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Re: Simple question with complex answers on level 2 charging

Posted: Tue Apr 23, 2019 12:13 pm
by smkettner
Belskinator wrote:I just want the car to charge faster without having to install another plug/breaker.
Thanks!

The existing outlet will only provide so much power.

Example: plug in a hairdryer on high and it works. Plug in 3 and the breaker trips. You just will not ever get 3x out of that connector.
You need to pull wire to get more power.

L1- 120 volts
L2- 208-240 volts
L3- 500+ volts DC

Re: Simple question with complex answers on level 2 charging

Posted: Tue Apr 23, 2019 2:38 pm
by webeleafowners
smkettner wrote:
Belskinator wrote:I just want the car to charge faster without having to install another plug/breaker.
Thanks!

The existing outlet will only provide so much power.

Example: plug in a hairdryer on high and it works. Plug in 3 and the breaker trips. You just will not ever get 3x out of that connector.
You need to pull wire to get more power.

L1- 120 volts
L2- 208-240 volts
L3- 500+ volts DC


If he has a garage or outside circuit that he is willing to give up (including all the receptacles on that circuit except the one he intends to use with the L2 EVSE) he can repurpose a 120 volt 15 amp plug to a 240 volt 15 amp circuit. He can then put a 12 amp 240 volt circuit on that circuit by changing the breaker to double pole 240 volt breaker. No wire pull needed. Recommend using an electrician. He will more than double his charging rate.

Re: Simple question with complex answers on level 2 charging

Posted: Tue Apr 23, 2019 3:41 pm
by smkettner
Not many residences have a random dedicated connection in the garage or outside.
Would need to convert the entire string or pull wire.

Re: Simple question with complex answers on level 2 charging

Posted: Tue Apr 23, 2019 4:19 pm
by webeleafowners
smkettner wrote:Not many residences have a random dedicated connection in the garage or outside.
Would need to convert the entire string or pull wire.


Exactly.

However, at least around here, many residences have a single dedicated soffit plug on a switch for Christmas lights. This has worked for a few folks we know. Still kinda slow, but more than twice as fast as a 120 volt connection.

Re: Simple question with complex answers on level 2 charging

Posted: Tue Apr 23, 2019 4:31 pm
by GRA
webeleafowners wrote:
smkettner wrote:
Belskinator wrote:I just want the car to charge faster without having to install another plug/breaker.
Thanks!

The existing outlet will only provide so much power.

Example: plug in a hairdryer on high and it works. Plug in 3 and the breaker trips. You just will not ever get 3x out of that connector.
You need to pull wire to get more power.

L1- 120 volts
L2- 208-240 volts
L3- 500+ volts DC


If he has a garage or outside circuit that he is willing to give up (including all the receptacles on that circuit except the one he intends to use with the L2 EVSE) he can repurpose a 120 volt 15 amp plug to a 240 volt 15 amp circuit. He can then put a 12 amp 240 volt circuit on that circuit by changing the breaker to double pole 240 volt breaker. No wire pull needed. Recommend using an electrician. He will more than double his charging rate.

Assuming that the wire is Romex or similar. If it's an older (ca. 1940s or before) house he may have knob and tube wiring without a ground, i.e. just two wires. And glass fuses instead of breakers. Bottom line, if the OP wants to get faster charging, they need an electrician, because they've stated they aren't qualified.

Re: Simple question with complex answers on level 2 charging

Posted: Tue Apr 23, 2019 4:40 pm
by LeftieBiker
I wouldn't suggest using knob & tube wiring for an EVSE. It's a pretty safe design (wide separation between the two wires) but it's all so old now that the cloth or natural rubber insulation is falling off of it - or already off. Yes, we should have made it more clear that consultation with an electrician is needed.

Re: Simple question with complex answers on level 2 charging

Posted: Tue Apr 23, 2019 7:00 pm
by alozzy
The OP has left the building...

Re: Simple question with complex answers on level 2 charging

Posted: Wed Apr 24, 2019 10:55 am
by GlennD
The Leaf's charger does not care about voltage it is just about current. It does comply with the J1772 specs. Thus the supplied 12A unit works at 12A.

If you have an EVSE that is dual voltage you can charge up to the max. We have a member here that does just that. I carry a dual voltage OpenEVSE with me. The tables are un-modified so L1 is up to 16A and L2 is 16A. Stock OpenEVSE is J1772 compliant..

I tried both my Leaf SL and my VW golf and both violated the L1 spec.

I forced my OpenEVSE to the L2 settings to try this. THe EVSE only cares about setting the pilot. Open's L1 & L2 displays are purely cosmetic . I have no interest in L1 charging. If I did I would modify the L1 table to allow more current. I charge at 240VAC.

On my list of things to test is my IoniQ.

Re: Simple question with complex answers on level 2 charging

Posted: Wed Apr 24, 2019 11:25 am
by GlennD
Because the Leaf follows the J1772 spec you could safely set the EVSE to 16A on a 20A circuit. Most outlets are only rated at 15A but they have a lot of wiggle room. A 20A outlet is the same but with an extra slot.

Our member uses a 30A circuit like at a truck stop.

Re: Simple question with complex answers on level 2 charging

Posted: Wed Apr 24, 2019 1:23 pm
by LeftieBiker
GlennD wrote:Because the Leaf follows the J1772 spec you could safely set the EVSE to 16A on a 20A circuit. Most outlets are only rated at 15A but they have a lot of wiggle room. A 20A outlet is the same but with an extra slot.

Our member uses a 30A circuit like at a truck stop.


The issue, IIRC, was the Nissan dual voltage EVSE being rated at 30 amps, requiring a 40 amp circuit that is higher amperage than almost all dryer circuits.