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I want to instal a NEMA 14-50 receptacle for our TESLA visitors. We have 208v. Is there a problem with that?
Paul Toti
Jericho Canyon Vineyard
Calistoga ,CA
If you want to provide 240 V you can install a little transformer. It might be inexpensive (less than $1,000 including socket and installation).
If you are suggesting installing a transformer to plug in to a 208V socket to convert it up to 240V... that won't buy you anything, as power remains a product of the voltage and the current. Thus, if you transform the voltage up, the available current will drop, resulting in the same amount of pwer (wattage) available to the car. (Actually slightly less due to losses).
If you are suggesting replacing the building's line transformer (from a Delta to a Y for instance), that is likely to be FAR more expensive than you suggest...
Well, of course there can be an advantage if done properly.
If we want 40 amps at 250 volts (10kW), then a step up transformer that pulls 50 amps at 208 volts (10.4kW) will do the job, with transformer losses included.
Pretty simple.
There is not a problem with it, and it will save at least one person from the nightmare that is replenishing an empty battery on 110V/12A. Thank you for your generosity.I want to instal a NEMA 14-50 receptacle for our TESLA visitors. We have 208v. Is there a problem with that?
Well, of course there can be an advantage if done properly.
If we want 40 amps at 250 volts (10kW), then a step up transformer that pulls 50 amps at 208 volts (10.4kW) will do the job, with transformer losses included.
Pretty simple.
If you are suggesting installing a transformer to plug in to a 208V socket to convert it up to 240V... that won't buy you anything, as power remains a product of the voltage and the current. Thus, if you transform the voltage up, the available current will drop.
The reason I asked if he was "suggesting installing a transformer to plug in to a 208V socket to convert it up to 240V" is because it's not what you are describing.
Again, power delivered is a constant. Why go to all the trouble of installing a transformer to convert a a 208v/50a circuit to 250v/40a?
Current is drawn, not proffered. You can't change "available current" by doing anything at the source.
Of course if the source is behind a 50A 208V breaker, it will trip before you reach 40A at 240V, but there was no mention of the breaker size on the circuit.