Re: [EVDL] LiFeYPo4 capacity in winter?
[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
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