DougMarker
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Re: $20 Panasonic trickle charge mod allows 240VAC @ 12 amps

Sat Sep 17, 2011 9:11 pm

I can't wait for your plans. +1

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GeekEV
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Re: $20 Panasonic trickle charge mod allows 240VAC @ 12 amps

Sat Sep 17, 2011 9:21 pm

It's not about the money, it's about safety. I haven't looked at the circuits myself, nor am I qualified to do so. But, from everything I've read in the previous threads here about Ingineer's mods it seemed pretty clear that there ARE components rated at 120v in there. So, what I'd like to know (and have yet to hear the OP state, is how running those components over spec or bypassing them can be safe? Or is that we all were misunderstanding and there aren't 120v components in there? How can the OP know when he admits he hasn't depotted the board?

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garygid
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Re: $20 Panasonic trickle charge mod allows 240VAC @ 12 amps

Sat Sep 17, 2011 9:59 pm

jwallace3,

Is this a joke?

It seems to me, from the errors in your posts, that:
1. you do not fully understand the J1772 and NEC 625 standards.
2. you do not fully understand how the Nissan/Panasonic EVSE works.
3. you do not fully understand how electricity works.
4. also, you might be unaware of our "Weekend Project ..." thread
(where Chris has put a lot of good effort into designing,
building, and testing a full-featured EVSE).

If you have something, or anything, working,
why do you not say/show exactly what you did?
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JimSouCal
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Re: $20 Panasonic trickle charge mod allows 240VAC @ 12 amps

Sat Sep 17, 2011 10:10 pm

I have no idea what the factual issues are, but it makes for entertaining reading... My EVSE upgrade works fine, but so does my brain, at least most of the time, too. ;)

cdrews
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Re: $20 Panasonic trickle charge mod allows 240VAC @ 12 amps

Sat Sep 17, 2011 10:38 pm

jclemens wrote: jwallace3 please continue and you don't have to keep justifying to people with more money than brains.

+1 !

I never liked closed source stuff, and that is what ingineer is currently doing. I hope that we eventually get to where people with money can order a mod from commercial sources and the rest of us can mod it themselves (and learn from the mod).

Keep up the good work.

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Re: $20 Panasonic trickle charge mod allows 240VAC @ 12 amps

Sun Sep 18, 2011 1:50 am

garygid wrote:If you have something, or anything, working,
why do you not say/show exactly what you did?
Gary, if you had read his posts carefully, you would have seen that he said he would post pics and directions at a later time. Be patient, it's coming!
I agree with other posters that if someone can modify our Panasonic EVSE safely for around $20 instead of +$240, I'm all for it! :mrgreen:
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GeekEV
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Re: $20 Panasonic trickle charge mod allows 240VAC @ 12 amps

Sun Sep 18, 2011 3:09 am

It seems to me that the only way this could be done with "jumpers" would be to jump the two hot lines directly to the charge plug cord, then splitting one of them to power the circuit board (for the pilot line, etc.) by connecting the circuit board's neutral line to the ground pin of the 240v plug. This way the car could draw a full 240v, but the circuitry would still run at 120v. That technique certainly would work, but it would definitely bypass many of the EVSE's safety features, as the OP indicated was currently the case. That would also explain the current leakage previously alluded to if the neutral is being dumped on the ground line. If that's what's being done, I sure wouldn't do it - that seems way to risky. But until the OP does a more formal write up and submits it for public scrutiny, we're all just guessing. Maybe he's really on to something... :roll:

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mwalsh
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Re: $20 Panasonic trickle charge mod allows 240VAC @ 12 amps

Sun Sep 18, 2011 5:35 am

I'm with GeekEV - it sounds pretty hairy to me (and you already know that I'm a pretty hairy guy to begin with, so that's saying something). A very sober person told me once that a man has to know his limitations, and I certainly know these kind of mods are beyond my personal capabilities. So I think it makes sense for those like myself to send our units to an ingineer type vendor for modification.

On the other hand, if the OP is doing this competently (and with safety in mind), I encourage him to continue to showing us what he's up to. I mean, it's not like he's the first to take the road less traveled - we've had Chris Howell do his own thing for a L2 EVSE. And I know Robert Buaas was going to modify his own L1, rather than sending it to ingineer. But then, I believe both these guys are EEs!
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jwallace3
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Re: $20 Panasonic trickle charge mod allows 240VAC @ 12 amps

Sun Sep 18, 2011 10:58 am

Every time I attemp to write a response either my laptop dies, my 4 month old cries or my iPad dies. So this is my 4 attempt and I'll keep it brief for the time being since I'm on my iPad.

As for my first step, I did simply change out the pigtail and jumper the second leg of 240 to the output wire which was on the neutral lug. The ESVE only cares about current, not voltage. The car detects the voltage. The ESVE is just a smart extension cord. I did initially run my new jumper leg through the CT, but the charger didn't like that.

There are 2 paths in the ESVE, high current, and control. The charging path, from what I can tell, is perfectly capable of 240 VAC. The relays are rated at 250VAC with 12 volt coils so no issue there. The control path has a 120 to 20.9 VAC transformer. This is where the mod must take place. Since I'm not de-potting my board and tapping into the DC bus we need to insert some device which always delivers 20.9 vac to the board for the control. To make the mod easy and safe, the best way is to use a 4 wire 12 ga cable and add an additional relay. I have parts on order from digikey at the moment. Basically I plan on adding a relay with 1 form C (1NO/1NC)contact and a 240 coil. So the method will wire the first hot, neutral, and ground as originally wired, except the neutral will also be wired through the relay on the normally closed contact. The coil will be wired to both hots for 240 and the normally open contact on the relay will be wired to the other hot leg. The main contact on the relay will be wired to the white(originally neutral) wire on the J1772 cable. This always supplies the step down transformer with 120 so the control electronics don't burn up, and if 240 is present, the relay closes and applies the second hot leg to the J1772 connector allowing for 240 charging.

Right now i simply have 240 wired to the J1772 connector. One leg right now is always hot on the connector which obviously isn't ideal, but hey, so is any extension cord that you plug in right? It's not that terrible. The other leg gets closed in when the relay closes and charging begins. Very simple. My above plan is what I intend on doing in the long run for a mod. I already have input capture/output compare code written from another project that I am going to use to extend the pulse to allow for up to 20 amps. The charger only uses up to 16, however, if you want to use climate control while plugged up you will need the extra power. I am using a fresscale MC9S12 automotive grade microprocessor. I just need to build the circuit with proper resistances based on the J1772 standard. Right now, I'm just trying to finaize a cheap safe way to implement 120/240 charging. So far, it looks that the new 4 wire pigtail and 240VAC coil form C relay will do the trick.
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LEAFfan
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Re: $20 Panasonic trickle charge mod allows 240VAC @ 12 amps

Sun Sep 18, 2011 3:10 pm

jwallace3 wrote:Right now, I'm just trying to finaize a cheap safe way to implement 120/240 charging. So far, it looks that the new 4 wire pigtail and 240VAC coil form C relay will do the trick.
I really like your idea. Will it still only cost $20 for the parts? I would rarely use it as I haven't even looked at my 120V EVSE yet (June), but would be nice to use if my Blink goes on the blink. There could be a brick in there as far as I know.
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