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mhigley
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Re: Convert the 120v trickle charger to 240v on your own

Mon Apr 08, 2013 1:24 pm

brett701 wrote:Does Ingineer do what is described in the ebook that is on ebay?

http://www.ebay.com/itm/Nissan-Leaf-EVSE-Charger-Conversion-Handbook-/330785519678?pt=US_Adapters&hash=item4d045a783e#viTabs_0

If not. What is different?


To me the difference is that I (speaking for myself here) sleep very sound at night knowing that Phil did the job right and that nothing is going to go wrong.
Mark Higley

2012 Glacier Pearl Nissan Leaf
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cwerdna
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Re: Convert the 120v trickle charger to 240v on your own

Mon Apr 08, 2013 2:16 pm

brett701 wrote:Does Ingineer do what is described in the ebook that is on ebay?

http://www.ebay.com/itm/Nissan-Leaf-EVSE-Charger-Conversion-Handbook-/330785519678?pt=US_Adapters&hash=item4d045a783e#viTabs_0

If not. What is different?

Who knows? I'm almost certain he didn't write that material and I doubt he needed to refer to it. AFAIK, Ingineer did his own research, reverse engineering and engineering work to come up with this upgrade.

He was featured in http://www.nytimes.com/2011/10/16/autom ... wanted=all. He was doing this before he even owned a Leaf. When I 1st met him at Green Drive Expo on 9/17/11, he had been doing EVSE upgrades for awhile and had no Leaf yet. He didn't seem to have a desire to get one, at the time.

I was surprised to learn that he bought a Leaf around November 2011 from viewtopic.php?f=37&t=6721.

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thehelix112
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Re: Convert the 120v trickle charger to 240v on your own

Mon Apr 08, 2013 2:39 pm

It's kinda sad to see people discouraging the DIY spirit on here.

If someone wants to learn, and ask for help on this forum to experiment and play with their LEAF, it does them no good to hear that they just shouldn't try because it's hard, or because someone else has already done it. I'm sure Ingineer didn't come out of the womb a qualified EE, we all need to learn to achieve new things, which speaking personally, is what makes it worthwhile in the first place.

Now discussing the risks and potentials is great, but maybe a more positive, or even just informative, response would be better.

Dave

brett701
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Re: Convert the 120v trickle charger to 240v on your own

Mon Apr 08, 2013 2:41 pm

thehelix112 wrote:It's kinda sad to see people discouraging the DIY spirit on here.

If someone wants to learn, and ask for help on this forum to experiment and play with their LEAF, it does them no good to hear that they just shouldn't try because it's hard, or because someone else has already done it. I'm sure Ingineer didn't come out of the womb a qualified EE, we all need to learn to achieve new things, which speaking personally, is what makes it worthwhile in the first place.

Now discussing the risks and potentials is great, but maybe a more positive, or even just informative, response would be better.

Dave


THANK YOU!!!

brett701
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Re: Convert the 120v trickle charger to 240v on your own

Mon Apr 08, 2013 2:43 pm

thankyouOB wrote:bad plan.
i am not a fan of taking work away from Ingineer, who has done a remarkable and supportive job for all in the LEAF community.
his fees are reasonable and he offers plenty of support and free advice to all of us.

that said, do you really want to trust your vehicles charging system to homemade tinkering??


I don't consider it home tinkering. I will have a family friend who is a professional electrician assist me. He has been in the field for 30+ years.

However, I want to do the learning rather than pass the learning on to someone else and sit on the backside like a bum. I like to learn and this is very interesting to me.

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TonyWilliams
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Re: Convert the 120v trickle charger to 240v on your own

Mon Apr 08, 2013 2:47 pm

brett701 wrote:
thankyouOB wrote:bad plan.
i am not a fan of taking work away from Ingineer, who has done a remarkable and supportive job for all in the LEAF community.
his fees are reasonable and he offers plenty of support and free advice to all of us.

that said, do you really want to trust your vehicles charging system to homemade tinkering??


I don't consider it home tinkering. I will have a family friend who is a professional electrician assist me. He has been in the field for 30+ years.

However, I want to do the learning rather than pass the learning on to someone else and sit on the backside like a bum. I like to learn and this is very interesting to me.


If you seriously want to learn, build an OPENevse. Then, with your new found knowledge, try tackling the Nissan / Panasonic.

cwerdna
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Re: Convert the 120v trickle charger to 240v on your own

Mon Apr 08, 2013 5:04 pm

TonyWilliams wrote:
brett701 wrote:I don't consider it home tinkering. I will have a family friend who is a professional electrician assist me. He has been in the field for 30+ years.

However, I want to do the learning rather than pass the learning on to someone else and sit on the backside like a bum. I like to learn and this is very interesting to me.


If you seriously want to learn, build an OPENevse. Then, with your new found knowledge, try tackling the Nissan / Panasonic.

Tony's suggestion is a good one.

Brett, take a step back. Electrician does not necessarily equal electrical engineer.

Ask yourself and your friend these questions:
- Are either of you an electrical engineer or have the equivalent experience of an electrical engineer?
- Can either of you evaluate the design sold on Ebay BEFORE starting on the work on whether it'll work and whether it'll compromise safety (think fire and electrical safety) or violate some part of the J1772 standard and its protocols or NEC (National Electrical Code)?
- Do either of you understand the J1772 standard and its protocols?
- You realize that opening your EVSE voids its warranty, right? Do you know the replacement cost for a replacement L1 EVSE in case your modification attempt fails or the unit ends up being damaged?
- Do you know the replacement cost of the Leaf's OBC (onboard charger), in the event it is damaged by a poor/improper design?
- Do either of you understand ALL of Ingineer's responses in the viewtopic.php?f=26&t=11474 and viewtopic.php?p=133115#p133115 threads? If so, can you tell whether or not the design found on EBay has any of the same issues as those two proposals?
- Will the seller/author go to bat for you w/Nissan in the event any part of your Leaf like the OBC is damaged by your home tinkering and they deny your warranty claim?
davewill wrote:I'm all for saving a buck, but this falls under the "Penny wise, Pound foolish" category. I wouldn't buy this guy's "plans". If there were a set of public plans that had been well vetted, then maybe it would be OK, but the only public attempts I've seen on here have been pretty poorly thought out from the safety and compatibility POV. I wouldn't touch them.

If you REALLY insist on doing it yourself, then go the OpenEVSE route, which IS well vetted. It won't be cheaper than the upgrade, but you have the advantage of being able to build a more capable unit than the upgrade for much less than an equivalent commercial unit.

+100

Even an EVSE from a major manufacturer (namely the GE Wattstation), presumably w/many competent EEs has been an apparent culprit in damaging the Leaf's OBC. viewtopic.php?p=246900#p246900 is some speculation of the cause. There are numerous threads on the Wattstation and http://www.thetruthaboutcars.com/tag/wattstation/ has examples of some press coverage.
Last edited by cwerdna on Wed Apr 10, 2013 12:06 am, edited 2 times in total.

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mkjayakumar
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Re: Convert the 120v trickle charger to 240v on your own

Tue Apr 09, 2013 10:28 am

I told my son the other day that buying a Leaf is more like a science project for me. It satisfies me in more than one ways, not just taking me from A to B. Read through the technical discussions in here has become an obsession.
2011 Leaf, 30K miles, returned after 24 month lease.
Currently leasing 2014 Leaf SV.

dzd
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Re: Convert the 120v trickle charger to 240v on your own

Sat Apr 20, 2013 6:49 am

I disagree that building an OPEN EVSE would be more expensive than upgrading the Nissan L1. once you build your new OPEN EVSE you can sell your old one and probably come out the same, had he upgraded.

That being said, I almost want to buy that ebay book to see what the guy has...

kubel
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Re: Convert the 120v trickle charger to 240v on your own

Sat Apr 20, 2013 4:36 pm

I'm surprised people here are discouraging open mods. I think we should be saying "YES!" when people ask questions like this. Unfortunately, I don't have the details of how it's done, but you'll find plenty of info here:

viewtopic.php?f=26&t=5784

jclemens wrote:Is anyone still interested on how the upgrade can be done?

I've figured it out, without de-potting my board, AND keeping all safety features. (still needs more testing before I do this for someone else)

There are only 2 or 3 parts that need to be changed.

The 270V varistor is the most important, It has a marking of ZNR V10271U
The part number for this is actually ERZV10D271. It has a rating of 270V. The data sheet for this part is http://industrial.panasonic.com/www-dat ... 000CE2.pdf
It states that it is intended for 100-120V circuits.
Simply doubling the rated value seems to be working.
I wanted to swap it out for ERZV10D511, but the shop i went to didn't have the exact brand, so I used 0550NR07D (8mm instead of 10mm, rated for 550V instead of 510, green instead of black)

The other main part was the transformer, the power supply for the unit is a simple 7812 linear regulator, it CAN take DC, but you'd need at least 15V, I only have 12V AC-DC adapters, so I wired an AC adapter that works on 100-240VAC directly to the 12V output pin.
If I were to do this again, I'd use http://search.digikey.com/us/en/product ... ND/2203621

The last part is a little interesting. It has to do with those 2 diodes you can see. As we know, the unit detects if ground is present by intentionally leaking some current to the ground line. For some reason, it does this with DC, and has 1 diode from each AC input line. (hot and neutral). I tested to see if I could over-ride it and I could by simply injecting a small voltage to that resistor, but it was all unnecessary since the unit DOES NOT check/care which is live and which is neutral, but it does check if there is a complete circuit.
Initially I wanted to upgrade the diodes to 1n4004 (400V) rectifiers, (this is because standard diodes are rated in 100V increments, so they are likely only 200V) I also figured that by double the AC (with 240V) one would double the DC on the rectified side and thus double the small voltage it uses to detect ground, which may cause some problems. After I upgraded one diode, I figured, what do I need the other one for? it is only active when there is a voltage present on the neutral line, and the current goes to ground, not back into the AC circuit, so I removed the diode on the neutral line, so it will work with either neutral or L2, it is using Live or L1 to detect ground. Since L1 is only 120V, it probably wasn't required to upgrade this diode, but hey, I'm not going to fix what isn't broken.

WARNING, IF YOU ATTEMPT THIS AND SCREW SOMETHING UP, ITS YOUR OWN DAMN FAULT. YOU WILL BLOW UP LIKE IN DISTRICT 9, (don't ask me how I know)



I would recommend digging into OpenEVSE:
https://code.google.com/p/open-evse/

You can build your own there from parts (if you feel comfortable working on computers and solder, there's no reason why you shouldn't be able to do this), and that should get you started. I'm not an electrician, not an electrical engineer, but I am a geek. I think that gives me sufficient credentials to start digging into my own EVSEs. :)

cwerdna wrote:You realize that opening your EVSE voids its warranty, right?


You realize you are perpetuating a myth, right? ;)

They can only refuse to repair damages that you cause to the product, or that are caused as a result of the modification. Opening the EVSE alone will not void the warranty on the EVSE or the car. Using a modified EVSE does not void the warranty on the car either (unless of course it blows up and destroys something on your car, then they will refuse to repair THAT part).
2012 Nissan LEAF SV
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Leased 5-17-2012, Returned 1-15-2016


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