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I wanted to know how much HV battery charge is lost while parked.
Theory: The HV battery would self discharge at a more or less constant rate, and we would know what to expect; via a formula; while parked for long intervals.
I used an OBDII reader, a ScanGaugeIII to read and manually record the truck's reported state of charge when parking for the night (key just removed) to key just inserted (truck woken up but not started).
13 parking events recorded.
I tried to find a formula by normalizing the data to % lost per hour parked. This is because the longest I parked was 31 hours 40 min (#3) and the shortest I parked was 3 hours 25 min (#5).
In general, I noted the following.
Green bars are short parking events of less than 6 hours.
Red Bars are long parking events, usually overnight, usually 12, 13, 14 hours.
Blue bars were outliers that didn't fit the pattern. #6 was 5 hours parked. #8 was 4 hours parked.
What it "looks like" is, in general, most HV battery charge is lost in the first few hours of being parked. Then it tapers off.
In general, over all events, charge loss was 0.275% per hour. But the longer it sits, this rate goes down.
On parking events longer than 12 hours, the rate of discharge was 0.10 percent per hour.
Small enough not to worry the daily driver. But that's 2.4% per day.
Ford says "start the truck" every 15 days. So this jives with that recommendation.
The HV battery is programmed to stay between 30% and 70%.
If you park close to 30% before your long trip, you could be screwed at 15 days. Parking at 70% buys you more time.
My recommendation: run the truck for 5 minutes to top it off before that long airplane trip.
Enjoy the ride!
Theory: The HV battery would self discharge at a more or less constant rate, and we would know what to expect; via a formula; while parked for long intervals.
I used an OBDII reader, a ScanGaugeIII to read and manually record the truck's reported state of charge when parking for the night (key just removed) to key just inserted (truck woken up but not started).
13 parking events recorded.
I tried to find a formula by normalizing the data to % lost per hour parked. This is because the longest I parked was 31 hours 40 min (#3) and the shortest I parked was 3 hours 25 min (#5).
In general, I noted the following.
Green bars are short parking events of less than 6 hours.
Red Bars are long parking events, usually overnight, usually 12, 13, 14 hours.
Blue bars were outliers that didn't fit the pattern. #6 was 5 hours parked. #8 was 4 hours parked.
What it "looks like" is, in general, most HV battery charge is lost in the first few hours of being parked. Then it tapers off.
In general, over all events, charge loss was 0.275% per hour. But the longer it sits, this rate goes down.
On parking events longer than 12 hours, the rate of discharge was 0.10 percent per hour.
Small enough not to worry the daily driver. But that's 2.4% per day.
Ford says "start the truck" every 15 days. So this jives with that recommendation.
The HV battery is programmed to stay between 30% and 70%.
If you park close to 30% before your long trip, you could be screwed at 15 days. Parking at 70% buys you more time.
My recommendation: run the truck for 5 minutes to top it off before that long airplane trip.
Enjoy the ride!
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