ironhydroxide
@ironhydroxide@sh.itjust.works
- Comment on ASUS breaks your ROG Ally if you don't pay $200 for warranty repairs: SCAMMING COMPANY! 10 hours ago:
So they’ve already done the pegging, and are now just the Asus?
- Comment on who's tried it? what does it taste like? 12 hours ago:
This is a very good explanation. Yes, I dislike the taste of the juice of burned beans.
- Comment on who's tried it? what does it taste like? 12 hours ago:
I’ve tried many different kinds of coffee that people have sworn by.
If they weren’t 90% sugar, the burnt taste/smell overpowered everything else.
- Comment on who's tried it? what does it taste like? 21 hours ago:
IFF (if and only if) I were drunk enough already, only had Guinness in the fridge (don’t like the stuff anyways), and also had monster on hand (yeah I drink it instead of burnt bean juice), I would try this.
If it ever happens I’ll try and remember to post my thoughts.
- Comment on Elon Musk reveals Tesla software-locked cheapest Model Y, offers 40-60 more miles of range 1 week ago:
It is, especially when the choice that leads to that extra weight is less reliable, less efficient, and more costly. All things you don’t particularly want in a car
So let’s get back to the real discussion on how the packs actually work. Can you explain how a microcontroller is supposed to put cells in and out of the circuit?
- Comment on Elon Musk reveals Tesla software-locked cheapest Model Y, offers 40-60 more miles of range 1 week ago:
Not sure where you’re getting “one total massive cell” from anything I wrote.
Every pack is made of a bunch of smaller batteries. You can’t get 400v without batteries in series, from batteries that only make ~3v.
- Comment on Elon Musk reveals Tesla software-locked cheapest Model Y, offers 40-60 more miles of range 1 week ago:
Most packs have only 2 contactors. Not 2 per cell. The only way to have spare cells that are not in active use all the time is to physically disconnect the cells from the rest of the pack. The only way to do that is to have contactors at each “end” of the cell, or cell pack, that you want to switch in and out.
Car packs are ~360-800v nominal depending on the car/pack. To get to those voltages with the normal cells (~3.2-3.7v nominal)you need between 95 and 250 cells in series (wired one to another directly, all the power goes through all the cells).
Let’s do an example. The simplest pack possible. A 95s1p meaning 95 cells wired negative to positive in a single line. A contactor at each end to cut power to the car for safety.
This is the simplest pack. Also the lowest range and worst for cell wear.
So say you want to “double” the range? You “simply” build an entire separate pack, and drop it next to the first with it’s own set of contactors, right?
But in that case you have doubled the amount of interconnect bus in the pack(the wires to get the high current out of the battery), as well as contactors.
You could get to the same power storage (range and longevity) by making a 95s2p pack with one set of contactors.
So instead of 2 lines of cells, you connect each cell to it’s partner with a small piece of wire then connect that to the next cell in the pack.
This means you don’t need the extra long wire from the back to the front of the pack for the second set. The tradeoff is you can’t physically disconnect the second cells, but you don’t need the weight and complexity of extra contactors, and the long wire for second cell set.
So what’s the actual benefit of physically disconnecting the second set of cells?
When one battery dies in the 95s1p pack, the whole pack is useless, as all the power from the remaining 94 cells must travel through the one high resistance cell.
In a 95s2p pack each cell only has to take half the current of the entire pack (improving as got go up in parallel cells).
You would be able to run one 95s1p dead, then switch to the other and keep driving till that is dead. But the efficiency of that is actually less than you get if you just had one 95s2p you ran from full till dead.
So again, being able to physically disconnect some cells in the pack only adds weight, complexity, and risk.
The Tesla car with “less range” that can be “unlocked” is literally just a software setting that limits the charge/discharge voltage of the entire pack, not switching in and out battery cells physically.
So… As you said
It’s okay to be wrong.
- Comment on xkcd #2929: Good and Bad Ideas 1 week ago:
There is no pizza acceptable to eat with fork and knife.
- Comment on Elon Musk reveals Tesla software-locked cheapest Model Y, offers 40-60 more miles of range 1 week ago:
No. Handwaving a microcontroller doesn’t fix it unless you have two high current contactors per cell, and multiple intermediate busses and contactors, it’s not going to work.
That’s going to add a ton in transmission complexity, and weight, that doesn’t really benefit the battery at all. Along with the fact that cells should be balanced in wear and cycles. It just doesn’t make sense.
- Comment on Elon Musk reveals Tesla software-locked cheapest Model Y, offers 40-60 more miles of range 1 week ago:
No. The packs aren’t like flash storage where they have spare blocks to use when one block wears out. Essentially switching in something that wasn’t used at all before.
The cells are all connected physically, being charged and drained. They do not connect and disconnect cells when wear occurs. They have software limitations on how far to charge and discharge (at what voltage and c rating). Yes, a larger pack will last longer if the charge/discharge cycles aren’t as “deep”. But no, they don’t have spare cells just to cover wear.
- Comment on Elon Musk reveals Tesla software-locked cheapest Model Y, offers 40-60 more miles of range 1 week ago:
That’s… not how battery packs work
- Comment on What a deal 1 week ago:
This may be the only case of “you’ll own nothing and you will like it” that I can agree with.
- Comment on All the ways streaming services are aggravating their subscribers this week 1 week ago:
No, they know why, what they’re trying to figure out is how to easier detect and punish those who pirate for “stealing” their hard purchased profits.
- Comment on They say the opposite of pro is con right? 2 weeks ago:
Sounds more like a confession to me
- Comment on spite 4 weeks ago:
Penguins are rapey, one of the first to study and record penguin activity didn’t think "unlearned"people were fit to read such “filth”.
- Comment on Mona: Court rules women’s-only exhibit must allow male visitors 5 weeks ago:
God I wish.
The if, is if they frequent the racist bar. My point is that it’s more likely that they would frequent it, than not, thus the heavy lifting.
- Comment on Mona: Court rules women’s-only exhibit must allow male visitors 5 weeks ago:
That’s my point… it’s more likely that they are, than aren’t. Thus the “if they are going to the racist bar” is doing a lot of heavy lifting
- Comment on Mona: Court rules women’s-only exhibit must allow male visitors 5 weeks ago:
That if about the police chief is doing some heavy lifting.
- Comment on Elon Musk says his posts did more to ‘financially impair’ X than help it 5 weeks ago:
So you’re saying that it only took him this long to realize that saying “go fuck yourself” in an interview, about advertisers, was not taken well by those advertisers…
- Comment on Men Over Thirty, what's your opinion on getting the snip? 1 month ago:
As a person with 7 siblings… it is. And traumatic.
- Comment on So which budget printer to buy? 1 month ago:
Best budget printer is one someone is selling.
Buy it, then if you have to, upgrade it into what you need.
- Comment on A good policy to have 1 month ago:
A large distinction between that and refusing to work where you die.
- Comment on Men Over Thirty, what's your opinion on getting the snip? 1 month ago:
Never wanted kids. Wife agreed early on in relationship. 8yrs in got snipped mostly for risk mitigation with recent abortion laws. No regrets, even easier and less stress.
- Comment on Snikt 1 month ago:
Controlling magnetic fields he couldn’t physically move non ferrous metals, but he could sure cause a lot of energy to be dumped in due to induction. Essentially cooking wolverine, and then melting his adamantium into a pile instead of being bone/blade shaped
- Comment on This was the first result on Google 1 month ago:
Just swap the leads back and forth very fast
- Comment on Do bike tires increase pressure in summerm 1 month ago:
Look up the ideal gas law.
But even then your tires won’t explode due to temperature induced pressure change, unless you’re about to blow them up already when cold.
- Comment on Electric cars will be cheaper to make than gas vehicles but with much higher repair and insurance costs 2 months ago:
When compared with the cost savings, in my personal case, renting when I need a car to drive 100+miles, is cheaper than buying a more expensive ev, or paying for fuel in a gasoline vehicle.
The time is negligible as well when I compare the time I don’t spend at gas stations because I charge at home.
- Comment on Electric cars will be cheaper to make than gas vehicles but with much higher repair and insurance costs 2 months ago:
This is what happens when you can DRM every piece of the car. Tesla is being taken as a model, and it’s extremely anti consumer
- Comment on Automakers Are Sharing Consumers’ Driving Behavior With Insurance Companies 2 months ago:
I agree it should be codified, but have no hope that our fascist leaning lawmakers won’t gladly accept $$ from insurance companies and automakers to do what they want to do anyways.
- Comment on Automakers Are Sharing Consumers’ Driving Behavior With Insurance Companies 2 months ago:
Welp, time to disable OnStar…