[EVDL List]

Hello list members,

Ive read that these batteries capacity do remain nearly the same at cold temperatures. Is there any truth behind it / who has the necessary experience about this type of battery in winter temperatures? Please tell!

Thanks a lot!

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[EVDL List]

If your actual question is whether you will get the same range from them in
cold weather at least one person here in Idaho has told me he loses range
when it's cold. Not sure how
much.

Peter Flipsen
[quote] "Kirill Spitzer" <xxx@xxx.xxx> wrote:

> Hello list members,
>
> Ive read that these batteries capacity do remain nearly the same at cold
> temperatures. Is there any truth behind it / who has the necessary
> experience about this type of battery in winter temperatures? Please tell!
>
> Thanks a lot!
>
> _______________________________________________
> | Moratorium on drag racing discussion is in effect.
> | Please take those discussions elsewhere. Thanks.
> |
> | REPLYING: address your message to xxx@xxx.xxx.edu only.
> | Multiple-address or CCed messages may be rejected.
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[EVDL List]

I have a little experience driving in winter conditions with Thundersky.
The reasons are very similar to those that Davide mentioned.

I was getting pretty significant voltage droop as conditions approached 0C
(32F) ambient. My batteries weren't insulated and some of them were under
the hood so they saw ambient conditions pretty quickly.

I need 100A at 140V to cruise at 60 mph in the summer. In the winter, the
additional internal resistance caused the battery voltage to drop to 130V.
The current went to about 120A to compensate (get the same total kW to the
motor). This additional current caused my range to go down.

Mike

> -----Original Message-----
> From: xxx@xxx.xxx.edu [mailto:xxx@xxx.xxx.edu] On
> Behalf Of SLPinfo.org
> Sent: Wednesday, July 04, 2012 2:16 PM
> To: Electric Vehicle Discussion List
> Subject: Re: [EVDL] LiFeYPo4 capacity in winter?
>
> If your actual question is whether you will get the same range from them
in
> cold weather at least one person here in Idaho has told me he loses range
> when it's cold. Not sure how much.
>
> Peter Flipsen
> [quote] "Kirill Spitzer" <xxx@xxx.xxx> wrote:
>
> > Hello list members,
> >
> > Ive read that these batteries capacity do remain nearly the same at
> > cold temperatures. Is there any truth behind it / who has the
> > necessary experience about this type of battery in winter temperatures?
> Please tell!
> >
> > Thanks a lot!
> >
> > _______________________________________________
> > | Moratorium on drag racing discussion is in effect.
> > | Please take those discussions elsewhere. Thanks.
> > |
> > | REPLYING: address your message to xxx@xxx.xxx.edu only.
> > | Multiple-address or CCed messages may be rejected.
> > | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
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> >
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[EVDL List]

[quote] Kirill Spitzer wrote:

> Hello list members,
>
> Ive read that these batteries capacity do remain nearly the same at cold temperatures. Is there any truth behind it / who has the necessary experience about this type of battery in winter temperatures? Please tell!
>
> Thanks a lot!
>

Others have explained this effect is basically true and why so I won't go over that too other than to say in my experience I found not only loss of range with my LFP160s (bought 08'08) but also loss of power. Below 15 deg C it was significant but not wildly so, below 10 it was robbing me of about 30% of max power and below 0 about 50-60% power loss. THe other issue is associated voltage sag which limits your top speed.

Of course, some might argue that you wouldn't necessarily want to be able to accelerate rapidly in sub zero road conditions. So, there's a little serendipity going on there!

So the question is, how to get around the problem? Simple answer is to heat your batteries. IMO the simplest way of doing that is to put a domestic-type electric bed heater blanket under them and insulate the pack with foil bubble wrap-typ insulation. Power it from the mains when plugged in and the pack when not but usually the latter is not needed as the cells are kept warm by being used, driving.

This has all been covered before on the EVDL so I won't bore everyone with it all over again.

Regards, Martin Winlow
Herts, UK
http://www.evalbum.com/2092
www.winlow.co.uk

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