timbop
Well-Known Member
- First Name
- Tim
- Joined
- Jan 3, 2020
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- Location
- New Jersey
- Vehicles
- Solar powered 2021 MME ER RWD & 2022 Corsair PHEV
- Occupation
- Software Engineer
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- #1
I'm trying to figure out realistic range with a Mach-E standard range with both RWD and AWD configurations. It is clear that the simple single number from either EPA or WLTP calculations doesn't really help given the massive variability in EV performance based on use and conditions. It seems like the best approach is to take the range in "best case city driving in moderate weather" and apply adjustments to that to suit the situation - with the adjustments being multiplied together to get a final range number. I've already done a thread asking about "penalties" for cold, hot, and highway driving - but perhaps some of you could check my math for me?
Assumptions:
Given those assumptions, the adjustment factors suggested by others:
Since those factors can be combined, the expected ranges per situation:
Does that make sense and are those factors reasonable, or do I have too much free time? Clearly the "best case" city/hwy EPA driving numbers will be different, but is the logic sound and are the factors mentioned all that have to be considered?
Assumptions:
- best-case city driving should be about 10% better than the projected EPA rating
- Ford is probably going to reserve 10% of the battery as buffer
- Even with the buffer, one should not charge to more than 85% every day nor drop below 10% to protect battery longevity. Since winter affects range most, charge to 85% in the winter and 80% the other months.
- Based on the target numbers available today, the Mach E AWD has best case range of around 230 miles (10% better than projected EPA), and the RWD a range of around 255 miles
Given those assumptions, the adjustment factors suggested by others:
- 100% highway driving = .75
- 50% highway driving = .875
- summer driving (A/C and battery cooling) = .9
- winter driving (heat and battery inefficiency) = .65
Since those factors can be combined, the expected ranges per situation:
- RWD 100% highway driving in summer: 255 * .9 * .75 = 172 mi max, recommended range = 120 miles (charged to 80% and recharge at 10%)
- RWD 50% highway driving in winter: 255 * .875 * .65 = 145 mi max, recommended range = 108 miles (charged to 85%, and recharged at 10%)
- AWD 50% highway driving in spring/fall: 230 * .875 = 201 mi max, recommended range = 140 miles (charged to 80%, and recharge at 10%)
Does that make sense and are those factors reasonable, or do I have too much free time? Clearly the "best case" city/hwy EPA driving numbers will be different, but is the logic sound and are the factors mentioned all that have to be considered?
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