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Young climate activist tells Greenpeace to drop ‘old-fashioned’ anti-nuclear stance
(www.theguardian.com)
this post was submitted on 30 Aug 2023
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EVs with VTG. Problem solved. More importantly, energy production (solar plus wind) and storage (batteries) are completely decentralized, which is a huge security improvement for the grid. It amazes me that a platform that is decentralized doesn't beat the drum for the same for energy production and storage.
Is there any more in-depth analysis to show how many EVs would be needed to make this feasible, how this would work with time of day use of power from commutes vs generation from solar power, how long the grid could stay powered this way, impact on consumers range, etc? I think the concept seems simple at first but would it actually be resiliant relying on just EV batteries? A cloudy week could see everyone run out of power, for example.
A single Tesla powerwall has 13.5kwh of usable energy. An average Tesla car has between 70-100kwh of usable energy. The average American home uses about 30kwh/day (https://www.eia.gov/tools/faqs/faq.php?id=97&t=3). There are about 141 million houses in the US. There are 275 million personal and commercial vehicles in the US. So there would be plenty of capacity once you replace a significant chunk of those vehicles with EV.
Cloudy weeks don't occur over large areas - if you look at solar or wind production over an entire county or state, for example, it varies very little (that's also the advantage of using both sun and wind - when one is bad the other is typically good). So the solution to intermittency is mass adoption.
I live in a 1000 square foot two bedroom condo. When it gets below 20° f, which does a lot during the winter, I have to use the auxiliary heat on my heat pump unit.
That's 7.5 kW.
So just to stay warm during the night, when solar stops working, I would need 3-5 Power Walls?
Get a better heat pump that doesn't need aux heat? I know Mitsu "hyper heat" minisplits advertise high efficiency to -10F.
Powerwalls are overpriced for their capacity. Grid storage operators pay ~$150/kwh for batteries, then I'd guess about the same for charging/inverter electronics. I also see EV West sells 3.5kwh Samsung batteries to average consumers for $700 (I'm sure they're charging a large markup as well).
Are you going to buy me a new heat pump?
Also why doesn't anyone make a hyper efficient central system? I've only seen those hyper efficient units as mini splits.
Are you going to replace my 2016 Sonata I spent $13k on buying in 2018 with a $55k EV with car to grid for me?
What happens if it's dark and cold for multiple days? I just can't drive because my car emptied out running my minisplits?
Lol. Was just offering suggestions you may have not known about. Off-grid isn't practical for many people who aren't willing make sacrifices just for the sake of it. Some people like the challenge and lifestyle. Renewable power plants are more efficient than residential. I think used Leafs can be pretty cheap, and even new EVs, solar panels (grid-tied), and more efficient appliances can save you money in the long run. Not sure if it makes sense to sell EV charge back to the grid (I guess it does if the price is right).
I've heard of some people on certain electricity plans overheat or overcool their house when electricity is cheap to save money (acting kinda like storage for when electricity is more expensive).
Nice to meet you MrFagtron An EV would be a much better investment than powerwalls but it’s hard to be specific on a case by case basis. Hope that helps MrFagtron.