Ev charging range

Discussion in 'Prime Fuel Economy & EV Range' started by glhtp2001, Jul 4, 2020.

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  1. jerrymildred

    jerrymildred Senior Member

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    Not one bit normal. As mentioned before, the estimated range fluctuates wildly based on driving patterns. On short trips of a mile or two, I get about 4-4.5 m/kWh which really reduced range. Same on strips with high speed stop and go. On longer trips at 40-50 mph, I get more like 5.5 m/kWh which gives spectacular EV range. And don't forget that that miserable range the poster complained about was very close to the EPA estimate. Most people get much better than EPA.

    There are things you can do to abuse your battery that really will speed its degradation, though. Things like charging it in hot sun right after a hard drive.
     
  2. Hayman66

    Hayman66 Member

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    I typically get 22- 25 EV. Mine is a 2017 Prime with about 25,000 miles on it.
     
  3. Hayman66

    Hayman66 Member

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    I should add that is what it shows on the guess-o meter. LOL I usually only get 19-22 actual electric miles.
     
  4. pghyndman

    pghyndman Active Member

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    During warmer weather at start up our "guess-o-meter" indicates 32+ miles if the AC is on, turning it off immediately jumps up the predictive mileage to 35.5 range. During winter weather, both this (2020 Ltd) and our 2018 (Premium) would show around 25 miles.
     
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  5. Mark57

    Mark57 2021 Tesla Model 3 LR AWD

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    Normally, that's exactly what I see. This year it's been hot, hot so I've been doing good to get above 29 estimated due to A/C usage. Our dew point has been between 70 and 75 which is sweltering and tough on the A/C.
     
  6. Gokhan

    Gokhan Active Member

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    32 mpg in mixed driving is about right. I get 25–30 mpg on the freeway and 35–40 mpg in city driving. The EPA estimate of 25 mpg is the worst-case scenario for a healthy battery.
     
  7. Salamander_King

    Salamander_King Senior Member

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    25 miles EV range is a good average for people live in cold climate. I get up 30 to 36 miles in summer warm month, but in winter this number get as low as 18 miles. My overall average on my 2017 PRIME was 5.2miles/kWh which translate to ~28miles of EV range from a full charge.
     
  8. Gokhan

    Gokhan Active Member

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    Even a 100 ft difference in height between the origin and destination makes a significant difference in mi ∕ kWh. That's why I only look at the round-trip mi ∕ kWh so that the gravitational energy is not an issue.

    gravitational E (100 ft) = mgh = 3,600 (× 0.4536) × 9.8 × 100 (× 0.3048) = 488 kJ = 488 kW · s = 0.135 kWh

    So, since 50% battery charge is about 3 kWh, 100 ft height change will change your mi ∕ kWh by 4.5% for that amount of kWh use. You can find out the height change for your trip from Google maps.

    1,025 W · h regenerated from gravity would be a (1,025 ∕ 135) × 100 = 760 ft drop in height. That would change your mi ∕ kWh by about 30% for 50% battery use.
     
    #28 Gokhan, Jul 30, 2020
    Last edited: Jul 30, 2020
  9. Hicksite

    Hicksite Junior Member

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    Mpg?
     
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  10. Gokhan

    Gokhan Active Member

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    Not mpg—miles per 100% charge.
     
  11. Hicksite

    Hicksite Junior Member

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    Thought so, thanks!
     
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  12. Richter915

    Richter915 Junior Member

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    Glad I found this thread this has happened to me. Brand new 2017 prime and as I approached 50k this summer there was a huge drop in mileage. For comparison, this July 2020 I averaged 4.5mi/kwh while July of 2019 it was 5.5mi/kwh. Similar numbers for June and it's looking like August will be the same. Absolutely no change in driving style and commute has been the same. I did change my tires but I was noting this difference even before the change.

    I'm definitely finding that unlike in the past, when I accelerate the mi/kwh meter drops rapidly to near zero. It never would drop that low in the past. Further, only if I'm cruising does that bar max out...in the past I was able to go up to 20mph or so before it dropped.

    Other than the tire change everything else is constant, routine oil changes and everything. Any thoughts or ideas would help. I had such pride in my 5.5mi/kwh now I fear I'll never even break 5!
     
  13. Old Bear

    Old Bear Senior Member

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    I had a similar experience a while back and discovered that my Prime had been placed in "Normal mode" rather than "ECO mode." It's something that you might not notice easily on the instrument display because unlike ECO mode and Power mode, no icon is displayed for Normal mode (The background color behind the speedometer appears as blue, green or red depending upon mode. Truly a subtle indicator.)

    See this post and the related thread.
     
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  14. Richter915

    Richter915 Junior Member

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    Thanks for the reply. I checked this morning and I'm fairly certain I've been on Eco this whole time. Just in case I changed it around so that it's set to Eco. I'll see how the mileage goes this week!
     
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