MPT
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Re: 120V charging cord

Tue Apr 23, 2013 1:32 pm

Don,

Sound advice indeed - always check that your cable is rated at 12A or more even though the car only draws 8A - I selected a 15A rating - more is better!

It's a very stout brand new new cord with nice tight contacts - it's orange and grey striped so it's visible on most surfaces, choosing a 'heavy duty' cable means that the insulation is tough and durable and selecting a cable with a wide temperature rating, especially in the cold means that it won't crack in winter. My recommendation is http://www.homedepot.com/p/25-ft-12-3-E ... Xbu35Vlkw0 At $36 you can afford to throw it out if you see any cuts or nicks in the insulation.

The good (or bad... mostly bad) news is that the i-MiEV only draws 8A at 120v - this keeps the risk of the contacts heating quite low though the interface between the extension cord and EVSE does warm to the touch after a days use - us in an open, uncluttered trunk - there's probably a warning about that in the manual too!

Thanks.
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Don
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Re: 120V charging cord

Tue Apr 23, 2013 4:27 pm

MPT wrote:The good (or bad... mostly bad) news is that the i-MiEV only draws 8A at 120v
Many of us have modified the OEM EVSE so that it draws 12.5 amps . . . . at either 120 or 240 VAC

http://www.evseupgrade.com

Don
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MPT
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Re: 120V charging cord

Tue Apr 23, 2013 5:44 pm

Don,

Are you saying that the limit is imposed by the EVSE and not the charger? That would be awesome! I have a 15A 120v EVSE that came with my BMW, it'd be great if that'd encourage the car to draw more.
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Don
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Re: 120V charging cord

Tue Apr 23, 2013 5:51 pm

Yes, it is - The onboard charger is rated at 3300 watts, which is 13.75 amps @ 240 VAC. So long as your BMW EVSE is compatible with the J1772 standard, it will probably work with your car

The EVSE reports to the charger what is available, so far as the AC outlet the EVSE is plugged into and then the charger adjusts so as not to overload the outlet. All that's in the EVSE box is some computer circuitry to 'talk' to the car and a pair of relays to make the AC connection

Using the modified OEM EVSE plugged into a 20 amp 240 volt outlet, the car will recharge in 6 or 7 hours, compared to the 21 or 22 hours you're used to :D

Don
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MPT
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Re: 120V charging cord

Tue Apr 23, 2013 6:00 pm

That is great news! I have a 36 mile commute each way and only 120v access. At 960W it's not hitting 100% be the end of the day, at 1.65kW (its a 5-20R so i can set the EVSE to 15A) it'll easily hit a full charge with time to spare for a bit of preconditioning!

I'd foolishly assumed that the 120v EVSEs didn't bother with a pilot signal - that's Tesla's fault, their 120v cord is just a GFCI, no pilot; the car assumes a 12-15A circuit and watches for voltage sag.

...time for some testing...
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Don
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Re: 120V charging cord

Tue Apr 23, 2013 6:16 pm

If the 8 amp stock one is working for you, that might be the better choice for using at work - With your battery only halfway depleted from the drive to work, doing a 100% recharge with cell balancing and all twice per day isn't really good for the battery. If you're getting enough recharge at 8 amps to easily make it home, that's the way I would go

I do partial recharges most of the time (usually using my 12.5 amp OEM EVSE) and only fully recharge once every 6 or 8 days on average - Mitsu recommends that you do a full recharge at least every two weeks. The battery prefers being kept between 40% and 80% or so . . . . you're not 'hurting' things with full recharges - It's just that current thinking is that it's better if you don't let it set with a full charge any more than necessary

Don
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MPT
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Re: 120V charging cord

Fri Apr 26, 2013 11:34 am

Well, I tried the BMW 12A (it turns out) EVSE today, the car was charged by lunch time!

Thanks for the tip.
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dumemama
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Re: 120V charging cord

Sat May 25, 2013 10:36 pm

FYI, I charge every single day with an extension cord: 10 gauge, 100', rated for 15a, $150 at homedepot. I only have access to 120v. I've been doing this for over a year, sometimes twice a day - I have one at home and one at work. This is of course not ideal and probably costs me a few pennies and minutes a day in voltage loss. An EV would not be possible for me otherwise. I've noted no charging or capacity issues.

I expect that the admonition in the manual is for liability purposes. I like the idea of putting the brick in the boot, esp to keep it and the connection out of the rain.
-Barb
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acensor
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Re: 120V charging cord

Sun May 26, 2013 7:22 am

Don wrote:If the 8 amp stock one is working for you, that might be the better choice ............Mitsu recommends that you do a full recharge at least every two weeks. The battery prefers being kept between 40% and 80% or so . . . . you're not 'hurting' things with full recharges - It's just that current thinking is that it's better if you don't let it set with a full charge any more than necessary.
Don


Hi Don,
As you know from later posts, Mitsubishi sent letter/revision to the manual reducing that almost fully discharge then fully charge recommendation to once (or maybe it was "twice" a year). And it seems that recommendation they say is about calibrating the power remaining (the bars) meter.
I missed that thing you mentioned about a full charge balancing the cells. What's the story on that? Is the idea that it's for that reason it's good to full charge once in a while as long as we don't leave it stored in that state a prolonged time.. Let alone at hi temp?

Alex
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Don
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Re: 120V charging cord

Sun May 26, 2013 8:07 am

Yes. If you charge using a wattmeter, you'll notice that the current really tapers off during the last 30 minutes or so. This is when the BMS does it's cell balancing dance. It's probably a good thing to fully charge once in a while just for this reason, but it's not something that needs to be done on every recharge, so stopping the charge at 70 or 80% does no harm . . . . in fact, doing so will likely lengthen the overall life of the pack

Don
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