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MattVT

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Our 2025 Lariat has been parked, completely unused, for a little over 2 weeks (since December 10), and I've been collecting data on the power drawer. It is plugged into a Level 2 charger (Emporia EVSE) with no limitations configured on the truck or charger about when it can charge - maximum available current is 48A. The State of Charge limit is set to 80% and it was at that level before we left it. No Departure Times are configured.

Ford F-150 Lightning Charging while parked & unused (over 2 weeks) in cold weather - recorded data Screenshot 2025-12-27 at 10.03.06 PM


The truck is in Vermont where, as you can see from the bottom chart, temperatures have largely been below freezing, dipping as low as -4°F (-20°C), but averaging somewhere around 20°F (-7°C). We locked up the truck and left it on December 10. On December 23 I connected via FordPass and remote started the truck, just to see if that would have any effect on the sleep.

The top chart above shows cumulative energy usage in December, so essentially each time the line goes up, that's the truck pulling power. It looks like a pretty distinct change in behavior around December 17, exactly 1 week after the truck was last used. While it does appear to pull more power (in both frequency and total energy) in colder temperatures, it definitely seems to have slowed down after the first week.

I'll be honest, I was somewhat surprised to see how much energy it's used - approximately 70kWh in 17 days, so an average of somewhere around ~4kWh per day. I realize I could have unplugged it and put it in "storage", but I was honestly just intrigued to see what would happen if I left it plugged in.

Another notable point is that it does not appear to have changed behavior 2 weeks after I last used it, which I had expected based on what I had read. Perhaps remote starting it after 13 days was enough to stop that, perhaps something has changed, or perhaps I misunderstood how the deep sleep works. Regardless, I can confirm that it pulled power today, the last refresh in FordPass via Home Assistant was 7 hours ago, and there's nothing in the FordPass app suggesting it's gone to sleep.

It also looks like it is keeping the 12V battery charged:

Ford F-150 Lightning Charging while parked & unused (over 2 weeks) in cold weather - recorded data Screenshot 2025-12-27 at 10.12.07 PM


So anyway, no real question here, but just thought this was interesting as I hadn't seen data from a truck left plugged in for a prolonged period (> 2 weeks) in cold conditions recently.
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The Weatherman

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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.
 
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MattVT

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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.
Yup, I was banking on that happening and that’s what the graphs show. What I’m unclear on is to why the behavior changed after 1 week, and why the truck is still doing that after 2 weeks, which is when I thought it was supposed to deep sleep.

Either way, I’m not unhappy with what it’s doing, just intrigued by the nuances of its behavior.
 

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Wonder if the change in behavior is due to an improvement in the local temps?
 
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MattVT

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Wonder if the change in behavior is due to an improvement in the local temps?
I don’t think so - that’s why I stacked the two charts. It looks like in the first week, it was pulling power much more frequently, and then it, well, looks like it went into a reduced power mode - what you might call “light sleep”. But after 1 week. And not deep sleep.
 

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Our 2025 Lariat has been parked, completely unused, for a little over 2 weeks (since December 10), and I've been collecting data on the power draw.
Any chance you have/can produce the non cummulative graph for the same period ?
That would show each heating / conditioning event more clearly.
 

jeep2liberty

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Our 2025 Lariat has been parked, completely unused, for a little over 2 weeks (since December 10), and I've been collecting data on the power drawer. It is plugged into a Level 2 charger (Emporia EVSE) with no limitations configured on the truck or charger about when it can charge - maximum available current is 48A. The State of Charge limit is set to 80% and it was at that level before we left it. No Departure Times are configured.

Screenshot 2025-12-27 at 10.03.06 PM.webp


The truck is in Vermont where, as you can see from the bottom chart, temperatures have largely been below freezing, dipping as low as -4°F (-20°C), but averaging somewhere around 20°F (-7°C). We locked up the truck and left it on December 10. On December 23 I connected via FordPass and remote started the truck, just to see if that would have any effect on the sleep.

The top chart above shows cumulative energy usage in December, so essentially each time the line goes up, that's the truck pulling power. It looks like a pretty distinct change in behavior around December 17, exactly 1 week after the truck was last used. While it does appear to pull more power (in both frequency and total energy) in colder temperatures, it definitely seems to have slowed down after the first week.

I'll be honest, I was somewhat surprised to see how much energy it's used - approximately 70kWh in 17 days, so an average of somewhere around ~4kWh per day. I realize I could have unplugged it and put it in "storage", but I was honestly just intrigued to see what would happen if I left it plugged in.

Another notable point is that it does not appear to have changed behavior 2 weeks after I last used it, which I had expected based on what I had read. Perhaps remote starting it after 13 days was enough to stop that, perhaps something has changed, or perhaps I misunderstood how the deep sleep works. Regardless, I can confirm that it pulled power today, the last refresh in FordPass via Home Assistant was 7 hours ago, and there's nothing in the FordPass app suggesting it's gone to sleep.

It also looks like it is keeping the 12V battery charged:

Screenshot 2025-12-27 at 10.12.07 PM.webp


So anyway, no real question here, but just thought this was interesting as I hadn't seen data from a truck left plugged in for a prolonged period (> 2 weeks) in cold conditions recently.

We traveled away last October and left our 25' Lariot in the garage. I was able to charge/ reach it with Fordpass for solar charging during the day for exactly 72 hours. I've been through this a couple times before. 3 days and it will not charge any longer.

Any suggestions on preventing it from "deep sleep" so quickly (ForScan setting maybe) for next trip?

I purposely run it down to maybe 25% before we leave, and this gives me a place to store all that dandy barn roof solar rather than leave it unharvested.
TY
 
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MattVT

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Any chance you have/can produce the non cummulative graph for the same period ?
That would show each heating / conditioning event more clearly.
Yeah, I’ll need to massage the data a little but will see what I can manage.
 
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MattVT

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We traveled away last October and left our 25' Lariot in the garage. I was able to charge/ reach it with Fordpass for solar charging during the day for exactly 72 hours. I've been through this a couple times before. 3 days and it will not charge any longer.

Any suggestions on preventing it from "deep sleep" so quickly (ForScan setting maybe) for next trip?

I purposely run it down to maybe 25% before we leave, and this gives me a place to store all that dandy barn roof solar rather than leave it unharvested.
TY
I wish I could but I honestly have no idea. I’ve done no ForScan modifications to this truck.

My best guess is that maybe one of the recent OTA updates has subtly changed the sleep behavior.
 

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Looking at the temperature chart would go along with the battery heating. When the rate dropped on the 17th, the temps were warmer. When the temps dropped after Christmas, the power usage went back up.
 

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Thanks for the report.

This is consistent with my observations in below 0-degrees C weather. If my truck is sitting, it'll draw about 2.2kWh at 6-hour intervals over a 24-hour period. It'll break out of that cycle if I happen to drive it that day or if it is a slightly warmer day above 0-degrees C.
 

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This is consistent with what I see here in NW Ontario - yeah we get cold weather here.
A buddy that is interested in getting a Lightning asked me if I park it in the shop during cold weather, especially if I have no plans to go anywhere - but even at 3kWh per day, at ULO rates (3.9 cents) it isn't worth the worry. I just make sure it's plugged in.
 

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I'll be honest, I was somewhat surprised to see how much energy it's used - approximately 70kWh in 17 days, so an average of somewhere around ~4kWh per day. I realize I could have unplugged it and put it in "storage", but I was honestly just intrigued to see what would happen if I left it plugged in.
That's what I've experienced with some testing last winter.

Thanks for the detailed report and charting.
 
 







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