alozzy
Posts: 677
Joined: Fri Jan 20, 2017 4:25 pm
Delivery Date: 18 Jan 2017
Location: Vancouver, BC
Contact: Website

Re: Khons 32a portable L2 EVSE

Tue May 02, 2017 8:50 pm

Pretty sure the source for that "these are cheap EVSE units..." quote is these guys:

https://www.evdriver.co.uk

They appear to use ChargePoint EVSEs exclusively...
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
Zencar 12/20/24/30A L1/L2 portable EVSE
1-1/4" Curt #11396 hitch
After market, DIY LED DRLs
LeafSpy Pro + Konnwei KW902 ELM327 BT OBDII dongle
Loving my first BEV :D

jjeff
Posts: 1466
Joined: Wed Jan 13, 2016 9:10 am
Delivery Date: 13 Jul 2014
Leaf Number: 422121
Location: MSP MN

Re: Khons 32a portable L2 EVSE

Wed May 03, 2017 6:14 am

irv wrote:
These are cheap EVSE units with Doestar handles. They have compliance issues, design flaws, and are made by companies with little understanding of standards, safety and reliability and sold under many names to people in the us to resell them and make a quick buck.


Hi, is there real basis for the claim about the "compliance issues and design flaws" for these cheap EVSEs? I know that these do not have UL certification, but at the same time I've seen people using them successfully. I just want to know if the claims are based on facts or if those are just general sentiments since there are no guarantees for these products. Thanks.

I've used my "cheap EVSE" hundreds of times, use it several times/day and it's never given me problems. I believe the issue with the white Duostar handle was an old issue, long since fixed. My J1772 mates to my Leafs just fine, not too much pressure, not too little, just perfect IMO.
The company they are made by is a large factory in China churning out lots of EVSEs for markets all over the world, they aren't made by some backyard mechanic, although I'm not against that if they are made correctly.
It's your call, many people don't want to take what they consider a risk and instead purchase something like a Clipper Creek or other major US mfgs. and thats OK too, I took the small risk and couldn't be happier :)
I agree, wiring the 14-50 plug wrong in that report was somewhat unforgivable, all I can say is modding to our N. American plug is probably done after the initial assembly, the unit itself should be somewhat assembly line produced, my Zencar EVSE had the L6-30 plug I wanted and was wired correctly.
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

magico13
Posts: 61
Joined: Thu Dec 22, 2016 12:39 pm
Location: Cleveland, OH

Re: Khons 32a portable L2 EVSE

Wed May 03, 2017 7:39 am

I've got one of these that I ordered from EVSEadapters.com with a "universal" 14-30/14-50/14-60 plug (basically they just remove the neutral since it isn't used for charging anyway). I've been using it since February nearly every day without issue. I also got a 14-50 to 10-30 adapter for older dryer plugs and setting the unit to 24 amps worked fine when I used it with a 10-30 before getting my 14-50 installed in the garage. I'd like to get a nicer EVSE (with wifi so I can stop charging remotely) at some point and just use this one when travelling, but it's worked great so far without issue for the past three months. For the EVSE and the adapter I think it was about $430 total.
2015 SV w/ QC

GlennD
Forum Supporter
Posts: 1180
Joined: Sun Dec 18, 2011 7:14 pm
Delivery Date: 20 Jul 2013
Leaf Number: 410357
Location: Anaheim

Re: Khons 32a portable L2 EVSE

Sun May 07, 2017 6:40 pm

Most cheap Chinese EVSE's work fine but many (most ?) lack the GFCI coil. That means that they work well but if there is a grounding failure then you are on your own. The J1772 standard is optional and many Chinese EVSE's do not fully comply.
2012 Cayenne Red SL traded for:
2013 Pearl White SL Premium
Traded for a Cirrus White 2014 Mercedes B (totaled)
2016 Urano Gray eGolf SEL w/ drive assist
Loved the VW but it sat too low for my old body
Back to a Cirrus White 2017 B250E

jjeff
Posts: 1466
Joined: Wed Jan 13, 2016 9:10 am
Delivery Date: 13 Jul 2014
Leaf Number: 422121
Location: MSP MN

Re: Khons 32a portable L2 EVSE

Mon May 08, 2017 6:43 am

GlennD wrote:Most cheap Chinese EVSE's work fine but many (most ?) lack the GFCI coil. That means that they work well but if there is a grounding failure then you are on your own. The J1772 standard is optional and many Chinese EVSE's do not fully comply.

True but when I asked Zencar, the mfg. of this Khons or at least a very close clone, they said they could add GFCI(possibly for an extra fee??) but most customers(probably with sketchy power sources in Asian countries) didn't want GFCI as they got frequent nuisance trips :)
From my use of GFI outlets I kind of concur, mine are frequently tripping by such little things as switching a light switch, unplugging another device on the same line, etc. As charging my EV can be critical if I need to get somewhere I'd just as soon eliminate one source of this not happening. I realize GFCI can help with safety but I'm personally willing to forgo a little safety and possibly gain a little more reliability that my car will actually be charged when I want it to be :)
Of course if you have a hardwired setup and dedicated circuit, nuisance tripping may not really happen but I like to charge out and about and don't always know what else is on the line.
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

GlennD
Forum Supporter
Posts: 1180
Joined: Sun Dec 18, 2011 7:14 pm
Delivery Date: 20 Jul 2013
Leaf Number: 410357
Location: Anaheim

Re: Khons 32a portable L2 EVSE

Tue May 09, 2017 1:00 pm

jjeff wrote:
GlennD wrote:Most cheap Chinese EVSE's work fine but many (most ?) lack the GFCI coil. That means that they work well but if there is a grounding failure then you are on your own. The J1772 standard is optional and many Chinese EVSE's do not fully comply.

True but when I asked Zencar, the mfg. of this Khons or at least a very close clone, they said they could add GFCI(possibly for an extra fee??) but most customers(probably with sketchy power sources in Asian countries) didn't want GFCI as they got frequent nuisance trips :)
From my use of GFI outlets I kind of concur, mine are frequently tripping by such little things as switching a light switch, unplugging another device on the same line, etc. As charging my EV can be critical if I need to get somewhere I'd just as soon eliminate one source of this not happening. I realize GFCI can help with safety but I'm personally willing to forgo a little safety and possibly gain a little more reliability that my car will actually be charged when I want it to be :)
Of course if you have a hardwired setup and dedicated circuit, nuisance tripping may not really happen but I like to charge out and about and don't always know what else is on the line.[/quote

GFCI is really hard to implement. I have an OpenEVSE that is driving me nuts. To sense a current imbalance requires a very sensitive input amplifier and it can readily see glitches. I am tempted to take the Chinese approach and just eliminate the GFCI circuit entirely but no, it has worked on other units.
2012 Cayenne Red SL traded for:
2013 Pearl White SL Premium
Traded for a Cirrus White 2014 Mercedes B (totaled)
2016 Urano Gray eGolf SEL w/ drive assist
Loved the VW but it sat too low for my old body
Back to a Cirrus White 2017 B250E

GlennD
Forum Supporter
Posts: 1180
Joined: Sun Dec 18, 2011 7:14 pm
Delivery Date: 20 Jul 2013
Leaf Number: 410357
Location: Anaheim

Re: Khons 32a portable L2 EVSE

Wed May 31, 2017 7:15 pm

GlennD wrote:
jjeff wrote:
GlennD wrote:Most cheap Chinese EVSE's work fine but many (most ?) lack the GFCI coil. That means that they work well but if there is a grounding failure then you are on your own. The J1772 standard is optional and many Chinese EVSE's do not fully comply.

True but when I asked Zencar, the mfg. of this Khons or at least a very close clone, they said they could add GFCI(possibly for an extra fee??) but most customers(probably with sketchy power sources in Asian countries) didn't want GFCI as they got frequent nuisance trips :)
From my use of GFI outlets I kind of concur, mine are frequently tripping by such little things as switching a light switch, unplugging another device on the same line, etc. As charging my EV can be critical if I need to get somewhere I'd just as soon eliminate one source of this not happening. I realize GFCI can help with safety but I'm personally willing to forgo a little safety and possibly gain a little more reliability that my car will actually be charged when I want it to be :)
Of course if you have a hardwired setup and dedicated circuit, nuisance tripping may not really happen but I like to charge out and about and don't always know what else is on the line.[/quote

GFCI is really hard to implement. I have an OpenEVSE that is driving me nuts. To sense a current imbalance requires a very sensitive input amplifier and it can readily see glitches. I am tempted to take the Chinese approach and just eliminate the GFCI circuit entirely but no, it has worked on other units.[Well, I finally found my problem. The EVSE was mounted next to the relay. I replaced it with a contactor and the GFCI problem was consistent. It is much easier th troubleshoot a reproducible problem. It even occurred with the GFCI opamp removed. I finally determined it was magnetic interference from the relay coil. Moving the board totally fixed the problem. With the original relay I never would have found the problem. With the contactor it was always there and easier to troubleshoot. There is no shielding on the OpenEVSE board and the supple problem was hard to find.

Remember the field drops with the square of the distance so moving the board a small distance makes a lot of difference. Every once in a while A problem will drive you to drink! The problem said GFCI but it was not.
2012 Cayenne Red SL traded for:
2013 Pearl White SL Premium
Traded for a Cirrus White 2014 Mercedes B (totaled)
2016 Urano Gray eGolf SEL w/ drive assist
Loved the VW but it sat too low for my old body
Back to a Cirrus White 2017 B250E

jeffroper
Posts: 1
Joined: Wed Jun 28, 2017 3:20 pm
Delivery Date: 01 Jun 2017

Re: Khons 32a portable L2 EVSE

Wed Jun 28, 2017 3:27 pm

Does anyone know what the parasitic draw is for the KHONS L2 EVSE? It says 0.23kW on the display when not plugged into the car which is 230 watts. That equates to $750 per year at my top tier power rate. The reseller, EVSE Adaptors says it draws less than a watt at rest, but that's not what the display says. Maybe I need to ask my electrician to measure the draw accurately.

jjeff
Posts: 1466
Joined: Wed Jan 13, 2016 9:10 am
Delivery Date: 13 Jul 2014
Leaf Number: 422121
Location: MSP MN

Re: Khons 32a portable L2 EVSE

Wed Jun 28, 2017 4:25 pm

While I don't have a KHONS, I do have a very similar Zencar EVSE and I believe the draw was just a tad over 2 watts when not charging. If I had to venture a guess I'd bet the KHONS was drawing 2.3 watts, not .23Kw.
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

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