goldbrick
Posts: 966
Joined: Tue Aug 01, 2017 3:33 pm
Delivery Date: 01 Aug 2017
Leaf Number: 311806
Location: Boulder, CO

Re: What values of Hx is worrisome, if any?

Tue Oct 13, 2020 11:35 am

My quick swag is that the high battery resistance (low Hx) would have much more effect on range than trans fluid, etc. That and the high battery temp are probably the culprits. Is the range 'normal' on level roads?

I often use 2x the energy going up hills around here even though the regen on the way back down evens things out to nearly the same usage per mile as level ground. The heat generated by the I^2 * R losses in the pack is simply wasted. There is no way around that and if the R of you pack is high, running the car with high current is going to increase those losses.

Mormo
Posts: 3
Joined: Mon Oct 12, 2020 1:18 pm
Delivery Date: 12 Apr 2020

Re: What values of Hx is worrisome, if any?

Tue Oct 13, 2020 2:26 pm

LeftieBiker - thanks! I know that single bad cells & other defects are covered, just don't know how easy it is to get warranty service with occasional & not super obvious symptoms. No obvious bad cells in leafspy, no spectacular failures.

goldbrick - It seems to usually perform as expected on flatter roads. Reporting 4-4.1 mi/kwh average, which seems plausible and fits acceptably with the models. To confuse matters further I looked at logs for a shorter and steeper climb (12ish miles, 3600', 35-40mph) and car overperformed. Within model error for sure but still. Batt was 100% on level 1 just before & not too hot (85-93). Can those things really make the difference? I thought hot batteries notionally had lower internal R even as they were dying faster, but maybe it effectively drains the already weaker cells more? Or internal R isn't a great model for lithium cells.

Honestly thanks for the replies. It's the mystery of it that bugs me (and, of course, the prospect of stranding in the desert at midnight). If just have to be much more careful about heat & climbing combined, or top balancing under these circumstances, that's not so scary. Irritating but we can deal.

LeftieBiker
Moderator
Posts: 15518
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: What values of Hx is worrisome, if any?

Tue Oct 13, 2020 3:59 pm

I know that single bad cells & other defects are covered, just don't know how easy it is to get warranty service with occasional & not super obvious symptoms. No obvious bad cells in leafspy, no spectacular failures.
That's a problem, not having obvious, in-your-face symptoms. You will likely have to wait for them to worsen before trying a dealership.
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2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
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