Sunday, February 03, 2019

Lessons from EV fast charging in Sri Lanka and other stories. Part 1

Now that we consider our mission in Sri Lanka on EV charging is successfully concluded (we may still put a new charger or two but mostly will maintain the existing infrastructure and focus on some new area), thought of sharing some of things we learned about doing business in Sri Lanka especially in the field of environmentally sustainable solutions.

First, two little stories about "patriotism"

I met an old friend of mine who has a university science education as well as some business experience of his own as well. When discussing other things the topic turned towards the home solar energy solutions we do on a limited scale. The Solar Drive project. He asked why we don't try to manufacture solar panels in Sri Lanka. To him, it didn't look like a patriotic enough activity to import panels from another country and install solar systems in here. He actually was willing to postpone thinking about solar energy until the day Sri Lanka start to produce panels of it's own. Perhaps you also have a friend like this.

What should we call this attitude.. naive patriotism, extreme patriotism or is it just a lack of objectivity? While I do appreciate and share his passion to see things made in Sri Lanka, I'm simply amazed at the big picture being missed there. We are already wasting trillions of Rupeess worth of solar energy every year which fall upon our lands! If we could harness that, it could do following things :

1) Save billions of Rupees which would otherwise go to middle east.
2) Prevent environment pollution
3) Contributing to the battle against global warming and climate change
4) health benefits
5) Ability to run our vehicles also from solar power (via use of EVs)
6) Become a nation with near total energy self-sufficiency. (considering the amount of hydroelectricity and wind power resources we have)
7) A strong and stable local economy
8) Many business opportunities and new jobs for our youth in the solar market.

Considering all that and considering the fact that we are now losing all those benefits and wasting billions daily... Isn't it much better to import solar panels from whatever country which do it well and reach our primary goals?

There is the side of manufacturing as well. Solar panels are something which needs to manufacture in very high quantities to be profitable. Sri Lanka is not such a huge market for very large scale production. We also do not currently have the expertise in this kind of high tech products. China has such a stranglehold in the global market for solar panel production that even many US factories had to shut down due to not being able to compete with China on price. It would be naive indeed, to wait until the day we produce our own panels.

This reasoning applies to few other products as well. Electric Vehicles,  computer microprocessors, etc products which help us save money or generate revenue. It does not apply to luxury items, things we can produce in here, things we are already producing or many other products which we can easily do without.

BTW, our take on the future of Electric Vehicles in Sri Lanka can be found on here, if you are interested.

Another side story related to 'patriotism'..

This is a bit long and not all that pleasant as the first one, but gives a strong and useful lesson for someone who is new to business in Sri Lanka.

When we started EV fast charging, two other parties joined us and we together imported few fast chargers. We even got an easy payment option where we could pay some amount of the investment monthly within 6 months. Chinese factory has trusted us and issued chargers. Actually, all three of us got the easy payment scheme due to one party (let's call them A) and we (let's call B) managed to get a very good price quote from them. Both A and B have already bought chargers from this company before. Party C was totally new at this stage, they were just placed to benefit from this collaboration.

Unfortunately, once receiving the chargers, this party C, would not pay up as promised. He has suddenly become a patriot and would say things like "saving Sri Lankan Rupees from going to China", safeguarding people from buying 'low quality' Chinese chargers etc. after more than a year of delay, the Chinese company got frustrated and stopped support services for all 3 of us. Whole EV network in the country was facing a shutdown. Two remaining parties in our collaboration (A and B) then went to China alone and settled payments and got the support and trust back. For us, they even awarded the sole agentship for Sri Lanka. The party which would not pay up was finally forced to pay after a few more months of delay. They also asked for agentships and training etc but the Chinese company who by now knew what's happening didn't give them any. From this day onwards they have stopped any more easy payment schemes for whole Sri Lanka for all their businesses. Ironically, this was the end result for the country which came out of 'patriotism'.

Now, if we bought something from someone and came to an agreement, we have to pay up as promised. It is laughable to think about the country losing foreign exchange only at the time of paying up for the things we already bought.

It did not stop there. When we developed charger automation kits, the same individual asked us to install these on his chargers too. We did and he again did not pay up, to this date, did not even return us our equipment back. Now that he does not have an automated system, he has adopted another tone. His new tone then was that: EV charging automation and self-service systems are bad, manual operators are the best thing, charging networks are bad and not necessary, people should not buy access cards etc..  in short, grapes are sour. Indeed!

These experiences got us thinking... there is a thing called getting fooled by own propaganda. After a  while, liars start to think that they are actually telling the truth!

Patriotism is something one should show by their own actions, no need to advertise it in words. Those who talk about patriotism but do not have anything to show for it in their past actions... well, it's better for others to be a bit careful from such people. Patriotism also is not an excuse to cover up a lack of objectivity or common sense.

Working towards achieving even a little thing is far better than just wishing we have everything but doing nothing towards achieving anything.

Not to say that we do not have real patriots among us, we do. We wouldn't have managed to defeat terrorism and save the country if we didn't have any, for instance. Just that real patriots don't have to shout out loud and advertise it, because they have their own past actions and achievements to show for it.

Until we meet from part two... What's your take on this?

Sunday, January 27, 2019

Outlook - The future of electric vehicles in Sri Lanka.

Now that the Green Frontiers mission we started in December 2015 has reached it's objectives, the fast charging network of the country is reasonably spread out covering most of main routes and main outstation locations... and we have maintained and kept all this alive for more than 3 years. Moreover, this was done while keeping to low rates of Rs 50-60 rate and without enforcing membership fees.

It's now time to evaluate what's the impact has been and what lies for the future of EVs in the country.

EV s on their hey day - @ Green Frontiers, Battaramulla -

For the moment, it looks like charging and range anxiety is not as big issues as they were. There are few new players who has entered into fast charging, CEB is also there. Several people are experimenting with battery solutions, Service providers and spare parts vendors are emerging etc.. Petrol vehicle taxes have gone up. One may think EVs might make a comeback. However, the looks can be deceiving...

With the help of many partners and brave individuals and support from the community, we may have managed to prevent EVs from totally collapsing for 3 years, without any government help, but that's all there is to it. There is a limitation on what few individuals or an organization can do, in the absence of a national policy and active government help. Everywhere in the world where EVs has succeeded, that has happened only with active government help. EVs has not thrived in anywhere yet, without some form of state help.

In Sri Lanka, EVs have started to come in numbers in 2015 when the import tax was just 5%. By around end of that year, the number of pure electrics and plugin electrics were around 4500. Then in November 2015 budget, the government has introduced the draconian new EV tax which suddenly penalize an EV import to as much as 50% of CIF value. Subsequent budgets and ministers boasted they have helped EVs but they were only number games. Final actual tax was always around 40-50% and to this date, the total number of EVs in the country stand only around 5000. The progress was virtually stopped in November 2015 and remains the same.

When new arrivals of cars are scarce, any new investor, service provider or business will think twice before entering into EV sector. Market growth, which is a key indicator of any business analysis is simply not there. With this background, it is unavoidable that even the existing EV related businesses to be winding down. Fast chargers do not have enough cars on roads to sustain their business, once the existing chargers which are outside of warranty periods (that is most of the chargers in here) need to import parts to replace broken ones, most investors are bound to ask the question whether it's worth it. Same goes for other areas of support. New battery replacement related experiments and investments might also slow down. All this would affect the second-hand car market of EVs -which is already struggling- in a very adverse manner.

All above issues will be non existant and EVs would thrive if only the EV tax is reduced at least partially. Therefore, the future and sustainability of EVs in here is going to be critically and directly depend on this years budget which is due in few days/weeks. Without a noticeable reduction of the EV tax, this environmentally vital sector will face a certain slow and painful demise in this year itself.

One may think, there are other helps the government can do. We do not believe so. Most things some expect the government to do are actually not beneficial and even damaging. For instance, CEB has started put up fast chargers, one may think this is a good move, but this is Sri Lanka and here's how the situation will play out in the end. We are a notorious country for government waste, mismanagement and corruption. Sri Lankan Air lines, Mihin Lanka, Railway, CTB, Ceypetco, CEB are just few examples. One minister has said once that the total problem of Sri Lankan economy can be equated to the loss at CEB. Ceypetco, Sri Lankan airlines and other organizations listed also are very much capable of profit making but instead, they remain as burdens on tax payer and huge black holes which gobbles up our resources. Why ? the reason is that governments can not do business.

Let's take fast charging. Very expensive brand of fast chargers arrived years after the tender proceedings, installed many months after arrival, some says that even the warranty periods are now expired. Some stations are still not even operational. Even if they become operational, how long they would remain so, who would take care of maintenance and proper operations? will a government institute which has other high priority tasks put on them will be passionate and dedicated to operating charging stations fluently for a long time? experience on our government service tells us otherwise. This is no body's fault. A government is inherently not suited do businesses.

One day, there is a good chance that these expensive stations will be tendered and sold out cheaply due to small maintenance issues accumulated over many months and that would be a tremendous waste of public money. If the government or the CEB really wanted to encourage and promote EVs in here, they could have simply, granted a favorable electricity tariff to charging stations. proper supply lines which don't cause voltage fluctuations and equipment damage. While one department of the government is putting a tax and preventing EVs from coming here, another department of the same government is importing and putting up fast chargers for those very EVs the first department is discouraging!

So it's our understanding and experience that the only and most effective way for the government to encourage and promote EVs in here is by reducing the import tax. Nothing else is needed and anything else will not be as effective. When more vehicles start to come, other services will naturally appear and develop. There is no need for the government to take the burden of importing batteries, putting up fast chargers, service stations etc. Those would just be avenues for public money wastage only. Government's main job is to provide legislation, policy and overseeing of proper implementation of those policies.

We have done our best for the past 3 years to keep things together... the ball is now with the government, which is still not too late to save the electric vehicle.

Tuesday, June 12, 2018

විශ්මිත විද්‍යාව (2) - කාලය යනු කුමක්ද?

ආලෝකය සාධාරණය. ලොකු කුඩා, උස් පහත්, වේගයෙන් ගමන් කරන සහ හෙමින් ගමන් කරන, එය වෙතට සහ ඉන් ඉවතට ගමන් කරන, මේ හැමටම එකම වේගයෙන් නිරීක්ෂණය වෙයි.

මෙම දැනුම, මිනිස් සිතට සහජයෙන් ගෝචර නොවන එහෙත් වඩාත් වැදගත් සැඟවුනු රහසක් හෙලි කර දීමට උදවු වෙයි!

පසුගිය ලිපියෙන් ආලෝකයේ වේගය, එහි උත්පාදකයේ වේගයෙන් සහ නිරීක්ෂකයාගේ වේගයෙන් බාහිරව පවත්නා නොවෙනස්වන විශ්වීය නියතයක් බව දුටුවෙමු.

ආලෝකය මෙසේ හැසිරෙන්නේ අපට ඒ බව විශ්වාස කිරීමට පවා නොහැකි විටදීය. නමුත් අපි හැමදාම විශ්වාස කරන, නොවෙනස්ව හැමටම එක සමාන ලෙස සලකන බවට කවි පවා ලියැවෙන "කාලය" සැබැවින්ම අපි සිතන තරම් සාධාරන නැත. අපට සිතාගැනීමට පවා අපහසු වුවද, කාලය එකෙනෙකාට වෙනස් ලෙස සලකන බවත් වෙනස් අවස්තාවලදී වෙනස් වේග වලින් ගමන් කරන බවත්, ඔප්පු කර පෙන්විය හැකිය.

ඉහත රූපයේ වම් පස (a) සිටිනුයේ වේගයෙන් යන රොකට්ටුවක සිටින වාසනාවන්ත තැනැත්තෙකි. ඔහුට ඉහලින් සහ පහලින් ඇති කන්නාඩි දෙකක් හරහා හුවමාරු වන අලෝක කිරණයක් ඇත (ලේසර් කදම්බයක් ලෙස සිතමු ). යටින් ඇති බල්බයෙන් පිටවන එය ඉහත ඇති දර්පනයෙන් පරාවර්තනය වී නැවත පහලට පැමිනෙයි. රොකට්ටුව තුල සිටිනා මිනිසාට මෙය ඉතා පැහදිලි ලෙස දිස්වෙයි. හරිම සරලය.

දැන් දකුනු පස (b) බලන්න. මෙහි පෙනෙන්නේ පොලොව මත සිටිනා (අප වැනි ) අවාසනාවන්ත අයෙකුට ඉහත කී සරල සිද්ධිය පෙනෙන සැටිය. එම සිද්ධියමය. නමුත් ආලෝක කිරනය බිම සිට උඩට ගොස් ආපසු එනවාට අමතරව, ඉදිරියටද ගමන් කර ඇත. ඒ ඇයි? රොකට්ටුව ගමන් කර ඇති නිසාය. ඇතුලේ සිටින අයට නොපෙනුනත් එලියෙ සිටින අයට මෙම සමස්ත චලිතය පෙනෙයි. රොකට්ටුව අපට සාපේක්ෂව  චලනය වෙන බැවිනි.

පොලොවට සාපේක්ෂව මෙම ආලෝක කිරණය වැඩි දුරක් ගමන් කර ඇත. රොකට්ටුවට සාපේක්ෂව නම් ගමන් කර ඇත්තේ අඩු දුරකි (ඉහලට සහ පහලට පමනි). නමුත් මෙම දෙදෙනාටම නිරීක්ෂණය වන ආලෝකයේ වේගය එකමය. (පසු ගිය ලිපියට අනුව, අලෝකයේ වේගය සෑම නිරීක්ෂකයාටම එක සමනය ) වේගය යනු දුර බෙදීම් කාලය වේ. a සහ b දකින ආලෝකයේ වේගයන් සම විය යුතුමය. නමුත් දුර පැහැදිලි ලෙසම වෙනස්ය. b ගේ දුර වැඩිය. එසේ නම්, b ගත කර ඇති කාලයත් වැඩි විය යුතුය. එකම සිදුවීම එකම වර සිදුවන මුත්, b ට වඩා හෙමින් a ට කාලය ගතවෙයි. (වාසනාවන්ත යැයි කීවේ එනිසාය) වේගයෙන් ගමන් කරන විට කාලය හෙමින් ගමන් කරයි.

රොකට්ටුව තුල සහ පිටත ඔරලෝසු දෙකක් තිබිනි නම් සහ ඒ දෙකම එකවර ක්‍රියාත්මක කර එකවර නතර කරන ලද නම්, අතුලත ඔරලොසුව අඩුවෙන් ගමන් කර ඇති බව පෙනෙනු ඇත. මෙය සැබැවින්ම සිදු කර ඇති පරීක්ෂණයකි. ඉතා නිවැරදි පරමානුක ඔරලෝසු අජටාකාශ යානා මත තබා පොලොවට ආපසු සසඳා තිබේ. රොකට්ටුව ඇතුලත කාලය ගමන් කර ඇත්තෙ හෙමිනි.

පෘතුවිය තත්පරයට කි.මි. 30 ක වේගයෙන් යන රොකට්ටුවකි. සූර්ය ග්‍රහ මන්ඩලය තත්පරයට කි.මි. 230 ක වේගයෙන් යන රොකට්ටුවකි. විශ්වයේ අපි සියල්ලෝම නොයෙක් වේග වලින් ගමන් කරමින් සිටින්න්නෝ වෙමු. සාපේක්ෂව වැඩි වේගයෙන් ගමන් කරන්නා අසලදී කාලය හිමින් ගමන් කරයි.

ඉහත රූපයේ සිදුවීම නිරපේක්ශ කාලය නම් සංකල්පයෙන් බැහැර වීම මගින් පැහැදිලි කිරීමට මුලින්ම නිර්භය වූයේ අයින්ස්ටයින්ස්ය. අනෙක් හැමෝම කල ලෙසට, කාලය නිරපේක්ශව තබා (අපගේ ඉන්ද්‍රිය ගෝචර මනසට අනුකූල වන ලෙස ) අලෝකයේ වේගය සාපේක්ෂ ලෙස ගෙන මෙය විසඳීමට නොහැකි වූයේ එය පරීක්ෂණාත්මක දත්ත හා නොගැලපුන බැවිනි. එකල පරමානුක ඔරලෝසු සහ රොකට්ටු නොතිබුනත් මීට ඉහත ලිපියේ පරිදි මිචෙල්සන්-මොර්ලි පරීක්ෂණය මගින් අලෝකයේ වේගය නියත බව පෙන්නන ලදී.

දත්ත සහ තර්කනය සමඟ නොගැලපෙන විටදී ඉන්ද්‍රිය ගෝචර මනසේ සීමාවන්ගෙන් බැහරව තර්කානුකූල විසඳුම් දෙසට නොබියව පිය නැගීම මගින් සාපේක්ෂතාවාදය ලොවට හඳුන්වාදීමට අයින්ස්ටයින්ට මෙසේ හැකිවිය.

අපගේ ඉන්ද්‍රීය ගෝචර මනසට ගෝචර වන ලෙසම හැසිරීමට විශ්වය බැඳී නොසිටී. ඉහත සිද්ධිය දැන් අයින්ස්ටයින් මුලින්ම කල ලෙසට සරල ගණිතයෙන් පෙන්වමු. විශ්වයේ භාෂාව ගණිතයයි.  මෙයට අකමැති අයට ලිපිය අවසානයේ ඇති ගැටලුව වෙත කෙලින්ම යොමු වීමට හැකිය.

   (වම් පස දී නිශ්චලව සිටින්නාට අනුව කාලය t යනු දුර බෙදීම වේගයයි.)    1

 (දකුනු පස, ගමන් කරන්නාට අනුව කාලය t')                                        2

දැන් පයිතගරස් ප්‍රමේයය අනුව

{\displaystyle D={\sqrt {\left({\frac {1}{2}}v\Delta t'\right)^{2}+L^{2}}}.}                                                                         3

ඉහත සමීකරණ 1, 2, 3 විසඳීමෙන්

{\displaystyle \Delta t'={\frac {\Delta t}{\sqrt {1-{\frac {v^{2}}{c^{2}}}}}},}

මේ අනුව ගමන් කරන්නාගේ කාල ප්‍රමාණය (t) නිශ්චලව සිටින්නාගෙ කාල ප්‍රමාණයට (t') වඩා අඩු බව පෙනෙයි.

1 ගැටළුව : 
ඔබ අලෝකයේ වේගය මෙන් අඩක (c/2) වේගයෙන් ගමන් කරන රොකට්ටුවක නැගී වසර 10 ක් ගමන් කර, නැවත පෘතුවියට පැමින සිටී. පෘතුවියේ සිටින ඔබගේ මිතුරන් (හෝ සතුරන්) වසර කීයක් ගත කර තිබේද?  

2 ගැටළුව :
ඔබ 300 ක වේගයෙන් ගමන් කරන අතර ඔබගේ මිතුරා 200 ක වේගයෙන් ඔබ දෙසට එයි. පසුකර යන මොහොතේදී ඔබ දෙදෙනාම අනෙකාගේ ඔරලෝසුව කැරකෙන වේගය බලා එය තමන්ගේ ඔරලෝසුව කැරකෙන වේගය සමඟ සසඳයි. ඔබ දෙදෙනා ගේ සැසඳීම් වෙන වෙනම කෙසේ වේද?

දින කීපයකින් පිලිතුරු සඳහා කොමෙන්ට්ස් බලන්න. එමෙන්ම ඔබගේ පිලිතුරු සහ අදහස් කොමෙන්ට්ස් වල පල කරන්න.

මීලඟ ලිපියෙන් තවත් විශ්මිත විද්‍යා සොයාගැනීමක් සමඟ හමුවෙමු!

Monday, June 11, 2018

විශ්මිත විද්‍යාව (1) - ආලෝකයේ වේගය ගැන අප නොදත් දේ

ආලෝකයේ වේගය තත්පරයට කිලෝ මීටර 299 793 (සැතපුම් 186 000) බව අපි දනිමු. එහෙත් ඒ කුමකට සාපේක්ෂවද?

දුම් රියක් අප දෙසට තත්පරයට කි.මි 100 ක වේගයෙන් එනවිට අපත් ඒ දෙසට තත්පරයට කි.මි 10 ක වේගයෙන් දිවුවොත්, දුම් රිය අප වෙතට එන සාපේක්ෂ වේගය කි. මි. 110 වන බව අපි දනිමු.

අපගේ පෘතුවිය තත්පරයට කි.මි  30 ක වේගයෙන් සූර්යයා වටා චලනය වෙයි. සමහර විට සූර්යයා දෙසටත්, අනෙක් අවස්ථා වල ඉන් ඉවතටත් වන විටදී (ඉලිප්සයාකාර චලිතයක් වන බැවින්) සූර්යයා සිට එන ආලෝකය (මෙම වේගයට අපි මෙතැන් සිට c යැයි කියමු.) c+30 සහ c-30 වේද?

අපගේ සූර්යා ( අපත් ඇතුලුව ) ක්ශීරපථ මන්දාකිනිය වටා  තත්පරයට කි.මි  230 ක වේගයෙන් චලනය වෙයි. දැන් ඈත තාරකාවක සිට අපට එන ආලෝකයේ වේගයට කුමක් වේද? ඒ මදිවාට, අපගේ ක්ශීරපථයත් පැයට සැතපුම් 250 000 ක වේගයෙන් ඇන්ඩ්‍රොමීඩා  මන්දාකිනිය දෙසට ගමන් කරයි.

කොටින්ම කීවොත් විශ්වයේ කිසිම දෙයක් එක තැන නතර වී නොසිටී. සැමෝම තවත් යමකට සාපේක්ශව චලනය වෙති. මෙසේ වනවිට ආලෝකයේ වේගයට (c) පමනක් අර ඉහත කී පහසු නිරපේක්ශ අගය ලැබෙන්නේ කෙසේද?

මෙම ගැටලුව මීට අවුරුදු 110 ට ඉහතදීත් පැවතුනි. එකල පිලිගත් මතය වූයේ කම්පන තරංඟ ජලය ඔස්සේ ගමන් කරන්නා සේ, ශබ්ද තරංඟ වාතය ඔස්සේ ගමන් කරන්නා සේ, ආලෝක තරංඟ අවකාශය හරහා අප වෙත එන්නේ ඊතර නම් මාද්‍යයක් ඔස්සේ බවයි. එනම් විශ්වයේ සියල්ල ඇත්තෙ ඊතරය තුලය. එනිසා සියලුම චලිතයන් ඊතරයට සාපේක්ෂව සැලකිය හැක.

එසේම, සාපේක්ෂ ප්‍රවේගය ආලෝකයටද අදාල යැයි සිතන ලදී.

මිචෙල්සන් සහ මෝලි 1887 (Michelson-Morley experiment) දී ඊතරය තුල පෘතුවිය ගමන් කරන වේගය සහ ඊතරයේ අනෙකුත් ලක්ෂණ සෙවීම සඳහා වැදගත් පරීක්ෂණයක් කලෝය. එකිනෙකට වෙනස් දිශා වලට ගමන් කරන ලේසර කිරණ නියමිත ඉලක්කයකට පැමිණෙන කාලය ඇසුරෙන් පෘතුවියේ චලිතය ගැන අදහසක් ගැනීම අරමුන විය. පෘතුවි චලිතය එක දිශාවකට සිදු වන බැවින්, ආලෝකයේ සාපේක්ෂ ප්‍රවේගයේ වන වෙනස මැන ගැනීම මගින් අනෙකුත් නිගමන වලට පැමිනීම අපේක්ෂා කෙරුනි.

නමුත් සැමෝම පුදුම කරමින්, අපේක්ෂිත ආලෝකයේ වේගයන් නොලැබුනි. මෙතැන් සිට වසර 40 ක් පමණ මෙම පරීක්ෂණය සිදු කලද ප්‍රතිපල එකම විය. ඊතරය ගැන සෙවීමට කල මෙම පරීක්ෂණයෙන් අවසානයේ සිදුවූනේ, ඊතරයක් නොමැති බව තහවුරු වීමයි. නමුත් ආලෝකය සඳහා සාපේක්ශ ප්‍රවේගය අදාල නොවන්නේ ඇයි ද යන්න පැහැදිලි කිරීමට 1905 ඇල්බර්ට් අයින්ස්ටයින් (Albert Einstein) විශේෂ සාපේක්ශතාවාදය (special theory of relativity) ඉදිරිපත් කරන තුරු සිටීමට සිදු විය.

අයින්ස්ටයින් අලෝකයේ වේගය රික්තයක් තුලදී නියතයක් වන බවත් එය සියලුම නිරීක්ශකයන්ට එකම අගයක් වන බවත් දැක්වීය. වස්තූන්ගේ සාපේක්ෂ චලිතය මේ අනුව අලෝකයේ වේගයට බලපෑම් නොකරයි. මේ සඳහා අයින්ස්ටයින් උපයෝගී කර ගත්තේ ඔහුට ප්‍රථම මැක්ස්වෙල් (James Clerk Maxwell) සහ ලෝරෙන්ට්ස් (Hendrik Antoon Lorentz) වැන්නන් විසින් ඉදිරිපත් කරන ලද විද්යුත් චුම්බක තරංඟ පිලිබඳව වූ සමීකරණයි.

මෙයින් පසු, වේගයෙන් ගමන් කරන ගුවන් යානා මත සිට (ආලෝකය දෙසටත්, ඉන් ඉවතටත් ගමන් කරන විට ) ඉතා නිවැරදි පරමාණුක ඔරලෝසු ආධාරයෙන් ආලෝකයේ වේගය මැන ඇත. මෙම සියලු පරීක්ෂණ වලින් සියලුම නිරීක්ෂකයන් සඳහා (ඔවුන් කුමන වේග වලින්, කුමන දිශා වලට චලනය වෙමින් සිටියත්) ආලෝකයේ වේගය (රික්තයක් තුල ) සැමවිටම නියතයක් වන බව තහවුරු කෙරී ඇත.

මෙම ප්‍රථිපලය සාමාන්‍ය මිනිස් බුද්ධියට සහ පරිකල්පනයට අනුකූල නොවේ. නමුත්, සැම විටම මිනිස් මනසට පහසුවෙන් වැටහෙන ලෙස පමණක් හැසිරීමට විශ්වය බැඳී නැත.

ආලෝකයේ වේගය ගැන ඇති මෙම ගුණය හඳුනාගත් පසු විශ්වය සම්භන්ධව ඇති සැබෑ ලෙසම පුදුම එලවන සුලු, සහජ මිනිස් පරිකල්පනයට කෙසේ වත් ගෝචර නොවන, ඉතා රසවත් නව සොයා ගැනීම් කිහිපයකට මග විවර වේ. එයිනුත් වඩාත්ම සිත් අලවන ප්‍රහේලිකාරාත්මක සොයා ගැනීමක් ගැන මීලඟ ලිපියෙන් කතා කරමු.

Wednesday, May 16, 2018

Big brother sacrifices life for the younger. Near dead Leaf battery revives the Shifeng!

A near spent Leaf battery may have a SOH around 50%, It's range may have gone down below 100km, writings may be on the wall, yet it is still a powerful battery. It may not enough for the power hungry 80kw LEAF motor, but there are plenty other applications out there for those, it is still a very useful and powerful Li battery. 

This reminds us a selfless organ donor, end of one could be a new beginning for another!

In last post, (Here) we have heard about an old warrior who still got fight in him. Even earlier, we
 have posted about Chinese EV Shifeng (Here), which is lead acid battery. Now, today's post is
 about the final sacrifice by the old warrior.  

Used Leaf batteries are still a game changer for the 10kw little motor of Shifeng. This car had 12 lead acid battereis each weigh about 35 kg, a whopping 420kg in total which is about half of the total weight of the car itself! By changing these batteries for Lithium by a used Leaf, little one get several hundred kg of weight removed, a more powerful battery pack, ability to regenerative braking and also the faster L2 charging time. If that's not all, one day it may even enable fast charging!

This type of a converted Shifeng could even reach 200km of a range! not too bad for a small 

country like ours. So, if you are considering of removing your used LEAF battery, may be 
worthwhile talking to folks at Shifeng Owners group on FB, there might be a win-win 

When we visited Shifeng Facttory in Shangdong China, they were actually surprised to hear 

that not only we do lithium conversion in here, but on to Regenerative breaking as well! 

Therefore, this article will not be  complete without mentioning few names of individuals without their contribution, This progress in our country would not be there right now. 

Mr Bulathsinhala who is no stranger to EV owners has done me the conversion for just 
Rs 40 000/=  My friend, professor NK Gunewardena as always helped and encouraged this
transfer so much so that it finally happened even before the time frames I was planning myself

Mr Saman Malagama deserves a big praise for figuring out the regenerative breaking in Shifeng. 

Mr Priyantha Geeganage is another pioneer in providing battery services for both LEAF and Shifeng.

Our dear friends Thiwanka and Pratharshan also deserve some mentioning for all encouragements, help and knowledge sharing. 

Mr Nalaka Kumarapeli is another name which we might hear more in a future post!
Just to show that we have no shortage of expertise, technical know-how and human resources with us, here locally. There is no need to look abroad for solutions!

Next will be about a new battery solution for the LEAF. The Old warrior needs to be 


That may be for another post...

Monday, April 16, 2018

The old warrior who still got a fight in him.. Never say die!

This was brought to Sri Lanka exactly 3 years ago. At the time it said it has done only 7000 km. Fifty-Five thousand more kilometers later, it is now a veteran near 63000 km, with no less than 6 battery bars already gone!

How come 6 battery bars go down in such a low mileage? That's because this may be one of most tormented Nissan Leaf cars in the country.

It has been used to experiment, test, configure and troubleshooting, repair of most of Fast Chargers in the country. When Setec engineers came to meet and install our very first charger back in December 2015, this guy was extensively used to experiment and test it.

When it was charged 100% but the testing is not completed yet, we ran some distance to discharge the battery a bit so the charger can use it again. Whenever a new fast charger is installed or an existing one upgraded, repair, this old friend was obediently there to test it again and again, until the job is completed. We knew that's not the best usage scenario for the car battery but had no other option.
Most of its own battery life was sacrificed in the service of fast charging network in the country. I don't think it will mind it too much. Service definitely was not in vain! As a country, we now have one of best FC coverage in the world (certainly in the region!), not many countries can boast of this many fast chargers per car. (Those whol like to read about my previous experiments with green cars and what happened to them, reviews, You can read from the articles in this blog. Personal experiences on Prius and Shifeng.)

Anyway.. back to the story, I haven't used the car recently for long-term trips since I did not think it is capable of making them as it used to do in the past. After all, the battery is less than half it was used to be. This new year season forced us to use it once again for long-term trips and with great suspense, we started the journey from Galle, on new years day!

I was planning to charge few times along the way since the car was carrying 300kg of people and luggage as well. Yet, it exceeded 100km easily, even with a 6 bar down battery, carrying 300kg!

This guy needs a battery overhaul, I did not have the time to look into it for past few months even though we desperately needed that. Now, will look seriously into it.

That reminds me the first time I was looking for a fast charge for my car. At that time, I was told Rs 25 000 membership fee and then a Rs 70 per unit rate is required. We just decided to bring in 2 fast chargers of our own, break the monopoly, sell the fast chargers back and go on with our lives. At least that was the idea and the rest, as they say, was history. Those two fast chargers still providing service in the network which is now nearing 30 fast chargers. Both memberships and high rates are now a thing of past.

So, what will happen this time, when we try to replace batteries for the first time?

One thing is sure, if the existing solutions are not good/affordable enough, then we will create a new solution for all! Maybe the now battery depleted old warrior still has a part to play in that too. :-)
Only time will tell.....

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 ?