With the CHAdeMO adapter shipping, I decided to try to see how much time it would take to get a charge in an 85 with a CHAdeMO charger.
Many CHAdeMO chargers are limited to 50 kW and 125 Amps. In addition, the Tesla CHAdeMO adapter is limited to 125 Amps. I put this together with Battery charge state vs battery Voltage. Assuming that charge current was limited to 125 Amps or the Supercharger current, whichever is less, I then calculated CHAdeMo charge power and rated mph charge rate.
My raw and not well explained calculations are at Supercharger 2015-02-05 - Google Sheets
Here are some interesting results:
A 50 kW CHAdeMO needs about 56 kW AC in or a breaker (80% continuous load) of 85 Amps, 3-phase, 480 Volts. For locations with only 208 Volts, the need is 200 Amps at 208 with a step up transformer to 480. This is serious power, but within reason.
Given this, and the installed cost of a CHAdeMO Charger being somewhere in the range of $15k to $30k, it may be interesting to consider crowd funding some CHAdeMO chargers on underserved routes where it will be a long time for Tesla to get Superchargers deployed.
Many CHAdeMO chargers are limited to 50 kW and 125 Amps. In addition, the Tesla CHAdeMO adapter is limited to 125 Amps. I put this together with Battery charge state vs battery Voltage. Assuming that charge current was limited to 125 Amps or the Supercharger current, whichever is less, I then calculated CHAdeMo charge power and rated mph charge rate.
My raw and not well explained calculations are at Supercharger 2015-02-05 - Google Sheets
Here are some interesting results:
- Starting charge power at 360 Volts is about 45 kW and 150 mph.
- Max charge rate before the 85 battery current limit kicks in at 393 Volts is 49 kW and 164 mph.
- Time to reach 80% SoC from 0% via CHAdeMO is 1:22
- Tesla claims Supercharger time of 0:40 to reach 80% from 0%.
- On this slightly cold evening, it took me 0:50 to reach 80% from 0% on the Silverthorne Supercharger.
- A 50 kW CHAdeMO only takes an extra 42 minutes over a Supercharger to get to 80% and more, and 32 minutes more than my cool evening example.
A 50 kW CHAdeMO needs about 56 kW AC in or a breaker (80% continuous load) of 85 Amps, 3-phase, 480 Volts. For locations with only 208 Volts, the need is 200 Amps at 208 with a step up transformer to 480. This is serious power, but within reason.
Given this, and the installed cost of a CHAdeMO Charger being somewhere in the range of $15k to $30k, it may be interesting to consider crowd funding some CHAdeMO chargers on underserved routes where it will be a long time for Tesla to get Superchargers deployed.