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Cold Weather Chart

Posted: Wed Sep 26, 2012 1:49 pm
by nt2w
Hi all-

The leaves are falling in northern New York and we're looking at frost any day now.

It brings me to start thinking of winter conditions, specifically low-temperature considerations for the i.

I tried my hand at putting together a "Low Temperature Reference Chart," which pulls together information from three different pages in the i manual.

It's crude, but useful in explaining what will happen when the thermometer drops below 5F. I tried to illustrate going from green to yellow to orange to pink (red doesn't reproduce well).

It would be nice if someone graphically inclined could put something together that was a little more slick, but here's the "first draft!"

Image

https://docs.google.com/open?id=0B0Rqdv ... m40d1drR0E

Re: Cold Weather Chart

Posted: Thu Sep 27, 2012 9:08 am
by sandange
I Like what you've done there nt2w

Might take a shot at it but I'm tight for time at the moment, do modify or improve it in rough draft if you can for now.
Sandy

Re: Cold Weather Chart

Posted: Thu Sep 27, 2012 11:41 am
by MLucas
Here's my attempt at it. Thanks for putting this together, nt2w.

Image

Re: Cold Weather Chart

Posted: Thu Sep 27, 2012 1:57 pm
by sandange
Nice work guys

A couple of questions -- at -30c it indicates the battery warmer is off and car will not charge

Does this mean "IF the battery warmer is off" that the batteries will freeze and not charge

Why would the battery warmer be off- " due to depleted drive battery? & or not having been plugged in at those temperatures?

Or

Does the battery warmer stop working at those temperatures?

Re: Cold Weather Chart

Posted: Thu Sep 27, 2012 6:12 pm
by nt2w
MLucas wrote:Here's my attempt at it. Thanks for putting this together, nt2w.



Very nice! Clearly you have the knack for something like this, and I got a real chuckle from the skull-n-bones, which pretty much sums it up at -30C.

Couple editorials: first off, "Celsius" needs to be correctly spelled. Second, according to the manual, the battery warmer cuts off at -15C, not -20. Also, the 30% power reduction kicks in at -15C, not -20. Finally, in addition to the 30% or 50% power reduction, the manual indicates a reduction in regenerative braking at these points as well, if there's a way to indicate reduced regen below -15C, that would be good.

Again, this is fabulous and exactly what I had in mind! Thanks for lending your creative touch!

Think warm thoughts.... :D

Rich

Re: Cold Weather Chart

Posted: Thu Sep 27, 2012 6:21 pm
by nt2w
sandange wrote:Nice work guys

A couple of questions -- at -30c it indicates the battery warmer is off and car will not charge

Does this mean "IF the battery warmer is off" that the batteries will freeze and not charge

Why would the battery warmer be off- " due to depleted drive battery? & or not having been plugged in at those temperatures?

Or

Does the battery warmer stop working at those temperatures?


I guess the easiest answer is that, according to the manual, at -30C, nothing works and you need to flatbed the car to somewhere warm.

The manual doesn't explain why nothing works below -30, but it indicates that the battery warmer kicks in when the car is plugged in to charge and the temperature is below -25C, and that it uses the car's heater, supplied by the EVSE, to bring the battery up to -20 before it shuts the heat off. I'm assuming from this that the battery wants to be above -20C, or about 0F to accept charge current.

As far as why the battery warmer won't work, I can't understand it either :? Maybe it's that Mitsubishi figures the little ceramic heater isn't up to the task of bringing a relatively large thermal mass (the battery) up from a temp that low.

As with other things in the manual, the way it's WRITTEN may well not be exactly the way it works in PRACTICE-- something may have gotten lost in the translation!

Re: Cold Weather Chart

Posted: Fri Sep 28, 2012 8:31 am
by MLucas
Thank you for the feedback! I knew something didn't look right about the word celsius, oops. It's closer this time, feel free to send me more feedback, I'm used to this kind of thing. I'm a software engineer and can do a bit of hair and makeup on the business productivity systems I develop.

(See my original posting to this thread, I simply edited it with the new chart). Feel free to do what you want with it, I'm not claiming any copyright on this.

About operating the car below -30c. Maybe the car is smarter than an operator that would want to go out in that kind of temperature. :shock:

Re: Cold Weather Chart

Posted: Fri Sep 28, 2012 10:28 am
by sandange
About operating the car below -30c. Maybe the car is smarter than an operator that would want to go out in that kind of temperature.


Yes I agree, Who would want to.
But in our neck of the woods sometimes you have to in these conditions.
Might need to get to work or for an emergency to a hospital.

I'll be putting the car in the garage on those cold days.

Re: Cold Weather Chart

Posted: Fri Sep 28, 2012 6:03 pm
by nt2w
MLucas wrote:Thank you for the feedback! I knew something didn't look right about the word celsius, oops. It's closer this time, feel free to send me more feedback, I'm used to this kind of thing. I'm a software engineer and can do a bit of hair and makeup on the business productivity systems I develop.

(See my original posting to this thread, I simply edited it with the new chart). Feel free to do what you want with it, I'm not claiming any copyright on this.

About operating the car below -30c. Maybe the car is smarter than an operator that would want to go out in that kind of temperature. :shock:


Sweet- this is the chart that Mitsubishi should have included in the manual. One last nitpick- now that "Celsius" is fixed, need to fix "Fahrenheit" (much harder word :) ) Oh, and there's a remnant of your mouse pointer in the upper left!

Thanks again for your efforts. Still like the skull-n-bones.... arrrrrrr!

You, Sandange and I are all roughly at the same latitude--- we'll see what this winter brings! I always joke that summer in the North Country is just two weeks of lousy ice skating!

Rich

Re: Cold Weather Chart

Posted: Fri Sep 28, 2012 6:23 pm
by nt2w
sandange wrote:
About operating the car below -30c. Maybe the car is smarter than an operator that would want to go out in that kind of temperature.


Yes I agree, Who would want to.
But in our neck of the woods sometimes you have to in these conditions.
Might need to get to work or for an emergency to a hospital.

I'll be putting the car in the garage on those cold days.


-30 has been pretty rare up here the last few years, but not unheard of. I checked my records for winter '11 and '12.

I had seven days in '11 below -20C (two were below -25C with a low of -32.2C- the only one below -30- on 24 Jan 2011).

Winter '12 was wimpy, with NO days below -20C- the lowest temp in 2012 (so far...) was -19.4C on 3 Jan 2012.

Even on the coldest days, my garage only gets down to about 10F (call it -10 ish Celsius), so charging shouldn't be a problem... more likely an issue with leaving my car in the parking lot at -20C all day, and driving home. We'll see.

At least there are no mosquitoes or black flies at that temperature.... :D