virtualdom

6 ms·

1.
by virtualdom 5y ago
To be more clear: the US grid with its existing generation capacity could certainly handle 41% of consumers switching to EVs. We would simply not ramp down as many power plants at night as we do now [1]. However, that would result in this a
2.
by virtualdom 5y ago
If half of American commuters switched to EVs, the daily energy demand on the grid would only increase by 10-15%. The difference between peak load and average load is close to 30%, so we could handle that new EV load with the existing gener
3.
by virtualdom 5y ago
You're right. There are two major errors in just this one paragraph from the article: "Worldwide, humans use roughly one zettajoule per year. Satisfying that demand without further contributing to climate change means we’ll have t
4.
by virtualdom 5y ago
This IEEE article makes some questionable extrapolations in my opinion. First, they start with 2017's global primary energy consumption of 600 PJ, and then round it up (by 66%!) to 1000 PJ ("for simplicity"). Then, 1000 PJ is
5.
by virtualdom 6y ago
You've compared the range of a Model 3 driven at 75MPH to a Camry driven at 48MPH, for one thing. But I don't know why you would bring passenger cars into the discussion, since you can't scale performance linearly from cars t
6.
by virtualdom 6y ago
> Independent testing of the Tesla Semi will prove or disprove all these claims. It sounds like you think it is fine to make claims that are unsupported by any evidence, or by basic logic, until a counter-example to your claims is physic
7.
by virtualdom 6y ago
A 600 mile battery - say 1-1.2MWh - should only weigh around 10-12K lbs (at 260-300 wh/kg). And you can throw out the 5K lb carbon capture device, and 5K lbs of engine, transmission, exhaust, cooling and fuel system. Add back 500 lbs o
8.
by virtualdom 6y ago
An aux heating system would not be necessary for an EV semi: most of the cited 40% of range lost suffered by passenger EVs is due to cabin heating, but an EV semi would actually produce enough waste heat in its powertrain to comfortably hea
9.
by virtualdom 6y ago
> we believe electrification won't work for long-haul trucking. Bill Gates agrees. is very different from > we ... think electrification is going to be trickier for long-haul trucking than for cars Electrification will be trick
10.
by virtualdom 6y ago
To answer my own question: Assuming 2KWh / mile average consumption[1], an EV semi powertrain would be pulling ~120KW continuously from the battery. Even at 90-95% efficiency, there will be 6-12KW of waste heat available in the powertr
11.
by virtualdom 6y ago
Thanks! From the corrected link: > At 20 degrees, the average driving range fell by 12 percent when the car’s cabin heater was not used. When the heater was turned on, the range dropped by 41 percent, AAA said. So the majority of the ran
12.
by virtualdom 6y ago
> plus the batteries lose > 40% of their range in cold weather [2] The link you cited does not mention cold weather range loss for batteries. Can you provide a source for this claim?
13.
Old Uber source code on NPM
16 points by virtualdom 12y ago|2 comments