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evnow
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Re: Q: 120V emergency cord

Thu Jun 24, 2010 7:40 am

The limitation is 120V , 15 Amps. You can't put to of them in parallel - since the car has only one input. Though it is an interesting idea - if the car had two inputs - you could potentially use 2 120V inputs from two separate circuits and reduce charging time.
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LTLFTcomposite
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Re: Q: 120V emergency cord

Thu Jun 24, 2010 7:48 am

evnow wrote:The limitation is 120V , 15 Amps. You can't put to of them in parallel - since the car has only one input. Though it is an interesting idea - if the car had two inputs - you could potentially use 2 120V inputs from two separate circuits and reduce charging time.
If you could find two receptacles on opposite phases you could rig up a 15amp (or maybe 20) 220v evse. Pretty rube goldberg though.
LTL
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[35 months] [35K miles] [9 Bars]
2013 Volt replaced after 36 months/30k miles with ICE Rogue
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Re: Q: 120V emergency cord

Thu Jun 24, 2010 8:23 am

What you are contemplating ... can be found here: http://www.quick220.com/

This would give you 240V and (theoretically) cut the charging time in half. A Tesla owner has done this (http://www.teslamotorsclub.com/showthread.php?t=2998). But he also uses an intermediate device which solves the problem why I don't think this will work directly on the LEAF. At Level2 charging you need the pilot signal, not just the "juice". I could be wrong ... may be the LEAF can be fooled to think it is doing Level 1 charging (where no pilot signal is needed) but use the 240volts you supply anyway. Now your charging time is cut in half (and using the maximum 3.3kw for the initial LEAFs).

Remember, you need to combine two 120V circuits out-of-phase, but it is worth a try ...
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garygid
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Re: Q: 120V emergency cord

Thu Jun 24, 2010 8:57 am

Typically all the 120v sockets in one room (or both sides of one wall) are wired to one phase, to minimize the amount of wire needed.

CAREFULLY, one could identify two sockets, each on a different phase. Then, by constructing a "Y" type pigtail to plug into both sockets, get 240v, usually from 15-amp breakers (occasionally on 20-amp breakers). NOTE: most people should NOT attempt this.

Assuming the 15-amp breakers, that "connection" could provide 15 x 80% = 12 amps at 240v to power a 240v "EVSE".

However, without the "max current" square wave "control signal" to the car from a 240v EVSE ... the default might be "Error", so the EVSE-compliant LEAF would probably not charge.

Some extra circuitry would probably be required.

For a 120v EVSE, I think there might be a "max current" of 12 amps assumed without the square wave, and that default might also apply to the 240v EVSE.

Without the current J1772 standards document, I do not know for sure.
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Re: Q: 120V emergency cord

Thu Jun 24, 2010 9:05 am

@Gary: What you describe (quite well) in your first three paragraphs is what the Quick220 does for you -- safely. Which was the point of my post above. Now ... who's got the wherewithal to design the electronics for the pilot signal ?
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garygid
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Re: Q: 120V emergency cord

Thu Jun 24, 2010 9:39 am

I could do the design, if I have the correct standards document, and the necessary information is all there. Sometimes, in "standards", an important detail is left out.
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LTLFTcomposite
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Re: Q: 120V emergency cord

Thu Jun 24, 2010 10:17 am

The possibilities for shoddy half-assed electrical setups are pretty much unlimited. I've got a fair amount of experience doing electrical work though and feel there's a lot to be said for having properly engineered, certified equipment installed as it was intended. That said, you know there are going to be a lot of EV's charged by hot-wiring porch lights. It's all fun and games till somebody loses an eyeball.
LTL
White 2012 SV delivered 10 Dec 2011 returned 25 Nov 2014 replaced with stopgap ICE Sentra
[35 months] [35K miles] [9 Bars]
2013 Volt replaced after 36 months/30k miles with ICE Rogue
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evnow
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Re: Q: 120V emergency cord

Thu Jun 24, 2010 10:46 am

LTLFTcomposite wrote:The possibilities for shoddy half-assed electrical setups are pretty much unlimited. I've got a fair amount of experience doing electrical work though and feel there's a lot to be said for having properly engineered, certified equipment installed as it was intended. That said, you know there are going to be a lot of EV's charged by hot-wiring porch lights. It's all fun and games till somebody loses an eyeball.
You mean something like this is not upto code ?

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planet4ever
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Re: Q: 120V emergency cord

Thu Jun 24, 2010 2:45 pm

LEAFer wrote:At Level2 charging you need the pilot signal, not just the "juice". I could be wrong ... may be the LEAF can be fooled to think it is doing Level 1 charging (where no pilot signal is needed) but use the 240volts you supply anyway.
I don't think your level 1 pilot statement can be right. Level 1 goes through the same connector on the Leaf as level 2, and I am quite sure that level 1 charging uses exactly the same kind of handshaking as level 2; it is just that the car and the EVSE agree on a different voltage and amperage. Yes, I said EVSE. The 120V "emergency cord" is not just a cord. It has an EVSE built into it where it plugs into the wall.
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garygid
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Re: Q: 120V emergency cord

Thu Jun 24, 2010 4:26 pm

The EVSE "handshaking" (the Control Pilot wire) probably carries a different "DC" voltage to the car (maybe just one different resistor in the EVSE) to indicate 120v power instead of 240v power.

With "no" pilot signal (or perhaps some minimal, fixed-voltage pilot signal) from the EVSE, I think the car is to expect 120v and draw no more than 12 amps after the J-Plug is in place.

Someone with the J1772 specs (AndyH) might be able to tell us for sure.

I would look if I had the standards document.
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2010 Prius, now for sale
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2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

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