Phantom power drain 15.7kw - normal?

[iansriv]

My R1 loses about 1% per day of sitting around, which I believe is normal. There are some good suggestions here. All the best.

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[Jiji]

It reports data on the vehicle's state even when not driving, every sleep period, every time it wakes, beginning and end SOCs, etc etc. If it's never sleeping it will show that clearly.

But unless the Rivian API has changed recently you can’t pull any actual energy data, just the SoC to the nearest tenth. I have an app much like EletrriFI and I have seen swings in the SoC after sitting overnight in both directions likely due to some BMS operations.

My guess is the 15kWh is some combination of idle loss, battery conditioning, and change in SoC due to rebalancing. The only data I would reasonably trust would be the Rivian app charge history value or if there was the ability to read the energy from the charger.

 

[Polar]

FWIW The energy measurement is coming from the Sense monitor in our electric panel.

As a fellow Sense owner … I trust that as far as I can throw my Rivian.

Their “intelligence” is shit - and has not improved in the years I’ve owned my sense. I have a 11.5kW charger yet my sense will only ever show 7600W of charging the rest goes to other. When we charge my wife’s Volvo, it never even recognizes that it’s an EV charging and classifies it as other, even though we’re using the same ChargePoint EVSE. The only source I trust for my electricity usage for my charging is the app for my ChargePoint.

Wholistically the sense is good because it does accurately report my solar production and overall import output of electricity, but for individual loads, it should be far more accurate, but it’s not.

 

[SANZC02]

15kwh is 45 miles of range and an insane amount of drain. It would have to be running the AC or heat for that 24 hours.

Are you really getting 3 miles per kWh? I can get that in my Model S but my R1S is closer to 2.2 miles or 33 miles for 15kWh.

If you are getting 3 congrats to you, that would be 390 miles on the large pack.

 

[RivAW]

15kwh is 45 miles of range and an insane amount of drain. It would have to be running the AC or heat for that 24 hours.

It’s unlikely you are getting 45 miles on 15kwh. I haven’t seen anyone post efficiency if

15kwh is 45 miles of range and an insane amount of drain. It would have to be running the AC or heat for that 24 hours.

No it’s not. It’s a lot of “phantom drain”….but it’s not 45 miles….more like 30-35

 

[HaveBlue]

Try going 50-55 mph in LA traffic with a net downhill towards the beach with a dual motor. That was my day today so I guess 3 was stuck in my head over the usual 2.7. either way it's a huge loss of miles via vampire drain for him

 

[majorfriend]

Oh good point… I never thought about it potentially being the charger itself. It’s an older, preexisting 16amp Bosch hardwired EVSE. We have been putting off upgrading until our remodel later this year. I guess I could pretty easily swap the hardwire to a plug and use the Rivian charger.

I think the Rivian unit is hardwired as well... I could be wrong, I'm using a JuiceBox on an outlet. I like having the outlet due to the flexibility it provides. I don't do it often, but it's nice to be able to unplug the charger and plug in a welder.

 

[SPITmadFIRE]

Seems to be about 8-9 miles of range. Will look at percentages moving forward.

9 miles of range would roughly equal 3.6kWh, assuming around 2.5mi/kWh efficiency. That's around 20min of charging at 15kW each day to overcome.

You said your charger hits 15kW when the vehicle is parked long term. That's a momentary power figure. That's normal, assuming your charger isn't drawing that amount of power constantly. How many kWh does the charger use each day when you leave the vehicle parked?

 

[SPITmadFIRE]

15KW is more than sleeping in the car with the ac on for 24 hours would pull.

*taps sign showing the difference between kW and kWh once again*

 

[majorfriend]

9 miles of range would roughly equal 23kWh assuming around 2.5kWh/mi efficiency. That's only an hour and a half of 15kW charging to overcome each day.

You said your charger hits 15kW when the vehicle is parked long term. That's a momentary power figure. That's normal, assuming your charger isn't drawing that amount of power constantly. How many kWh does the charger use each day when you leave the vehicle parked?

I assume he meant kWh, but just a note must of us are getting around 2.5mi/kWh not kWh/mi.

So 23 kWh would be about 57 miles of range. 9 miles of range would be about 3.6kWh

 

[SPITmadFIRE]

...must of us are getting around 2.5mi/kWh not kWh/mi.

Good catch! Did all my math backwards and 9mi of range is even less of a concern when doing it correctly.

 

[ndmiller]

*taps sign showing the difference between kW and kWh once again*

Thanks for sharing Cliff.

 

[MATTELSEWHERE]

Used the ElectriFi site. Actual phantom was 0.43 kWh yesterday (left unplugged). Has to be something else - the charger, what Sense is stating, or it is preconditioning or battery cycling for some reason starting when the truck is programmed to allow charging to start. Thanks for the recommendations everyone.

 

[SPITmadFIRE]

Used the ElectriFi site. Actual phantom was 0.43 kWh yesterday (left unplugged). Has to be something else - the charger, what Sense is stating, or it is preconditioning or battery cycling for some reason starting when the truck is programmed to allow charging to start. Thanks for the recommendations everyone.

I'm still unclear on the original issue. Did the vehicle draw a peak of 15kW from the charger as you originally stated (and if so, for how long), or did it replenish 15kWh from the charger? We have no indication of a problem here if your charger peaked at 15kW to overcome phantom loss because we have no way of knowing how much loss it was overcoming.

 

[nc10]

FWIW The energy measurement is coming from the Sense monitor in our electric panel.

I've not seen reports showing 24 usage from the charger viewpoint, measuring kwhr used by a charger plugged into the truck that didn't need a charge. Would be interesting to see other data points. I will try it this week. It would not surprise me if R1 does some extra things that require more power to maintain a charge state 24/hr/day, but 15kwhr/day seems really high.

- What charge level were you targeting?
- How does the power reported by Sense compare to power company billing. I have a Emporia sensors, not terrible, but not accurate enough that you could use for billing.

When I first got my truck I was loosing 4-5 kwhr/day, based on the level of charge reported by the truck That seemed really high to me. Its gradually improved with updates, now 1 1kwhr / day or less.

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