Rivian Wall Charger inefficiency

[bd5400]

Looks like two different charging sessions... One was 15 hours long and the other was 5 hours long.... Also it is not kW, it is kWh.... One is a measure of power (rate of energy flow) and one is a measure of energy.......

The app view for the charger measures charging sessions as total time plugged in, not the time actually spent charging.

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[pc500]

Looks like 1kW didn't go to the battery... not 5kW.

The electricity draw measured by the wall charger is likely what is dispensed to the actual charger in the vehicle. It has some efficiency loss and this is relatively normal. I suspect the vehicle screen only actually displays the losses downstream of the DC voltage conversion.

 

[Dirty_B]

You are seeing the loss converting from 240V AC to ~360V DC where the efficiency is the kWh delivered to the battery (energy added) divided by the kWh measured at the charger (energy used) times 100. There are other small resistive losses but AC to DC conversion is the big one.

About 10% percent is pretty common, here is a snapshot of the past months charging sessions on my Mustang Mach-E with the session details on one:

Oh hell, I know Skaneateles! How is Doug, damn I miss his fish!!! My mouth is watering just thinking about it!

 

[joelster]

Has anyone see and more importantly know how to correct this charging issue with the Rivian Charger. It seems to waste approximately 5kw of power per charge. This coupled with all of the Vampire Drain makes for a very inefficient vehicle to own.

Does it though?

Let's see. Assuming these charging session numbers are correct (and I'm not so sure they are) it's 5kWh x $0.138/kWh*. So 68 cents worth of power lost in this charging session. Ten miles maybe. ¯\_(ツ)_/¯

What does ten miles cost in an ICE truck these days?

*This is the number I am currently using to calculate home charging costs. Your 'mileage' may vary.

 

[joelster]

In Washington State we pay less than $0.11 a kilowatt hour where I live.

Yeah. In. Portland we pay 6 or 7 cents/kWh but when you take your bill and add up all of the fees and taxes and divide by total kWh, you get $0.138. This number actually came from PGE. I will be looking closer at my power bills now that I actually have the charger installed.

 

[pc500]

Yeah. In. Portland we pay 6 or 7 cents/kWh but when you take your bill and add up all of the fees and taxes and divide by total kWh, you get $0.138. This number actually came from PGE. I will be looking closer at my power bills now that I actually have the charger installed.

As you're not going to disconnect electricity over it, you'll want to look at your variable cost for consuming one additional kilowatt hour.

 

[joelster]

As you're not going to disconnect electricity over it, you'll want to look at your variable cost for consuming one additional kilowatt hour.

Yeah... So the power is 6.328 cents/kWh but there are also other fees that are charged per kWh.

OK... Looking at my last bill. If I ignore the basic charge (flat fee) and add up all the fees and credits that are calculated per kWh, I get 13.4 cents/kWh.

Am I thinking about this wrong?

 

[zipzag]

National average is 18 cents. If you care in Cali you probably know what you pay. I don't understand how electricity prices got so high in either California or Australia.

In Chicago we have a time of use variable pricing available which is usually cheap overnight. Northen Illinois is mostly nuclear power, and those plants can't be throttled during low demand.

The rate you pay is after transmission and taxes are include. My overnight electricity cost is sometimes negative, but it still costs 7 or 8 cents.

 

[Dan_Foothill]

National average is 18 cents. If you care in Cali you probably know what you pay. I don't understand how electricity prices got so high in either California or Australia.

In Chicago we have a time of use variable pricing available which is usually cheap overnight. Northen Illinois is mostly nuclear power, and those plants can't be throttled during low demand.

The rate you pay is after transmission and taxes are include. My overnight electricity cost is sometimes negative, but it still costs 7 or 8 cents.

Yeah in SoCal Edison: $0.18/kw is the cheapest for off peak (10pm-8AM). my peak during the summer is $0.78/kw (2pm-8pm)

 

[AdamsFan1983]

Oh hell, I know Skaneateles! How is Doug, damn I miss his fish!!! My mouth is watering just thinking about it!

#truth. Some of the best seafood around.

 

[zipzag]

Yeah in SoCal Edison: $0.18/kw is the cheapest for off peak (10pm-8AM). my peak during the summer is $0.78/kw (2pm-8pm)

How much does public charging cost in Orange County?

 

[Dan_Foothill]

How much does public charging cost in Orange County?

Level II is ~$.30/kw. DC is $.45kw

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