Charging Cost

[Lennoxr]

Naples Fl and Ocala Fl $.30/kWh

Tifton, Ga and Atlanta, Ga. two charging rates in one session.
$.12/ minute Low
$.24/ minute high

Anyone analyzed the cost per kWh in the per minute rates vs the per kWh billing summary?

 

[Lennoxr]

Naples Fl and Ocala Fl $.30/kWh

Tifton, Ga and Atlanta, Ga. two charging rates in one session.
$.12/ minute Low
$.24/ minute high

Anyone analyzed the cost per kWh in the per minute rates vs the per kWh billing summary?

 

[ATPMSD]

Might want to check out this page

Supercharger Support

Learn more about Tesla Superchargers, including best practices, charging rates, payment methods and locating a Supercharger when you're on the road.

www.tesla.com

 

[laceyboy]

I would prefer the cost per kWh over per minute since you know how much to fill whole pack while per minute you don't.
It's a bit difficult to compare these 2 costs. Per minute depends on charging rates, efficiency.
If you are charging at lowest rate of upper tier, you loosing money comparing to charging at highest rate of lower tier.

 

[Watts_Up]

The rate of charging is not linear so it is not easier to make a direct conversion between time and cost.

Basically if you added 24 kWh in your battery, it would cost you $7.20 (at $0.30 / kWh), and

- if the average charging speed is 24 kWh it will you take you 60 minutes and you will have spent $7.20 (for a $0.12 connection rate by minute), or
- if the average charging speed is 48 kWh it will you take you 30 minutes and you will have spent $7.20 (for a $0.24 rconnection ate by minute).

So if the average rate of charging is faster that 24 kWh (for low rate) or 48 kWh (for high rate) your are a winner !!!



An other way to look at is to use an hypothetical charging rate:

- For 6 minutes, if the charging rate is 100 kWh, this will add 10 kWh and it would cost you $3.00 (at $.30 / kWh) or $0.72 (at $.12 / mn) or $1.44 (at $.24 / mn)
- For next 6 mn, if the charging rate is _75 kWh, this will add 7.5 kWh and it would cost you $2.25 (at $.30 / kwh) or $0.72 (at $.12 / mn) or $1.44 (at $.24 / mn)

So after 12 mn, this will add 17.5 kWh and it would cost you $5.25 (at $.30 / kWh) or $1.44 (at $.12 / mn) or $2.88 (at $.24 / mn)

- For next 6 mn, if the charging rate is 50 kWh, this will add 5 kWh and it would cost you $1.50 (at $.30 / kwh) or $0.72 (at $.12 / mn) or $1.44 (at $.24 / mn)

So after 18 mn, this will add 22.5 kWh (avareage speed 75 kWh) and it would cost you $6.75 (at $.30 / kWh) or $2.16 (at $.12 / mn) or $4.32 (at $.24 / mn)

Note: I might be wrong in my quick calculation, correct me if needed...

 

[Darblish]

At 60kW (the cap for tier 1), you’ll get 1kWh in 1 minute. Using the listed prices in the OP, you’d pay 30¢ for that energy paying by unit, or 12¢ paying by time. If the charge rate increased very slightly to put you in the higher tier, that same 1kWh would cost you 30¢ by unit, or some fraction less than 24¢ by time.

As charging speed increases, paying by time seems to become even more of a bargain. At a 250kW supercharger (and assuming for this example that you’re getting full speed), a minute of charging would net you 4.16kWh. That would cost $1.25 by unit, or still 24¢ by time. I don’t know if there are even any V3 superchargers in pay-by-time areas, or whether the prices are raised accordingly, though.

 

[jsight]

Good analysis. I've basically always found Tesla's per minute pricing to be lower than the per kwh rate. Sometimes it is even less expensive than home charging.

As two examples, I recently went from 29% to 90% in Brunswick with an average charge rate of 87 kw. It cost $6.24 for ~45kwh.

I had a similar charge in FL that was a per kwh of 13 to 92%, 57kwh. It was $17.40.

Having said that, I get the feeling that per minute rates are becoming less common. I think South Carolina recently switched to $/kwh.

 

[jsight]

As charging speed increases, paying by time seems to become even more of a bargain. At a 250kW supercharger (and assuming for this example that you’re getting full speed), a minute of charging would net you 4.16kWh. That would cost $1.25 by unit, or still 24¢ by time. I don’t know if there are even any V3 superchargers in pay-by-time areas, or whether the prices are raised accordingly, though.

There definitely have been some. The ones in South Carolina used to be a bargain, and the Brunswick, GA example was a per minute V3 as well.

I get the feeling that these will become more rare, though. I think Tesla is actively working on getting to $/kwh.