Quick Drop in SOC?

[Dukhudo]

Had a weird quick drop in my state of charge today. Charged to 99.5% (123.21kwh), went to the hardware store.

25km highway at 100km/hr followed by 2.5km at 60km/hr on the way there. There was a tailwind so I used 5%.

Now here's the weird part.

Left the store about 30 minutes later, Started at 94%, but dropped quickly to 86% over the 2.5km at 60km/hr. I didn't think I would make it home based on the quick drop. Once I hit the highway, I got back up to 100km/hr for the remaining 25km and the usage leveled off and it dropped 5% (headwind) ending up at 81% (97kwh).

Never experienced this random drop before in the truck. Any ideas? No warnings came up on the display.

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[Scorpio3d]

You lost me at km-
How often do you fully charge not to mention how do you charge to 99.5%?

 

[Dukhudo]

I charge up to 100% about once a month for long trips. The rest of the times it I charge to around 80-90%.

99.5% comes from car scanner.

Adding for translation lol. 100km/hr ~ 60mph. 60km/hr ~ 35 mph. 25km ~ 15 mi. 2.5km ~ 1.5 mi.

 

[bub]

What temperature was it? How long was your stop before you drove home? Was it uphill on the way back? I've noticed my range drops off quickly at the start of my trip and then levels off. I'm guessing its conditioning the battery to the right temperature.

I also don't think the state of charge indicator around 80-100% is totally accurate. Just from watching the energy going in the battery when charging.

Anyways, I feel like you're overthinking it.

 

[Scorpio3d]

I have not seen anything like that but I don’t always use my Car Scanner I just usually use the guess o meter. I have Lariat as well, but have the ER wouldn’t think that would make it difference though.

 

[Dukhudo]

24 Celsius. 30 minutes before I came back out. No big hills, pretty much flat.

I’ve never experienced anything like this. To drop 8% in 1.5 miles. I don’t think I could do that if I floored it the entire way.

 

[Grumpy2]

Were you reading the Scanner for the SOC? How did it compare to the SOC within the Truck?
I agree it probably isn't anything to be concerned about.

 

[02Reaper]

There's been a thread or two on this. Ford blames it on the bms being out of balance or something like that, but last night I noticed it first hand using car scanner comparing the SOC vs SOC DISPLAY. Here is a picture of them pretty close, but I was seeing at some points last night where the SOC may be 50% but it was displaying 53%. I don't know why Ford can't match it up. Its right there.

 

[Heliian]

Did you charge with 120v?

 

[Grumpy2]

Your scanner is only an estimate as is that shown on the truck.

I consider the displayed SOC can be 3-4% higher than actual, after reading here about folks that have suffered a 5-7% sudden loss just before going "empty".

Our gas gauges have never been very accurate too. Relax and live with it, just don't trust going below 15% repeatedly.

 

[Dukhudo]

I did charge with the 120v. Is that causing an issue?

I don’t usually worry, when the SOC is a bit off, but it dropped so fast that I thought I wouldn’t make the rest of the trip home. 8% over 2.5km at slow speeds would’ve been over 80% over 25km at highway speeds if it continued. So I got range anxiety at 86% battery…didn’t like that feeling.

 

[potato]

SOC is the actual battery SOC including the buffers at the top and bottom end. SOC display is the % of the usable range. So the displayed SOC will be lower than the actual SOC when at full charge, will be the same somewhere in the middle, and will be lower at a low state of charge. All numbers according to the battery management system's best estimate.

But yeah, that big a drop is obviously not the battery itself losing that much charge that fast. There would be fireworks It must be the BMS getting confused.

 

[richl025]

There's been a thread or two on this. Ford blames it on the bms being out of balance or something like that, but last night I noticed it first hand using car scanner comparing the SOC vs SOC DISPLAY. Here is a picture of them pretty close, but I was seeing at some points last night where the SOC may be 50% but it was displaying 53%. I don't know why Ford can't match it up. Its right there.

What kind of "scanner" is this you are using?

 

[Zprime29]

I agree, I wouldn't be concerned unless it's dropping like that on a consistent basis. If you see it happen again, check the trip energy usage screen and see says as far as where the energy is going. May or may not help pinpoint an energy vampire. Since the BMS is largely basing SOC off voltage and voltage is not static (even when turned off), it will sometimes behave out of the norm.

I had a time where I charged to 100% on 120v, drove 10 miles on the highway (60-70mph) to get lunch with family. After lunch, I got in and started up...still had 100% charge. I'm fairly certain its from the battery warming up in the sun from getting cold soaked while outside overnight.

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