they were financed by the Ministry of the Interior, he added, welcoming an "unprecedented experience in Africa ".

By the end of 2019, "around thirty of these buses will be put into service", according to this manager, who evokes the realization in progress of a "lighting project including an ecological dimension". They will have to ensure the daily transport of more than 45.000 people, specified the municipality of Marrakech.

The project was announced at the 22nd international climate conference (COP22), held last November in Marrakech. This is a first in Africa, according to the city of Marrakech.

Deprived of hydrocarbons, Morocco has adopted a very proactive strategy in terms of "green" energies, increasing the number of announcements of environmentally friendly projects, while committing to reduce its CO2 emissions. The kingdom thus inaugurated last year one of the largest solar power plants in the world at the gates of the Sahara and aims to meet 52% of its electricity needs thanks to renewable energies by 2030.

https://www.connaissancedesenergies.org ... ech-170927

[dirk pitt]

P
Unfortunately today the autonomy and the speed of charge the weak point.

way of seeing through the prism of the current thermal vehicle.
I think exactly the opposite.

[chatelot16]

increasing the charging speed is a false lead: it makes the batteries suffer and shortens their lifespan

buffer battery in the charging stations to reduce the peak power in the network: even more stupid! that makes one more battery to fire from the loss of energy, and has a reduced lifespan to replace often

and in addition the batteries with the fastest possible charge are still too slow for us to fill up with electricity in a practical time

the solution is however simple: just make interchangeable batteries! it is necessary to standardize a model common to all the car! a battery small enough to be portable by hand, and allowing each manufacturer to choose the total capacity by the number of elements

thanks to current electronics each battery can have its intelligent system to charge according to the real energy it gives, so allow to provide batteries in various state without defrauding the user when a battery is a little weak

we could make electric cars of which only part of the battery is interchangeable and designed to empty the interchangeable battery as a priority ... so we can refuel when we go to a service station

battery supply would be an easy service to add to gas stations

the idea of ​​interchangeable battery has already been tried but failed because limited to a single model of car ... and can also be because at that time it was less easy than today to do electronic monitoring of these batteries

it was too complicated to make interchangeable batteries intended to be connected in series: need too big contact ... does not work with batteries in different state .... now with lithium batteries the fashion is rather to split them into small element ... so it's easy that all the interchangeable batteries make the total voltage of the installation, so connector not too big ... and also share the power electronics of the car so that it manages each battery indepandament

this principle of independent battery would also allow to choose the number of battery that one assembles: useless to put them all when one makes only short trip ... one assembles only the number which is enough and one reduces the weight. . and if you have an unforeseen need just go to a service station to take a few more batteries

the interchangeable battery system seems essential to me for buses that have to run a large number of hours thanks to already interchangeable conductors ... so as not to immobilize the buses to charge them, you have to change the batteries

with interchangeable batteries, everyone could take advantage of their photovoltaic panels at home by putting only half of their batteries in the car and leaving the others at home to be charged by the sun, and reversing every evening ... there are only the days when we need the maximum autonomy that we put all the batteries in the car

there would also be a converter to connect to these batteries to make 220v and replace the generator

we could make these batteries profitable for multiple uses ... there would be 8 in an average car, but we could put one for the lawn mower ... and put it back in the car when the lawn mower is not used

another advantage the battery life would be independent of the car ... if we change the car we keep the same battery ... when you have a small car and a big one you don't need to have the total number to fill them every 2

we could also buy a car with a reduced number of batteries for its average use, and rent others in a service station only when it is needed

[sicetaitsimple]

the solution is however simple: just make interchangeable batteries! it is necessary to standardize a model common to all the car! a battery small enough to be portable by hand, and allowing each manufacturer to choose the total capacity by the number of elements

"a battery small enough to be portable in the hand": uh ????? A simple solution, you say?

[chatelot16]

Where is the problem ? if you want 250kg of battery you put 10 25kg battery ... it is portable by hand for those who are fit in a service station we can even provide a mechanical assistance system

sharing a large battery in addition to a small one would be difficult with lead, which is technically favorable to the largest possible element ... but for lithium the most efficient solution is a multitude of small elements ... so there has no inconvenience to share between multiple small batteries each making the total voltage

see what is done for the laptop ... despite that there is a multitude of battery pack of different dimension and of course no compatibility it contains all the same dimension of element lithium ion ... of slightly different characteristic depending on the age, and therefore the technique available at the time, but always the same size

[sicetaitsimple]

Where is the problem ? if you want 250kg of battery you put 10 25kg battery ... it's portable by hand for those who are fit in a gas station you can even provide a mechanical assistance system

Ah but there is no problem! Getting around 250kg of batteries every day for example in the example of recharging with PV that you mentioned seems to me a strong marker of its commitment to renewable energies and electric mobility!

Well, I think I'll go back to "the" lazy man's vegetable garden "....

[Christophe]

increasing the charging speed is a false lead: it makes the batteries suffer and reduces their duration

This is not true: a lithium battery largely supports a 1C charge ... without any influence on its lifespan ...

And 1C means a full charge in 1 hour, regardless of the battery capacity.

For a Tesla at 80 kWh you therefore need an 80kW SuperCharger socket ... obviously nobody has (and will not have) that at home.

We can climb to 2C without any worries either, so 30 minutes of charging and 160kW at the outlet!

At 3C we will go to 3C and 240kW ...

Again and as mentioned above, fast charging is more of a network problem than a battery problem.

[Christophe]

with lead

Uh, we are in 2017 not 1987 ... how can we still talk about lead for traction?

Otherwise the modular battery is a pretty good idea: why carry 250 kg of battery if you only need 100 kg?

Now beware the capacity of a battery does not only determine the autonomy, it also determines the power that can be drawn from it!

And there it is as for the charge: 3C in discharge for the lithium is a maximum not to strongly decrease its lifespan.

A 20KWh battery (approximately 150kg "gross" with the best of what currently exists) will therefore not be able to give more than 50-60kW at peak (or 70hp which is already not bad)

[sicetaitsimple]

Otherwise the modular battery is a pretty good idea: why carry 250 kg of battery if you only need 100 kg?

Yep .. Just have the 150kg in stock in the garage (at best) or in the closet in the sixth without elevator (at worst?) And voila!