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lolwhatitis commented on Samsung to Mass-Produce Solid-State Batteries for 'Super Premium' EVs   pcmag.com/news/samsung-to... · Posted by u/achow
lolwhatitis · 2 years ago
Presuming an 80 kWh battery and 80% efficiency:

80 kWh / 0.8 = 100 kWh

To charge in nine minutes:

100 kWh * 60 min/hr / 9 min = 667 kW

A 400 V DC setup is common for this sort of application, so:

667 kW / 400 V = 1667 A

How physically large do the cables and related apparatus need to be in order to deliver this sort of current? What sort of training and personal protective equipment will people need in order to plug and unplug these cables? (Hint: Arc flashes are no joke!) What sort of service would you need to order from the electric company to be able to power just one of these installations?

lolwhatitis commented on The Counterintuitive Physics of Turning a Bike (2015) [video]   youtube.com/watch?v=llRkf... · Posted by u/thunderbong
sideshowb · 3 years ago
Except at very slow speeds (walking pace) where I think there's a different mode of action: the bike is no longer self stabilizing and is staying upright more because of your own balance skill. At this point if you turn the bike left it does go left.

...I think. I've been wrong about bike physics before, so I could be again.

lolwhatitis · 3 years ago
Motorcyclist here. The physics are the same for bicycles and motorcycles, and yes, you have it correct.
lolwhatitis commented on Colorado Town Offers 1 Gbps for $60 After Years of Battling Comcast   techdirt.com/articles/201... · Posted by u/CrankyBear
thaumasiotes · 6 years ago
> it seems that there's one consistent criterion for something being a city: it must have self-rule and a certain amount of government structure.

What do you mean by self-rule? Singapore is autonomous, but that's definitely not the norm for cities. Almost all of them belong to larger states.

No US city has self-rule even at the level below the federal government. Washington, DC comes closest, but it is technically ruled directly by the federal government (in a manner that is not true for cities that belong to states). China has four "province-level" cities, but is generally accepted to have many more than four cities.

lolwhatitis · 6 years ago
Well, the concept of an independent city - that is, one that isn't contained within any county - does exist in the U.S.:

https://en.wikipedia.org/wiki/Independent_city_(United_State...

Of course, Washington DC could be considered one example, although the above Wikipedia link begs to differ because DC isn't a state. However, there are a few dozen more, most of which are in Virginia.

lolwhatitis commented on Google’s Rivals Gear Up to Make Antitrust Case   wsj.com/articles/googles-... · Posted by u/drkimball
drak0n1c · 7 years ago
A Google whistleblower today released internal documents and helped Project Veritas obtain camera footage:

> Google Exec Says Don’t Break Us Up: “smaller companies don’t have the resources” to “prevent next Trump situation”

If a single company believes they have the informational monopoly needed to control national politics, isn't that an admission of anti-trust liability?

https://www.projectveritas.com/2019/06/24/insider-blows-whis...

lolwhatitis · 7 years ago
From elsewhere:

> What matters is that the American people had better believe, almost to an individual, that the process was fair and there was no cheating. That falls not just on voting matters directly but on the attempts by the media, whether old or new, to skew results, to steer people and to play psychological games with them whether through some "AI" or via in-person interference.

> You have weeks, maybe a couple of months, before the window slams shut on this opportunity. Beyond that point all you're doing is packing powder into a tinderbox with a lit fuse.

> [Jen Gennai's admission] is flat-out, without question, the most-dangerous admission I've ever seen and a very high-risk predicate for outright dirty civil war within the next 18 months. It only takes 0.1% of the American Population to decide they'd had enough of this crap and are willing to spend their life. If that happens you suddenly have three hundred thousand people committed to destruction who are utterly convinced that they are staring down tyranny and are willing to do whatever they can to stop it. They will be uncoordinated, you have no way to know who they are before they act, and once they do you can only sentence someone to death for a murder once; the facts, whether you like it or not, is that all the rest are "free, and always will be."

lolwhatitis commented on US utilities have finally realized electric cars may save them   qz.com/1230297/us-utiliti... · Posted by u/prostoalex
blattimwind · 8 years ago
200+ A circuits in a residential home really makes a point for 400 V three phase (where the same load would be ok with a standard 63 A circuit, which is still a lot). [1]

However, when more and more people try to have fast chargers in their homes for EVs, then not only the residential installation poses a problem, but utilities would need to rebuild ~two layers of distribution to accomodate for a 100-200 % increase in residential power consumption.

[1] Not just because high currents are more difficult to handle properly, but also because you need a lot less copper.

lolwhatitis · 8 years ago
If you live in a subdivision built within the past couple decades, your electric runs underground, making it quite expensive to run a second or third primary phase. You also then need a three-phase transformer, which is considerably larger than a typical one-phase. Oh, and your service will be commercial/industrial, which typically comes with demand and energy charges that can be quite steep: https://www.northwesternenergy.com/docs/default-source/docum...

Dead Comment

u/lolwhatitis

KarmaCake day3January 23, 2018View Original