Hi, I just bought a used 2011 Volt. I charged it and drove to work. When I got to work the battery had 4 miles remaining. After work the battery had zero miles remaining. Is that normal? Did I do something wrong? Please help!
We probably need a little more information like what was the temp to work and when leavin work? Did you remote start the car before heading home? I think I've seen my new car go from 3 to 0 before. One explanation could be that when you are driving and the battery is being used, it generates some heat during your morning commute thus it estimated that you had 4 miles left. But when you shut off the car, letting it sit all day the batteries return to the ambient temperature, thus hitting the threshold of being empty. Empty is a relative matter as the car is designed to charge the battery to something like 80% of true capacity where it shows up as 100% on your gauge! and empty is really 30% of capacity which shows up as empty on your gauge. So it could have gone from 35% down to 30% while sitting.Hi, I just bought a used 2011 Volt. I charged it and drove to work. When I got to work the battery had 4 miles remaining. After work the battery had zero miles remaining. Is that normal? Did I do something wrong? Please help!
I've never lost miles in mile's estimated left when the Volt has been parked at work for 9+ hours. Even in 110 degree weather. Didn't know this was happening to some. Maybe I never really looked at it close enough?
Temperature has everything to do with this. Assuming Maryland is still pretty cold in the mornings like my home state of IL, and you've driven 30+ miles! In say 50 degree weather, the battery will be pretty warm so given the current conditions it might think it has 4 miles left. It may even show 4 when it is 3.x miles remaining. Then you shut the car off and let it sit for hours. Let's assume that by the end of the day it is 65-70 degrees. The battery actually is cooler than when the car was shut off thus the battery won't have as much capacity. I could see losing a few miles of range. If the end of the day was 40-50 degrees, it could get worse.While I accept the fact that this is not particularly unusual behavior for the Volt (I "lost" 3 battery miles once after turning off the car, but never 4 or more), I do have to protest the idea that this behavior should be considered acceptable.
1. "It's just an estimate."
The displayed battery range is indeed an estimate. But the closer one gets to an "empty" battery, the smaller the possible error in the estimate becomes. So I don't see how this explanation makes sense. (If there is 0 miles worth of energy left, it doesn't matter how efficiently the Volt is guessing you will drive the next few miles. Zero is zero.)
Also, any questions about preconditioning or driving behavior on the morning commute are irrelevant, as far as I can imagine. Any energy use prior to turning off the car would already be reflected in the 4 mile estimate.
Based on the OP's profile, it appears that this scenario took place in Maryland. So I doubt that high heat was causing the TMS to chug away and drain the battery.
3. SOC swings
Here's where I suspect the truth lies. In CD mode the battery SOC falls a bit below the CS mode target SOC before the engine kicks in. So if you restart the car after it has dropped below that target SOC, it might "forget" that you had those 1-4 EV miles remaining and go straight into CS mode.
But I don't think it SHOULD operate this way. If anything, the battery voltage should rebound slightly while the car is off. So why not program it to deliver the same amount of battery energy after the car is restarted? (Assuming no significant TMS energy consumption while it's off.)