Quickcharging an EV, how much power do I need?

There are two points on which people criticise Electric Vehicles (EV):

  • Their range
  • The time it takes to charge them

The first can be solved by ‘simply’ adding a larger battery, this can be in physical size or having more Wh’s (What Hours) per Kilogram.

Filling the tank of a car with a ICE (Internal Combustion Engine) takes about 3 minutes, it is something we are used to. But charging a EV can take up to several hours.

A lot of people say that they will start driving an EV as soon as the range gets better or charging can be done fast, like they are used to right now.

Charging a EV really quick has a few problems which can not be solved that easily:

  • The batteries can’t be charged that fast (Yet)
  • It takes a lot, really A LOT of energy to charge that fast

Take a Tesla Roadster for example, this car has a 53kWh battery pack. 53kWh equals to 190800000 Joule (53 * 1000 * 3600). If we want to charge this battery in 5 minutes, we would need to put 636000 Joules per second into that battery. 636000 Joule equals to a current of 636kW (636000 / 1000).

A simple micro-wave in your kitchen uses about 1kW of energy, charging a EV that fast would use the energy of 636 micro-waves! That would put a lot of stress in the grid, too much stress.

If we charge the EV in 10 minutes we would ‘only’ require 318kW of energy, 20 minutes 159kW and 30 minutes would take 106kW of energy. Those are still high numbers, but they come closer to what is possible.

Take the Nissan Leaf for example, this car has a 24kWh battery which can be charged to 80% in 30 minutes, let’s calculate how much energy we would need.

80% of 24kWh is 19.2kWh, that equals to 69120000 Joule (See my calculations above). 30 minutes equals to 1800 seconds, so charging in 30 minutes requires 38400 Joule per second, or 38.4kW of energy.

Charging that quick will mostly be done at 480 Volt. 38400W / 480V = 80A, that is how much we need to charge a Leaf that fast.

3-phase 480 Volt is not that hard to find / get here in Europe, so charging a Leaf that fast is feasible on a lot of locations.

Not only will quickcharging put a lot of stress on the grid, it would also be unsafe for humans to connect such cables. If the current which flows through that cable would be exposed to a human, you would instantly be killed, no doubt.

Quickcharging a EV has a few drawbacks, let’s sum them up:

  • Bad for the battery

  • Puts a lot of stress on the grid
  • It would be very dangerous for humans to handle such cables

But why would we want to do that? A EV can be charged everywhere! Your car will be parked for most of the time during the day. Those are all possible charge possibilities, we should work towards utilizing those moments. Ofcourse, there will be some places where quickcharging will be possible, but I think they will be placed on strategic locations like road-side restaurants.

I think we need to let go of the concept of filling up our car within a few minutes. In the future battery technology will improve and we will start to see battery packs ranging from 75kWh to 150kWh, which will bring us where we want to go, charge there and get back again.

Tesla Roadster coming soon!

While I’m waiting for my Tesla Model S a friend of mine just bought his Tesla Roadster 2.5, cool!

He choose the Fusion Red color with the executive interior, what a gorgeous! A few pictures below.

While it’s a beautiful machine, it’s also fast and eco-friendly! If you read my blog you might notice that I’m into EV’s, not because I’m such a “environment hippie”, but I simply like the technique behind it.

Right now we are working on getting the fuses at our office upgraded from 1x 35A (230V) to 3x 35A, so that we can use 32A’s charging the roadster.

One of the interesting things is that we live in the Southern part of Holland (Zeeland, Walcheren to be exact) and we need to travel to Amsterdam quite often. While the roadster should get there (220km) with it’s 350km range, we are curious how much energy we will be using, since it’s all highway (120km/h) driving.

In Amsterdam we will also create a 32A socket for charging the roadster, so that we can make the round-trip without problems!

I’ll keep you updated!

Make-kpkg fails due to a ‘+’/plus appended to the kernel version

This weekend i tried to compile a patched 2.6.35 kernel and wanted to install this on multiple machines. But it kept failing when the .deb files were created.

make-kpkg kept complaining that the kernel version, 2.6.35-rbd+ was not in the “control info”.

After some searching i found out this was due to CONFIG_LOCALVERSION_AUTO not being set.

Setting this to ‘y’ solved it for me, now my kernel compiled and got packed the way it should.

De eerste 500km!

Bijna 4 weken geleden heb ik een elektrische scooter gekocht, een Novox C20 (25km/h model) om precies te zijn. Waarom? Ik woon in Zeeland en daar is het in de zomer een drama om met de auto ergens te komen, laat staan parkeren. (Nee, het is echt niet een probleem van de randstad!) Maar ook omdat ik elektrische voertuigen leuk vind.

De afgelopen weken heb ik dus al aardig wat kilometers gemaakt op de C20 en dat bevalt eigenlijk prima! Het is opzich best raar, je pakt de scooter uit de garage en gaat rijden, tanken is niet meer nodig.

Het leukste zijn toch wel de reacties van de mensen om je heen, je hoort en ziet iedereen over je praten, want zeker in Zeeland heeft nog bijna niemand een elektrische scooter gezien. Ook bij een verkeerslicht blijft het leuk, je bent volledig stil, dus je mensen kijken je raar aan.

Een groter probleem is toch wel dat je érg defensief moet rijden, mensen gaan er nu eenmaal vanuit dat ze ander verkeer aan horen komen, dus fietsers zullen zonder te kijken links af slaan, inhalen zonder naar achteren te kijken en ook voetgangers steken lukraak over, ze horen je immers gewoon niet…

Dat blijft toch wel vervelend en soms ook érg irritant, soms lijdt het zelfs tot een boze reactie van mensen, maar dat is gewoon omdat ze erg van je schrikken.

In het begin had ik echter wel last van “range anxiety”, je denkt constant dat je accu leeg is, hij langzamer begint te rijden of dat je het gewoon niet naar huis gaat halen, terwijl dat allemaal tussen je oren zit. Het komt gewoon omdat ik er zelf ook nog niet helemaal aan gewend ben dat er geen geluid van af komt.

Het bereik is verder prima, de eerste dag heb ik samen met mijn vriendin er op ruim 70 kilometer gereden waar hij volgens het boekje 100 moet halen (met één persoon). Inmiddels rijden we regelmatig met twee personen er op zo’n 50 kilometer op een dag en dat haalt de scooter allemaal met gemak. Over landweggetjes met flinke wind, de duinen naar boven, het is geen probleem, ook niet met twee personen.

Het begint wel steeds meer te wennen, je komt thuis, prikt de scooter aan de lader en de volgende dag kan je er gewoon weer mee rijden, heerlijk!

Nu is het wachten op de Tesla Model S..

Het gaat goed met de aanleg van laadpunten

Recentelijk schreef ik nog een blogpost over het feit dat ik een Tesla Model S besteld heb, dit omdat ik zelf elektrisch rijden als de toekomst zie.

Echter woon ik in Zeeland waardoor ik automatisch veel kilometers maak, voor veel zaken moet je namelijk een aardig stuk rijden. De Tesla Model S, met zijn 450km bereik is tot nu toe dan ook de enige, echte elektrische auto die aan mijn wensen voldoet.

Een elektrische auto kan zéér gemakkelijk geladen worden, door deze simpelweg in het stopcontact te “prikken”, echter gaat het laden dan niet zo snel.

Daarom worden er door Nederland heeft op verschillende, strategische plaatsen oplaadpalen geplaatst.

Stichting E-Laad is een van de bekendste spelers op het gebied van het plaatsen van laadpalen, hun doelstelling is om in 2012 een 10.000 laadpalen in Nederland te hebben staan.

Echter zijn ze niet de enige, ook in Amsterdam wordt er door NUON hard gewerkt aan het aanleggen van laadpunten. Daar mag je zelfs al op de mooiste plekken gratis parkeren en laden!

Dit lijkt dus de goede kant op te gaan, het duurt niet lang meer of je kan met een elektrische auto prima door Nederland rijden.

Voor een compleet overzicht van alle laadpunten in Nederland, zie www.oplaadpalen.nl.

Tesla Model S, here i come!

I’m a fan of cars, to bad I live in Holland where cars are a pretty expensive hobby.

A few years ago Tesla Motors introduced their roadster, a fast full electric sports vehicle based on the Lotus Elise.

But then in 2009 they announced the Model S, well, after seeing the pictures and the specifications i was sold!

About a month ago I was in New York and I visited the Tesla showroom for a testdrive of the Roadster and I was fully sold!

And after doubting a long time i’ve finally faxed the form and made the deposit, i’m getting a Tesla Model S!

To bad I have to wait until 2012….

tesla-model-s-sedan

Nokia, shame on you..

Last november i bought a Noka N900, the reason for my purchase was because it ran Maemo which gave me the freedom to do with my phone whatever i wanted to (with some limitations ofcourse 😉 ).

I’ve been using my N900 intensive since then, using it the whole day to keep up to date with my work, manage some servers through SSH and keep in touch with Jabber Instant Messaging.

Really, the N900 is a great phone and even better when you like Linux as much as i do.

But there was a downside…. A few weeks ago (half April) my phone started to complain that my memory was full, so i couldn’t receive any more IM’s or SMS’s. When i opened a terminal and did a “df -h” it showed me that i was only using 23% of the internal memory. A reboot solved it, so i guessed it was a bug somewhere.

After a few days the phone started to reboot itself and kept complaining whenever i wanted to save something to the internal MMC memory, so i opened up a terminal and typed “dmesg”, well, then i knew what was wrong: The internal MMC memory was broken.

So i started to search the web and i found this thread: talk.maemo.org

It seemed i wasn’t the only one! I contacted Nokia (since i bought the phone from them directly) and they told me i could return it to “BelCompany” (A Dutch phone store) which would then return it for me to the Nokia Service Center.

And so they did.. After a week i got my phone back with the message: Software reprogrammed

Well, i didn’t think that would fix it and it didn’t. After 5 minutes of usage i opened a terminal again and i saw the kernel spitting out errors again about mmcblk0p2. So i went back to “BelCompany” and they returned it again to Nokia.

Guess what? I got my phone back again with the same message and it is still broken!

So i got a broken phone back from the repair center for the second time! I brought the phone back to “BelCompany” again and they urged Nokia to replace my phone with a new N900.

Nokia, shame on you! When i returned my phone to the Nokia service center i attached 3 A4’s with error message from the phone and ways you could reproduce the problem, but in stead you just reprogrammed the MMC and sent it back to me again. Really not the way to treat people when they pay EUR 599,00 for a phone!

To be continued..

How to turn off the Journal with EXT4

For a specific system i wanted maximum performance, so i tried of turning the journaling on my ext4 device.

It took me some time to find out how, so here is a small howto:

1. Unmount your EXT4 filesystem
2. tune2fs -O ^has_journal /dev/sdX
3. mount your filesystem again.

And voila! You have an ext4 filesystem without a journal.

Note: This works if you have a kernel newer then 2.6.28!

ActiveSync (Z-Push) sync with Zarafa and Nokia N900

Recently i bought a Nokia N900 and started right away with configuring my Exchange (Zarafa) account, but i didn’t work.

Syncing a mobile phone works via Microsoft’s ActiveSync, in Zarafa’s case this is implemented via Z-Push.

After making a post on the Z-Push forum i got in contact with Andreas (a Z-Push) and he found out what the problem was. Z-Push implements Exchange 2003 and the Nokia N900 requires Exchange 2007.

Andreas started working on some fixes and after a few days of mailing he made an alpha version which also support the Nokia N900.

At the moment i am running the Alpha in conjunction with my Zarafa envirioment and it works fine, so for all the other N900 users, help is on its way!