Jerryr
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Re: Specs for 240v outlet/breaker

Tue Jun 25, 2019 6:09 am

RustyShackleford wrote:
Jerryr wrote:By code you will need at least 40 amps to power the 2018-2019 Nissan 120/240v. EVSE.

So there's no such thing as a charging cable that would only pull 24 amps (and so be ok w/ 30amp circuit) ?


Clipper Creek makes a 30 amp 240v connectable EVSE Model LCS-30 that connects to a 30 amp Supply and pulls max 24 amps. It will provide a decent rate L2 charge at about 5.8 kw.

There is no such thing as a 40 amp only receptacle. For 40 amp 240v the receptacle used is a 14-50R the same for 50 amp 240v.
Oh I see, so the '50' (in 14-50R) means it can handle 50amps but not that it's illegal to hook it to a small circuit (or at least to a 40amp).


Yes. Most electric ranges require 40 amp 240v supply and come with a cord with a 14-50P plug that plugs into a 14-50R receptacle protected by a 40 amp breaker. Here’s an example of a 40 amp rated range power cord with that plugs into a 14-50R receptacle. https://www.homedepot.com/p/EZ-FLO-6-ft ... /301074807
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smkettner
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Re: Specs for 240v outlet/breaker

Tue Jun 25, 2019 8:22 am

RustyShackleford wrote:So there's no such thing as a charging cable that would only pull 24 amps (and so be ok w/ 30amp circuit) ?


https://store.clippercreek.com/index.php?route=product/search&search=LCS-30

Unfortunately I don't see plug for the common 10-30. If you have a 10-30 connector you could hardwire or change the connector. There are other evse available too.

I installed the hardwire version in a rental house and it works great.
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RustyShackleford
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Re: Specs for 240v outlet/breaker

Tue Jun 25, 2019 10:46 am

Jerryr wrote:
RustyShackleford wrote:So there's no such thing as a charging cable that would only pull 24 amps (and so be ok w/ 30amp circuit) ?


Clipper Creek makes a 30 amp 240v connectable EVSE Model LCS-30 that connects to a 30 amp Supply and pulls max 24 amps. It will provide a decent rate L2 charge at about 5.8 kw.

Thanks for these pointers (you and @mkettner). They are several hundred dollars. The only reason to try to go to a smaller amperage cable would be to be able to use with a 30amp receptacle at her son's house, the idea being it's easier to find one of those. But I think she's better off sticking with the 3XB3 that'll come with the car (i.e. free), and put that money into another 40amp outlet at her son's house if need be (he or I can install it).

I am curious though: if I bought that 30amp cord, how does the car know to pull less juice ? I'm thinking the other conductors in the connector allow the car to handshake with some kind of logic in the box in the cord, and tell it "you're actually connected to a car and not some kid's fingers" while the cord tells the car "you can only draw 24 amps from this charger (dunno why it insists on making this a hyperlink)"; do I have that about right ?

Yes. Most electric ranges require 40 amp 240v supply and come with a cord with a 14-50P plug that plugs into a 14-50R receptacle protected by a 40 amp breaker.

Duh, I actually installed one of those when we remodeled kitchen 3 years ago (with 40amp breaker and 8/3 NM-B).

goldbrick
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Re: Specs for 240v outlet/breaker

Tue Jun 25, 2019 10:56 am

RustyShackleford wrote:how does the car know to pull less juice ? I'm thinking the other conductors in the connector allow the car to handshake with some kind of logic in the box in the cord, and tell it "you're actually connected to a car and not some kid's fingers" while the cord tells the car "you can only draw 24 amps from this charger"; do I have that about right


Yeah, that's about right, except technically, the charger is in the car and the EVSE is the 'box in the cord' plus the associated other parts (cord, plug, etc). You can find all the details if you're interested in the J1772 spec which should be freely available on the web.

RustyShackleford
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Re: Specs for 240v outlet/breaker

Tue Jun 25, 2019 11:05 am

Now we have to decide whether to spring for a hard-wired charging station, or just install a 14-50R outlet on the side of the house near where wife parks (in some sort of weather-proof housing I guess) and use the 3XB3 cord that's with the car. I guess it's cost of the hard-wired unit versus the inconvenience of she either has to leave the cord plugged in and thus not have it while she's on the road, or have to pull it out and plug it in every time she comes home.

Have to decide REAL soon too, she'll get the car Thursday ...

Oddly (especially considering our earlier discussion) it looks like the hard-wired unit that Nissan points you to:

https://www.amazon.com/dp/B07FWSGK1C/re ... 94011&th=1

... is only 32 amps, so wondering if it'll charge the car as fast as the 3XB3 in a 40- or 50-amp outlet ?

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davewill
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Re: Specs for 240v outlet/breaker

Tue Jun 25, 2019 11:30 am

RustyShackleford wrote:Now we have to decide whether to spring for a hard-wired charging station, or just install a 14-50R outlet on the side of the house near where wife parks (in some sort of weather-proof housing I guess) and use the 3XB3 cord that's with the car. I guess it's cost of the hard-wired unit versus the inconvenience of she either has to leave the cord plugged in and thus not have it while she's on the road, or have to pull it out and plug it in every time she comes home.

Have to decide REAL soon too, she'll get the car Thursday ...

Oddly (especially considering our earlier discussion) it looks like the hard-wired unit that Nissan points you to:

https://www.amazon.com/dp/B07FWSGK1C/re ... 94011&th=1

... is only 32 amps, so wondering if it'll charge the car as fast as the 3XB3 in a 40- or 50-amp outlet ?

There's normally little purpose to carrying the cord around on a daily basis. I can count the number of times I've used a portable EVSE during my 8 years of EV ownership on my fingers, and not once was it unforeseen. It's sufficient to leave it plugged in at home, and take it with you only when you are leaving on a long trip or have some other reason to think you might need it.

The JuiceBox you linked to will certainly charge the car at it's full rate. With it being the same price, you might as well buy the 40a unit...it won't charge the LEAF any faster, but if you get some other car later than can charge at 40a, you'll be ready. :)
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smkettner
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Re: Specs for 240v outlet/breaker

Tue Jun 25, 2019 11:59 am

RustyShackleford wrote:I am curious though: if I bought that 30amp cord, how does the car know to pull less juice ?
All evse send a pilot signal (tone) to the vehicle in order to communicate the maximum amps. Range is about 6 to 80 amps.
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GlennD
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Re: Specs for 240v outlet/breaker

Tue Jun 25, 2019 12:43 pm

The EVSE signals the current available via the pilot. If there is an amount equal or greater than the car needs the car;s charger sets the current. Any excess is ignored.

My EVSE is a 40A unit connected to a 50A circuit that charged my "B" at 49A. The same EVSE charges my IoniQ at 28.5A. The car takes what it needs and it ignores the excess..
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RustyShackleford
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Re: Specs for 240v outlet/breaker

Tue Jun 25, 2019 2:47 pm

Thanks for all the replies. Wife has deemed that she'll never leave the charging cable at home; we live in a relatively rural area, not super EV friendly. And it's a pain, and possibly dangerous if I don't use a GFCI breaker (which I really don't want to do*) for her to be pulling the cord out of the car and plugging in both ends, every time she comes home. Plus she'll be spending lots of time at new grandkid's house and that's 50+ miles away.

So I'll be putting in a hard-wired unit. Clipper Creek seems to be mentioned a lot here, should I consider others ? The HCS-50 or HCS-40, able to supply 40 and 32 amps, respectively ? I understand the HCS-40 can supply all the juice the Leaf can take, but maybe something else down the road ?

Do I understand correctly that the Leaf (specifically a 2018 SV) allows you to schedule a charge ? If not, I want to find a charging station that handles that, because we have super-off-peak in the middle of the night, plus it's been recommended (in another thread) to avoid charging the battery when it's hot.

* Load center is pretty full, and I don't think there are "space saver" versions of GFCI outlets.

LeftieBiker
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Re: Specs for 240v outlet/breaker

Tue Jun 25, 2019 3:09 pm

Do I understand correctly that the Leaf (specifically a 2018 SV) allows you to schedule a charge ? I


Yes. It has two charge timers and a 'charge on timer only at home' option.
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