Running out of electrons...
Discussion
for an i3;
"(As the battery ran down to empty) ... the GOM seems to always hit 1 mile remaining at 5-6% SoC. In this run-until-dead test it stayed at 1 mile until around 2%. So effectively, if you use the GoM to gauge range, it appears to provide you with around a 5% buffer.
Once you get under 3 or 4% SoC it starts taking away power blocks (the power gauge display changes to show reduced power available). At 2% battery and below acceleration is similar to a LEAF in turtle mode.
One thing to note - once it's down around 2% the heater doesn't work at all, even on defrost (the fan works but it blows only cold air).
(In response to question on how many miles he went once the GOM said 1 mile remaining) ... About 3.5 miles, but I was trying to get to 0 - that's 5% SoC, so you could stretch it to 5 miles if you had to. The GoM goes to 0 miles, then to "---", which is a big improvement over the LEAF which goes to the dashes at a much higher SoC (around 6% I believe). I still can't imagine running the battery down to this level with only the GoM to rely on."
https://www.mybmwi3.com/forum/viewtopic.php?t=1918
"(As the battery ran down to empty) ... the GOM seems to always hit 1 mile remaining at 5-6% SoC. In this run-until-dead test it stayed at 1 mile until around 2%. So effectively, if you use the GoM to gauge range, it appears to provide you with around a 5% buffer.
Once you get under 3 or 4% SoC it starts taking away power blocks (the power gauge display changes to show reduced power available). At 2% battery and below acceleration is similar to a LEAF in turtle mode.
One thing to note - once it's down around 2% the heater doesn't work at all, even on defrost (the fan works but it blows only cold air).
(In response to question on how many miles he went once the GOM said 1 mile remaining) ... About 3.5 miles, but I was trying to get to 0 - that's 5% SoC, so you could stretch it to 5 miles if you had to. The GoM goes to 0 miles, then to "---", which is a big improvement over the LEAF which goes to the dashes at a much higher SoC (around 6% I believe). I still can't imagine running the battery down to this level with only the GoM to rely on."
https://www.mybmwi3.com/forum/viewtopic.php?t=1918
thebraketester said:
.... what happens?
On the motorway at 80mph (maverick)... you run out of electrons, 0% battery. Which systems are kept active on a failsafe/backup/reserve amount of battery and for how long?
TBT.
Every EV will let you know your range and that you are low on charge and most will map closest chargers for you.On the motorway at 80mph (maverick)... you run out of electrons, 0% battery. Which systems are kept active on a failsafe/backup/reserve amount of battery and for how long?
TBT.
They warn you usually when your below 20%
They go into turtle mode at ~5-10%
The whole cars system outside the drivetrain runs off the 12v so it isnt going anywhere fast, so you'll keep lights,steering and brakes etc just fine.
uknick said:
Thanks will check it out. thebraketester said:
That's kind of my question. In an ICE engine you are on your own pretty much. In a EV is there a safety 'soft shutdown' routine.
First you start getting warning noises and messages from the car, warning you to find a charger. Then power gets limited, forcing you to slow down a bit. Eventually the car enters limp mode, and if you still ignore it and struggle on it eventually stops. There is a separate 12V battery so the car doesn't just turn off, but it won't move.In other words it's impossible to run out of power at 80 MPH on the motorway.
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