Kenny
Posts: 1
Joined: Tue Oct 15, 2019 4:11 am
Delivery Date: 28 Aug 2018

Adjustable EVSE

Thu Oct 01, 2020 1:44 pm

Can anyone recommend a good adjustable EVSE for my 2018 Leaf? I would like the ability to toggle between 6.6kW, 3.3kW & 1.4kW charging. I plug in to a NEMA 14-50 receptacle. Also, are there any EVSE out there that can stop the charge at a preset % of my choosing?

rmay635703
Posts: 559
Joined: Wed Jan 19, 2011 7:43 pm

Re: Adjustable EVSE

Thu Oct 01, 2020 3:20 pm

Duosida

goldbrick
Posts: 966
Joined: Tue Aug 01, 2017 3:33 pm
Delivery Date: 01 Aug 2017
Leaf Number: 311806
Location: Boulder, CO

Re: Adjustable EVSE

Thu Oct 01, 2020 4:22 pm

I don't know of any EVSE that will stop at a fixed % SOC but OpenEVSE allows you set the charging current and start/stop times which is close enough for me. I think I remember Dala (the great) that was working on or considering a muxsan bridge-enabled way to do this but I don't know if that ever made it to production. And that wouldn't be a full EVSE IIRC.

cwerdna
Posts: 11171
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: Adjustable EVSE

Thu Oct 01, 2020 4:29 pm

JuiceBox also will supposedly let you specify stopping % SoC but it has to make an educated guess based upon user input + numerous other parameters it should know about already.

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goldbrick
Posts: 966
Joined: Tue Aug 01, 2017 3:33 pm
Delivery Date: 01 Aug 2017
Leaf Number: 311806
Location: Boulder, CO

Re: Adjustable EVSE

Fri Oct 02, 2020 11:09 am

I think the basic problem is that any L2 EVSE only supplies 240V AC power (or 208V, in the US at least). This is converted to DC by the car's charger. The SOC is based on the DC voltage of the traction battery so an external L2 EVSE can't monitor that.

You can do the math yourself (my plan with OpenEVSE), you can have the EVSE do the math given some input parameters (as above) or something like LeafSpy might be able to monitor the DC voltage and then report that back to the EVSE. That last bit is the tough part IMHO. Maybe the CANBUS could signal the charger to to send some sort of message to the j1772 plug to terminate the charging or WIFI or bluetooth could be used to transmit to the EVSE to terminate. Either way, it's not a simple problem.

1byte
Posts: 11
Joined: Mon Oct 05, 2020 12:10 pm
Delivery Date: 01 Aug 2020
Leaf Number: 301105

Re: Adjustable EVSE

Mon Oct 05, 2020 12:24 pm

I picked up the Duosida 32amp adjustable EVSE from an Ebay seller a month ago for right at $200 (free shipping). It's been great.
https://duosidaevchargers.com/

I have fully tested it and it works with the following:
240 volt AC
208 volt AC (this is what my work has)
120 volt AC

It works with all the above voltages with any of the adjustable amps; 10,13, 16, & 32 amps. Leaf's max is 27.5 amp on 240 volt.

I just made two adaptors which covers anything I'll run into. 14-50R to TT-30P (Travel Trailer 120v 30amp) & TT-30R to 5-15P (standard 120v 15amp US house outlet).


-Sean
2017 Leaf - 11bars - 40,000 miles
Central Texas - SOH=77% - Hx=50% - 61.9 AHr
427QC - 647 L1/L2

LeftieBiker
Moderator
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Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: Adjustable EVSE

Mon Oct 05, 2020 1:27 pm

You shouldn't use 13 amps for a 120 volt, 15 amp circuit, so that leaves choosing between 10 and possible hot wiring. It also doesn't offer the optimum amperage for charging a Leaf, or even anything close to it...
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jjeff
Posts: 2153
Joined: Wed Jan 13, 2016 9:10 am
Delivery Date: 13 Jul 2014
Leaf Number: 422121
Location: MSP MN

Re: Adjustable EVSE

Mon Oct 05, 2020 2:56 pm

LeftieBiker wrote:
Mon Oct 05, 2020 1:27 pm
You shouldn't use 13 amps for a 120 volt, 15 amp circuit, so that leaves choosing between 10 and possible hot wiring. It also doesn't offer the optimum amperage for charging a Leaf, or even anything close to it...
Somewhat agree although the 13a setting is probably closer to 12a, they always seem to be a bit low. The 16a setting would be good for a 20a circuit but what I'd miss would be a 24a setting for a 30a circuit. 27.5a for a TT-30 outlet the OP mentioned is just too much current! Note the EVSE isn't the one limiting it to 27.5a in the case of the Leaf but rather the Leaf itself which maxes out at 27.5a, hooking this EVSE up to another car that could draw more on 120v would really be a bad idea for a TT-30 outlet!
Personally I'd like to see:
12a, 16a, 20a, 24a and maybe 30 or 32a max. The 20a being somewhat sketchy but I've found out at least with my EVSEs is a 20a setting results in about a 19a draw, too much for continuous use on a 20a circuit but OK if you know the circuit is dedicated and in good quality for short periods of time to get the maximum charge you could. I used to regularly charge at that current at a building I went to, I monitored the plug and breaker temps the first few times I did this and everything seemed OK, again it was for occasional short term(less than a couple hours) charging when I wanted the maximum Kw I could get from a 20a circuit, again on a dedicated circuit and quality wiring/outlets.
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
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alozzy
Posts: 1605
Joined: Fri Jan 20, 2017 4:25 pm
Delivery Date: 18 Jan 2017
Location: Vancouver, BC
Contact: Website

Re: Adjustable EVSE

Mon Oct 05, 2020 4:33 pm

I know it's not to code, but in retrospect I should have ordered my Zencar EVSE with a 26A setting, rather than the 24A setting, for my 30A circuit.

At 24A, the cable never even gets warm. Also, the 14-30R is right beside the panel, so it's a super short run. I realize 26A exceeds 80% of 30A, but I seldom if ever charge for more than 3 hours continuously, usually for less than 90 minutes.

24A is safer though and provides 87% of the full charging rate, whereas 26A would provide 95% of the full charge rate.

As jjeff mentioned, the actual draw, shown on the Zencar's display, is always a bit under the set point which adds a margin of safety
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
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Oilpan4
Posts: 1731
Joined: Wed Jan 09, 2019 10:51 pm
Delivery Date: 10 May 2018
Leaf Number: 004270

Re: Adjustable EVSE

Mon Oct 05, 2020 7:08 pm

Hey that 10 amp setting sounds good. I could set my leaf to simmer all night on these long cold winter nights and be hitting 80 to 90% maybe 100% when I wake up to go to work.
Instead of hitting max charge 2 or 3 hours before I wake up.

If the entire length of the wire is exposed r in a metal conduit with lota of room don't worry about it. The wire amp capacity charts are made using worst case scenario, such as a wire sealed up in a wall buried in fiberglass insulation on a hot summer day.

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