cattlerepairman
Posts: 31
Joined: Fri May 05, 2017 8:41 am

"Dramatic" reduction in cold weather range. Why?

Fri Dec 03, 2021 11:19 am

2017 eGolf, 70k Km

I have driven my eGolf for 3 winters, this is winter #4. SAME everything, even same winter tires (getting worn, but still...).
eGolf lives outside, under a car port, so the battery gets good and cold.
The ONLY difference from the last winters is that I tend to drive off without having used the eManager to preheat the car (due to more unpredictable schedule).

I was used to a range of roughly 170 km in cold weather. "Cold" being around -10/-15 degrees Celsius. Around 180/185 km range at around freezing.

NOW I am lucky to squeeze out 160 km in moderate weather (around 0 - plus 3 degrees), at times even less, maybe 150 km (like yesterday, and it was relatively "warm" at plus 5. I had the cabin heat turned down to 20 degrees C which I normally do).

What I notice is that CONSUMPTION seems way up. In the warm time of the year I see 13-14 kWh/100 km (on normal mode, not driving particularly range-consciously). When cold I used to see 17-18 kWh.

NOW I am seeing 19-22 kWh/100km, with around 20 kWh being common.

So, I do not think that it is a scenario where the battery lost capacity that badly,

WHAT'S HAPPENING??

I checked the service brakes for sticking/binding - cleaned and lubed and all good. Nothing dragging.

Now that I am writing this, I am thinking, with the cabin pre-heat, the battery supplies a good current to the heater and receives a good current from the charger at the same time. That would cut down on the heater draw when leaving and it would also have brought the battery temperature up a little bit, from having the current flow for at least 15 mins or so before driving off. Hmmmm. Maybe that is all it is? Such a huge effect from a small activity? What do you think?

f1geek
Posts: 959
Joined: Fri Jan 23, 2015 1:18 pm
Location: SF Bay Area

Re: "Dramatic" reduction in cold weather range. Why?

Fri Dec 03, 2021 1:50 pm

I do not think charging the battery pack will warm it much since the C rate is so low, but pre-heating the cabin will make a big difference, as that is ~5 kW draw, I believe if the PTC heater is running (I can't remember if it says 5 kW or 4 kW - it has a sticker on it that you can check).
2017 e-Golf LE, Multi Coat White with Black Vegan Leather interior

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