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Re: Bad news using my retrofitted EVSE with the LEAF :(

Sun Jan 16, 2011 5:04 pm

garygid wrote:Can you access the Control Pilot wire in your EVSE (that enters the e-hose)?

And the Ground?

Does the voltmeter have a 20v DC setting?

Can you do this without injuring or killing yourself?
Yes, yes, yes and yes.

"Help me, Obi-Wan Gary. You're my only hope." ;)
Green Honda EV Plus 02/1998-12/2003 plate "ZERO CO2" rip, Aptera 2e #726 canceled
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garygid
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Re: Bad news using my retrofitted EVSE with the LEAF :(

Sun Jan 16, 2011 10:06 pm

OK, attach the voltmeter, do the connect to car, etc. (or my test sequence) and record the DC voltage readings. Do the same test sequence taking AC voltage readings.

It "should" start and end with +12 volts DC, and 0v AV, before connecting to the car, ... but post your results:

Test step description, DC volts, AC volts.

What "Max Current" is your EVSE supposed to deliver?
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Re: Bad news using my retrofitted EVSE with the LEAF :(

Sun Jan 16, 2011 11:27 pm

OK, here we go, reading from pilot to ground with the volt meter and the pilot connected to the test circuit.

11.80 DC, 0 AC test circuit open
-0.76 DC, 11.03 AC test circuit connected with 2.74k resistor
-2.31 DC, 9.43 AC test circuit connected with 2.74k and 1.3k resistors (relays engaged)
8.77 DC, 0 AC test circuit connected with 2.74k resistor after 1.3k resistor removed (relays disengaged)
11.80 DC, 0 AC test circuit open

So the pilot behavior is certainly different once the relays are closed and opened the first time. I cycled the relays a couple of times by adding and removing the 1.3k resistor and the readings did not change back to the first reading until I removed the test circuit and added it back again. So what does it mean?

Max current from the EVSE should be 32 amps and the EVSE itself is rated for 40 amps.
Green Honda EV Plus 02/1998-12/2003 plate "ZERO CO2" rip, Aptera 2e #726 canceled
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garygid
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Re: Bad news using my retrofitted EVSE with the LEAF :(

Sun Jan 16, 2011 11:52 pm

The 8.7 DC, 0 AC would seem to indicate that your EVSE stopped generating the PWM signal (and went back to just a "+12v" output) when the 1.3K was removed (indicating "finished charging).

I believe that the LEAF expects the PWM to keep going in that "Power Off" state, as an indication that the EVSE is still willing to provide power. However, your EVSE turns the PWM off (and keeps it off), indicating to the EV that the EVSE is no longer willing to supply power to the car.

The J1772-2010 standards inducate that the PWM should keep going, but allowing the PWM to stop also appears to be permitted. However, the no-PWM indicates that the EVSE is no longer willing to "play" with the car.

So, it appears like (from this distance) the LEAF is properly expecting the PWM to continue, and is actually in spec with J1772-2010, but ... I cannot be absolutely sure.

You are located in Foster City?
Where is that?
Oh, between San Francisco and San Jose.
A bit far for me to visit.

One could do the same test on somebody's AV (or other 30-amp EVSE) to verify the "different" operation.

However, that does not solve your problem, or make the LEAF's Timer-Mode charging work as expected with EVSEs that behave like yours apparently does.

Edited to say EVSE appears to be out-of-spec for multiple-current-draw uses.
Last edited by garygid on Mon Jan 17, 2011 7:56 am, edited 1 time in total.
See SOC/GID-Meter and CAN-Do Info
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Re: Bad news using my retrofitted EVSE with the LEAF :(

Mon Jan 17, 2011 12:05 am

garygid wrote:You are located in Foster City?
Where is that?
San Francisco Peninsula and according to Google about 414 miles from you :)
What did you have in mind?
Green Honda EV Plus 02/1998-12/2003 plate "ZERO CO2" rip, Aptera 2e #726 canceled
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garygid
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Re: Bad news using my retrofitted EVSE with the LEAF :(

Mon Jan 17, 2011 12:10 am

Coming to help, but ... I added an Edit above.
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Re: Bad news using my retrofitted EVSE with the LEAF :(

Mon Jan 17, 2011 12:12 am

garygid wrote:One could do the same test on somebody's AV (or other 30-amp EVSE) to verify the "different" operation.

However, that does not solve your problem, or make the LEAF work as expected with EVSEs that behave like yours apparently does.
Oh, I see you updated your post. I wonder if the guys over at Boardwalk would let me abuse their EVSE :D

Hopefully the Clipper Creek folks will be able to shed some light on this subject when I try to get a hold of them tomorrow.

Thanks again for all your help Gary.
Green Honda EV Plus 02/1998-12/2003 plate "ZERO CO2" rip, Aptera 2e #726 canceled
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garygid
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Re: Bad news using my retrofitted EVSE with the LEAF :(

Mon Jan 17, 2011 12:24 am

Although it MIGHT be that the LEAF "expects too much" of your EVSE, it actually appears that your EVSE was designed for "single-charge" type of use. However, your EVSE might only need a firmware change.

Also, the old J1772 standard COULD have been different, and your older EVSE MIGHT have been OK for the older standard, but I do not know.

Of course, I could be wrong, and something else entirely might be the problem. Like, the "EV" in our test did not draw any power, so peehaps your EVSE stops the PWM because of that ... or something else again.

However, it really appears that the LEAF is in "spec".

I am willing to discuss/describe the technical issue to somebody who wants to help you.

EDITED: LEAF appears to be in spec, but this particular older EVSE appears to only work for "single-charge" charging sessions.
Last edited by garygid on Mon Jan 17, 2011 8:10 am, edited 1 time in total.
See SOC/GID-Meter and CAN-Do Info
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2011 LEAF, sold in 2015
2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
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garygid
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Re: Bad news using my retrofitted EVSE with the LEAF :(

Mon Jan 17, 2011 12:28 am

Sent you a PM.
See SOC/GID-Meter and CAN-Do Info
2010 Prius, now for sale
2011 LEAF, sold in 2015
2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

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Re: Bad news using my retrofitted EVSE with the LEAF :(

Mon Jan 17, 2011 2:53 am

Gary - remember when I suggested that the pilot signal had changed from 'then' to 'now'? ;) I'm having "Hunt for Red October" flashbacks: "He's just an analyst!" :lol:

No - the Leaf is not out of spec. It's in spec with the J1772-2010 that it was designed around. It's going to take more than a cable to upgrade older EVSE.

EVDRIVER - Thoughts?

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