On my first long trip in my new MY LR. Range is only 2/3 in 48F but the main issue is discrepancy in charge prices between what shows on navigation and what I got charged. Anyone have any clue about this?
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Thanks for the explanation, that makes sense now but still something very different to what I heard about supercharger prices which are usually charged per Kw@chowdarygm The cost for Supercharging at that station is based upon the power level being delivered at any moment in time. The highest cost, $1.15/min, happens when you first plug in as your battery's state-of-charge is the lowest. At that time you may be pulling 200kW of power so you get charged (monetarily) at the $1.15/min rate. As you continue to charge, the power level will gradually decrease and then you'll fall into the other rates; <180kW, <100kW, and finally at the very end of the charging session, <60kW.
What's listed as your charging fees in both the Tesla's navigation display and from within the Tesla app, show identical costs / min. If you multiply the times at each given rate (e.g., 5 mins x $0.22 = $1.10) you should see everything works out. The session times all appear to be rounded to the nearest minute so that might be where the error is in total power delivered to the vehicle. Some of it can also be due to the inherent charging losses as not all of the energy being delivered by the Supercharger gets into the HV battery.
The app probably should show each cost-of-charging-time in chronological order, not by cost rate. In other words, the $1.15/rate should be displayed first in the list as that is what's happening during the charging session; the highest cost/min is at the start of charging and the lowest cost/min is at the end.
Colder temps do reduce range and higher speed reduces it also. Getting 2/3 rated range driving I94 at the speed limit in 45 degrees sounds about right. Fortunately there are now several superchargers between Madison and the Twin cities so it’s an easy route even when it’s much colder.Is it normal for the battery range goes down to almost 2/3 when the temperatures are about 45F? I preconditioned the battery before leaving home.
Be mindful of the distinction between kilowatts (kw) and kilowatt-hours (kWh).Thanks for the explanation, that makes sense now but still something very different to what I heard about supercharger prices which are usually charged per Kw
$0.55/kWh would be very high for the Midwest but I don't think we know how many kWh were actually delivered. It appears the app is mistakenly reporting minutes billed instead of kWh delivered.Doing the math on your first charge in Lake Delton, you paid about $0.55 per kWh average for the session. That’s up there but not far off from typical rates (at least here in CA).
yeah that’s a weird goof, but looks like you’re right. It adds up in all the screen shots shared so far.It appears the app is mistakenly reporting minutes billed instead of kWh delivered.
If I'm doing the math right (no guarantees there) there's no way the total power delivered should be less than 34 kWh.
Minor comment on this. You know that Monroney sticker? The one that's on the car when one buys it and reports on the W-hr/mile? I was surprised to find out last month that the amount of energy per mile is based upon the energy delivered to the car from the charger. Not what the car self-reports.FWIW I got similar numbers assuming a very pessimistic charging curve:
(5 minutes * 5kw) + (12 minutes * 60kw) + (8 minutes * 100kw) + (3 minutes * 180kw) = 35kwh
But we're both ignoring losses. Power into the vehicle != energy getting stored in the battery. There's various sources of loss:
- Resistance in the battery and in-car wiring. Some of the energy delivered by the charger directly turns into heat (that's in part why the battery typically reaches around 60 deg C while charging!)
- Power to run the heating and HVAC systems to heat up the battery (consumes 5-6kw) (toward the beginning of the charging session)
- Power to cool the battery (toward the end of the charging session)
FWIW I got similar numbers assuming a very pessimistic charging curve:
(5 minutes * 5kw) + (12 minutes * 60kw) + (8 minutes * 100kw) + (3 minutes * 180kw) = 35kwh
But we're both ignoring losses. Power into the vehicle != energy getting stored in the battery. There's various sources of loss:
- Resistance in the battery and in-car wiring. Some of the energy delivered by the charger directly turns into heat (that's in part why the battery typically reaches around 60 deg C while charging!)
- Power to run the heating and HVAC systems to heat up the battery (consumes 5-6kw) (toward the beginning of the charging session)
- Power to cool the battery (toward the end of the charging session)
aren’t you charged for energy delivered by the charger not how much ends up in the battery?
The app shows Energy Delivered which doesn't include the losses.
The energy delivered is unexectedly low, because that wasn't the energy delivered... It is a bug as @threeputts noted. Notice how all three of the screenshots posted so far are X KWh hour delivered and then the charging time is always one minute more... It is basically reporting the charging time in both spots instead of telling you the actual delivered energy.I'm trying to potentially explain why the Energy Delivered is unexpectedly low.