Friday, June 23, 2017

Few novel ideas about the doctors strike.

First of all, I will be honest and state my standing. I will personally choose and take the side of a professional any day anywhere over a politician! Remaining (without migrating to rich countries) top professionals like doctors, engineers, scientists, lecturers etc are a huge asset to the country. You don't even have to be a top skilled professional to be an asset to rest of the society. Teachers, policeman, military, nurses they too are indispensable professionals we all need.

We all know what politicians (of all color) do in this country and has done to this country. None of us will miss them and none of them is indispensable. So again, if the fight is between working professionals and ripping off politicians, I will take the side of people who put up actual work and contribute, on any day!

As usual, on the SAITM issue as well, politicians of all color were not honest and transparent from the start. Private paid education is a need in the country, that must be there and we will have to get over that fact someday somehow and sooner the better. However, the way politicians were pushing their agenda was dishonest and corrupt. This post is not about SAITM though. So we will turn back to the strike issue.

As far as hearts and minds go, doctors are loosing the battle I think. This was summarised nicely by one of my friends who is a doctor himself, infact a professor as well who is teaching medical students. He said only the poor people get affected by the doctors strike. Rich would anyway go to private hospitals and dispensaries.

It is true, poor people who has to wait on long queues and could even risk their lives and lives of their loved ones need our attention. Lets quantify a bit. This "poor people" mentioned here is actually more than 80% of the population! These people have power only in an election, in all other times these are not the influential people with their own say or people who can change the decision making processes and make their voices heard. Hurting these people and loose their love, comradeship and blessings is not a positive thing at all for the doctors cause, to say the least.

So how to do a better strike and make an effective statement ? It was my wife who suggested this to me first... and it really sound neat! "Work in the general public hospital, give your best to the people and strike in all private hospitals and dispensaries. Do not engage in private practices during the strike"

Idea sounds fascinating! it has following advantages.

1) No one will be able to accuse doctors of being selfish and immoral. Right now, even when there is a strike in the public hospitals doctors do engage in private practices and do work in private hospitals, this does not look good in the eyes of general public. This could also be used by the state media against doctors.

2) Rich and influential people will get affected by the strike. It is more likely to direct towards a solution than hurting people who are powerless and have no say.

3) Support of the general public would be on the side of doctors!

4) Would be a good PR move and can get media and others talking about this in positive light. It is also good for a change!

5) All politicians, their relatives and supporters go to private hospitals!

Open for discussion for all. What do you think ?

Monday, January 23, 2017

Got a New Car - Why I think this (or similar) could change things a lot

Ok, here we go again... another experimental car!

If you are not familiar with this serial craziness of mine, there is enough evidence and past patterns in here : Green Cars, A personal history from Prius to Leaf

I like my LEAF. It's silent, clean, advanced, powerful and yet very comfortable. However I'm much more thrilled and proud to own this little car from China.

why ???

Because, unlike the LEAF (despite it's all the goodness, only very few in Sri Lanka can afford one, hence limiting it's potential of mass adoption and changing the world for the better at least in Sri Lankan roads) this car has a huge potential to change the landscape and get our people to mass migrate to electric vehicles!

Let's elaborate.. (or as some say, let's quantify things a bit :-) )

Shifeng worth about one third of a brand new Nissan LEAF. Used car market should be not much different either.

In brand new condition, this car is expected to do about 130km from a single charge. Not bad at all for a cheap car!

Highest speed is limited to 60km/hour but then again, if we are using the car for city driving (which is what it is best at), then how many meters and how many seconds do we get to drive more than 60km/h on our city roads ?

Like my good friend Thiwanka Wimalasooriya (He is the one who introduced me to this car!) has correctly pointed out, just two solar panels should be enough to neutralise the electricity bill increase that would caused by this car. Meaning a small investment like (Rs 160 000, at Solar Drive prices) should be enough to make one transport energy independent! That investment looks specially comfortable considering that we get to buy a brand new, full option car for much less than a Maruti or an Alto or even a Nano)

Full option.

Battery technology is Lead-Acid (Gel) there are 12 heavy batteries inside which accounts for almost half the weigh of the car. One advantage of Lead Acid is that it is bit more suitable for higher temperatures than Lithium batteries. This might be useful for climates like in here. Another is that Lead - Acid is relatively cheaper, and deep cycle batteries like these tend to last longer.

The particular car I bought has stuck on port for 3 years and hence the battery was degraded, still after 3 years of idleness it still retains, half the power. It remains to be seen whether we can improve the battery capacity with proper charging. My good friend professor NK Gunewardena certainly think so!

Another aspect is the ability to replace Lead-Acid with used lithium battery modules from Nissan Leaf cars. This will create a market for used LEAF batteries as well. At the same time, about 400kg of weight can be shed off from this car which battery capacity is increased. More of that will be covered in future articles, we hope one day a lithium converted Shifeng might beat a LEAF on range!

It's early days yet to write more on this... besides Thiwanka will write a good technical post with figures soon.

If a Shifeng or something similar to it take off, then our roads will become much cleaner, safer and we would harness more sunlight for our transportation and will be less dependent on polluting oil.

It's a worth goal to pursue for!

Friday, April 01, 2016

Poems, Lyrics and Theme Songs

This is a very short poem (if we can call it that) I have read a long time ago. 

The author has seen a proud pigeon walking about like a General, at the same time a hawk was circling above. One day this same hawk may gobble up the pigeon, but it's not this day and the pigeon has no scare or care for the hawk. This inspired the poet :

Let my hawk circle above me
We have still fight in us

-Mikhael Lermentov - 

The fighting spirit of which brings us to this modern classic. This is from the TV series 'firefly'

Take my love, take my land
Take me where I cannot stand
I don't care, I'm still free
You can't take the sky from me.

Take me out to the black
Tell them I ain't comin' back
Burn the land and boil the sea
You can't take the sky from me.

Leave the men where they lay
They'll never see another day
Lost my soul, lost my dream
You can't take the sky from me.

I feel the black reaching out
I hear its song without a doubt
I still hear and I still see
That you can't take the sky from me.

Lost my love, lost my land
Lost the last place I could stand 
There's no place I can be
Since I've found Serenity

And you can't take the sky from me.

This improvisation may sound little political, but it's not. Just take it as humour.. or as motivation because there are similarities.

If it is saving the world and protecting the environment that we choose as our fight, then it so far has being a loosing battle. Electric Vehicles were subjected to a huge and ridiculous tax all of a sudden, no incentive for Solar, forests are being cleared out, even the reserves, coal power plants being designed and built and so on...

Still, there are certain things politicians and big businesses can't take away from us...

Take my love, take my land
Take me where I cannot stand
I don't care, I'm still free
You can't take the sky from me.

Take me out to the black
Cut down trees, build coal plants
Burn the land and boil the sea
You can't take the sun from me.

Take out forests, kill EVs
Bulldoze what we already have
Lost my soul, lost my dream
You can't take the sun from me.

Sell out everything we have
Store paddy in airports
I don't care, I'm still free
And you can't take the sun from me.

Lost our jobs, lost our land
Lost the last place we could stand 
Bring ETCA and ruin it all
But you cant take the sun from me

Politicians, parties and governments come and go. They are not in this for us. 

Get an EV, go solar and never step inside a petrol shed or a CEB/LECO again. 
Save the environment and get your freedom as well while you still can, folks! 
After all, They can't take the sky (sun) from us!

Wednesday, January 27, 2016

Green Cars - A personal history from Prius to LEAF

Back in 2005 I bought a Toyota Prius car. Which was a time that type of car was rare in here. (1997 model of Prius. The very first commercial version of it intended to sell only in Japan. Prius started to get imported only in 2001) Since people generally were afraid of the new technologies I got a good price so I went for a second car of the same model before long. Those did work well till about 8 more years from that point... I think I did a little bit to promote greener hybrid vehicles. 

Compared to those insane risks, a EV buyer today is not taking much of a risk at all! You can find more about those past fun stories if you are interested, in Toyota Prius Car - Experiences from a long term user , part 2 of that and finally in here : What's Wrong With Prius ? 

Even though hybrids wasn't an end solution to the CO2 emission problem and getting totally away from petroleum, they did a nice transition in preparing peoples minds for what's coming. Thanks to hybrids people learned to appreciate and love greener features as well as getting rid of their fears for newer technologies.

Electric vehicles were a total game changer though. Even I didn't anticipate such progress in EVs in such short time. Credits should go to Nissan and Tesla. However, the first EV I was interested about was Mitsubishi i-miev (due to the example set by a good friend of mine), if not for few stubborn kids who didn't like the looks of that nice little car (kids have strange logic!), I would have bought one of those. As it was, I became a LEAF owner (entire director board at home was firm in this and I was over ruled). This was in April 2015 and once again I got a good price because I was just happened to be ahead by 2-3 months before LEAF started to become the fashion in here.

I always wanted to write a post on wonders of this cool car, tips and tricks, best practices etc but by now there are many forums out there and many people have done that already. People seem to be reasonably familiar with the car, those who are still new, we try our best to get them up to speed at our stations. Model 2012 seems to be the oldest which can be found in here. 2013 model came up with few significant improvements to battery, engine and software. However, 2014 and 2015 have no big differences compared to the 2013 model. 2016 model is supposed to come up with a 25% increase of battery power, so we can expect to increase the range by similar factor. If you are someone who get 160 kms from a fully charged battery, you are expected to get 200km from the coming model.

Nissan Models advertised for far into the future include 300km range, self driving etc. On the other hand Tesla says they will start producing cheap model 3 cars in mass starting from end this year while it is now almost official the silent giant Apple is designing it's own car in secrecy. Future look good!

So why should we get so excited about fully electric vehicles ? because they provide us a way to be totally away from fossil fuels. Once we get power from the grid, we could easily control things and optimize things. A mixture of Solar, Wind, Sea Wave, geo thermal, hydro and even nuclear could power our vehicles.

The mere thought of doing all our transportation using clear, clean sunlight one day.... saving the entire planet from the mess we have created. Isn't that a worthwhile goal to take few risks, to work a little harder and to dream a bit ?

Want to clarify doubts on the logic of arguments and cross check the numbers ? read here.

If you are still having doubts why it is worthwhile to bet your money on and take even a personal risk if needed and go for a EV, you can read this story about venus for motivation! :-)

It will be a much bigger risk for us all to not to go for a green vehicle!

Sunday, January 24, 2016

Is a Tesla car really a symbol of Green in here ?

In a previous post, we discussed RRR and how to spot fake environmentalists  damages they do and some associated mis conceptions.

That got us thinking....

I am a fan of Elon Musk and Tesla. It's a great car but it's not yet a car for the masses, it's a car for the super rich, even more so in here. It may be a symbol of green in California, but here in Colombo, it's a symbol of luxury, wealth, comfort and general poshness. There may be nothing inherently wrong in that list, however, greenness or environmentalism is certainly not one belong in that category. Remember, the first R, indulgence and luxury is bit far away from that. there has been some discussions in local circles recently about the time a Tesla taking for a full charge in a normal fast charging station here in Sri Lanka.

Here is our take on the matter : if a tesla comes to a GF network station, we would may be take few pictures of it, have a nice chat with the owner and have a good look at the car too, and we would enjoy that time but at the end of it, we will simply have to ask the car to get to it's home. (may be charge it a tiny little bit so it has just enough to reach the nearest park or it's home). We wouldn't block our fast charger which is still a scarce commodity (for the masses) for hours on behalf for someone who can easily afford one at home (if one could afford a Tesla, why not a 20kw personal charger ?)

Good Elon knows this, that's why he is designing the new model 3 which is supposed to be a car for the masses.

Now that one we WILL treat as a symbol of greenness along with other EVs. We are waiting to charge one...

Your thoughts ?

Pretending Environmentalists - Identify friends and foes of EVs

When the CEO of the company I was working in long time ago, was explaining about results of the latest funding round of the company (which was doing good at the moment), we asked who are the people who are in line to fund us so far. 'A flower attracts all sorts of insects, you know.." came the quick and entertaining answer.. we laughed.

If environmentalism is a flower (a fashionable one too these days), it attracts all sorts of insects right now. Some of whom are a help to the flower, some of whom help themselves but their activities either indirectly helping the flower or at least does it no harm. There are another category of insects which are just helping themselves in such greedy fashion that they are actually damaging the flower itself.

This remind us of that lion who said 'I love vegetarians!' False environmentalists are such that when they say they are environmentalists, what they really mean is that they want to make money out of environmentalism and from environmentalists. Unfortunately, some of those do it by so unethical and opportunistic ways that the process can only be described as more or less of a robbery. Taking advantage of, deceiving and robbing of environmentalists, can not be doing much good towards environmentalism.

There are many ways we can identify false environment lovers. One is the triple R. Well, the three good concepts of Reduce, Re-use, Recycle as put forward by Green Peace. Even though it sounds like simplistic, it in fact has a deep philosophy.

We can not  save our planet or the environment without some sort of reducing the consumption, simply because the planet has limited resources against a growing population who needs more and more. It's a philosophy in one end where our instincts of consuming more, going for luxury, more expensive and bigger has to be transformed into much softer and refined form of taste where we learn to appreciate the finer aspects of life and take joy in consuming sparingly. Learning to practice moderation in things against indulgence. It needs wisdom, intellect, education and self restraint. Such shift in mentality will create a long lasting and sure way of saving the planet. For such a society, concepts of re-use and recycle will also come naturally. In a way it's just a matter of being sensitive towards the world and others who live on it.

There can not be an environment lover without a person inside who is practicing reducing/moderation in things. If we are not keen in reducing, what chance we got to combat with carbon emissions, global warming or green house effects for example ? how to protect dwindling forests and habitats of others, depleting resources and fish in seas.. etc.

On the other hand it is very easy to spot businesses which has set up, designed and tuned to opportunistically make money out of environmentalists, EV lovers/owners, people who like to migrate to Solar power etc.

In case of EVs (as an example), cars are relatively new, owners are few and they all need charging options. Once you buy a car you need to rely on someone for fast charging. In developed countries, charging is available for free or at very low cost. In such cases, it is natural to do it via a membership scheme. Now, how are we to identify a business in these parts of the world where charging is not free, not even fair by the rate and still charging memberships as well ? In early days there will be fewer service stations, spare parts vendors etc.. If one is keen on making money at any cost one could use the early monopoly to raise pricing into such levels (knowing that the customers have limited choice) that it becomes almost a day light robbery but still legal and can get away with.

Can such people, organisations and businesses be categorised as green or environment friendly ? only common aspect between them and an environment lover is that they both deal in the same technologies and options. However, one is using those with the intention of helping the planet while the other is with the intention of making money only. A lion who deals with vegetarian animals is not a vegetarian itself! When the lion says he 'loves vegetarians' he means he loves to eat them!

Environmentalists and early adopters into new (green or not) technologies need to be careful of pretending 'environmentalists'. Their activities more often than not are more harmful to the good cause than activities of those who are direct foes themselves. Direct foes like Big Oil, pollutants, companies who defy conservation laws are easier to identify and hence easier to fight with in the long run. However, fake 'friends' who sneak in as environmentalists and then destroy emergence of new technologies and movements are hard to deal with and the amount of damage they do can be high too. Sometimes they may not aware themselves about the harm they do, but we need to.

Lets take another example.  If we consider the EV sector in here, it is a sensitive time. People were (at least before the budget) thinking of switching into but are cautious about charging points, cost of electricity, spare parts etc. Still the brave ones and early adopters along with environment sensitive individuals take the plunge. Imagine this sensitive environment and add a fake environmentalist into this fragile eco system. A one who says he is helping EVs and providing related services but at a very high cost so he can make maximum profits before the real competition sets in.

If the fake 'green' company managed to get it's way you will see high prices for charging, memberships and then higher cost for servicing and equipment. Now the traditional automative industry can easily point out to the high costs EVs have to go through and mathematically prove to the masses that EVs are actually more expensive to operate and own. In addition, lot of potential early adopters getting discouraged and move away from EVs just after having a look at the charging cost, service cost etc. If this goes on for a while and a fake(s) becomes a monopoly, the entire industry will die out before it even see the day light. That would be a nip in the bud even the petroleum industry would be proud of, if they managed to achieve it. Petrol car dealers would be happy too.

This is not an exaggeration. Here are some numbers if we need more proof to convince our selves. Imagine we charge Rs70 for a unit of electricity to charge a EV. Now, a single unit is normally will take us for about 7 kms. So the cost for one km would be Rs 10, and everybody knows a hybrid car and even a good petrol car would beat that. So for whom are we supporting by enforcing such unfair pricing models on EV owners ?

Imagine there is a Rs 5000 annual charging for EV owners. Is this membership fee is to develop the charging infra structure ? if so, what exactly is and where is that infrastructure after all these months ? That money has clearly went on as personal profit for someone. All though we could argue whether that's a fair/ethical business or not, there shouldn't be an argument at all whether that's a environmental friendly business or not. This is the way to kill EVs, not the way to promote it!

How do other countries and communities deal with such fake do gooders ? there is one recent example which comes to mind where a pharmaceutical company tried to raise the cost of a drug in such a huge magnitude that it caused an outcry world wide. Public awareness has resulted in total failure of such evil attempts by that company that they received swift justice. You can follow the story in here. In that example, even though that company was a pharmaceutical company dedicated into that field including research, they were clearly not an asset or a positive for the improvement of healthcare of people.

Martin Shkreli is the founder and chief executive of Turing Pharmaceuticals, 
which raised the price of the drug Daraprim to $750 a tablet from $13.50. 

CrediPaul Taggart/Bloomberg, via Getty Images

Likewise, just because someone is in the EV sector, doesn't make them green. Just because someone has to unwillingly drop their bad habits and pricing models temporarily due to public outcry, doesn't make them green or good all of a sudden. History, is an indication on where the real motives are.

Monday, December 14, 2015

A Tale of Two Planets - our Doomsday prediction and the way out.

We have heard about climate change, global warming, green house effect etc.. but among the general noise of work, advertisements, entertainment, gossip etc they also fade away as any other topic would. In todays well connected, busy and distracting world, nothing can maintain the scope or be in the center of attention for more than a week.

There are other philosophical questions/thoughts as well about who we are and what our goals, purpose are but they too have no chance keeping up with the changing, dynamic, eventful busy world. Human mind has this weakness.. even if it manages to identify what is the essence, most important issues and priorities (once in a blue moon that is).. it cant stay focused on those priorities for much long. If we finally manages to have a long term focus on something, they are usually the less important things like jobs, careers, profits etc.

How dare we say things like careers are less important ? Well, they are less important because there are simply more important things than them, whether we like that or not. However important they may be, once in a blue moon realizations don't have much more of a chance than a snow flake in hell to compete (in terms of grabbing and sustaining the attention and focus of our minds) against day to day issues, matters like economies and careers, gossip, news, hobbies. So we fall back to maintain the status quo and life goes on as usual....

However, there are those rare times when u hear a story..... stories are powerful. A proper story connects with you and your beliefs and values in a way that the message get sinks in like no other. These stories change the world.  Some of Ted Talks have done that for few people, so I have heard. Some of powerful speeches from influential people have done that for some others. It could be Martin Luther Kings 'I have a dream', or Mahathma Gandhi or Steve jobs 'connecting the dots' to some. For most of us, we probably haven't heard the story meant for us, not yet!

This is about such a story... I heard a part of it first from 'Cosmos' TV series from Neil de Grass Tyson

I later read the essence of it in the form of a quote from Elon Musk

See whether this is the one which was waiting for you!

Story goes like this....

Venus and Earth are sister planets, in that they are very similar to each other. They are close, about the same distance to the sun, similar sizes with hard surfaces and an atmosphere. Similarities were much numerous several hundreds of millions of years ago.

Like its sister Earth, Venus also was a beautiful planet. It had its own nice blue oceans of liquid water. It was a heavenly planet, conditions were very close to that of bearing life. However, there were violent volcanic actions on Venus which continuously put billions of tons of Carbon Dioxide into the atmosphere. Carbon Dioxide levels in the air contributed to Green House effect where the sun light could come through the CO2 layer into the planet but can not get out of it, and hence it traps suns energy, raising temperatures higher and higher. much like how the high temperatures are maintained inside green houses.

When green house effect reaches certain level it becomes like a chain reaction, leading into rapid temperature rises, we call it a runaway green house effect. This is exactly what happens to the Venus, rising temperatures made the sea water evaporate into atmosphere and then leaked away slowly into the space. Venus never saw water again, and the beautiful blue oceans were no more. Meanwhile temperatures rose even faster... Fast forward to few hundreds of millions of years to the present day and we see Venus today is a much hotter planet than even Mercury (which, as you know is much closer to the sun). With high temperatures Venus has a high atmospheric pressure as well. It's dry, hot and very inhospitable to life. A hell, in short....

This was the natural path which was set for its sister as well. Earth also has high volcanic activity those days and writing was on the wall basically. However, a nice twist of things happened here on earth. A thing called trees appeared!

Trees had this habit of taking Carbon Dioxide out of the atmosphere, releasing Oxygen back and storing Carbon in its bodies. Rapid expansion of Trees meant slowly Oxygen levels in the atmosphere rose while Carbon levels were kept in check.

Of course the body of tree eventually die, decompose and Carbon Dioxide (via the activity of micro organisms) will go back into atmosphere. However, this decomposing process is much slower compared to expansion of trees, by the time one decompose, several more tress would grow into take more Carbon Dioxide out.  More importantly, large parts of Trees and Animal bodies got trapped beneath the earth surface and got stored as hydrocarbons. Since this was below the surface these carbon stores were there for millions of years. This made the carbon cycle to break and atmospheric carbon levels never grew into threatening levels capable of creating a green house effect.

Therefore, success of life as we know it on planet Earth is very much indebted to the fact that carbon being stored below earth surface (due to the activity of trees) without getting it into the atmosphere.

Without this storage, earth too would have very well followed its close sisters path.

Unfortunately, this is exactly what we have been reversing in past few decades. In our moment of madness and greed, we are digging up buried carbon, bringing them back up to the surface and burn them into the atmosphere! Currently we add as much as 40 billion tons of carbon dioxide into the atmosphere every year!

Now to the dangerous runway green house effect.. this is the chain reaction when one thing leads to more of the same, until the cycle becomes unbreakable and too late to stop. We are seeing signs of it even now.. increased temperatures mean less ice in polar caps, less ice means less sun light reflected back into space, means further increases in temperatures. Methane (an even more dangerous green house gas than carbon dioxide) buried in the bottom of sea bed get released when sea water reach certain high temperatures, Methane trapped in perma frost get released when those areas in siberia get defrosted... etc. Once these actions reach a certain tipping point, there is no way back and it will be too late to reverse..

Imagine Venus... a hot, boiling, barren hell which was once a beautiful planet with a blue ocean.

Elon Musk has summarized this as follows.

"Burning Fossil Fuels Is the Dumbest Experiment in History, By Far."

Changing the chemical composition of the atmosphere and oceans by adding enormous amounts of CO2 that have been buried since the Precambrian Era is a crazy experiment indeed.

Once we see fossil fuels in this angle, we can never go back and see it as a precious resource or as 'black gold' anymore. The most important and possibly the only real use we can get from Fossil Fuels is to keep them safely buried under the ground, never to be dug up ever again! 

The greatest challenge in our generation is to battle climate change. That is to reduce and stop carbon emissions. In other words, to get away from fossil fuels! This is the most glorious battle field there ever can be in our generation, where heroes will be made and villains will be defined. 

Friday, December 04, 2015

DC fast charging, how bad are you really ?

This post is for electric vehicle owners and fans. The question asked is a frequently asked question in forums and discussions. I guess it is also one of those nagging questions every vehicle owner silently asking himself every time he/she waiting at quick charge station while the green car silently filling itself up...

There is a reason why this question is so frequent, it is because the EV industry, powerful all electric car batteries (they are generally more powerful than hybrid vehicle batteries) and specially the concept of fast charging at commercial scale were still a recent phenomena that there hasn't been enough time to do conclusive testing and arrive at conclusive answers.

However, this is no longer the case. Recently several research, tests and analysis with medium term data collection has been done, to such a degree that we now do have some data to answer this question. Yea, there could still be some nagging minor doubt here and there on exact numbers, but in general the question can be reasonably evaluated.

In older days (about 5 years ago or more), understanding was that fast charging may damage the battery a bit over long time but no one was sure by exactly how much by over 8-10 years of usage, since lack of data. Nissan and Tesla both now seems to be thinking that the long term battery degradation due to quick charging is not as bad as previously thought. Infact they now think that the total number of miles travelled is the main factor affecting battery life than the method of charging (L2 or L3). You can see this by comparing Nissan Leaf owners manual (UK) in 2011 with the one they issued in 2015

 2011 LEAF owner's manual:
Use the normal charging or trickle charging methods to charge the Li-ion battery and minimize the use of public Fast Charge or Quick Charger.
Avoid exceeding 70-80% state of charge when using frequent (more than once per week) public Fast Charge or Quick Charging.
NISSAN recommends that quick charging not be performed more than once a day
2015 LEAF owner's manual:
NISSAN recommends using normal charging for usual charging of the vehicle. Use of quick charge should be minimized in order to help prolong Li-ion battery life.
Avoid sustained high battery temperatures (caused, for example, by exposure to very high ambient temperatures or extending highway driving with multiple quick charges).

Note how soft the wording in 2015 version of the manual (compared to strict warnings in 2011), also they are putting more emphasis against high temperatures instead. Nissan web site actually goes further and even recommends fast charging.

See here Note this section specifically.


Rapid Charging at electric car charging stations allows a LEAF to charge from 0% to 80% in approximately 30 minutes.  Available across almost the entire UK motorway network, you can also find them in Nissan Dealerships, IKEA and Waitrose, plus various other locations.

Nissan recommend the use of the Ecotricity Electric Highway as it’s currently free (you will need to register first) and provides access to a wide range of Rapid Chargers to help you on those longer journeys. For example, using the Electric Highway on a journey from London to Bristol could cost you absolutely nothing!"

Word "recommends" is now used without restraint but at the same time they have managed to sneak in the "0% to 80%" just to make sure! This kind of summarises the present understandings and research stats.

Infact, even as early as 2012, they have got bit bolder. Speaker here is Mark Perry, Nissan North America's Director of Product Planning. 

At first he uses strong assured phrases such as "Nissan is designed with fast charging in mind', "2-3 times of fast charging daily, no problem", "car is intelligent enough to protect it self" etc but when grilled, says there could be small percentage difference over 10 years, so the optimal is to charge up to 80% but still he maintains there is no significant damage in 100% charging (except 'small percentages over 10 year') and go for it if we really need it. 

This is another section from the manual :

  • Info on charging in LEAF Owner's Manual: "Overview" / "Efficient use of your vehicle" / "Li-ion battery life" section.
    Nissan recommends:
    • Only charging to 80% in order to maximize battery life:
      "Long life mode
      NISSAN recommends charging the Li-ion battery using the long life mode to help maximize the Li-ion battery useful life. Long life mode can only be set using the charging timer function. The long life mode is set by changing the [% Charge] to [80% Charge (Improves Battery Longevity)] using the following procedure.[7]
      Furthermore, the LEAF's warranty includes an exclusion regarding Li-Ion battery being charged full on a daily basis "despite the lithium-ion battery keeping a high state of charge level (98-100%)." [8]
    • Allow the battery charge to be below at least 80% before charging.
    • Avoid leaving vehicle for over 14 days where the battery charge state is zero or near zero.
    • Allow the vehicle and Li-ion battery to cool down after use before charging.
  • If vehicle will not be used for long period of time, NISSAN recommends charging with "long life mode" (charging only to 80%, see above) and to charge once every 3 months
Here, there is an important piece. Note that the 0-80% rule is a general health guideline which is applicable even for L2 charging! It is not associated with quick charging only.

Anyway, Nissan may be interested in its business and if the battery died after 8 years, the burden will be on users so we need some neutral party to come up with test data. Given that it is still 5 years since the launch of commercial level EVs, those are hard to come by.

I managed to find one such at following : (Let us know if you find more.) Here too they agree that the long term impact is not significant.

Another angle to look at the issue is to ask the question 'what happens at quick charging which may cause problems for the battery'. The answer is, high power is associated with high temperatures! High temperatures as we know are not good for batteries. Larger the power, higher the temperatures can go while charging. This is why no body even asking the question of damage due to slow L2 charging. (however the 'optimal' habit of not charging more than 80% applies to the L2 charger as well as mentioned earlier.)

Therefore, if we are really concerned, it would be prudent to minimize whatever damage and risk by using less power as possible. 40KW would be better than 60KW, 30KW would be better than 40, 20 would be bette than 30, and L@ charging would be safest of all etc but we can not wait long period to charge the battery if we are to use our cars in practical day to day usage. So at some point we will have to draw a line and find the correct balance between practical usage and ultra safety over long term.

Personally, I myself of the opinion that 20KW provides us that balance. It is fast enough for most of our requirements (I'm yet to find a case that it exceeds one hour for a charge), cheap enough to afford fair prices to EV owners, safe enough for batteries against high temperatures since it uses less power. However, I would not write off 30KW either.

Using beyond that (40KW or more), I think is a mistake for Sri Lanka. Here are the reasons :
1) Our grid provides only 60A max with 3 phase, beyond that you need a dedicated paid transformer.
2) If you go for such a transformer, then that huge cost will usually come to the end customers but why should EV owners pay for transformers ?
3) If you do not go for a transformer then you can draw only 60A, meaning your 40KW charger is actually under utilized. If thats the case, why should end customers pay more for power they are not even using ?
4) Risks associated with long term battery life. (however minor they can be)

To summarize then :
1) When possible, charge only up to 80% (whether it is L2 or L3)
2) If you really have to charge up to 100% to get the range, don't worry too much over it but at the same time, try not to do it too often either, just to be on the safe side.
3) let the battery cool down after the drive before charging. (since we know that the temperature is the enemy)
4) less power the better for the battery so whenever possible, use lesser KW if you are very concerned about long term battery life.
5) Reduce amounts of occurrences where the battery is discharged very low. If it goes too low, let it cool down a bit and charge. Dont keep the battery in Low of High charge states for longer durations.