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Messages - etienne

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Policy and solutions / Re: Oil and Gas Issues
« on: February 16, 2018, 06:11:51 PM »

And in turn that means the oil demand falls, and expensive oil is abandoned to stay in its geological storage.

Here we agree, but from what I understood, cheap oil production peaked around 2005, which would explain the price hike up to 145 $ per baril. So if expensive oil stays in its geological storage, maybe supply won't be enough and prices will stay like it is now, between 50$ and 70$. I don't believe in oil abundance anymore excepted for short period of time.

Policy and solutions / Re: Oil and Gas Issues
« on: February 15, 2018, 08:17:29 PM »
I saw Tony Seba's presentation in September (there was a link on and when I sent the link to friends, my comment was "Very interesting presentation on energy transition. Datas are probably right, but I feel that the conclusions he makes are too easy to be true. I'm sure we'll have many surprises in our lives".

I agree that demand will probably go down, but I don't agree that prices will be constraints by demand.  Whale oil price didn't go down when  it was replaced, or for a very short time. Production stoped.

I agree that we will have self driving cars, that it will reduce car ownership, but not that it will stop car ownership like we know it now. BMW has a concept self-driving car with the possibility to drive it if the driver wants.

I agree that we will have batteries and PV everywhere, but load balancing is a major issue that might require centralized systems (don't remember if this was also in Seba's presentation).

The point about escaping Jevons' paradox by Sebastian Jones is a very good point, I can't wait to see how things will change.

Policy and solutions / Re: Oil and Gas Issues
« on: February 15, 2018, 08:10:09 AM »
Hi Numerobis,
Yes, my thinking was too much sumarized to be understood.

On once side, Jevons Paradox (increasing efficiency increases consumption) makes me believe that we might find new users for fossil fuels if prices go down - a price reduction is for me similar to an efficiency increase but from a cost point of view.

On the other side, if prices go down, expensive production sites will slow down or stop, like in Alberta.

So between these two constraints, I don't see much space for petrol abundance.

Regular price hikes  boosts efficiency or switch toward renewable, but this doesn't help  on the way to abundance since reduced demand also reduces production.

There is a similar behavior with appartments and houses. When too many are available, construction stops until everything is sold, so abundance is only available in areas that people are leaving. This doesn't work as well with offices because there is much more technology in office's building than in appartments and houses.

Policy and solutions / Re: Oil and Gas Issues
« on: February 13, 2018, 11:33:47 PM »
Peak Oil Demand Is A Slow-Motion Train Wreck

Excerpts from the article:

“The significance of peak oil is that it signals a shift from an age of perceived scarcity to an age of abundance,” they wrote.

Looks like some people don't know Jevons Paradox. Somehow I can't believe a word of that story. I'm sure that peak oil will be a peak of the offer. Prices might not reach soon the 140+$ level, but that demand would peak without having higher prices would surprise me a lot.
The issue I see for oil producers and consumers is unstable prices which makes it impossible to have a good business plan with that energy.
I agree with the peak income for oil majors concept, but not with a peak demand that would make oil abundant (lower prices closes production infrastruture which reduces abundance).
I also agree that regular price hike are very destructive for oil demand, but not because people switch to another energy source, more because they boost efficiency for people who can aford it, and reduce the oil consumption of the ones who can't because they get poorer.

Well, I voted for 2025 to 2030 because of a single word in the question : "MAJOR" brand.

Of course there will be ICE engine for a long time, but I'm pretty sure that all major brands will only produce battery or fuel cell cars before 2030. ICE will become some luxury product like horse carriage is today. Which major car brand sells horse carriage ? Well, in France, the Peugeot brand (PSA group) still sells pepper mills and bicylces, so you never know.

Policy and solutions / Re: Renewable Energy
« on: February 05, 2018, 11:00:40 PM »
I still don't get the economics of this relative to utility-scale. It seems like a great idea for social justice though, so I'm all for it.

There's no way the installation process is going to be cheaper on a house than on a plot of land out in the country. When you're setting up megawatts in a field, it's pretty simple. Setting up kilowatts on each of thousands of homes is a lot more fiddly work, each project similar but slightly different.

For the economical side, I don't know, but from a smart grid and technical point of view it is very interesting. You don't need cooling for the inverters, you don't have problems in case of failure because only few kW and concerned, you have people who are worried about making some money so they check regularely if it works properly, you don't use agricultural land for energy production... I don't think that it helps anything regarding power transportation cables because maximum loads often don't match with maximum consumption time. I just checked a refrigerated building today where a 120 kWc installation would have only reduce of 30 kW the peak consumption of the building last year. The issue is that we had a hot cloudy evening in July last year, so we had a high consumption around 6-7 pm with a low production.


Running calculation is an extension of the running average methodology. In order to follow a building, I have been using it to check if consumptions where ok. I also used this method in other context and found it very efficient.
It is easy, often well known, but not so much used. I wanted to write this document to show how much information can be found in a dataset if data are transformed using that simple method.
It is very helpful with data that don't follow physical rules, like the water consumption in a building (the aim being for example to find leaks).

Some of the ideas that are presented in the document could be integrated in a centralized technical management software (I have already seen example were some ideas had already been integrated).

I though that this might interess people active on this forum, so I wanted to share this document.

A new version (2018 01 28) is available here :



Policy and solutions / Re: Renewable Energy
« on: January 16, 2018, 09:23:05 PM »
I just noticed this:
The city of Tallahassee is proposing to shut down its hydroelectric generating station on the Ochlockonee River in favor of cheaper solar power.
The plant power costs $85 per megawatt hour to produce compared to $50 per megawatt hour for power from a solar project being built to serve city customers ...
Politico, 2017-07-20
I guess that there is not much height difference, or not enough volume and that this explain the high cost of electricity. We have such a situation in Luxembourg, a lake was created for drinking water mainly, but an electrical generator has been installed. The generator is still working, but the power is 2x 5500 kW for 55 millions m3 water.

Policy and solutions / Re: Grid data and energy balance.
« on: January 16, 2018, 05:56:18 AM »
Getting back to grid balancing in a renewable world for a moment, please feel free to take a look at the Great British OpenLV project:

The OpenLV Project will trial and demonstrate an open, flexible platform that could ultimately be deployed to every LV substation in Great Britain. Through three key Methods, the Project will demonstrate the platform’s ability to provide benefits to the network, customers, commercial entities and research organisations.

Except of course that

Western Power Distribution is a subsidiary of the American utility corporation PPL.

The project really looks great from the grid side, but I wonder what are the real advantages for the people participating once the project is over. The sharing of the benefits of a balanced grid is a very complicated issue.

Maybe I am unfair with the project because somehow I believe that there is more money to do with an unbalanced network, so a balanced one should bring general costs down which should also bring down the final cost for customers.

Regarding the origin of the company, I never understood why countries agree to sell strategical infrastructure. Even for public tranportation, why is it a french company that manages public busses in Zeeland, Netherland (haven't been there for a long time, don't know how it is now) ? But that is out of topic.

Policy and solutions / Re: Renewable Energy
« on: January 16, 2018, 05:40:03 AM »
It's surprising that there is more wind in the summer than in the winter. I would have expected the opposite. Is this a standard ? My feeling in Europe is that we have more wind in summer.
The bad news would be that sun and wind come together.

Walking the walk / Re: Fundraising selling organic cotton clothes ?
« on: January 10, 2018, 11:07:42 PM »
For example from my V2G graph,

I made a V2G T-shirt.

I guess this was about 2 or 3 hours work.


Policy and solutions / Re: Renewable Energy
« on: January 10, 2018, 09:58:09 AM »
Another way to turn it would be :
- predictable
- reliable
- gradable
- cheap

what do you want more ? well to chose when it is available, but here the answer is storage and load management.


Policy and solutions / Re: Renewable Energy
« on: January 10, 2018, 07:09:45 AM »
What do you think of these statements showing how great wind, solar and hydro are as energy sources for the future ?

1) they are predictable. Wind, sun and water levels are quite easy to predict.
2) they never break down completely. If you loose 10% of a wind  or solar farm, you have a big problem. Furthermore you have many little units, so massive break down is almost impossible. I wouldn't say the same for coal or nuclear.
3) they are easy to curtail, this can be done fast and precisely. It was directly in the "DNA" of the technology since load management on the electrical lines with renewable production was directly an issue.
4) solar and wind are now cheaper, so some curtailment is not an issue from the financial side.

I find them great.


Walking the walk / Re: Fundraising selling organic cotton clothes ?
« on: January 08, 2018, 06:35:40 PM »
The store is very easy to create.

Here is what I achieved in about half an hour.

The design of the T-shirt takes much more time, but the aim was to do something cool with the kids.


Walking the walk / Re: Managing PV + battery system
« on: January 07, 2018, 11:52:54 PM »
From my experience, I believe that there will be in the future 3 main configurations for batteries at home.
1) V2G which would allow peak shaving. This is quite interesting because most appliances use electricity when we are at home. The main exception is the dishwasher because it dryies the dishes about 2:30 hours after it starts. Utility companies will probably charge more for high power usage once smart meters are generalized, and the V2G system will allow you not to pay the extra cost. I don’t believe that batteries’ cost would drop so much that having batteries just for that might be financially interesting.
2) batteries that are managed by the utility company. If you manage your batteries yourself, you might load them when there is a peak on the network, and unload them when energy is available. A centralized management is much smarter. Furthermore it is not possible for the utility company to share the benefits honestly between the owner of batteries for loading when price are negative, and unloading when prices are high. Having the batteries near the end user has the main advantage that is helps when there is a general peak, but also when there is a peak just on the 10 or 20 kV line going to your living area. So I believe that we will buy batteries, install them in our houses, and get some money from the utility company for that. I heard on this forum about such a project in the Orkney Islands and in Germany. Loading batteries with excess PV production is a nice concept, but it is still expensive and from a network point of view, it makes more sense (so should bring more money to the owner) to have the batteries managed according to the needs of the network.
3) In areas where the network is not so stable, batteries are used as UPS. This is already common for the IT equipment, hospitals, military... but I heart of a dentist who bought UPS to cover all his needs during at least 30 minutes.

Well, things change quite fast and I wonder what I would say next year.

Walking the walk / Re: Managing PV + battery system
« on: January 07, 2018, 03:47:16 PM »
I made a little mistake in my calculations. During Christmas time, 1,6 kWh battery would have been enough for peak shaving at 1,5 kW, and during the first example, 0,6 kWh would have been enough.

First values where how much energy above 1,5 kW is used during 4 hours, but I didn't deduct the loading possibilities that where available during that time.

New values are, knowing that my batteries don't loose any energy in loading and unloading, that the system is very fast to load the batteries each time that power usage goes under 1,5 kW, this is the battery power I need.

I tried with only 80% efficiency, but I got the same values because times between peaks is long enough to reload the batteries even with 80% efficiency.

Policy and solutions / Re: Renewable Energy
« on: January 07, 2018, 10:42:55 AM »
The question is whether this is a smart industrial strategy or if it is subsidies.

I don't know but I wonder. Forced closing factories is not ok for me.

Policy and solutions / Re: Renewable Energy
« on: January 07, 2018, 08:30:16 AM »
Do we have any detail how China subsidises solar panels ? I don't believe that they can subsidises all the technologies where they are cheaper than the rest of the world (LED...). I feel that China has somehow good engineers that have low salaries, and good workers with very low salaries.
If they do tax cut, than I would say that it is too bad that the other countries don't do it as well. Subsidies is something that have so many faces that everybody can do it, claiming that they don't.

Policy and solutions / Re: Oil and Gas Issues
« on: January 06, 2018, 04:48:37 PM »
Up til Dec. 31, 2017, U.S. oil companies were taxed 9 cents per barrel to fund spill cleanups.
On Jan. 1, 2018, GOP let the tax drop to 0.

Why would the administration curtail response funds and alter safety rules at a time when it is pushing to expand oil and gas exploration on land and offshore?  “It’s indicative of a mind-set that safety’s a secondary concern.”

Well, this is a common way to act and it is why there are laws to protect people and nature. There was in south Belgium a guy going aroung in a van, selling tools with lifetime guarantee. Just that each year, he created a new company and closed the old one, so people who had a problem with the tools had to complain at the producer or the importer, not at his mobile shop.

Policy and solutions / Re: Poll: Relative importance of countermeasures
« on: January 06, 2018, 03:46:23 PM »
I am not convinced of population graphs going up to 2100. Our world changes too much to have any valuable information on more than 5 to 10 years. For example I believe that life expentancy will go down in developped countries because we reach a point were benefits of improved medecine are limited for example by increased pollution, stress... In the USA, life expentancy is already going down.

To reduce growth rate, girls' education and contraception are the most effective ways to work, and they have to be present together. In "developped" countries, harder times usually mean less kids. When "developped" countries want to increase their birth rate, they pass laws to help families. I also believe that having mens taking more care of kids also helps reduce birth rate, but that’s something that is usually achieved through girls’ education.

Going against climate change means acting now, we can’t hope that things will change by themselves even if we feel that we are going the right way. I heard of an interesting concept that a good action has 3 axes that must be in balance : acting, trying to change the context, and making it public. To go back to climate change, it means that you can for example help people reduce their CO2 emission, make pressure on politicians  to improve the laws (CO2 tax...) and inform the press of what you’re doing. The press is not always the best way, but for example buying an EV or organic clothes, making city-trips by train instead of airplane... are also a way to inform people around you that you are acting against climate change.

Policy and solutions / Re: Poll: Relative importance of countermeasures
« on: January 05, 2018, 02:48:11 PM »
I have to agree with Oren and Tor, I feel that we will have to adapt because I feel that we just won't be able to cut our emission as fast as needed. There is that Jevons paradox that kills us. Some years ago, I was hoping that peak oil would help, but oil prodution is just going further up with more CO2 intensive extraction methods... coal consumption doesn't really go down...
Adapting is quite an issue, hope we won't do it the way Syria adapted itself to the drought. That was not so efficient, but the drought was probably not the only problem.
Constrained adaptation usually doesn't bring great results, but I don't see any real action to change things.
I remember in the '90 activists saying that gasoline should cost 5 EUR equivalent per liter. We are still just above 1 EUR per liter in Luxembourg. Why ??? I don't believe that taxes will save us, but energy is so cheap that energy investments (excepted LED lightnings and improved management/regulation) need too much time to bring a ROI .

Walking the walk / Fundraising selling organic cotton clothes ?
« on: January 03, 2018, 08:48:22 AM »
I received an advertisement from Rapanui Clothing for their Teemill system which allows people to start their own T-Shirt shop.

Their clothes are full organic and of good quality. Many organisations use the system for fundraising.

So if somebody has artistic competences, this could be an option for fundraising and creating cool clothes.

Here are some examples :

Don't know if this would be an option, but I'm not the artist here.

It's almost free, which means that there is no direct costs, excepted that you need to order the T-shirts you design if you want to publish pictures of them.

Best whishes for 2018 to everybody.


Walking the walk / Re: Managing PV + battery system
« on: January 01, 2018, 08:48:58 PM »

Here is my V2G graph for Christmas time (December 24th, 25th, 26th).

This time, I need a 2 kWh battery for a peak shaving at 1500W. edit : 1,6 kWh, see comment below

Datas are always 5 minutes average.

Best regards,


Policy and solutions / Re: Batteries: Today's Energy Solution
« on: December 12, 2017, 10:23:48 PM »
In the project of an appartment house with batteries on which I work, I need around 100W to keep the batteries and electronic around it safe and available during the winter. Daily values are between 2 and 3 kWh per day for 15 kWh batteries. This means that a full load and unload per day can't have more than 80% efficiency. So this also means that you need more than 20% price difference between high and low electricity cost just to cover general costs.Transport and taxes being about 40% of the total electricity cost in Luxembourg, this means about 30% difference on the "energy part" of the costs.
So when we talk about "smart appliance", I would say that the first smart thing to do is that appliances (washmachine, dishwasher...) should use warm sanitary water each time that it is possible because water can be easely heated when power is available using a heat pump (or is heated with fossil fuels which don't bring much load on the electrical network). I know this is already the case in the US, but not on this side of the Atlantic.
The main problem we have now with "smart appliance" is that they are smart grid ready, but the communication module with the grid which is not smart yet is missing.
When you want to install some king of system to optimize your PV consumption right now, you have to install an extra counter at the entrance of your network and can work with sockets that open and cut electricity supply (the Smappee is one of many examples) or you have to develop some kind of interface connected to your applicances, controlled by a Rasberry or similar (Loxone, KNX...) that is also connected to an extra counter to control how much power you use.
The problem (and idea of smart grid) is that power usage should be optimized on a part of the distribution network, not just on individual buildings. Even if you have too much PV power, you shouldn't load your batteries if there isn't enough power in your neighborhoods.

Walking the walk / Re: Gardening
« on: December 08, 2017, 02:23:49 PM »
If somebody is looking for some winter vegetables, I really recommend Brussels sprouts.
This year, I really have a great harvest. Don't know if it is because it growed just near the potatoes or if it is because it was in the new extension of the vegetable garden.
Some look better than other, but the inside is always good.
Home grown are much better than the deep freezed version. It's worth trying.
To be honest, Brussels sprout and potatoes are my only real success this year, but I'm still learning and next year should be better. Other things like salads, carrots, kohlrabi and leeks were ok, but in little quantities.
Chard went well, but nobody want's to eat them anymore here. Maybe in the winter, they seem to support the cold weather.

Policy and solutions / Re: Renewable Energy
« on: December 02, 2017, 08:43:02 AM »
Just for information, something that works very well in Luxembourg with PV systems is shared proprierty (or cooperative company, don't know what is the best English word for that).
On this link, you'll see all the ones we manage at work.
When data is missing, it is most of the time transmission or data management problems.  Inverter are much more stable than the data transmission system. Main fix is plug out, plug in.
By "manage", I mean that we have a contract were we follow up the system to make sure that it works, and take care of all the legal/accounting aspects.

Policy and solutions / Re: Batteries: Today's Energy Solution
« on: December 02, 2017, 08:36:25 AM »
Nice website Jim. It's not linked to being able to purchase anything though, so you still need to run around and find quotes (which installers try hard not to give you).

New technologies are always complicated to get. When I installed a ventilation system in 1998 in my new house, the installer only agreed to work with hourly rates. I had to take the risk.

Walking the walk / Re: Pat yourself on the back
« on: December 01, 2017, 08:23:59 PM »
I always thought that people weren't stupid in the old times, and weren't very rich either, so usually old houses are very energy efficient if you use them like in those times. So before changing something, it's always good to think at why people built houses that way.

Of course, houses could have been even more efficient, but insulation material (stroh, wood...) just wasn't available in the quantities we have now (and we only have these quantities available because most people insulate with styrofoam, rockwool or similar materials).


Walking the walk / Re: Pat yourself on the back
« on: December 01, 2017, 01:48:22 PM »

Here is the document to help you :

It is really interesting. I used some of the ideas that are in the document, but most of them don't pass the "wife acceptance test" at home.

Good luck,


Walking the walk / Re: Managing PV + battery system
« on: November 27, 2017, 09:50:41 PM »

Here is my 4 hours scenario using the data of the day with the highest requirements. Battery need is 1,1 kWh. edit : 600 Wh, see comment below

I only use the dryer 4 to 5 times a year, so I think it's no use to buy a new one.

Best regards,


Walking the walk / Re: Managing PV + battery system
« on: November 27, 2017, 09:04:33 PM »

Here are the last values.

The median value of my electrical consumption is 290 W, much under the average that was 390 W.
This is not a surprise because peaks are very thin.

The 4 hours scenario works, it means that I have always enough time with low power to reload the battery within the 4 hours following a peak, even if I want to stay under 1500 W of maximum power. That's good news for the V2G concept.

Best regards,


Walking the walk / Re: Managing PV + battery system
« on: November 26, 2017, 10:12:58 PM »
Well, here are some first results.

Average power usage is around 400 W

I have a scenario where I load batteries at night (24h time frame):

I need 1.9 kWh to shave peaks above 1.5 kW, and 0.9 kWh to shave above 2 kW.
If I remove the day where my wife used the dryer (clothes), the values are 1.2 kWh and 0.6 kWh.

There is also a 4 hours scenario (close to a V2G configuration)

I need 1.1 kWh to stay under 1.5 kW and 0.6 kWh to stay under 2kW.
Here again, if I remove the dryer's day, it is 0.35 kWh and 0.7 kWh.

Here, I still need to check if power usage goes down enough to allow battery charging before the next peak.

Of course, the needed power is quite important, like 7 kW (Smappee also shows real time values, but doesn't keep them).

Walking the walk / Re: Managing PV + battery system
« on: November 26, 2017, 12:47:02 PM »

Could you integrate the peaks above 1.5kkW and estimate averages/medians/peak energy requirements in KwH as well ? I ask because this might be an application for a capacitor bank coupled to batteries.


Yes, but not today. Maybe middle of next week.


Walking the walk / Re: Managing PV + battery system
« on: November 25, 2017, 03:54:10 PM »
When I look at my consumption graph (5 minutes average), shaving peaks above 1,5 kW would require almost no battery power, but it would require a high power inverter and a fast discharging batteries.

Walking the walk / Re: Managing PV + battery system
« on: November 23, 2017, 10:45:40 PM »
" a battery that fills itself when power is available, and makes sure that I never take more than 4 kW from the network."

Called "peak shaving"  and being used in industrial and commercial settings. A lot of is is thermal store (supercool freezers or make ice when power is cheap) but some is battery based. This is important for thos (usually) large electric customers whose rates are partially basd on peak load.


Peak shaving as described is much easier to manage in the context of industrial and commercial settings because they usually have an infrastructure managing system and have a wider choice of load to start and stop.
At home, my peak is in the evening (lights on) when the chicken is in the oven and the potatoes + the vegetables in two different pans. Even if I would stop my refrigerator and would make sure that no laundry appliance works at the same time, this wouldn't solve my problem.
To be very honnest, this is not a problem right now, but next year in Luxembourg we will have a proof of concept on a residential building with self consumption of PV electricity where the network costs will be based on the highest peak of the year. In the 2017 context, self consumed eletricity has the same network cost than bought electricity because the network was available to transport it. The building has batteries with an SMA home manager, so it would be nice to use it for peak shaving. We asked for it and got more specific questions about our needs, so maybe they will offer the functionnality sometimes in the future.

Walking the walk / Re: Managing PV + battery system
« on: November 22, 2017, 10:52:52 PM »
When I check the datas of my Smappee, I see that I use between 6 and 12 kWh per day.  I guess that the highest power usage was around 10kW, but we didn't pay attention at limiting total power.
This means that with a 5 kWh battery, I really could cut all the peaks of my consumption. I guess this might be a solution for the future :  a battery that fills itself when power is available, and makes sure that I never take more than 4 kW from the network.

Walking the walk / Re: Managing PV + battery system
« on: November 22, 2017, 07:00:41 PM »
Hi Jim,

It's an interesting article. The main problem I see right now is that optimisation is tried on a building level, but a wider area should be considered, at least all the users of the 20kV line that supplies them.
Electricity need at night is lower than during the day, which means that I wouldn't use the battery to load the car at night, but to support house consumption in the morning before the sun goes up. On the building I manage, the absolute peaks are in the morning when coffee machines and water heaters are working. Water heater are related to showers and coffee machines to breakfast. There is also a peak in the evening, but wider and lower (probably higher total consumption, but during more time). Maybe we should have had a bigger warm water storage.
The second point is that the general load curve is higher during the day, so on a global level, PV related batteries could only be loaded when global supply is insured without CO2.
I wonder how smart grid will be able to manage a fair sharing of the incomes related to discharging batteries in the network when electricity demand is high. Same question about who will be able to load his battery with cheap electricity when supply is higher than demand.

Regarding MyEnergi Eddi/Zappi, I have to read more about it. I can't give you an answer yet.


Electricity seems to be cheap in Ontario. In Luxembourg, I pay 0.15 EUR/kWh.

Almost all of the province of Ontario, Canada has smart meters because time of use charges are the norm. My local distribution company analyses the current usage patterns to determine what classes of devices are consuming the electricity. This is possible even though none of the devices are "smart".

Here's mine for last month as an example:

Do you feel that your appliances have been recognised correctly ? The Smappee tries it also, but this doesn’t work so well yet. Since the user manual says that it needs at least one month to have it right, I won’t discuss this too much yet.


What is the state of play regarding "smart meter" rollout in Austria? Do you have one for example?

Same question for Etienne, in France I assume.

Well, I live in Luxembourg. Here we have a crazy situation because smart meters are being installed, but the communication infrastructure is not ready. So somebody came last week to my house to read the value on the smart meter to inform the utility company of my consumption.

How are the sockets opened/closed? Via radio or the power lines themselves?

For the communication with the sockets, I believe that it is radio controlled. 433.92 Mhz. Don't know how far that frequency can go. This is an issue for us because we try to limit electro-magnetic waves in the house.

Policy and solutions / Re: Energy Efficiency: The “First Fuel”
« on: November 20, 2017, 10:28:07 PM »
I also like this part of the description :

RealFly is committed to the environment

Our team applies simple daily actions to preserve it.

★ All internal correspondence is by email.
★ Our premises are equipped with a LED timer system for off-peak hours.
★ All waste is carefully sorted and recycled.
★ Management and optimisation of our printers
(printing in draft mode and printers in standby mode).
★ Toner cartridges for our printers are sent to specialised
recycling companies.

Well, this kind of system is only possible because of the efficiency gains on electrical motors, heat pumps (air has to be cooled) ... and is some kind of electrical proof of concept of Jevons paradox.

Policy and solutions / Re: Energy Efficiency: The “First Fuel”
« on: November 20, 2017, 09:45:15 PM »
Well talking about efficiency... if you had a doubt that energy is too cheap, just check this :

I'm also working on a project "EnergiewabenGR" that aims to define a local energy management model for renewable energy. The idea is to find ways to adapt consumption to production.

Since smart meters are not active yet, we are mainly working on a model, but what I wanted to talk about is a Smappee product ( that we use to mesure the electricity load curve of buildings.

Data are provided by 5 minutes.

The systems also can mesure PV production if you have any, and can open electricity sockets when solar production is available.

It should be able to detect when different systems are on or off (refrigerator, washmachine...), but it takes some times to have it work properly and it's too early for me to give you any feed back on this.

There are other controls, but always with sockets like turning them on/off at a specific time, when the sun does up/down, when some system is on.

Bellow you'll find my consumption of yesterday. The highest peak is related to cooking, the second one to the  vacuum cleaner.

It also defines a base load.

I'm not sure that this will help me to save much energy, but it is interesting. I found the product very interesting and the price is ok (furthermore I didn't have have to pay for it).

Policy and solutions / Re: Renewable Energy
« on: November 11, 2017, 11:24:15 AM »
Grid tie inverters automatically 'island' themselves when grid feed is lost.  And lock back on to grid frequency when the grid comes back up.

Grid tie inverters with battery backup have been available for a long time.

I fully agree, but this is not the standard configuration in Luxembourg. This is only done when a no break electricity supply is needed because there are some extra cost.
  • First, you need to disconnect yourself of the network, otherwise your electricity will just leave your home to supply a network that is like a bottomless hole. Voltage would go down and the inverter would stop.
  • Secondly you can only reconnect to the network when it is syncronised with your inverter. For diesel generators, the cheap solution was to first stop the generator than to reconnect to the network.
In Luxembourg, inverter are simply connected to the network, and only work when the network is present. I guess that we have a few microcuts per year, but only on limited parts of the network. Cuts over 10 minutes probably don't happen more than once every 5 to 10 years and usually not on all the network. I remember myself of only one general cut above 1 hour in 22 years of professional life.

Policy and solutions / Re: Renewable Energy
« on: November 10, 2017, 02:06:22 PM »
Yes, but in the meantime, the folks who have installed solar now have a way to make use of their existing panels for at least partial power, at a time when they need it the most.  It's ridiculous that if the grid goes down they can't make use of the technology they have invested in.

The problem is syncronisation between PV and network when the network comes back. The cheap way to do it is to turn off everything again when the netwok comes back, and restart everything using the network as reference. Some additional technology is needed and damages are possible if it doesn't work properly. With a network that is in most industrial countries very stable, it makes no sense to invest in this additional package.

Policy and solutions / Re: Oil and Gas Issues
« on: November 01, 2017, 05:47:06 PM »
I also belive that things will go very fast. When battery costs will have dropped enough, ICE will be just nonsense.
Excepted for the batteries, electrical technology is cheaper to build and to maintain.

Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: October 29, 2017, 05:48:13 PM »
Well,  I drive much more and range is an issue on one of the two cars. The small car never left the country (Luxembourg - 81 km from north to south), but with the other one, we do at least once a month much longer distances. So if I could drive with batteries on regular basis, and have a fuel cell for longer distances, I would see it as much better than an hybrid vehicle. I have no idea how much space the fuel cell needs. Maybe a low power fuel cell that would reload the batteries would be a good deal.

Policy and solutions / Re: Oil and Gas Issues
« on: October 28, 2017, 10:08:49 AM »
What I meant was that for example :
- In 1991, prices go up, and production is only up when prices are down again
- In 1998, prices start to go really up and production do go really down
- In 2014, production stays up even if prices drop.

So there is no direct link between production data and price data.

Policy and solutions / Re: Cars, cars and more cars. And trucks, and....
« on: October 27, 2017, 11:53:40 PM »
Now Toyota admits that Tesla CEO Elon Musk, who called hydrogen fuel cell  “incredibly dumb”, “is right,”

Something to watch out for. 

There's bit of information about the potential charging time for the Tesla 3.  If it's true it looks like the 3 might be capable of 80% charging in about 15 minutes.  That would take, of course, an upgrade to the Superchargers but that's been in the works.

If it does turn out to be possible to charge that quickly then there are no more arguments that can be made to support H2 FCEVs.

Well, if I would need a range extender for an EV, I think a fuel cell would be a good option. It's too early to know who will be the winner.

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