30 amp breaker

[lachambers]

I have a 30 amp breaker for my dryer with a NEMA 14-50 Outlet. How fast will that charge a MY?

 

[RedTesY]

30 amps X 240 volts = 7,200 watts, or 7.2 kilowatts (kW). Assuming your Model Y uses about 280 watt hours/mile (like mine), this outlet would charge at about 26 miles of range per hour.

 

[MorrisonHiker]

I have a 30 amp breaker for my dryer with a NEMA 14-50 Outlet. How fast will that charge a MY?

Hopefully you have a 14-30 outlet if you have a 30 amp breaker.

30 amps X 240 volts = 7,200 watts, or 7.2 kilowatts (kW). Assuming your Model Y uses about 280 watt hours/mile (like mine), this outlet would charge at about 26 miles of range per hour.

For EVs (continuous load), you can only use 80%, so it would be 24 amps usable, not 30 amps.

A 2021 Model Y LR is rated at 270 Wh/mile: 24 amps * 240 volts / 270 Wh/mile = 21.3 mph.

A 2021 Model Y Performance is rated at 300 Wh/mile: 24 amps * 240 volts / 300 Wh/mile = 19.2 mph.

 

[lachambers]

Hopefully you have a 14-30 outlet if you have a 30 amp breaker.

For EVs (continuous load), you can only use 80%, so it would be 24 amps usable, not 30 amps.

A 2021 Model Y LR is rated at 270 Wh/mile: 24 amps * 240 volts / 270 Wh/mile = 21.3 mph.

A 2021 Model Y Performance is rated at 300 Wh/mile: 24 amps * 240 volts / 300 Wh/mile = 19.2 mph.

Thank you morrisonHiker

 

[MD-2000]

Yes - a portable charger with the 14-50 will try to draw 32A. (it's max capable). that should pop the breaker. Get a 14-30 plug for your portable charger, or on your car's charging options limit it to 24A. (And check that regularly to be sure the car has not decided to reset itself...) But only as a stop-gap. Get the correct plug and it will limit the charger's draw.

Electrical code says "DO NOT DRAW MORE THAN 80% OF RATED CIRCUIT/BREAKER AS A CONTINUOUS LOAD" As MorrisonHiker says.

I have a Gen2 charger and got a 50A cord 14-50 from Amazon, so I could plug it in instead of hard wiring. But the Gen2 Wall Charger has a dial to set max current limit.