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Message
re: where will we get the juice for all these EVs?
Posted on 6/14/21 at 11:03 am to Darth_Vader
Posted on 6/14/21 at 11:03 am to Darth_Vader
Nobody on the left is smart enough to realize any of that.
Posted on 6/14/21 at 11:11 am to YouAre8Up
quote:Funny since the question was already answered as well as the OP's data being called out as incorrect.
Nobody on the left is smart enough to realize any of that.

Question is, are you smart enough to realize that?
Posted on 6/14/21 at 11:41 am to Korkstand
quote:
Actually Ford is marketing exactly that as a feature. It will essentially work like the home battery packs that several companies sell (Generac is one of them).
My point was that an EV battery is not a great substitute for a natural gas standby generator, at least not somewhere like Louisiana where hurricanes can knock your power out for multiple days. I am aware that current EV batteries are capable of powering a house with the use of an inverter. Although that requires some additional investment in disconnects, proper wiring setups, etc. (as does a Generac, obviously).
It’s definitely possible. I’m just not convinced it’s practical. If I have an EV and my power goes out during a hurricane, that’s going to make me want a standby generator more.. not less. Because I’m not going to want to drain my vehicle’s battery with no idea of when the power is coming back - and I’m going to want a backup method to charge my vehicle for the same reason.
Maybe it makes more sense in areas that don’t often see extended power outages. But I don’t think anything I’m saying here is particularly controversial.
Posted on 6/14/21 at 11:43 am to lostinbr
You’d be surprised.
Suggesting the “power your house” thing from the f150 is nothing more than a gimmick triggers the frick out of Korkstand.
Suggesting the “power your house” thing from the f150 is nothing more than a gimmick triggers the frick out of Korkstand.
Posted on 6/14/21 at 11:49 am to Korkstand
quote:
Very easy to find owner testing to verify. Here is a good one.
Not a very good one and when it's 77F and relatively dry that's not going to put high demand on an AC system. Even so you can see where it was drawing far more than 2kW during some of that. Now in a state where it will be 90F+ and high humidity those numbers will jump considerably, this what people with little formal education on thermodynamics and heat transfer systems fail to grasp. Humidity is an enormous factor on the efficiency and power requirements for an AC system, roughly 34% of the power consumed by an AC system in Louisiana goes into simply condensing water vapor into a liquid that is dumped onto the ground. And that's in an indoor system trying to maintain a roughly comfortable 63 - 65% RH, much worse for automotive systems.
quote:
Care to elaborate?
Do you seriously need an explanation of how limited the power capacity will be attempting to safely backfeed an average house from an EV with even the largest residential charging stations? The fact that 20% of the capacity is wasted right off the bat converting it from DC to AC? Using an EV in place of anything more than relatively modest generator isn't happening, certainly not going to run major appliaces or HVAC outside of a gas furnace.
Posted on 6/14/21 at 11:51 am to lostinbr
quote:
It’s definitely possible. I’m just not convinced it’s practical. If I have an EV and my power goes out during a hurricane, that’s going to make me want a standby generator more.. not less. Because I’m not going to want to drain my vehicle’s battery with no idea of when the power is coming back - and I’m going to want a backup method to charge my vehicle for the same reason.
Playing the scenario game is pretty tough for this because obviously there are infinite possibilities. And as the person who mentioned it earlier, I should probably add some additional color. If you only have 1 car and its an EV and you have no way to independently charge the car, i.e. solar, it probably wouldn't be the bets idea to run your whole house. But maybe even in that scenario you run your fridge, which the car could do for quite a while (I'm too lazy to do the math). Or maybe you give it a day only running critical load then bolt. Or maybe you have an ICE too and its filled up and you can haul arse and leave your EV running the fridge while you get out of the storms path. The ideal situation is enough solar to charge the car and run the house and have additional storage, but obviously that takes up some space that many don't have and its expensive.
The real point here is you have options. You don't HAVE to do any of this, but its a possibility. And when considering a back up generator, remember your beholden to your natural gas infrastructure. Which is traditionally more reliable but not infallible.
This post was edited on 6/14/21 at 12:05 pm
Posted on 6/14/21 at 12:13 pm to billjamin
quote:
And when considering a back up generator, remember your beholden to your natural gas infrastructure
A typical 12kW stand-by generator is wired with a minimum 1/0 AWG cable into the transfer switch and then into whatever house circuits it's feedings. A 12kW generator is a 100-amp service, not very much when even a small house today has a 150A service coming in. A 12kW generator is still far more capable than any EV right now, and far more economical in providing reliable power. A 12kW generator could run one AC unit, the fridge, a few rooms worth of lights and outlets, and not much more. Certainly better have a gas water heater.
Posted on 6/14/21 at 12:28 pm to Darth_Vader
quote:
10. So right now we usually have roughly 17 billion in surplus kWh produced each month. But if we convert to all electric as many want us to do in the decade, it will require over 93 billion kWh per month. How will we fill this shortfall??
Pump your tires up with more air and turn your AC to 78 degrees. We could also go back to living like it was 1880 but with electric cars and no refrigeration
Posted on 6/14/21 at 12:29 pm to Clames
quote:
A 12kW generator is still far more capable than any EV right now
Its much more capable then an EV because an EV doesn't generate anything. It's a storage only device.
Now, if we take that out of the equation and say you have storage and enough solar to charge and run loads during the day and run off the batteries at night, then the EVs battery pack is more than capable of supporting whatever loads are needed.
Posted on 6/14/21 at 12:30 pm to winkchance
Or increase generation capacity?
Posted on 6/14/21 at 12:31 pm to yellowfin
quote:
If there’s a demand for it someone will supply it
I’m sure the same thing was said about gas when they started mass producing vehicles
Difference is that government did not force the change, the market place desired the new tech on its own. They did not all of a sudden tax horses.
Posted on 6/14/21 at 12:31 pm to Darth_Vader
The same people that support all electric also despise mining
Posted on 6/14/21 at 12:53 pm to Korkstand
quote:
Not quite. A Tesla, for example, requires about 2kw to run the AC. That means it will lose maybe 5-10 miles of range per hour running the AC constantly. For comparison, an ICE might burn 1/4 to 1/2 gallon of fuel per hour idling with the AC on (obviously depends on engine). That means it will lose a similar 5-10 miles of range per hour.
The Tesla driver is now sweating because he left the house without a full charge since it was supposed to be a short trip, and had to shut off the AC when his app told him he was not going to make it to the nearest charging station without saving those 5-10 miles per hour running the AC.
Posted on 6/14/21 at 1:16 pm to BuckyCheese
quote:
And you would be wrong.
I see nothing in your post that actually disputes my interpretation of the data, outside of your conclusion.
quote:
As an experiment I tried cooling an Avalanche with a window unit when parked on jobsites
Interesting experiment but it is of zero usefulness in the conversation without giving the capacity of the A/C unit you used as there is no way to convert it to power usage.
quote:
And a window AC unit is not what most think of when comparing a EV's energy use to cooling a home. Is that what Tesla, or anyone else, is comparing energy use against?
In general, you are correct, but you miss the fact I used the less efficient window units for my exploration of the question instead of the more efficient (in general) home A/C units.
quote:
And a window AC unit is not what most think of when comparing a EV's energy use to cooling a home. Is that what Tesla, or anyone else, is comparing energy use against?
For our rough look at the validity of the 2kW claim I looked for a similar electric analog with modest efficiency. I didn't include the small efficiency differences between R134a and R410a. Electrical refrigeration is a mature technology and not accounting for the difference in designed pull downs the window A/C unit and the Tesla units are likely close enough in efficiency to make them a valid comparison for at least rough numbers. In terms of rough numbers I am talking about disputing Telas is incorrect on the order of kWs not
a few hundred watts here or there.
quote:
eta-How powerful are automotive air conditioners? Most sedans have air conditioning systems that can approach 40,000 BTU (3.3 Tons) in capacity. A typical 3,000 square foot house can easily be cooled by a 36,000 BTU (3 Ton) system.
You do realize I used a higher figure for the average car capacity than you did. I used 60,000 BTU which is the higher end that Google provided. Assuming your 33% lower figure of 40,000 then it makes the numbers and conclusion I came to stronger, not weaker. Using your number of 3.3 Tons the energy usage on full blast would only be roughly 3.4 kW. As you know mechanical A/C compressors do not run all the time in a car, they cycle on and off via a clutch. Using your number of 3.3 tons a mechanical car A/C compressor could be engaged a little over 50% of the time and still only average 2 kW of energy usage when converted to electrical A/C usage.
quote:
Cars need massive cooling capacity in order to quickly bring down the interior temperatures on hot days (easily 130 degrees F) to comfortable levels (70-75 degrees F) in a few minutes.
Again this is correct but it goes a long way to support my position. You suggest a car needs 3.3 tons to be able to quickly make this huge pull-down in a few minutes (I was more conservative than suggested 5 tons). If a car can produce a 65 degree pull down in a few minutes then it would take much less A/C capacity to keep it there. It is VERY clear that once pull down occurs the A/C load is MUCH lighter and using 5 tons and especially your 3.3 tons of maximum cooling capacity 2kW of energy usage for a trip of any length is reasonable.
There are at least a dozen smaller variables that even my dumbass can see but I think they are all pretty minor. I am not an ME and certainly not a EV A/C engineer but I can fumblefrick Google numbers with the best of them. Tesla quotes an average AC usage draw and despite the gut feeling of many (I was agnostic to the number going in) everything seems to support that is a reasonable average number. So without someone offering some other calculations or data points I would have to agree with their listed number, if follows the math I have done. Maybe we have an ME that has worked on mechanical and electric HVAC systems and can that can be more thorough and exact with the numbers?
This post was edited on 6/14/21 at 1:52 pm
Posted on 6/14/21 at 1:48 pm to Clames
quote:I actually had a similar thing just yesterday. We're on a mini vacation at a resort not far from our house. It was 95 ish yesterday, the "feels like" temp was over 100. We had stuff in the car, and I left the cars AC on 72 as we got there a bit early and figured we wouldn't be able to check on for 30 minutes. The plan was assuming I'd go back to the car in 30 minutes. Our room was ready early, so we went on in, and I forgot if left the air on. I was at 150 miles when we arrived at 1pm. At 6pm when I realized the AC had been on all day, I turned it off via the app, and it was at 142 miles.
Not a very good one and when it's 77F and relatively dry that's not going to put high demand on an AC system
I had lost 8 miles in 5 hours with Temps near or over 100 and the AC set to 72.
Posted on 6/14/21 at 1:53 pm to EA6B
quote:And how's that any different than the person who left in the ICE vehicle with the same "range" left with the tank low? He's going to have the same issue, and having to turn his AC off as well.
The Tesla driver is now sweating because he left the house without a full charge since it was supposed to be a short trip, and had to shut off the AC when his app told him he was not going to make it to the nearest charging station without saving those 5-10 miles per hour running the AC.
Again, the scenario used was being stuck in traffic and unable to move, so you're assigning an issue to the Tesla insinuating the gas powered vehicle wouldn't have the same issue, but it would.
Posted on 6/14/21 at 2:10 pm to Darth_Vader
quote:
Ok. Who will produce the roughly 76 billion kWh per month needed to makeup the shortfall EVs will create? And more importantly, how will they produce it?
According to this Reuters Report, we don't anticipate needing additional power generation to support EV charging until after 2030,but huge investments in generation are going to be necessary. If 80% of the cars on the road now were EV, it would increase overall electricity consumption by 10-15%.
Maybe some smaller modular natural gas peaker plants could add necessary capacity as a stopgap during the transition.
Posted on 6/14/21 at 2:23 pm to madmaxvol
quote:
According to this Reuters Report, we don't anticipate needing additional power generation to support EV charging until after 2030,but huge investments in generation are going to be necessary. If 80% of the cars on the road now were EV, it would increase overall electricity consumption by 10-15%.
I dealt with this in my napkin math post earlier ITT. I think @80% adoption we might be looking at more like a 24% increase in total demand but it would have far less impact on peak demand which is the most salient issue. Our overall demand has stayed rather flat for the last 20 years and we added an extra average 4% per year from 1960 to 2000 so aren't really looking at adding power production at an unprecedented level so it can be done without much fanfare. The most important thing on the local level is socially engineering people to spread out their charging through the night and not all plugin (or turn on) charging when the hordes arrive home at ~5:30 PM local.
Posted on 6/14/21 at 2:27 pm to madmaxvol
Nuclear would solve most of our problems.
We should have already been there, radical enviros fricked it up.
Its also the future. Micro reactors are already being produced.
We should have already been there, radical enviros fricked it up.
Its also the future. Micro reactors are already being produced.
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