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Ingineer
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Re: Cost and time of 220v vs 110?

Wed Oct 17, 2012 12:43 pm

DaveinOlyWA wrote:ok 31 watts more than i had remembered but still not much.
Yes, the lost watts by themselves are not that significant of a difference, but as a percentage of what makes it into your pack, it's VERY significant! 76% vs 91%!

-Phil
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DoxyLover
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Re: Cost and time of 220v vs 110?

Wed Oct 17, 2012 12:48 pm

On adding circuits to a garage: if it is a detached garage, you will be required to have a sub-panel (small circuit breaker panel) in the garage. The National Electrical Code requires that out buildings be fed with a single circuit only.

Dryer outlets in the USA are (almost?) always 240V with plenty of amperage to run an EVSE. An electric dryer will always take more current than the converted EVSE brick.
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Ingineer
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Re: Cost and time of 220v vs 110?

Wed Oct 17, 2012 12:59 pm

DoxyLover wrote:On adding circuits to a garage: if it is a detached garage, you will be required to have a sub-panel (small circuit breaker panel) in the garage. The National Electrical Code requires that out buildings be fed with a single circuit only.
According to 250.32(A), exception; this is not required for a single circuit, and the multiwire branch circuit is considered one circuit. So in other words, running one UF romex to a detached garage with 2 hots (black/red) and one neutral with ground is perfectly acceptable w/o needing a subpanel. However current code requires a disconnecting means for the circuits located in the garage. (Though probably not when his structure was built.)

If you wanted to be compliant, The disconnecting means is allowed to be a double-pole snap-action switch, which is an easy addition.

-Phil
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Re: Cost and time of 220v vs 110?

Wed Oct 17, 2012 1:07 pm

EvaLeaf wrote:Our garage has both types of plugs -- regular 110 as well as a "large" plug that our dryer plugs into. We do not want to pay for any electricians fees or permanent upgrades to the house / garage itself as it is a rental, so we are considering going either trickle charge all the way or ESVE upgrade, which would be mobile.
First off, we have not had 110/220v in the US for the better part of a century. It's an old holdover. The proper nomenclature is 120/240v for single-phase residential power.
EvaLeaf wrote:1) Does the larger dryer plug mean we have 220V? Or would we have to confirm this in some way by hiring an electrician?
Yes you most likely have 240v at a minimum of 30a. To confirm, take a close look at the plug and determine it's type. It will be (usually) marked on the face, or you can just match it to a picture online. If you can't figure it out, snap a picture and post it here or email it to me.
EvaLeaf wrote:2) Is there a circumstance in which we would not be able to charge the Leaf using either 110v or 220v? E.g. our house is too old and it knocks out the power? Or would 110 always work, and 220 would be an issue? Again, we do not own the home so don't have a lot of history on the state of the electrical system.
If you use the dryer outlet, and there is nothing wrong with it, you should have no problems charging on 240v. The 120v outlets are another question. Since charging on 120v requires a continuous 12A (1.5kW) load, you may have trouble with old outlets (heat/burning) or if they are on shared circuits, you could experience tripping of your breaker when the circuit gets overloaded. (or worse!) The dryer outlet will be loaded way less than a dryer would load it, so it's unlikely even a worn outlet or wiring would cause any problems.
EvaLeaf wrote:3) I have a daily commute of 30 mi roundtrip (San Mateo / Mountain View, CA) with chargers available at work for a relatively pricey fee ($1/hr). We occasionally go up to the city (SF) on the weekends for a 40-50mi round trip. Should we consider 220 charging at home to be a deal breaker for us? We also have the option of our 2nd car & the train but if we get the Leaf I think we'd like to be able to use it :)
You can probably "get by" with only 120v, but there will definitely be occasions it limits your utility. As it is, the existing maximum of 3.3kW on 240v is limiting for many scenarios. This was the impetus for developing my 6.7kW upgrade. (Full charge in about 3 hours instead of 7)

-Phil
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davewill
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Re: Cost and time of 220v vs 110?

Wed Oct 17, 2012 1:20 pm

Here's a quickie guide to NEMA outlets. You probably have either a 14-30 or a 10-30. Either one can be used with the EVSEUpgrade to do 240v (L2) charging.
Image
http://en.wikipedia.org/wiki/NEMA_connector
Last edited by davewill on Wed Oct 17, 2012 9:36 pm, edited 1 time in total.
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Re: Cost and time of 220v vs 110?

Wed Oct 17, 2012 3:10 pm

Reddy
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Re: Cost and time of 220v vs 110?

Wed Oct 17, 2012 3:21 pm

Unfortunately this will never stop. We have most all of this listed in our FAQ as well, but people still would rather hammer out a post/email than RTFM.

:roll:

-Phil
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EvaLeaf
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Re: Cost and time of 220v vs 110?

Wed Oct 17, 2012 4:46 pm

Thanks to all who replied! Appreciate the links as well...I had already checked out the evseupgrade FAQ but really wanted to more get confirmation that the dryer outlet would be A-OK and was having a harder time digging up that specific info.

Will check it out tonight when I get home to see which one of the plug types mine is.

This is my first ever new car (have been driving a 1995 Camry since college) and on top of that an EV so want to make sure I do all my due diligence.

DaveinOlyWA
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Re: Cost and time of 220v vs 110?

Wed Oct 17, 2012 6:13 pm

EvaLeaf wrote:Thanks to all who replied! Appreciate the links as well...I had already checked out the evseupgrade FAQ but really wanted to more get confirmation that the dryer outlet would be A-OK and was having a harder time digging up that specific info.

Will check it out tonight when I get home to see which one of the plug types mine is.

This is my first ever new car (have been driving a 1995 Camry since college) and on top of that an EV so want to make sure I do all my due diligence.
that dryer outlet is more than ok. you only need a 20 amp 240 volts.
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Re: Cost and time of 220v vs 110?

Wed Oct 17, 2012 6:46 pm

110, 220, 340, whatever it takes!

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