[EVfun]

Originally Posted by MN Driver

That's really good data, I know you've posted info like this before but I don't know what temperature you are at for that level of sag. I'm asking because I'm looking to use 60Ah cells and 2.7v at 5C is more than acceptable for my car(with more cells), we have a much colder climate here in Minnesota but all I really need is to get near the level of performance you have and I'd be more than set. I don't think I'll need to add much heat at all to get the performance I need but was wondering if aiming for a 32 degree pack temp on the coldest winter night would be fine, and if your data is at, say 40 degrees, I'd think I'd be all set.

It is really hard to say, but it is above 40F. Pack interior temperature right now is 82, inside the garage is 86, and outside is 74 (with 70% humidity, not very western WA), and the overnight low was 60.

I'm going to do some historical weather checking to figure out what my January was like before shooting off a number...

It looks like winter around here could have been well described as being 42 for a high and 29 for a low. The garage only rarely gets below freezing inside as I blow a little attic heat into it in the winter (but the garage isn't insulated, so it doesn't stick around.) I have to guess that the pack temperature gets down to between 45 and 50. It is really hard to say as I drive less but the garage runs further above outside temperature in the winter.

[Dougnutz]

@evfun Thanks for that info. I live in the western wa area too so your numbers are particularly relevant to me.

@everyone. I have noticed that the CA tends to change calibration, I haven't noticed why but it doesn't seem to have a big impact on the reading. I may be wrong so I will be watching that closely. I do leave it on all the time so that may attribute somewhat but I think the main difference is that the voltage is staying so much higher.

I live in a particularly hilly area and in the winter with cold batteries the voltage drop is very noticeable, this obviously requires more amps to do similar work. I'm starting to think that is what I have really noticed. Since I have been looking at Ah as a "fuel gauge". I'll start paying attention to the WH to see if there is a noticeable difference