Charging while parked & unused (over 2 weeks) in cold weather - recorded data

[Maxx]

why the truck is still doing that after 2 weeks, which is when I thought it was supposed to deep sleep.

I don’t know how this truck thinks but wouldn’t deep sleep makes more sense when Truck is unplugged? At an airport long term parking, saving juice is more important than plugged in at home. Just speculating on how Ford maybe thinking.

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[MountainAlive]

I wonder what dealerships would do when these things would sit outside on the lots during the below freezing months.

 

[Maquis]

I wonder what dealerships would do when these things would sit outside on the lots during the below freezing months.

They let them sit right next to the ICE trucks. And they’re fine.

 

[Adventureboy]

The change in cycle is probably a combination of the temperature rise and your truck going into power saver mode. Much more frequent when the temperature was lower. I've seen the same on mine - in the -20°C range, it seems to heat once every 4-5 hours.
I am curious how many times your 12v battery cycled in that time. Unfortunately, when plugged in, it only charges the 12v when it is charging the HVB. I wonder if it also charges the 12v during a HVB heating cycle. If I had to guess, I'd say no. There are a couple of little sub-steps along the graph. That may be 12v charge cycles. It looks like 8 of them over the 16 days with 2 close to each other on the 17th - that may be the transition to power save mode. That is in line with my observed 2-day cycle on the 12v charging when it is cold and less frequent above freezing.

 

[dlwhitlinger]

The BMS is designed to heat the battery if the pack temp drops to an unknown temperature level regardless of any departure times being set. That is if the truck is connected to a level 2 EVSE. That would count for the majority of the KWhs used. Those temps would certainly trigger the BMS.

A smaller portion would be the BMS charging the 12v when it dropped to a predetermined low charge state.

In my opinion leaving the truck plugged in while away (or at all times, ABC) is the right way to go.

Does anyone know if the Charge Time setting effects the BMSs ability to heat the battery? I've had my truck set to only charge between 6pm and 6am. Does this limit the BMSs ability to temperature regulate outside of that charge window?

 

[The Weatherman]

I don’t have any authoritative source to quote however, based on the need to protect the battery from extremely cold conditions which can damage the battery, I believe the BMS does monitor the battery temp and will provide a heating level necessary outside your charging schedule.

There is a distinction between charging and battery heating.

 

[MattVT]

I don’t know how this truck thinks but wouldn’t deep sleep makes more sense when Truck is unplugged?

That would make sense to me too, but my understanding from what I had read was that deep sleep occurs have 2 weeks of no driving, regardless of charging / plugged-in status.

The change in cycle is probably a combination of the temperature rise and your truck going into power saver mode. Much more frequent when the temperature was lower. I've seen the same on mine - in the -20°C range, it seems to heat once every 4-5 hours.
I am curious how many times your 12v battery cycled in that time. Unfortunately, when plugged in, it only charges the 12v when it is charging the HVB. I wonder if it also charges the 12v during a HVB heating cycle. If I had to guess, I'd say no. There are a couple of little sub-steps along the graph. That may be 12v charge cycles. It looks like 8 of them over the 16 days with 2 close to each other on the 17th - that may be the transition to power save mode. That is in line with my observed 2-day cycle on the 12v charging when it is cold and less frequent above freezing.

When you say power saver mode, are you thinking that is what happens after ~7 days? If so, is that documented anywhere? First time I've come across that term, but it certainly aligns with how I read the charts.

I did include a graph of the 12V battery status, as reported via the FordPass API in Home Assistant. The data from the API is frustratingly infrequently updated, so it's hard to ascertain exactly what's happening, but it looks to me like the 12V battery dropped and then climbed back up again - twice. But they don't look like charging cycles because they're very slow to climb (multiple days), and they don't obviously seem correlated with outdoor temperature either.

The only other relevant data point to share is that in the most recent API update, it shows my battery voltage is 13.25V as of right now (still not driven since December 10). AGM batteries aren't my forte, but that seems high for an unloaded battery, so perhaps that's indicative that there's a trickle charger connected internally to it?

 

[TaxmanHog]

Does anyone know if the Charge Time setting effects the BMSs ability to heat the battery? I've had my truck set to only charge between 6pm and 6am. Does this limit the BMSs ability to temperature regulate outside of that charge window?

This time frame coincides with the coldest periods of time in general.

Are you defining the charging scheme with the Sync & Ford App, or through a third party type of EVSE (Emporia, others)?

With Sync, the truck will continue to draw energy if needed outside the "CHARGING" window but not specifically for charging, but to power the PTC and allow battery warming if/when the BMS thinks it's needed. Other EVSE's restrict energy delivery regardless of purpose.

 

[dlwhitlinger]

This time frame coincides with the coldest periods of time in general.

Are you defining the charging scheme with the Sync & Ford App, or through a third party type of EVSE (Emporia, others)?

With Sync, the truck will continue to draw energy if needed outside the "CHARGING" window but not specifically for charging, but to power the PTC and allow battery warming if/when the BMS thinks it's needed. Other EVSE's restrict energy delivery regardless of purpose.

Yeah, I have the Ford Pro Charger and set up the charge window via Sync and the Ford Pass app... Good to know that it will still take care of the batteries outside of the charge window settings. Thanks!

 

[Adventureboy]

That would make sense to me too, but my understanding from what I had read was that deep sleep occurs have 2 weeks of no driving, regardless of charging / plugged-in status.



When you say power saver mode, are you thinking that is what happens after ~7 days? If so, is that documented anywhere? First time I've come across that term, but it certainly aligns with how I read the charts.

I did include a graph of the 12V battery status, as reported via the FordPass API in Home Assistant. The data from the API is frustratingly infrequently updated, so it's hard to ascertain exactly what's happening, but it looks to me like the 12V battery dropped and then climbed back up again - twice. But they don't look like charging cycles because they're very slow to climb (multiple days), and they don't obviously seem correlated with outdoor temperature either.

The only other relevant data point to share is that in the most recent API update, it shows my battery voltage is 13.25V as of right now (still not driven since December 10). AGM batteries aren't my forte, but that seems high for an unloaded battery, so perhaps that's indicative that there's a trickle charger connected internally to it?

HA polling will probably prevent the truck from going into power saver mode so the longer cycles are probably just the warmer weather in your case. The HA API will keep modules alive or light them up when it polls. That could actually cause the 12v battery to discharge faster. Your HA information is probably not frequent enough to be accurate for tracking the 12v discharge cycles. My experience in the cold is that the 12v will cycle every few days (discharges to about 40% SOC then charges whether plugged in or not). It is much less frequent when it goes into power saver mode or if it is warmer. Unfortunately, the actual algorithm Ford uses for this is not published and it has changed over the years. It it triggered by a number of events like the 14-day limit but can also be triggered by discharge cycles - actual number of cycles is unknown but it used to be 1 when I first got the truck in 2023.
I track mine daily, although I don't have anything recent for more than a couple of days but here is an example of my 12v discharge rate. The jumps on Dec. 13th were driveway shuffles which involved uplugging, moving the truck and replugging, but over 2 days the 12v dropped below 50% SOC and then charged when the HVB charge cycle kicked off at 11pm Dec. 14th. It would probably been about 3-4 days without the driveway shuffles.

 

[MattVT]

HA polling will probably prevent the truck from going into power saver mode so the longer cycles are probably just the warmer weather in your case. The HA API will keep modules alive or light them up when it polls. That could actually cause the 12v battery to discharge faster. Your HA information is probably not frequent enough to be accurate for tracking the 12v discharge cycles.

Are you implying that polling the API actually directly polls the truck itself? My understanding is that polling the API is entirely independent of the connectivity between the truck and Ford’s servers, unless the API call I make is non-idempotent - ie requesting a change to some state such as remote start.

The API polling interval in Home Assistant is much faster than the data update rate itself.

Based on my 12V monitoring (infrequent as it is), I’ve not seen the 12V battery status drop below ~90% in the past 18 days of being parked up and plugged in. Combined with it currently reporting the voltage as 13.25V, that makes me think it’s doing something to actively maintain the 12V battery.

Either way, I find it super irritating and disappointing that there isn’t a better way to read data and telemetrics from the truck in near real-time. It’s sitting there with access to power and WiFi - it’s purely a business decision to restrict its communication to Ford’s poorly supported, cloud-dependent API.

If it weren’t for Ford’s recent demonstration of their lack of commitment to the Lightning, I’d rig up some local hardware to measure and track these things more accurately and reliably.

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