Page 1 of 1

Making a conversion J1772 / IEC 62196 capable

Posted: Thu, 14 Jun 2018, 11:57
by jonescg
Hi Everyone,

Conversions are still happening, and for as long as we're allowed to, we will continue to build them. But being able to use a public charger would be lovely. I'd really like this post to be a go-to source for wiring diagrams and circuits for making sure your conversion is able to plug into a Type-2 public charge point and being smart enough to turn the charging power down by itself so it doesn't trip the breakers. This may mean carrying a special EVSE with you in the car, but in any case, how do you make the car compliant?

This is the standard Type-2 connection system:
Type_2_M&F_Pinout_wiki.JPG
Type_2_M&F_Pinout_wiki.JPG (26.42 KiB) Viewed 2259 times

Where the female plug on the left is the public charger, and the male socket on the right is what's on the side of your converted car.

This image pops up in searches indicating what is needed on the vehicle side, however it doesn't have what is required to turn the power of the on-board charger down.
J1772-1.jpg
J1772-1.jpg (48.25 KiB) Viewed 2259 times

Are these values consistent with the needs of a 7 kW onboard charger? How about a 3-phase, 22 kW charger setup? I know the TC chargers are able to be dialled down using resistors on the Enable pin, and they can be modified using CAN. What's the best solution here?

Re: Making a conversion J1772 / IEC 62196 capable

Posted: Thu, 14 Jun 2018, 12:57
by reecho
You could use a resistor across a multi turn switch and command the charger that way to reduce current, but the risk there is that if a 10A EVSE is plugged in and the switch was set to 32A you will have one roasted EVSE in a matter of minutes.

There is something like this from Thunderstruck EV, which will command reduced current from the charger via CAN... http://www.thunderstruck-ev.com/evcc-ch ... oller.html

The best solution is to convince the supplier of your BMS to include it in his product... :-)

Re: Making a conversion J1772 / IEC 62196 capable

Posted: Thu, 14 Jun 2018, 13:21
by jonescg
reecho wrote:
Thu, 14 Jun 2018, 12:57

The best solution is to convince the supplier of your BMS to include it in his product... :-)
Paging @zeva :D

Re: Making a conversion J1772 / IEC 62196 capable

Posted: Fri, 15 Jun 2018, 07:33
by coulomb
Or this sort of thing, which is more DIY:

Image

http://www.evwest.com/catalog/product_i ... cts_id=107

Re: Making a conversion J1772 / IEC 62196 capable

Posted: Fri, 15 Jun 2018, 09:51
by jonescg
That's what I had in mind - thanks Mike. I assume all this does is allows the charge point contactor to close and commence charging, but has no means to change the power output of the charger? Which is an acceptable compromise IMO.

Re: Making a conversion J1772 / IEC 62196 capable

Posted: Fri, 15 Jun 2018, 11:01
by reecho
coulomb wrote:
Fri, 15 Jun 2018, 07:33
Or this sort of thing, which is more DIY:

Image

http://www.evwest.com/catalog/product_i ... cts_id=107
That device will allow basic comms with J1772 compliant stations, but it has no means for PWM charge rate control. You can get away with a 882 ohm resistor and a 1N4148 diode if you wan to fool chargers.

Re: Making a conversion J1772 / IEC 62196 capable

Posted: Fri, 15 Jun 2018, 12:22
by jonescg
Would that work with the Type-2 connector as well? Given that it doesn't have a switch on the handset?

Re: Making a conversion J1772 / IEC 62196 capable

Posted: Fri, 15 Jun 2018, 16:51
by Jeff Owen
reecho wrote:
Fri, 15 Jun 2018, 11:01
You can get away with a 882 ohm resistor and a 1N4148 diode if you wan to fool chargers.
You can fool some of the EVSEs with an equivalent resistor, but you need both resistors and a switch to fool the rest of them. They are also required for conversions to use Tesla EVSEs.

Re: Making a conversion J1772 / IEC 62196 capable

Posted: Mon, 18 Jun 2018, 05:02
by Bryce
Orion BMS has J1772 comms option.
Cheers
Bryce

Re: Making a conversion J1772 / IEC 62196 capable

Posted: Mon, 18 Jun 2018, 15:26
by reecho
jonescg wrote:
Fri, 15 Jun 2018, 12:22
Would that work with the Type-2 connector as well? Given that it doesn't have a switch on the handset?
Indeedly doo...

Re: Making a conversion J1772 / IEC 62196 capable

Posted: Mon, 09 Sep 2019, 13:10
by jonescg
Reviving an old thread there, but I just tried plugging the Prelude into an EO Type-2 charge point in Fremantle and nothing happened. I wonder if the AVC2 is a bit too simple for the average charge point?

It will only take about 25 A from the AC side, so any 32 A capable charger should be fine. But rather annoying I couldn't get a top-up. I have a feeling I might be driving home very carefully.

Re: Making a conversion J1772 / IEC 62196 capable

Posted: Mon, 09 Sep 2019, 15:17
by coulomb
jonescg wrote:
Mon, 09 Sep 2019, 13:10
I wonder if the AVC2 is a bit too simple for the average charge point?
Surely the whole idea is to be completely compatible.

Maybe it's timing of one of the resistor changes, so the AVC2 should work with most EVSEs that aren't too picky. Jeff Owen has posted about some EVSEs needing proper timing, and he has achieved that with a separate button (I forget the details, but it might be worth a search). [ Edit: in fact, he mentions it 4 posts back :D I think the details are in another post of his. ]

I assume that the AVC2 has the "J1772" diode on the pilot signal. Some Leafs are prone to blowing that diode; if it fails short circuit, they can still charge via some EVSEs but not others. It should be easy enough to test for the diode; it should literally be the first component connected to the pilot signal.

Re: Making a conversion J1772 / IEC 62196 capable

Posted: Mon, 09 Sep 2019, 15:25
by jonescg
It's interesting because Richard's OpenEVSE unit works a treat. That said, even with the power turned off at the wall, plugging the T2 conenctor into the car fires everything up, so it's not actually looking for any fancy signals, just some passives in the PE->PE circuit.

I'm going to try the charger at Renault Melville on my way home. I have a feeling I might be running low on juice by the time I get to the base of the hill, and there's at least a full kWh worth of gravitational potential energy to find.

Re: Making a conversion J1772 / IEC 62196 capable

Posted: Tue, 10 Sep 2019, 10:15
by jonescg
Well I can confirm that the EO charge point won't work, the Schneider charge point works for a minute, then drops out and needs to be reset, and Tesla destination chargers don't work.
It seems the AVC2 is too simple a trick for these smarter charge points...