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Re: We need a portable 240v EVSE

Posted: Sun May 08, 2011 4:58 pm
by TEG
Given that the built in charger is lethargic (only 3.3kW, not even 6.6kW) and CHAdeMO L3 has not materialized in the USA, would it be possible to make a mid-range external charger that plugs into the L3/DC port?
For instance, it could have a 50AMP NEMA14-50 to plug in at campgrounds and supply 10kW+ charging through the DC port?
Perhaps also a J1772 adapter as there are public Tesla HPCs being converted to J1772 around, and they can offer, 32A, 40A, and higher. The included portable EVSE (even with the 240V mod) can only draw a tiny fraction of that.

If someone built a box with NEMA14-50 and J1772 and could output 10kW+ to the L3 I would certainly buy one.

Re: We need a portable 240v EVSE

Posted: Sun May 08, 2011 5:01 pm
by SteveInSeattle
Don't forget that they have 240v in Europe (no 120 at all)..so the Nissan/panasonic charger sold with the Leaf there has to be 240.. it exists, why not just make it an option?

Re: We need a portable 240v EVSE

Posted: Sun May 08, 2011 6:13 pm
by DarkStar
TEG wrote:Given that the built in charger is lethargic (only 3.3kW, not even 6.6kW) and CHAdeMO L3 has not materialized in the USA, would it be possible to make a mid-range external charger that plugs into the L3/DC port?
For instance, it could have a 50AMP NEMA14-50 to plug in at campgrounds and supply 10kW+ charging through the DC port?
Perhaps also a J1772 adapter as there are public Tesla HPCs being converted to J1772 around, and they can offer, 32A, 40A, and higher. The included portable EVSE (even with the 240V mod) can only draw a tiny fraction of that.

If someone built a box with NEMA14-50 and J1772 and could output 10kW+ to the L3 I would certainly buy one.
As soon as the CHAdeMO protocol is available to the public, I know of at least one company that will do their best to manufacture one. I spoke with them a bit a couple months ago and we felt that starting with a 12 kW version would probably be the most popular since it would only require a 50 amp outlet. :D

Re: We need a portable 240v EVSE

Posted: Sun May 08, 2011 9:04 pm
by garygid
240v and 50 amps -> something over 2 to 2.5 hour charging.

That is a substantial speed-up over 240v 16 amp 7 to 8 hour
charging, and about 4x better than the Mod-L1 EVSE (240v
and 12 amps, about 10-hour charging).

Note: Some RV Parks only provide 40 amps at their "50-amp" sites.

Re: We need a portable 240v EVSE

Posted: Sun May 08, 2011 9:11 pm
by smkettner
garygid wrote:Note: Some RV Parks only provide 40 amps at their "50-amp" sites.
Never heard that and I have stayed at a few.

Although a 40 or 45 amp design load might be best for a 50a breaker.

Re: We need a portable 240v EVSE

Posted: Sun May 08, 2011 9:23 pm
by garygid
I just read about the 240v 40-amp circuits behind the 50-amp
14-50 socket ... written by folks that sounded like they
had the experience. Their point was that one could not
absolutely count on getting 50 amps, so it was best to
check things out at the specific RV park in question.

Re: We need a portable 240v EVSE

Posted: Sun May 08, 2011 9:38 pm
by DaveEV
If you have a constant load, NEC only lets you pull 80% the rated ampacity of the circuit - so 40A on a 50A circuit would be appropriate. That's why the L1 EVSE only pulls 12A on a 15A circuit.

Either way - a 9.6 kW charger that plugs into a 50A circuit would no-doubt be popular - especially if it's somewhat portable.

Re: We need a portable 240v EVSE

Posted: Sun May 08, 2011 10:00 pm
by johnr
SteveInSeattle wrote:Don't forget that they have 240v in Europe (no 120 at all)..so the Nissan/panasonic charger sold with the Leaf there has to be 240.. it exists, why not just make it an option?
You do know about the 240V conversion of the Panasonic EVSE, right? Not Nissan authorized, but still....

Re: We need a portable 240v EVSE

Posted: Sun May 08, 2011 10:15 pm
by garygid
I am using the Mod-L1 EVSE (240v 12 amps) and so is my friend,
and we have the 3rd Nissan L1 EVSE unit sent in for the Upgrade now.

See www.evseupgrade.com

Very helpful, using the Mod-L1 on 240v (still 12 amps) cuts
charging time in half, from 20 ours to 10, a SUBSTANTIAL gain.

Re: We need a portable 240v EVSE

Posted: Sun May 08, 2011 10:46 pm
by TEG
Various public Tesla HPCs are being converted to J1772.
Like this one in Vacaville labeled for 32A usage:
Image

Having some way for the Leaf to be able to draw at least 32A of 240V would be very useful.
Stuck at < 16A sucks. (Or doesn't suck enough depend on how you look at it.)