maini
Posts: 137
Joined: Wed May 14, 2014 2:47 pm
Delivery Date: 25 May 2014
Leaf Number: 339745
Location: NorCal Bay Area

Re: Cheap L2 EVSE by converting the 2013-14 Nissan L1 EVSE - $25

Sun Jul 16, 2017 4:54 pm

Yes the existing J1772 and the cables can do 20A. I think EVSE upgrade might be changing the internals. the circuit inside as you noticed is heavily potted so I doubt anything can be changed. Not sure why EVSE upgrade is not setting theirs at 20A and keeping it at only 16A. Technically speaking 1 resistor in the pilot signal wire might have to be changed to provide 20A but finding that will be good amount of work. I am pretty sure the relays can easily handle 20A.
2014 SV Cayenne Red with LED and QC port

jjeff
Posts: 1700
Joined: Wed Jan 13, 2016 9:10 am
Delivery Date: 13 Jul 2014
Leaf Number: 422121
Location: MSP MN

Re: Cheap L2 EVSE by converting the 2013-14 Nissan L1 EVSE - $25

Sun Jul 16, 2017 6:18 pm

The older Leaf EVSEs can be upgraded to 20a as they have 12 gauge wire, the newer ones cheaped out and went with 14 gauge, hence the 16a max of the newer upgrades. It could be worse, the Volt(and maybe Bolt??) really cheaped out and use 16 gauge, limiting it to 12a max :x
2012 SL purchased used 2/'16
2013 S w/QC purchased new
Juicebox Premium 60a L1/L2 EVSE, Ebusbar 16a L1/L2 EVSE
'12 EVSEupgrade'd 20a L1/L2 EVSE, '13 EVSEupgrade'd adjustable 6-20a L2, 6-13a L1 EVSE
Zencar 13, 20, 30a L1/L2 portable EVSE
GE Durastation 30a

maini
Posts: 137
Joined: Wed May 14, 2014 2:47 pm
Delivery Date: 25 May 2014
Leaf Number: 339745
Location: NorCal Bay Area

Re: Cheap L2 EVSE by converting the 2013-14 Nissan L1 EVSE - $25

Sun Jul 16, 2017 8:37 pm

Very sure my 2014 came with 12AWG wire. So 20Amp should be no problem.
2014 SV Cayenne Red with LED and QC port

jjeff
Posts: 1700
Joined: Wed Jan 13, 2016 9:10 am
Delivery Date: 13 Jul 2014
Leaf Number: 422121
Location: MSP MN

Re: Cheap L2 EVSE by converting the 2013-14 Nissan L1 EVSE - $25

Mon Jul 17, 2017 3:17 pm

maini wrote:Very sure my 2014 came with 12AWG wire. So 20Amp should be no problem.

Yes I believe the '11-14 OEM Leaf EVSEs can be upgraded to 20a by EVup.., I think the 14 gauge wiring started in '15.
At one point the upgrades could be either 16 or 20 amps, order one with a L6-20 end and it would max out at 16a, order one with a L6-30 plug and it would go to 20a max.
Note they all max out at 12a @ 120v unless you purchase a separate 120v adapter, in this case it maxes out at 16a, not 20a like on 240v.
2012 SL purchased used 2/'16
2013 S w/QC purchased new
Juicebox Premium 60a L1/L2 EVSE, Ebusbar 16a L1/L2 EVSE
'12 EVSEupgrade'd 20a L1/L2 EVSE, '13 EVSEupgrade'd adjustable 6-20a L2, 6-13a L1 EVSE
Zencar 13, 20, 30a L1/L2 portable EVSE
GE Durastation 30a

binks
Posts: 18
Joined: Thu Mar 02, 2017 5:12 pm
Delivery Date: 20 Mar 2017
Location: Ottawa Canada

Re: Cheap L2 EVSE by converting the 2013-14 Nissan L1 EVSE - $25

Sun Aug 26, 2018 6:11 pm

I did this mod and it works great

specialgreen
Posts: 126
Joined: Sun Mar 26, 2017 1:21 pm
Delivery Date: 26 Mar 2017
Location: Minnesota

Re: Cheap L2 EVSE by converting the 2013-14 Nissan L1 EVSE - $25

Mon Sep 10, 2018 10:43 am

I did this mod a year ago. 9k miles of charging without issues (maybe 200 charges).

One variation: when I did the mod, I didn't have a resistor to substitute for the temperature sensor. Radio Shack is long-gone, and I didn't want to wait for mail order. So I kept the old 5-15 plug's temperature sensor wires connected to the EVSE. (I removed the other wires, and also trimmed-off the three metal prongs with a Dreml).

I made one other mod: inside the EVSE, I extended the small Control wire (which normally runs from the EVSE to the J1772 connector) to a dual-gang switchbox containing an ordinary lightswitch, and a mechanical timer switch (12-hour Intermatic). The Control wire is connected to both the switch and the timer in parallel. Turning the switch "on" closes the Control connection... as does twisting the timer.

This lets me limit charging to about 80%: at 12A 240v, the EVSE adds about 10% charge per hour to my 30kwhr battery. So if I am parking the car with 40%, and want to stop charging at 80%, I'd twist the timer to 4 hours, then inside the Leaf, hit the timer-override ("clock") button on the dash, and let it charge away. When the timer clicks-off after 4 hours, the Control circuit is interrupted, and charging stops (it's as-if you had walked to your car and pressed the thumbswitch on the J1772). For charging to 100%, I close the on/off switch, and then I let the car's normal charge timer start and end the charge. In practice, I use the on/off switch to charge to 100% all winter, and the 12-hour mechanical timer to charge to 80% most of the summer.

With a dual-gang box connected, it's not very portable. If you wanted it to be portable, I'd put a quick-disconnect between the timer box and the EVSE, and jumper that closed when travelling.

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