Live data from Hacker News

EVs Are Essential Grid-Scale Storage

spectrum.ieee.org

51–60 of 260 posts

Re: EVs Are Essential Grid-Scale Storage

#51
If you're a consumer in the UK, and thinking about an EV, consider Octopus Energy's Go tariff: https://octopus.energy/go/. They also offer a salary sacrifice scheme to buy EVs: https://octopusev.com/, because this grid-supplementing storage is part of their offering, I think.

Concerns such as, "will my car be charged in the morning -- or for that emergency hospital run?" are considered, I believe, and you can set things like a "minimum charge" with smart chargers.

Re: EVs Are Essential Grid-Scale Storage

#52
post #23

Even if you completely do away with concerns of battery wear, I'd only be willing to participate in this as long as my household still had an ICE vehicle to fall back on. When I get home and plug the car in I don't want to have to think about whether I might want or need to leave the house at a particular time with a particular charge; I just want the charge to be as high as possible as soon as possible.

All you need is a ‘no selling electricity today please’ button.

Or "always leave me 150 miles of range".

Re: EVs Are Essential Grid-Scale Storage

#53
post #23

Even if you completely do away with concerns of battery wear, I'd only be willing to participate in this as long as my household still had an ICE vehicle to fall back on. When I get home and plug the car in I don't want to have to think about whether I might want or need to leave the house at a particular time with a particular charge; I just want the charge to be as high as possible as soon as possible.

All you need is a ‘no selling electricity today please’ button.

How do you know when it is safe to activate?

Re: EVs Are Essential Grid-Scale Storage

#54
post #45

Earlier quoted context omitted.

During most of last year prices in Europe were routinely over 300, 400 even occasionally over 1000 per MWh because there was an energy shortage. At the same time the prices can easily go negative if the conditions are favorable for renewables. It's not crazy to think that you would be paid to charge your car when there is an excess and then get paid a lot when there is a shortage. I don't know who would say no to thi…

My point is mainly that there are plenty of options available to stabilize grid prices that are way cheaper than using EV's. Europes energy crisis is temporary, over time the price fluctuations will go down.

which other options are feasible today outside hydro pumping?

Re: EVs Are Essential Grid-Scale Storage

#55

This is never going to happen at scale. Energy is fungible: one cannot compete on "quality" of energy, just on price, a kWh is a kWh and the provider with the cheapest energy will always win in the marketplace. So this means any EV owner looking to make a profit is competing against large scale industrial storage entities that: - have large mass and purchasing power, optimizing their battery purchasing and operationa…

My electricity cost currently is split around 1/3 generation (~10¢/kWh) and 2/3 distribution (~20¢/kWh). If the power from this scheme can avoid most of the costly distribution, eg. I use it directly in my house and neighborhood, then it’s an economic win. This would be true even if the centralized generation was free.

Re: EVs Are Essential Grid-Scale Storage

#56
post #10

Aren't people wary about using their very expensive car batteries for the grid? E.g. imagine you plug in your phone for the night, but instead of a single top up change it is now constantly discharging and charging again. Lifetime of pocket sized batteries is not too great even now, and in such scenario they will go bust 2-3 times faster, in year instead of 3 or so. Also discharge swings would be probably much bigger…

Luckily, any degradation can all be predicted ahead of time. A 60kwh car battery might cost $10k, and allow 2000 charge cycles. So each kwh cycled into and out of the battery costs 8 cents. So a smart algorithm can decide it's worth draining the battery back into the grid if the profit to be made is more than 8 cents. Buuuut ... Delaying charging till later is free. So another car owner's car might see on the futures…

People value things differently. You'd have to pay me way more than the 8 cents/kwh it cost me to use my battery. I'd want to be heavily compensated for the inconvenience of replacing the battery or car prematurely.

Re: EVs Are Essential Grid-Scale Storage

#57
This boils down to "There are lots of EV batteries, we can use them as storage!". It seems to ignore practical issues:

People drive during the day, and charge at night. So you could use EVs as a buffer during the night, but they still need to be charged. So EVs are still going to be a net energy consumer during the night, when you need the storage the most (no solar production).

I think the best course of action is to load shift charging of EVs and use it as "storage" in that way. Its an easy load to shed when needed, and an easy load to ramp up when renewables are plenty.

Re: EVs Are Essential Grid-Scale Storage

#58
Counter point, getting the resources for those batteries and building them has no small environmental impact - including carbon impact: https://www.theguardian.com/us-news/2023/jan/24/us-electric-...

> The US’s transition to electric vehicles could require three times as much lithium as is currently produced for the entire global market, causing needless water shortages, Indigenous land grabs, and ecosystem destruction inside and outside its borders, new research finds.

> It warns that unless the US’s dependence on cars in towns and cities falls drastically, the transition to lithium battery-powered electric vehicles by 2050 will deepen global environmental and social inequalities linked to mining – and may even jeopardize the 1.5C global heating target.

We definitely need to figure out grid scale storage. But I'm not convinced Lithium Ion batteries are the answer. And I strongly disagree with the idea that electric car batteries are the solution.

Arguing for car batteries to be a primary means of grid storage basically presupposes we fail to make the transition away from cars, which means we're committing to a much more difficult and expensive path to the carbon cuts we need to make.

Re: EVs Are Essential Grid-Scale Storage

#59

Earlier quoted context omitted.

Luckily, any degradation can all be predicted ahead of time. A 60kwh car battery might cost $10k, and allow 2000 charge cycles. So each kwh cycled into and out of the battery costs 8 cents. So a smart algorithm can decide it's worth draining the battery back into the grid if the profit to be made is more than 8 cents. Buuuut ... Delaying charging till later is free. So another car owner's car might see on the futures…

People value things differently. You'd have to pay me way more than the 8 cents/kwh it cost me to use my battery. I'd want to be heavily compensated for the inconvenience of replacing the battery or car prematurely.

Plus the reduced range between new and replacement.

Re: EVs Are Essential Grid-Scale Storage

#60
This feels gimmicky and fragile. If distributed / decentralized storage is required (sounds like a good idea overall) it is surely better to have stationary installations, with larger batteries and connectivity optimized for that purpose, not using the EV batteries currently developed for moving these two-ton exosceletons to random places... In fact you want to have the option to significantly reduce EV usage as other, more sustainable overall, mobility modes become available and/or popular.
Post reply on HN