Thank you for asking this question. I didn't understand the notation either

Man, thank you for writing floor(x/2) because I've been looking at the original post and didn't know what those silly brackets are supposed to mean.

Surprising how many people have never seen floor/ceiling notation.

We went through immigration four weeks ago and didn't get a stamp in the passport either.

There's probably an electronic (I94) record.

As far as I know, around 1,000 Euro / sqm is a good estimate for bringing a 200+ kWh/(sqm * a) house down to about 85-100 kWh(sqm * a)

What? I'm German. This is infuriating.

I now have to pay him and ask for an invoice just to experience this :-)

Hi,

I think Josh Doody might be the right mentor for you. He definitely offers coaching/mentorship sessions. Check out his writing & work here: https://fearlesssalarynegotiation.com/

Thanks very much. The website doesn't mention any technical mentoring but since you mentioned, I will directly write a mail to him and find out.

I'd have to say mostly sweets and cakes ;-)

In the investors call last week Tesla stated that the problem is at the Gigafactory with battery production.

Here's a link to a summary of conference call: https://www.reddit.com/r/RealTesla/comments/7ao4m0/conferenc...

That forum is quite anti-Tesla (as opposed to /r/teslamotors). The whole Tesla thing is quite controversial - lots of haters, lots of fanboys.

Best advice I can give you: Read what both sides have to say and weigh the arguments. Then just stick with the truth you've always believed in - it's what everyone does in 2017 ;-)

I just read the story of William Browder (putin's nonfriend) that's indeed what I ended up doing.

Thanks a lot for the report, I guess I misinterpreted what article said about which factory the problems were happening.

IMHO two things:

a) "fast charger" is a loose term and is often used for anything exceeding 20kW. Superchargers deliver up to 140 kW (split between two cars) or 120 kW (to one car). That's why Tesla/Elon sometimes refer to them as "level 4 charger", although the specification ends at level 3. Other manufacturers are now getting on that train with (according to specification) up to 400 kW

b) The notion of the "average electric car user" does not take into account that yes, people drive less than 80km per day on average, BUT they go on the occasional road trip. And they don't want to have a car sitting around just for road trips. They want one that can do both (commute & roadtrip). That's where the supercharger network helps

Not sure about the situation in the US. The bulk of the ‘fast chargers’ in the UK, mentioned above, are CHAdeMO (40-60kW, generally, though higher power are coming) and Mennekes (usually 44kW). This isn’t as fast as the Tesla ones, but it’s not 20kW either.

Initially ludicrous mode was not just a software update. You could get it on your (already delivered) MS P90D, but had to bring it into service. They changed a fuse and activated ludicrous mode in software.

Of course, today all Tesla P100D get built with that fuse already in place - so it's "just a software upgrade" today.

There's quite a bit of electrical magic going on for a fuse to be able to handle insane current bursts while retaining a good response time in case of a catastrophic fault.

IIUC the fuse is an electrically triggered explosive device. Badass, huh?

What's going on is that the current drawn while flooring a ludicrous vehicle is a largish fraction of the current that should cause an instantaneous fuse blow. A fuse that melts at a given temperature and heats up as I^2 R wasn't going to cut it. In the electrical distribution industry, you'd get a fancy circuit breaker with an electrical trip device and call it a day. This has two issues for Tesla. First, your average electrical trip device uses a current transformer, and those don't work for DC. Second, DC current is considerably harder to interrupt than AC, and the current the fuse needs to carry is in the kA range (I have no idea what the short circuit current is), so a circuit breaker would be rather large. Hence a fuse, with a little explosive inside, with an active circuit, presumably using a Hall effect sensor, the voltage drop across the fuse, or maybe just a reed switch.

(Hmm. It's nice when fuses and such don't need external power. I wonder if there's sufficient voltage drop across the fuse during a fault to power the circuit that blows the fuse? I bet there is. It could even be a very simple circuit like a Zener diode in series with a resistive heater that sets off the explosive.)

Explosives in high current fuses is interesting, but not new or specific to Tesla. https://youtu.be/yTdngnsyNSE

I think that's the other way around. The fuses in that video trigger a tiny exclusive as a side effect of blowing. IIUC Tesla'a fuse blows because an explosive is triggered.