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EVDRIVER
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Re: 2018 Leaf EVSE

Mon Sep 18, 2017 9:27 pm

JPWhite wrote:
EVDRIVER wrote:Only special breakers rated for continuous load rated with no de rating can handle 30a, this is also subject to approval by local code. These breakers are not the same as traditional breakers subject to the 25% rule. The design again shows how Nissan and other companies don't get the space and just mirror a plug end with no real thought in the process. Many existing 30 circuits also are quite old and not well suited for this. All this for 3a more which is the most reduculous part.


It could be That Nissan stuck 30Amp on the label to match its conductors, who knows what it actually draws at full wick.


That's what I was thinking.
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Tandemrider
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Re: 2018 Leaf EVSE

Thu Dec 07, 2017 4:56 pm

The 7.6 Kw Solar Edge HD inverter can be wired to provide an EVSE directly from the inverter. In the evening, when there is no solar power, it will charge an EV at 7.6 kw 32 amps from the grid. During the day, if there is enough excess solar energy, it "boosts" the EV charging to 9.6 kw 40 amps. Can the 2018 Nissan Leaf built-in charger accept 40 amps or is it limited to 32 amps or less. Are Teslas the only currently available EV's whose built-in chargers can accept 40 amps?
I know that DC fast chargers supply more power than 40 amps but is that because they have different connectors than the usual 240v SAE J1772 connector?

GlennD
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Re: 2018 Leaf EVSE

Sun Dec 10, 2017 1:32 pm

All EVSE's that I am aware of are limited to 32A or less. Teslas's currently have 50A chargers but the supplied EVSE is 40A. To exceed that would require a redesign of the EVSE. As it is they are pushing the poor Potter and Bloomfield relay.Two two cars with Tesla drive trains ( Toyota and Mercedes) can charge at 40A\ but that is all that I am aware of.

All cars that can charge at 40A can also charge fine from a 30A EVSE. Since Tesla's come with a 40A EVSE 40A EVSE's are specialty items and they are priced accordingly. If you charge overnight then 30A is fine. The most current Leaf's can charge at via L2 is 27.5A
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smkettner
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Re: 2018 Leaf EVSE

Sun Dec 10, 2017 1:38 pm

Clipper Creek and others go to at least 80 amps and need a 100 amp circuit to drive them.
Car will never charge faster on L2 than the on board charger is rated.
The evse and vehicle will communicate to automatically charge at the maximum safe level on any L2 charging station.
1 bar lost at 21,451 miles, 16 months.
2 bar lost at 35,339 miles, 25 months.
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GlennD
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Re: 2018 Leaf EVSE

Sun Dec 10, 2017 1:46 pm

I built my own EVSE and I over built it. Since I only needed a 40A cable for my B250E I put one of Tony's Quick Charge Power cables on it.

If I was using a 30A fixed EVSE like Clipper Creek 30A would have been fine. but since OpenEVSE supports 40A why not. I had the cable on hand. The input is a 50A range cable and I am using a 65A contactor. At 30A everything was loafing. At 40A I still have a reserve.
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
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Re: 2018 Leaf EVSE

Sun Dec 10, 2017 1:57 pm

by the way, 80A is the max of the J1772 spec. At 80% it would require a 100A circuit. Most cars do not come close to that. The only exception that I can think of is a dual charger Tesla.

The car sets the current as long as their is enough. An 80A EVSE would work for most cars but most of the available current would be ignored. It would be a giant waste of money.
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

GerryAZ
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Re: 2018 Leaf EVSE

Sat Dec 16, 2017 6:16 am

The 6 kW onboard charger in my 2015 will draw 30 amperes continuous from a 208-volt circuit if the EVSE allows and the battery SOC is low enough. The owner manual lists maximum current as 32 amperes so it should go higher than 30 if the voltage is low enough. The voltage is normally about 212 at my workshop/garage so the car draws 30.0 amperes. The voltage is normally about 245 at home so the car draws about 26.4 amperes (a little less when voltage is higher and a little more on the rare occasions when the voltage is lower).
Gerry
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DaveinOlyWA
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Re: 2018 Leaf EVSE

Sat Dec 16, 2017 9:27 am

LeftieBiker wrote:That 30A 240 volt rating may cause problems with old 30 amp dryer circuits. They won't trip, just possibly overheat...


There is no claimed increase in L2 speed but then again, might simply be news that was pushed off the table by Pro Pilot
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MikeD
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Re: 2018 Leaf EVSE

Sun Dec 17, 2017 3:00 pm

Since the 2013 MY, the portable EVSE supplied with the Leaf apparently has in its 15a plug a temperature sensor mechanism to help guard against fires caused by excessive overheating occurring in the vicinity of that plug. I say this because beginning in 2013 (and thru 2017) this EVSE has an additional 7th itemized fault condition mentioned in the Owner's Manual with the following description: "When the temperature of the electrical plug is too hot, or the EVSE is unable to detect the temperature of the electrical plug, check that the electrical plug is connected correctly.".

It makes sense that the new 120v/240v portable EVSE has AT LEAST this degree of safety built into the 240v plug and perhaps also duplicated in some way in the 120v adapter -- which probably accounts for their larger than normal size. This is reasonably at least part of why Nissan recommends AGAINST using either an extension cord or another adapter, as either would eliminate or partially eliminate this built-in safety feature.

I checked today, but could not yet find a 2018 Owner's Manual via usual online URLs: "https://owners.nissanusa.com/content/techpub/ManualsAndGuides/LEAF/20xx/20xx-LEAF-owner-manual.pdf".

MikeD
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Re: 2018 Leaf EVSE

Sun Dec 17, 2017 9:45 pm

Looking at Nissan's online 2018 Leaf documentation, it looks like the portable dual voltage EVSE only comes standard with the SL Leaf trim. To get it with the S trim it appears necessary to get the Charge Package, and to get it with the SV trim it appears necessary to get the Technology Package. I saw no mention of any other portable EVSE (say Level 1 -- 120v only) from Nissan as an option for the 2018 Leaf.

Although it would be nice to have the portable EVSE standard on all Leafs, this would result in higher prices for basic S and SV Leafs -- EVSEs ain't free. The reality is that there are a lot of choices now for portable EVSEs for people that desire even more flexibility -- and many people (like myself) don't need a portable in the first place.

In any case, Nissan now for the first time is providing what looks like a very versatile EVSE: it can be used on a regular basis as your only EVSE to charge your Leaf at top Level 2 speed at most peoples homes (with proper 14-50 outlet installation) and on the road at many RV parks, or at Level 1 speed probably 80% or 90% of locations in a pinch.

A quick comment on proper 14-50 outlet installation for non-exceptional ones:
I believe the current NEC still allows this outlet to be wired for either 40 or 50 amps (usually means using 8-3 AWG for the former or 6-3 AWG cable for the latter). If you are installing new cable, the only somewhat more expensive (thicker) 6 AWG is probably the wisest/safest choice. I would also recommend using a 40a breaker if you use 8-3 AWG cable and using a 50a breaker if you use 6-3 AWG cable, as this way you can look at the DOCUMENTED(?!) EVSE breaker to more easily tell what amperage your outlet is capable of.

If I have seriously erred in the previous paragraph, please let me know so I can correct its text...

One last but important concept:
Keep in mind that the NEC rules concerning amps, wire thickness, etc are mostly there to try to properly protect a wire's or cable's INSULATION from damage due to heat, both short term and in the long run. You don't want excessive heat to cause the insulation to become hard and brittle (or even melting/burning!) and therefore unsafe due to possibly allowing arcing (fires) or short circuits or shock hazards.

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