Battery % drop and range

[ChrisO]

I too have some anomalies.
I have had the charge fail by 1% to reach the target charge in FP.
Lose 1% backing out of my down hill drive.
Lose 3% in 300 yards at 20mph from my house
GOM predicts 250 miles
I seldom get less than 3.3 miles/kWh more often 3.7. Some values never appear!
I measure charge efficiency two different ways but often get readings where I get more energy in than comes out of my charger. Over many charges I get 95.1% & 96.7% which are sensible values.
Charge efficiency is at its lowest when charging to 100%
Overall from miles and kWh I get 3.2miles/kWh
I do a calculation which infers my battery capacity at 92.4kWh
My battery has been dealer checked and they say it is within spec.

I have sent all this to Ford and they say everything is tickety-boo, so being gullible, I don't worry about it any more. However I do still keep all my data!
The Ford support person said the GOM is deliberately pessimistic. (He didn't use the expression GOM )

The lose 1% right away is common from what I have seen. It isn't really because you lose 1% it is because it seems the GOM truncates, not rounds. 59.9999% truncated is 59%. I have charged to a given level and then backed my car out 15 feet and have the GOM drop 1%.

All of this is estimated; there isn't an any way to directly measure the SOC. Probably the best way you can tell how fast it really is draining is the "This Trip" number for miles per kWh, because it is at least doing it over time.

There is also this:

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[Rex]

The lose 1% right away is common from what I have seen. It isn't really because you lose 1% it is because it seems the GOM truncates, not rounds. 59.9999% truncated is 59%. I have charged to a given level and then backed my car out 15 feet and have the GOM drop 1%.

All of this is estimated; there isn't an any way to directly measure the SOC. Probably the best way you can tell how fast it really is draining is the "This Trip" number for miles per kWh, because it is at least doing it over time.

There is also this:

Thanks for that info. Rex

 

[Stoy333]

So, last night I got home with 3% charge. I plugged in and my battery percentage instantly jumped from 3% to 9%!!! I was shocked!

doing the ncm reset now….

 

[Mach-Lee]

So, last night I got home with 3% charge. I plugged in and my battery percentage instantly jumped from 3% to 9%!!! I was shocked!

doing the ncm reset now….

Yeah, there’s obviously about a 6% error there, it thinks your pack capacity is lower than it actually is.

Tip: use max defrost to get the pack below 5% instead of driving. Less worry about running out. The % will come back up after the pack rests, so drain it more if it goes much above 5%.

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