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Ingineer
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Re: Nissan L1 EVSE third-party upgrade to both 120V and 240V

Thu Mar 24, 2011 11:16 am

greenleaf wrote:
Bassman wrote:Ingineer,
Can a 5000 watt step up transformer be used to power your modified L1/L2 EVSE? I see a 5000 watt Seven Star Step up Transformer Voltage converter that says it can be operated continuous at 80% and will make a 120 volt outlet a 240 volt.
No it will not work with a single outlet.

As mentioned by others, the maximum power available from a single 15A 120V outlet is limited to 1800W. Any higher current would trip the breaker.
Well, many residential outlets are served by 20A circuits these days, so you can get by with 2.4kw (resistive) if you were to push it, though it's not advised. The minimum you'd need would be probably around 25 amps, which you are unlikely to find anywhere in a residential setting. In fact, the only place you would ever be likely to see a 120V 30A outlet, is the old RV plug standard, though many places only offer a NEMA 14-50 and 5-15/5-20 these days.

Not to mention that a 3kw transformer (minimum needed) is going to be very bulky and extremely heavy!

The "Quick220" is a much better solution if all you have access to are standard residential 5-15 outlets, but again; try to find a dryer outlet first, that's your best/safest option!

-Phil
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Re: Nissan L1 EVSE third-party upgrade to both 120V and 240V

Thu Mar 24, 2011 11:19 am

IF IF IF one had a 30A 120v circuit (max 24A continuous), the 1:2 transformer would give 240v at 12A continuous, just enough for the mod-L1 EVSE.

HOWEVER, a 240v circuit would usually be much easier/better.

The 33-amp value above is incorrect, should be 24 amps, I believe.
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Re: Nissan L1 EVSE third-party upgrade to both 120V and 240V

Thu Mar 24, 2011 11:20 am

Ingineer wrote: ... A lot of residential wiring is 14awg, and on many more recent installations, they use the friction-lock back wiring to daisy-chain the outlets. Drawing a continuous 12A on such systems could waste a lot in heat in the walls, all the while slowing down your charge.

If you do use a device like that "Quick220", (should be called a Quick240, really) try to make sure you choose outlets as close to the breaker panel as you can.

-Phil
The same advice would, of course, apply to using even the unmodified EVSE on a 120V line.

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Re: Nissan L1 EVSE third-party upgrade to both 120V and 240V

Thu Mar 24, 2011 11:21 am

We have 20 amp 120 volt outlets at work and I already have the transformer from when I worked overseas. I use it to power 220 volt equipment bought while in Hong Kong. Irealize that the Quick 220 is a better solution, but it means spending an additional $240 plus shipping.
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Re: Nissan L1 EVSE third-party upgrade to both 120V and 240V

Thu Mar 24, 2011 11:24 am

mwalsh wrote:

Also take care not to overload your panel. Always bear in mind what you're currently using before adding a new circuit.
ok, not even close. house was designed for central air which it does not have. 200 amp panel, total amps on the panel now is . the thing is barely half full.

**edit** sorry about that. my son is messing me up here

it has a total of 90 amps of 220 a 40 a 30 and a 20
on 110
5@20 amps
6@ 15 amps

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Re: Nissan L1 EVSE third-party upgrade to both 120V and 240V

Thu Mar 24, 2011 11:33 am

davewill wrote:
Ingineer wrote: ... A lot of residential wiring is 14awg, and on many more recent installations, they use the friction-lock back wiring to daisy-chain the outlets. Drawing a continuous 12A on such systems could waste a lot in heat in the walls, all the while slowing down your charge.

If you do use a device like that "Quick220", (should be called a Quick240, really) try to make sure you choose outlets as close to the breaker panel as you can.

-Phil
The same advice would, of course, apply to using even the unmodified EVSE on a 120V line.
Actually it's worse on 120V, as you also have the Neutral return to worry about! That doubles the heat in the same wiring, as compared to the "Quick220" method.

This is why there are warnings on the EVSE and we also require people who submit their EVSE's for upgrade to acknowledge this in our release form. It's definitely possible that if you plugged a 12A load into a worn-out receptacle or used a cheap power-strip, etc, you could start a fire before any breakers would trip!

Luckily, the Leaf's charger will detect appreciably high voltage drop and stop charging, which adds some extra safety.

-Phil
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Re: Nissan L1 EVSE third-party upgrade to both 120V and 240V

Thu Mar 24, 2011 11:37 am

Bassman wrote:We have 20 amp 120 volt outlets at work and I already have the transformer from when I worked overseas. I use it to power 220 volt equipment bought while in Hong Kong. Irealize that the Quick 220 is a better solution, but it means spending an additional $240 plus shipping.
As the above posts mention; there is almost no way you can use a transformer, as you'd need a 30 AMP circuit which you simply don't have. And I seriously doubt that transformer is rated for 3kva! It's probably half that at best!

Try it, and you'll likely pop a breaker within seconds, and/or possibly either burn up the transformer!

DON'T!

-Phil
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Re: Nissan L1 EVSE third-party upgrade to both 120V and 240V

Thu Mar 24, 2011 11:41 am

DaveinOlyWA wrote:
mwalsh wrote:Also take care not to overload your panel. Always bear in mind what you're currently using before adding a new circuit.
ok, not even close. house was designed for central air which it does not have. 200 amp panel, total amps on the panel now is . the thing is barely half full. <snip>
This is definitely worth verifying, but even the 100-year-old victorians around this area with knob-and-tube wiring can usually handle 12A as long as nothing else is on the circuit. I've seen some of these with only two 20 amp circuits! But in theory, you could still use a Quick220 and charge at 240v as long as you make sure everything substantial in the house is off, and that the wiring and outlets are in good enough condition to do this safely.

People in those buildings run 1600w space heaters all the time!

-Phil
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garygid
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Re: Nissan L1 EVSE third-party upgrade to both 120V and 240V

Thu Mar 24, 2011 11:56 am

Phil,
Do you still have any new, modified EVSEs for sale (no exchange)?
A spare EVSE would be handy.
Thanks, Gary
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Re: Nissan L1 EVSE third-party upgrade to both 120V and 240V

Thu Mar 24, 2011 12:13 pm

garygid wrote:Phil,
Do you still have any new, modified EVSEs for sale (no exchange)?
A spare EVSE would be handy.
Thanks, Gary
We keep going out of stock! We should have another unit in next week, I can let you know if you like. If you would, please send us a message using the form on the site, that way we can keep a list of who wants what and make sure first come is first served.

-Phil
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