How long does it take to Charge a Rivian R1T on 120v with the Portable Charger?

[keenanj]

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[Olsonsolar]

I get 2 miles an hour. Max pack battery.

 

[keenanj]

Not bad if you work close to home some people do not need the expense of a l2 charger.

 

[Riviot]

I get 2 miles an hour. Max pack battery.

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[puman00]

I’ve now crossed a year charging on 120v. I work from home, so there have only been two times I needed to head down the road to a fast charger to make sure I could reach my destination

 

[Singletracker]

I tried it once - briefly. I was getting about 2 miles/hour ?? At that rate, it would take about 6 days to go from 0-100% on my large pack R1T. Plan accordingly ?

 

[dradam]

Went to 80% before going To an Airbnb with the R1. 120 V 80 percent to 100% took at least 48h

 

[Cosmacelf]

I’ve now crossed a year charging on 120v. I work from home, so there have only been two times I needed to head down the road to a fast charger to make sure I could reach my destination

So while you can charge on 120V if you don’t drive a lot, be aware that it is more expensive due to charging during expensive time of day, vehicle overhead, and charger inefficiency. See https://carcharging.us/120V.php for more info including a cost calculator at the bottom.

 

[Laserboy1054]

So while you can charge on 120V if you don’t drive a lot, be aware that it is more expensive due to charging during expensive time of day, vehicle overhead, and charger inefficiency. See https://carcharging.us/120V.php for more info including a cost calculator at the bottom.

That's an interesting calculator, thanks for sharing! In my case, the cost of electric energy is the same all the time. So it doesn't matter when I charge, from a cost perspective. However, one reason I got a "smart" charger with WiFi is that my electricity provider is working towards reduced rates at particular times _specifically_ for EV chargers! They'd use the data from my charger to modify the price based on time-of-day. Fingers crossed!

But I was most intrigued by the drop in efficiency of the AC/DC converter when looking at 240 V vs. 120 V. Can someone verify this? The calculator assumes a 85% efficiency at 120 V vs. 95% efficiency at 240 V. I'm prepared to believe it, but that does seem quite a large hit.

 

[Mathme]

I used the Level 1 Charger over Memorial Day for the first time. I was getting about 1.2 MPH on that thing at an Air B&B.

 

[MaskedRacerX]

Keep in mind, using miles/hour to describe charging speed is contingent on your efficiency. Like 2 hours for me at 12a/120v could be 1 mile where it could be 3 miles for you.

If you're using a 15a/120v EVSE ("charger"), then you're getting 80% of the max amps for continuous load, to a 15a, is 12a, then 120 * 12 = 1440/1000 = ~1.4kW

And then (with a caveat below) you can just do the math, i.e., a 100kWh battery at 0% will take 71 hours (100kWh / 1.4kW = ~71h)

But I was most intrigued by the drop in efficiency of the AC/DC converter when looking at 240 V vs. 120 V. Can someone verify this? The calculator assumes a 85% efficiency at 120 V vs. 95% efficiency at 240 V. I'm prepared to believe it, but that does seem quite a large hit.

I've seen this 120 vs. 240 efficiency quoted on other forums (for other EVs), along with some supporting efficiency analysis (some provided via 3rd party apps) and it seems to be pretty much in the ballpark.

On TMC (Tesla) someone was saying that the overhead required when a car is charging is fixed, but as a percent of the overall power being supplied, it's obv. a higher % when the total power in is less (i.e., if standby power requirements when charging is like 0.25kW the car is getting about 80-82% at 12a/120v, but getting like 95-97% at 40a/240).

 

[Laserboy1054]

On TMC (Tesla) someone was saying that the overhead required when a car is charging is fixed, but as a percent of the overall power being supplied, it's obv. a higher % when the total power in is less (i.e., if standby power requirements when charging is like 0.25kW the car is getting about 80-82% at 12a/120v, but getting like 95-97% at 40a/240).

That makes sense. Thanks for the clarification!

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