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Messages - etienne

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Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: October 15, 2017, 09:31:40 AM »
I am still wondering what the business model should be for car batteries loading. I wonder if it would not be possible for local administrations to put cheap low power car batteries loader for example on street lightning poles.
Fast loading is nice from a technical point of view, but is not so good for the grid.

Policy and solutions / Re: Oil and Gas Issues
« on: October 11, 2017, 10:32:09 PM »
I had to fill the tank of the BMW 3i yesterday at work, and I was able to put like 6 liters, or 1,5 gallon in it. When paying, you feel like you bought gasoline for the lawn mower.
On that car, the gasoline motor is a range extender that produces electricity to reload the batteries. It's not so easy to have a smooth drive with such a car, so I used the cruse control.

Policy and solutions / Re: Oil and Gas Issues
« on: October 11, 2017, 01:25:34 PM »
I heard one mention that the cost of producing US shale oil might be lower now due to some technological improvement, but haven't seen anything detailed.  If so, we should see the price ceiling drop a bit  lowerer.

I read somewhere that price drop was more due to accepted reduction of incomes, we could also think that with a flat growth, there is no need to train new employees, which also reduces costs.

Could you also define PHEV ? Thanks.

Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: October 08, 2017, 09:33:47 PM »
I wouldn't be so pessimistic for the Africans oil producers... they will also enjoy renewable energy and maybe local gerillas won't have enough money anymore to buy weapons, corruption might be reduced...

Also in Ecuador, they also have a lot of solar potential, and I'm not sure how much normal people get something from the oil incomes.

Policy and solutions / Re: Grid data and energy balance.
« on: October 08, 2017, 05:42:06 AM »
Interesting comments about DOE grod study recommendations

Here an excerpt regarding subsidies.

Subsidies – Every type of energy resource today receives some type of support or subsidy.  Oil and gas get depletion allowances, renewables get production tax credits, investment tax credits and R&D, nuclear generation gets insurance, R&D and construction work in progress, natural gas gets depletion allowances and R&D, and so on.  But new subsidies for coal and nuclear plants won’t level the playing field relative to renewables nor undo the impact of old subsidies – they’ll just make the playing field even bumpier.

Any new subsidies – including direct state payments, out-of-market uplift payments, or potential cost-of-service payments for non-competitive resources -- should have a specific purpose and a limited duration.  As renewable PTCs end, Congress and regulators should consider also ending old subsidies of traditional resources insofar as they are based on outdated assumptions about the unique role and value of these resources.

Policy and solutions / Re: Batteries: Today's Energy Solution
« on: October 06, 2017, 05:01:21 PM »
Did anybody already heard of the ?

I found a reference in the renewable energy trend.

Sound too good to be true. I heard that the hydrogen was a byproduct of water batteries, so I am a little bit surprised.

Policy and solutions / Grid data and energy balance.
« on: October 06, 2017, 09:16:28 AM »
I found that I was often a little bit out of topic in the renewable energy topic, so here is a new topic to talk about grid and energy balance.

You will find below the graphs I made per month from the Swiss load curve and I added the cost of the equilibrium current in Luxembourg.

Data come from here :

Here are the other links that have been shared in the renewable energy trend. Sorry for not giving each time who is the "owner".

Policy and solutions / Re: Renewable Energy
« on: October 05, 2017, 10:41:12 PM »
Batteries work incredibly well. The question is more what kind of infrastructure should be used, more centralized like Tesla's mega project in Australia, or a network of batteries like in the Orkney Islands.

The network is probably more expensive to organize, but some costs can be supported by the owners of the buildings where they are installed and electricity transport lines could be reduced to the power needed to load the batteries.

Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: October 05, 2017, 10:31:41 PM »

With current auto sales in the U.S. running at about 17 million cars per year, it calls into question whether electric vehicles can replace internal combustion vehicles anytime soon.

There is a very interesting video to watch about disruptive technologies with many interesting examples. I don't agree with all his ideas for the future, but past is real and shows us that things can change very fast.

Policy and solutions / Re: Renewable Energy
« on: October 04, 2017, 07:00:40 AM »
I believe that French nuclear reactors have reached the age where maintenance starts to be expensive. Many are above 20 or 30 years old. Like somebody said, it's in the 70' and 80' that nuclear reactors were growing like mushrooms in the countryside.
Average age was 28.7 in 2013.

Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: October 03, 2017, 11:22:59 PM »
If you don't agree with my point of view, I'd be very happy if you would explain me what's wrong in my way of thinking because many people are surprised by my point of view, find it interesting but prefer to use their power in order to be sure that they don't use "greened" electricity.

Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: October 03, 2017, 11:13:10 PM »
I was surprised to see there still isn't a solution for this, having read about it years ago (probably on Jim's V2G blog). I don't see us using more than 5 kWh per day that isn't supplied by our PV array (it would have to be really, really cloudy), so I would guess that a 40 kWh battery shouldn't have a problem with that.

This is a little bit out of topic, but from my point of view, thinking CO2 reduction, I feel that it doesn't make sense to use PV power to load a car.

In the renewable energy trend, there are many links to electricity load curves, and the summer daily PV production curve is similiar to the global electricity consumption curve, so if you use the electricity produced before noon to load your car, maybe somebody else starts a diesel generator in order to support the peak load.

The Californian spring and fall load curve is often discussed, they have what is called a duck curve  because of the PV production without much air conditionning use, but in the summertime, from what I heard, it seems that it isn't an issue.

So from a CO2 reduction point of view, I would recommend a slow charging of the car batteries at night between 00:00 and 5:00.

Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: October 03, 2017, 06:16:33 PM »

Sometimes I think about converting our Opel Combo CNG to EV, as that would be the most environmentally friendly option (and I don't like all the software in EVs, which I suspect, will turn out to be planned/perceived obsolescence), but again, a very expensive experiment that could go terribly wrong.

Did you already do more than thinking about it ? I wonder what the costs might be but don't have time to inform myself.

Right now, I wouldn't take electricity out of the car into the house, batteries are not done for that, but as a variable load on the PV system, I think it's a good idea.

Policy and solutions / Re: Renewable Energy
« on: October 03, 2017, 06:08:56 PM »
France's wholesale cost of electricity is 29.5 euros/MWh  (Q1 2016).
Not today.

For 10/4, the price is 51.95 and in Germany 28.65.

Policy and solutions / Re: Renewable Energy
« on: October 02, 2017, 10:08:58 PM »

Policy and solutions / Re: Renewable Energy
« on: October 01, 2017, 04:58:11 PM »
The curve looks differently from what I have seen from California, maybe Switzerland has more industrial activity.

California AC for cooling versus need for heating provided by oil/gas in Switzerland?

Yes, cooling might explain why the Californian curve doesn't go down in a summer evening. Switzerland has mainly cooling in offices and IT rooms, one ends probably around 5PM, and the other one is very stable.

Modification : Switzerland has a lot of electrical heating. This might explain the second peak in the winter evening => cooking + heating. With normal electrical heating, it is quite easy to adapt the temperature of the room to your need, which means less heating when at work.

Policy and solutions / Re: Renewable Energy
« on: October 01, 2017, 04:13:38 PM »
This is a little bit out of topic, but I didn't find an "electricity" topic.

Swiss grid is nice enough to provide many data do download :

From these data, I was able to do load curves (see attach document, always 14 days average, which means 2 weeks). There are some interesting things, for example that there are 2 peaks in winter (noon and evening), but only 1 in the summer (noon). The curve looks differently from what I have seen from California, maybe Switzerland has more industrial activity.

Policy and solutions / Re: Renewable Energy
« on: September 30, 2017, 09:03:58 AM »
Thanks for the info, it's very interesting.


Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: September 30, 2017, 08:59:48 AM »
The problem right now overhere is that each utility company has its own card for the EV loading device, so if you are somewhere on holiday, you first have to find the place to buy the loading card, and if it is not a prepaid system, it's even more complicated. Some kind of credit card solution would be fine, just that credit card companies don't allow you to charge any cost on a credit card transaction.

Policy and solutions / Re: Renewable Energy
« on: September 29, 2017, 07:06:29 AM »
Well, the situation is a little bit different above 66°N because :
- diesel is very expensive to bring
- there is no grid to take any peak load
- during the summer, you have 24h/day sun (if there is any).

So I would imagine to have panels in different directions, at least south, east and west, or a rotating system, in order to have a longer coverage of the needs by the solar panels.

Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: September 28, 2017, 07:55:53 PM »
The main difference will be that you won't "fill the tank" near your home. You would need such a loading device mainly on holidays/business trip.

The issue that is not clear yet is how to load your EV if you live in an appartment building without garage or private parking lot, or if the part owners of the appartment buiding don't want to invest in EV loading devices. But if you are is such a context, would you really line up in front of an "electrical station" ?
I could imagine 2 solutions :
1) a parking lot with expensive places with EV loader (you would pay the parking time and the loaded kWh) and normal priced places without loader.
2)  a business where you bring your car and take it back later with a fully loaded battery. This could be done for example on an empty supermarket parking lot at night. During the day when people go shopping, it would be self-service paid by credit card, and at night somebody would change regularely the cars in front of the loaders (or would move the loaders in front of another car).

With self driving cars, none of this would be an issue because cars could line up and wait to be loaded.

Policy and solutions / Re: Renewable Energy
« on: September 28, 2017, 06:40:03 PM »
Do you know in which direction and with what angle panels are placed so far north ? I would imagine some kind of rotating system, going around once a day.

Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: September 28, 2017, 07:07:59 AM »
First look at Shell’s new electric car charging stations being deployed at its gas stations
Earlier this year, oil giant Shell announced that they would start deploying electric car charging stations in Britain and the Netherlands.
Interestingly, they branded the station ‘Shell’ and they made it look a lot like gas pumps.

It features 3 ports for maximum compatibility: a CHAdeMO DC fast-charging port, a CCS DC fast-charging port, and a regular Mennekes (Type 2) port.

They are charging £0.25p/ kWh ($0.34 USD), which isn’t too big of a premium on local electricity rate, which ranges from £0.09p to 0.16p/ kWh in the UK.

But it’s still higher than what some drivers will want to pay. In comparison, Tesla’s Supercharger rate for the UK is currently listed at £0.20p per kWh.

Shell and Allego are talking about increasing the rate to £0.49p next year. If they do, it would render the station completely useless. Hopefully, they reconsider that. ...

I wonder if this would work. I would have tried a deal for example with a fast food restaurant. But in the article, they say that they want to keep the shop in business when gasoline business ends.

Policy and solutions / Re: Renewable Energy
« on: September 28, 2017, 07:01:08 AM »

The hamlets of Arviat and Kugluktuk have decided to work on new clean energy projects to reduce diesel use.

If all goes well, solar panels will be set installed in both communities by late fall of 2018, a move that will see diesel use, and thus carbon emissions, displaced by about 15 per cent.

And they're looking at wind next to get to 50% reduction. The article says the contractor "has developed a storage technology" -- not sure if that means there'll be batteries.

It would have been better to install everything in the spring, but I guess they need the summer for delivery and installation work.

Policy and solutions / Re: Oil and Gas Issues
« on: September 27, 2017, 04:59:45 PM »
In French about peak oil :
Two surprises for me in this video :
- peak oil doesn't seem to be a worry, the only problem would be investments. One of the speakers believes that investments are done, the other one not and he believes that prices would go up around 2020 and this would create an economical crisis.
- climate change doesn't seem to be an issue.

Otherwise, both believe in energy transition, but one sees renewable as an extra energy, the other one talked about 100% renewable, but in a long time.

I have to say that I am surprised that production continiues to go up, and I find it very difficult to find recent charts making the difference between conventional and non conventional production.

According to this site, conventional oil production doesn't grow anymore.
People used to say that conventional oil production peaked in 2005. I wonder what is the reality.

Walking the walk / Re: Managing PV + battery system
« on: September 27, 2017, 03:10:00 AM »
We are now preparing the concepts for new houses and it's unbelievable how things have change on the last years. It is now possible to find plug and play solutions for PV electricity use optimisation with a heat pump. And is is cheap (like around 500 EUR). Since suppliers have full control of their systems, the plug and play solutions might be more efficient than what can be done with the normal public interface. Configuration is more complicated, but Microsoft has developped the installation wizard concept, I guess this also works here.
With the batteries dropping costs, I wonder if PV optimisation will be an issue in the future. It will be possible to increase the battery size and optimize energy use, not just PV energy use.
Furthermore, heat pumps are also improving quite a lot, and I guess it will soon be interesting to use them for normal houses (not only highly insulated) if you add a pellet stove to bring enough heat for the winter months.

Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: September 26, 2017, 06:36:16 AM »
Most electric buses being made today have batteries that give a range over 100, even 200 miles (320 km). That's more than enough for a day's worth of intercity routes.

Thats a good point, a local bus doesn't go very fast, maybe 15 miles per hours on average. Even on a 24 hours timeframe, this would be like 360 miles. Problem might come from heating and cooling because doors open every half mile, and when the bus is full at peak time, humans create a lot of heat, I have in mind around 100 W per person, but I'm not sure.

Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: September 25, 2017, 05:46:06 PM »
The picture is from Luxembourg. I am not convinced from what I heard about these busses. The problem is that the loading time would be around 8 minutes, and loading would have to happen more than once per trip, like once at the beginning and once in the middle. When there is an easy solution called trolleybus, I don't understand why such investments are done, the argument is flexibility, everything should be wireless nowdays. The trolleybus has as second advantage which is that the load on the network is more regular.

Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: September 24, 2017, 06:52:21 PM »
How about the desires of your customers?

VW chief: Diesel engines have “a great future”
Volkswagen CEO Matthias Mueller rejected predictions of diesel’s demise, saying that the diesel engine has “a great future” ahead of it.

“The diesels we are offering today are clean,” Mueller told CNBC at the recent Frankfurt Motor Show. “They comply with the Worldwide Harmonized Light Vehicle Test Procedure requirements, and they meet the requirements and needs of our customers.”

Speaking through an interpreter, Mueller said that VW will continue to develop diesel cars. “There’s going to be a co-existence between combustion engines and electrified drive systems over the next 10 to 20 years, so against this background we should all be patient and relaxed and leave the decision to our customers. They should decide which concept they prefer.”

Mueller acknowledged that some jurisdictions have been talking about banning diesel engines, and said it is the responsibility of the car industry and governments to make sure that doesn’t happen.

Well, that's a great news, in 10 to 20 years, VW will stop producing diesel engine. That means that they plan to stop production more or less around 2030, which means when countries plan to forbid their entrance on the market.

Policy and solutions / Re: Carbon Capture and Storage (CCS)
« on: September 24, 2017, 08:13:41 AM »
I see again  an idea which has come up before, deeo ocean CO2 storage as liquid (which is stable  in the deepest parts of the ocean.) When i last thought about this i was worried about tectonic instability returning the deep CO2 pool to the atmosphere, but the author does not seem to address that issue.
Interesting idea.
I'm new on this topic, so I hope I will be able to say something that make sense. I wonder if the concept of CO2 storage as liquid really make sense. Capture and reuse is great, because it avoids creation of new CO2; or if you rebuilt the carbon chain, it avoids the use of fossil fuels. Furthermore, you get a final product that might be sold in order to cover a part of the costs. If you do just storage as liquid, you have no possible income, and storage has to be monitored to make sure that you don't create a bigger catastrophe.
I would prefer solutions that increase CO2 absorption, for example by concrete walls, is also welcome because we still have a chemical situation that is stable, and I can imagine that this could be an easy and cheap process.

I have to say that creativity is needed. So it is good to have all these ideas so that maybe somebody will come out with some better solutions. I see this a little bit like a world wide brainstorming, but from a technical point of view, I can’t imagine that it would be cheap to put CO2 under enough pressure to have it liquid, than to find a way to bring this CO2. Furthermore I wonder is if liquid CO2 doesn’t mix with liquid water. I don’t know.

Policy and solutions / Re: Renewable Energy
« on: September 24, 2017, 07:38:36 AM »
I have no idea why the tunnel was built. You could be right because I don't see any other use for the tunnel. Last time I travelled by train in Switzerland, I found sad that on some parts of the journey, mainly when the train was on high speed tracks, you couldn't see the landscape because of all the protections around the tracks.

Policy and solutions / Re: Renewable Energy
« on: September 23, 2017, 10:05:57 AM »
Did anybody hear of the solar tunnel over Belgian railroads ?
About the solar installation:

    Location: Antwerp - Belgium
    Completed: September 2010
    PV-installation: roof, flat, ballast
    System size: 4 MW
    Roof area: 50.000 sq.m.
    Number of solar panels: 16.000
    Energy production: 3.300 MWh
    Energy production equivalent of: 950 families
    CO2 reduction: 2.400 tons

Walking the walk / Re: Managing PV + battery system
« on: September 22, 2017, 02:18:41 PM »
The building was finished in July. From 4 owners, only one has fully moved. Two owners are still between their old and new appartment, and the 4th owner is looking for a tenant. So I can't give real conclusions yet.

None of the owners/tenant has an electrical car. Probably in the future. Infrastructure will be easy to install, but is not required yet. The problem with EV and PV is that cars are on professional parking lot during the day.

Carbon calculation is not an issue in this project. Our part of the work is energy management, so we don't have a choice regarding the other aspects. It's nice for us when people are ready to buy batteries because with the actual regulations in Luxembourg, it is a "just for fun" investment. I believe that it will change in the future, but not before 2-3 years.

In the "policy and solution/renewable energy" trend is a nice link from ghoti about what could be done anywhere if the network regulator would be ready (its in the Orkney Islands):
but it requires a lot of work on the network regulator side.
Imagine what would happen if the regulator just says he has too much electricity so it is now 20% cheaper. On the building I manage, I can start 12 kW load just on water and buiding heating, but in each appartment is a washmachine, a dryer... It would create a total breakdown of the electrical network.
The PV/battery management system we have allows us to define different loads that can be started with different priorities. So I guess the network regulator could do the same thing, homes could enroll in a project, define what their extra load could be, and the regulator should be able to start them.
In the Orkney project, they solve that problem using the batteries as variable load. I guess that the end users pay always the same price for electricity, so they won't start all the systems together at the minute where it becomes cheaper. Since the utility company knows the load curve of the house, it is able to fill the batteries whenever network and electricity are available and can empty them when there is no load in the house and electricity is expensive. I guess that there are some additional requirements like heating sanitary water at night.
With the renewable/storage revolution, I believe that utility companies won't make so much money on electricity anymore, but on energy management. It's a new business case.

Policy and solutions / Re: Renewable Energy
« on: September 21, 2017, 02:28:33 PM »
Excepted when there is no other choice, I don't think that it is a good idea to install batteries off-line. Maybe it would be smarter to load the batteries at night and to sale the PV electricity during the day. Furthermore,you have sometimes days without wind and without sun.

Electrical network is also good to optimize battery loading and unloading, so you can install more PV power than what the battery can load, and can use more electricity than what the battery can give, so it reduces inverter costs.

Walking the walk / Re: Managing PV + battery system
« on: September 20, 2017, 06:37:52 PM »
Maybe I should add that the systems installed to use PV power in excess aim to anticipate needs of energy during the time where there is no sun. For example when I overheat sanitary water with PV power, I anticipate the next heating process that might happen when no PV power is available. It's not a waste of energy, the waste comes only from the increasing losses due to higher temperature in the storage tank.

We will have a winter and a summer configuration, because for example during the winter, it could be interesting to heat sanitary water at night when electricity is abundant on the network.

Walking the walk / Managing PV + battery system
« on: September 20, 2017, 01:43:01 PM »
At work, we just started a PV (20 kWp) + Battery (15kWh) system on a building with 4 appartments  that have heatpump heating (well, appartments are only half full yet), and I have to say that it works better than what I expected. Even now mid September, on rainy days, we have enough electricity until like midnight (heating is only needed for sanitary water yet).
A lot of sun doesn't help much because batteries are full around noon, so we start to use extra tips to use PV electricity in excess.
I started the "what to do with PV electricity in excess topics,2076.0.html when the conception of the regulation was underway. It seems to work fine.
Since most ways of using excess PV electricity are not so efficient or mean higher energy loss (an overheated boiler has over average heat loss), I decided to stop any not needed electricity use during peak hours (around noon and after 16h) in order to support the local electricity network. The idea is also to have some experiences for future smart meters and regulations that might come with them.
Does any body has experiences in that area, some good tips...

Policy and solutions / Re: Energy Efficiency: The “First Fuel”
« on: September 20, 2017, 01:24:46 PM »
Those that have are reporting large electricity savings and those sorts of operations tend to have people who look for ways to cut expenses.

You're absolutely right. If you don't ask for the change, it comes when the old solution is not available anymore. I'm managing a new building, and I was very surprised that most light bulbs are halogen. Keys of the building have been handed out in July this year. I'll suggest to have them all replaced by LED, it will be an energy saving and a time saving action since LED last much longer. Some suppliers try to keep the incomes coming from changing lightbulbs.

Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: September 20, 2017, 01:18:19 PM »
Regarding the gas station of the future, there is something missing. It could be local electricity storage (just like now gas station store gasoline), or it could be a restaurant, sport infrastructure... I don't believe that the electricity network could support so many fast charging in parallel.

Policy and solutions / Re: Oil and Gas Issues
« on: September 15, 2017, 09:04:01 AM »

Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: September 14, 2017, 07:31:31 AM »
Well, in Europe, we don't drive so many miles than in the US. I have like 40 miles to drive every day to and from work. Major shopping areas are like 5 to 10 miles away from home. Furthermore if you have the ban of ICEV downtown, this would make these cars quite useless.

Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: September 13, 2017, 09:41:41 PM »
Don't know how things work in the US, but in Europe, the first registration of the vehicle is a different process than a change of owner. Change of owner will still be possible, but not first registration anymore. Let's hope they won't change their mind.

My experience is that after 10 years, I have more costs than the value of the car.

Consequences / Re: Hurricane season 2017
« on: September 13, 2017, 06:22:45 PM »
Sorry for my supid comment, but I believe that when a heatwave will kill 150'000 people in the American Southwest, it will be too late for everybody.

With "an eye for an eye, a tooth for a tooth" concept, you only get blind and toothless people.

Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: September 13, 2017, 06:17:15 PM »
I heard an intersting comment 2 days ago on the Belgian national radio in the context of the NOx pollution.

In Belgium, new ICEV can only be registered until 2030, but the government believes that at least 5 years before, sales of ICEV will stop almost completely because vehicles have a life span of around 10 years, and once the registration of the ICEV will be forbidden (probably even before), ICEV infrastructure (gasoline stations...) will become less available. Furthermore, the government plans to limit the downtown access to polluting vehicles, increasing slowly the requirements (this is already the case in some French and German cities.

Don't know if this ban is also for trucks.

I also heard this week that France plans to have the same level of taxes on gasoline and diesel. Last year in France, every second car sold was a gasoline car (it used to be 80 % diesel). It would be a problem for car manufacturers because they don't have the needed production capacities for gasoline motors, and it will probably become a problem for the oil refineries that are used to produce 80% diesel and that will have to invest now that EV are on the roadmap. I guess gasoline price will go up world wide which might become an extra incentive for EV

Walking the walk / Re: Gardening
« on: September 02, 2017, 12:30:57 PM »
A funny thing about slugs is that they seem to hide under the bigger salads and go out at night to eat the new ones that just came out of the ground. As long as you have new salads, the "older" ones can grow without being eaten.

Policy and solutions / Re: Renewable Energy
« on: September 01, 2017, 07:54:26 AM »
If you don't need all the power of the batteries to drive around, than it would be better to onload the batteries and leave them at home for network balancing. Batteries are too heavy to be driven around just for fun, much heavier than the inverter.

I don't think anyone is suggesting that batteries be removed from cars and left hooked to the grid.  The idea is to keep as many EVs as possible plugged in as much as possible so that electricity can be pulled from the vehicle when needed.

Batteries are far too heavy to be moving in and out of EVs without some heavy duty equipment.

Well, there was a working project in Israel where you just switched the batteries at loading points instead of waiting all the loading time. Same thing could be possible at home. You could have two different batteries, one small and an bigger one, and when leaving in the moring, you could just choose the one you need.

Policy and solutions / Re: Renewable Energy
« on: August 31, 2017, 10:38:30 AM »

Probably cheaper to put an inverter in every EV rather than every outlet where an EV might plug in.

Inverters are getting a lot smaller and lighter.

Maybe, but I am thinking if a family has 2 electric cars, one inverter and two sockets would be better than paying twice for the inverter. Even one electric car followed by owning another might not outlast such an inverter. Can't imagine many people having set up for charging EV in more than one location in their house. If out at restaurant/supermarket/wherever and need a charge to get home then I wouldn't want it discharging instead. So what would be the point in having that possibility other than at normal charging point for the car?

Any weight the car doesn't have to carry seems like better not to carry it to me.

Can't argue with your logic.  But the odds of power flowing back to the grid from EVs looks unlikely to me.  EVs are not likely to be used as long term storage, they have too little spare capacity.  Utilities are already installing batteries to do grid smoothing, the possible EV job.  Batteries are already becoming cheaper than using gas peakers so by the time there might be enough EVs available it could be that the smoothing role will have been filled.

There is another issue regarding using EV batteries to balance the network. EV batteries should always be loaded in order to have the vehicle available, so you can load them faster or slower to balance the network, but you shouldn't take electricity away.

If you don't need all the power of the batteries to drive around, than it would be better to onload the batteries and leave them at home for network balancing. Batteries are too heavy to be driven around just for fun, much heavier than the inverter.

When using multifunction tools, you always loose energy. So we shouldn’t try to use cars as multifunction energy provider.

Policy and solutions / Re: Renewable Energy
« on: August 27, 2017, 10:00:55 AM »
So in my view, we must push for max electrification of energy systems, embrace smart flexible grid solutions, empower distribution grids to accept high intermittent RE penetration, and get very serious about energy efficiency.

I totally agree, but we have another challenge : efficiency and smart grid don't intersect everywhere. I see always more low efficiency systems developped in order to use PV power in excess.  The idea is for example that it would be better to heat electrically your sanitary water with PV power than to use the heat pump with grid power.

I don't like this way of working, and I believe that these are short time solutions. When EV and batteries will be more comon, all these systems will become obsolete. You could always say that the electrical water heater is a simulation of the loading of the EV that you will buy sometimes during the next 5 years, but these systems are too expensive to be just simulators. I would prefer to see efficient storage solutions, or production of usefull products like hydrogen.

In the cars, cars and more trend, we have a nice graph showing that EV are 3 times better than fuel cell vehicules,438.msg126012.html#msg126012
but this is the same difference than between a heat pump and an electrical heater, just that hydrogen keeps its energy power over time, and overheated sanitary water just cools off because you can't have a 100% insulation.

Policy and solutions / Re: Renewable Energy
« on: August 27, 2017, 07:40:02 AM »
It takes 2 to 5 years from the lab to the shop, if it ever takes the way. In the most cases I know, final use of the technology is far away from the lab prototype, maybe this will be the future roofs of cars or ships. This is why freedom of research is important, when developping a new technology, it is impossible to know what industry will do with it.

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