Please evaluate my charging speed

[R1S88]

I took delivery last week. I had the Rivian wall charger hardwired 40A current and it looks like the truck is pulling 34 amps. Is my 7kw and 13 miles per hour of charging (sport mode) low? I was expecting double the speed, but I am new to this. Thanks.

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[jjswan33]

Its correct. 40A circuit should pull a max of 32A. 32A * 240V = 7.68 kW.

 

[R1S88]

Thanks for the quick and helpful answer. Should I get my electrician to rewire from 8 AWG to 6 AWG so that I can increase to 48A current? Is the improvement linear? It would not be cheap as I live in a condominium.

 

[kurtlikevonnegut]

I took delivery last week. I had the Rivian wall charger hardwired 40A current and it looks like the truck is pulling 34 amps. Is my 7kw and 13 miles per hour of charging (sport mode) low? I was expecting double the speed, but I am new to this. Thanks.

To get the 25 mi/hr at the max 11.5kwh you need to be hardwired on a 60a circuit.

 

[R1S88]

Yes, it would be 60A circuit with 48A current 6 AWG, which I believe are the defaults for the Rivian Wall Charger with the 3 dip switches in the on mode.

 

[jjswan33]

Thanks for the quick and helpful answer. Should I get my electrician to rewire from 8 AWG to 6 AWG so that I can increase to 48A current? Is the improvement linear? It would not be cheap as I live in a condominium.

40A circuit - 32A * 240V = 7.68kW
50A circuit - 40A * 240V = 9.6kW (25% > than 40A circuit)
60A circuit - 48A * 240V = 11.5kW (~50% >than 40A circuit, 20% > than 50A)

 

[R1S88]

That's helpful info - thanks. Do you have an idea of what capacity most people have wired in their homes? I will do a search later.

I guess it's the difference of being able to do a full charge overnight vs it taking ~ 18 hours. I mostly plan to charge to 70% but will occasionally need a full charge.

 

[jphillips97]

Thanks for the quick and helpful answer. Should I get my electrician to rewire from 8 AWG to 6 AWG so that I can increase to 48A current? Is the improvement linear? It would not be cheap as I live in a condominium.

How many miles a day do you drive? Overnight charging at 13 miles per hours is still over 100 miles per day..... Do you need more?

 

[kurtlikevonnegut]

That's helpful info - thanks. Do you have an idea of what capacity most people have wired in their homes? I will do a search later.

I guess it's the difference of being able to do a full charge overnight vs it taking ~ 18 hours. I mostly plan to charge to 70% but will occasionally need a full charge.

Keep in mind that you are only replacing what you use, not 0-70 every day (unless you drive 200+ miles a day). I currently have a NEMA 14-50 that I use the mobile charger with every night, but I have the amperage ramped down to 24 to reduce load and only charge from 11p-8am and I'm at 70% every day. That's with a 70mi daily commute plus random other driving. If I need more juice for a longer trip, I can easily still get what I need with just a minimal amount of planning.

Having the 60a hardwired is nice, and safer if done correctly, but you certainly don't need that extra charging speed outside of very specific use cases.

 

[bholliday5150]

I had my charger hardwired for the specs Rivian suggested for full charger potential. I get 11+ Kwh on my charger. It adds about 22 to 25 mph. Pricey because I had to upgrade to 200amp service on my 1960's house but well worth it for the house and the charger.

Plus in Illinois my electric company Ameren pays you in credit if you charge between 11pm and 7am. Last month it cost me -$15.00 to charge for the month on Ameren(Delivery) side of bill. I put in 1000 Kwh over the month to the truck only charging during that time. The 1000 Kwh cost me .04 cents an hour on supply side equal to $40. $25 to charge a whole month and get 1000 kwh of power is a pretty good deal.

 

[LTD in CBTS]

That's helpful info - thanks. Do you have an idea of what capacity most people have wired in their homes? I will do a search later.

I guess it's the difference of being able to do a full charge overnight vs it taking ~ 18 hours. I mostly plan to charge to 70% but will occasionally need a full charge.

I have a Tesla wall charger on a dedicated 60 Amp circuit. It adds about 22 miles/hour to my R1T set to All Purpose mode. Charge from midnight to 6am here in SoCal when rates are cheapest.

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