Why the BMW i3-REx

Discussion in 'EV (Electric Vehicle) Discussion' started by bwilson4web, May 15, 2016.

  1. bwilson4web

    bwilson4web i3 and Prime

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    2017 Prius Prime
    Model:
    Prime Plus
    Introduction

    Having found the ShorePower, truck electrical stations midway between Huntsville AL and Nashville TN, I decided to do an all electric, round trip to measure times, distances, and costs.

    Huntsville To Nashville And Back
    • Arrive Tennessean Truck Stop - 6:37 to 7:39, started with 70 miles EV indicated at 100% SOC. Tripmeter reports 1:02 hr, 55 mi, average speed 54.0 mph. Connected to ShorePower getting 212VAC @30A, 6.36 kW but though power was on, took about two minutes to contact activation service for 2 hour charge, $3. Had breakfast and used excellent WiFi to plan Nashville destination, Green Hill YMCA, in Nashville. Found a data plate: Model TSE-4, Part: SP-0585-R02, 120/240 VAC, 102 Am NEMA 3Rm Wire Size: 4awg to 3/0, Intertek.
    • Arrive Green Hills YMCA EVgo - 9:43 to 10:48, left with 81%, 62 mi indicated. Arrived 13.5% with 11 mi indicated. Total distance 115 mi, 2:08 hr, 55.1 mph, 4.3 mi/kWh. Connected to EVgo which reported: 45 min and 8 seconds, 17.07 kWh, cost $15.75 at 11:36. I returned to charging station at 12:10 AM not realizing the charging session had ended. The e-mail notification was OK but an iPhone SMS text would have been more useful. Had a Lox cream cheese, toasted bagel for lunch.
    • Arrive Tennessean Truck Stop - 11:58 to 13:04, left with 96.5%, 69 mi indicated. 1:05 h duration, 60 mi, 3.9 mi/kWh, 56.8 mph. Arrived 12.5%, 9 mi indicated. Connected to ShorePower which was still hot without calling the enable service. Had a bowl of soup and set destination for the HSV fast DC charger. Left with 71% and 59 mi indicated to map distance of 49 mi.
    • Arrive HSV Fast DC charger - 14:55 to 15:57, ICE started 30 yards from charger, 6% and 6 mi indicated. Started charger and paid $0.25 parking meter fee.
    • Arrived home 17:14.
    Lessons Learned
    • The phantom charge is misleading. The last 91-100% charge does not have the same kWh of energy per percent as the lower percentages. This makes sense as the current falls off above 88% so it makes sense we are not storing the same kWh as before. So even though I left with an indicated 10 mile pad, I arrived at the HSV Fast DC charger at the threshold that just started the ICE. I stopped it in about ~10 seconds as I parked.
    • It appears ShorePower activation is 'honor system' at the Tennessean Truck Stop. I had to turn on the NEMA 14-50 circuit breaker but it was never turned off by their activation service.
    • Every hour of driving is ~2 hours of L2 charging at 208-210 VAC at 30 A. In contrast, a fast DC charger takes about 45 minutes. However, both suffer from a higher indicated charge in the 91-100% SOC level that does not have the same kWh energy level as the 81-90%. What this means is a detour to a fast DC charger needs to be less than an hour or you might as well use a full-power, L2 charger.
    • EV costs were $3, $15.75, and $0.25, for a total of $19.00. Had I driven on gas, it would have cost ~$12 and saved nearly 5 hours of charging. The total trip time was ~11 hours for both driving and charging.
    Bob Wilson
     
    #581 bwilson4web, Feb 12, 2019 at 4:17 AM
    Last edited: Feb 12, 2019 at 4:23 AM
    cwerdna likes this.
  2. bwilson4web

    bwilson4web i3 and Prime

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    2017 Prius Prime
    Model:
    Prime Plus
    Now I can compare and contrast two routes, driving EV only, between Huntsville and Nashville:

    [​IMG][​IMG]

    Via direct route, 30A, 208VAC, L2: (GOOD, CHEAP)
    • Shortest distance, -30 mi., 114 mi
    • Cheapest charging, $3 (or honor system)
    • Longest time, +20 min, total 4hr 5 min
    Via detour to fast charger: (GOOD, FAST)
    • Longest distance, +30 mi., 143 mi
    • Most expensive, $12
    • Shortest time, -20 min, total 3hr 46 min
    Via direct route, REx: (FAST, CHEAP)
    • Shortest distance, 114 mi
    • Medium cost, $6, 2.3 gal
    • Shortest time, -1hr 40 min, total 2hr 5 min
    Bob Wilson

    ps. GOOD, FAST, CHEAP - pick two
     
    #582 bwilson4web, Feb 12, 2019 at 5:57 AM
    Last edited: Feb 12, 2019 at 6:13 AM
  3. el Crucero

    el Crucero Senior Member

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    Vehicle:
    2012 Prius Plug-in
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    Plug-in Advanced
    Now, let's do that trip in my Tesla model 3MR with an "all out" range of 264 miles


    Huntsville 100%
    Nashville 56% 01:54 112 miles
    Huntsville 11% 01:57 112 miles

    253 Wh/mi
    total cost = $0.00 (i3 = ~$19.00, ICE = ~$12.00)
    time = 03:52 (i3 = ~11 hours, ICE = ~ 7 hours)
    total distance = 224 miles


    I picked all three, GOOD, FAST, CHEAP
     
    #583 el Crucero, Feb 12, 2019 at 10:49 AM
    Last edited: Feb 12, 2019 at 11:24 AM
  4. SAronian

    SAronian Active Member

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    Thank Bob,

    The best of many variables. Hoping 2019 offers a ramp up in fast DC locations.
     
  5. bwilson4web

    bwilson4web i3 and Prime

    Joined:
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    Location:
    Huntsville AL with 2014 BMW i3-REx
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Plus
    I've noticed that when plugged in to a charger, the heater no longer blows warm air. However, enabling pre-conditioning does blow warm air while on charger. But then comes the question of when, especially if traveling.

    As an experiment, I waited until the L2 charging current reached ~16A, about 50% of the normal 32A rate:
    [​IMG]
    The preconditioning load draws more current to heat the cabin. But this only brings the load up to the maximum the car can take. After a brief return to peak power, it ramps down but shares the load with battery charging. In effect, we are thermally charging the cabin while the battery charging ramps down.

    Bob Wilson