There is 400 amp residential service you can get 80 amp 19.2 kw level 2 chargers.
You would need 5 80 amp charger to approach 100kw but with other loads in a large house, I have seen large HVAC systems and elaborate pools with lazy rivers etc that can add up very quickly which is why they had 400 amp service.
100kw isn't really that much, a modern EV can put out 3 times that from its battery pack into the motor for short bursts and easily sustain 100kw until drained.
480v 200 amp 3 phase commercial supply can provide 100kw continuous and would be some thing used in a medium sized office building.
A watt of power multiplied by a second of time has an agreed upon name called joule, but a watt second is also a perfectly valid SI name.
A watt is a joule of energy divided by a second of time, this is a rate, joule per second is also a valid name similar to nautical mile per hour and knot being the same unit.
Multiplication vs division, quantity vs rate, see the relationship? Units may have different names but are equivalent, both the proper name and compound name are acceptable.
A watt hour is 3600 joules, it’s more convenient to use and matches more closely with how electrical energy is typically consumed. Kilowatt hour is again more directly relatable than 3.6 megajoules.
Newton meter and Coulomb volt are other names for the joule. In pure base units it is a kilogram-meter squared per second squared.
So when I torque all 20 of my car's lug bolts to 120 n-M, I've exerted 2/3 of a W-h? So if it takes me 4 minutes, I'm averaging 10 watts? That's neat. I wonder what the peak wattage (right as the torque wrench clicks) would be; it must depend on angular velocity.
Newton meter as a unit of energy is not the same as the newton meter unit of force for torque.
The energy unit meter is distance moved, while the force unit meter is the length of the moment arm.
This is confusing even though valid, so the energy unit version is rarely used.
You can exert newton meters of force while using no energy, say by standing on a lug nut wrench allowing gravity to exert the force indefinitely unless the nut breaks loose.
Ah! I guess that explains the "f" for "force" in the imperial abbreviation "ft-lbf", to distinguish it from work. I wonder if there's ever been an analogous variant for metric such as "Nmf"...
It seems the common thread is that the f means to introduce G, but not exactly. In my own research, the AI summaries are about as sloppy as I've ever seen, due to the vague and often regional differences (with the difference between ft-lb and lb-ft sometimes being described as relevant, as well).
You must still commit the WAL to disk, this is why the WAL exists it writes ahead to the log on durable storage. Its doesn't have to commit the main storage to disk only the WAL which is better since its just an append to end rather than placing correctly in the table storage which is slower.
You must have a single flushed write to disk to be durable, but it doesn't need the second write.
The acid in lead acid is sulfuric acid and if overcharged vents hydrogen gas, thats why they need a ventilated space typically. Sealed lead acid have safety vents that might pop if enough pressure builds.
They are most certainly not inert, they just have well established safety and charging protocols and are not used in very high quantities together because of their low energy density and cycle life.
LFP batteries which have iron phosphate cathodes are very stable compared to colbalt based batteries that tend to have catastrophic failures due to overcharge causing cathode failure. LFP have higher cycle life and are cheaper and typically whats used for storage and application where the loss in erergy density is not a big deal.
Hardly anything unless in a major city, no way to easily tell if there is any coverage other than randomly clicking until it shows, also doesn't tell you the date taken.
Google street view has the 2d overlay letting you know where there is coverage, shows the date taken along with previous imagery, and they have coverage nearly everywhere in the US at a least, although some of its pretty old.
Apple Maps does seem to have more up to date satellite / aerial imagery though.
Hard to overstate how valuable all that street view coverage is on the Google side.
My little Swedish village has full Look Around coverage, and clicking on the ⋯ icon shows an “Imagery” menu item that tells me the month and year the coverage was last updated. I think you’re underestimating where they’re currently at.
In the US is has basically zero coverage outside any major city. Google on the other hand has exentiqive coverage into rural areas, albeit some of it old, at least its there, where it has newer coverage it usually has multiple one at different times allowing one to look back in time as well, very useful.
I just double-checked my village. Every single road and cul-de-sac that I could find, with no exceptions, has full coverage on Apple. Google on the other hand, has coverage for maybe 50-55% of the roads. The worst example is a residential area on the outskirts where they’ve driven the car in, down one side-street, then given up and gone home.
On the other hand, they do have historical coverage, have to give them that.
In areas with partial coverage Apple Maps has basically the same overlay showing where Look Around is available. It just doesn't have a great indicator as to why the option is greyed out when there's no coverage.
I mean in Google Maps you can drag the little man over the map and it has a map layer that highlights all the roads available, so you can easily see where it is and is not. Not randomly picking a point and seeing if indicator is available.
Unless amelius is stronger than you, or has better weapons, or commands a gang that is bigger than your gang, then you can't stop them.
Its almost like you need some sort of power structure with the monopoly on violence to enforce agreed upon freedoms, they could be called the "government" which enforces "laws".
>government will form from a power vacuum made up of whoever has the most physical power around you.
Yup! My issue with the current system is that The Powers That Be pretend to act in the interest of their subjects(or, actually my issue is that people believe it) instead of being a gang of thugs imposing their will.
Round trip efficiency would be very poor, looks like thermal storage is around 75% efficient for the heat then the heat engine (turbine) maxes out around 45% so maybe round trip 33% efficiency if you lucky.
So that gives you around twice the wh/kg but you must keep the heat energy for the entire voyage which is constantly being lost once the onboard storage is heated up. Not sure what that look like I imagine it would be difficult to keep lithium hydride at 680C very efficiently or safely in an ocean going vessel for any length of time.
> looks like thermal storage is around 75% efficient for the hea
That seems unreasonably low. Thermal losses can be made arbitrarily low with insulation, and this is fairly large scale, so insulation can be thick and volume per surface area can be kept low.
Would love to see any data you have, what kind of storage tank on a ship could keep 680C lithium hydride insulated without significant losses for say a 30 day voyage?
We were talking about a 180 hour battery (7.5 days), not a 30 day battery.
But back of the envelope: 2.7 GWh of heat in LiH at 4 MJ/kg and 820 kg/m^3 is a sphere 9m in radius. If we put a 1m layer of microporous silica insulation (conductivity ~0.03 W/mK) this gives a thermal time constant of 300 days.
Sorry I was considering a standard container ship voyage at 30 days.
A 9m sphere of 1m thick Aerogel will probably cost above $500k just for the material.
Also lithium hydride itself reacts violently with water, not sure if you want to have a 9m radius 5 million pound sphere of it on a water vessel, this is the "safely" part.
They all have issues mainly the banks want constant reauth two factor rather than just trusting forever.
Mint was better they had their own connection supposedly and now that’s gone but wasn’t an open api.
I get the feeling banks don’t want this sort of thing and are fine making it annoying to use
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