interesting. I don’t understand how the figure 8 could make a difference. Can you explain?This. Also make sure it is not coiled on the ground. If you must coil/wind the cord while on the ground during charging, use a figure 8 pattern. This will greatly reduce the resistance and lead to lower temperatures and safer charging.
In a coil the heat dissipation is greatly reduced. The resistance increases with elevated temperature. An issue may arise due to the ineffectiveness of convection when air can't reach the inner loops of the cable. The figure 8 assists in heat dissipation. Not perfect, just better.
40 amp break = 32 amp charge rate just FYI…not the full 40 amps due to continuous load rating of breaker/wire.
Yep. I sized my circuit for 60amp load hoping to increase as tech increases. Our Tesla pulls more amperage so figured might as well pull the same wire for the Porsche.
Continuous load devices need a circuit rated for 20% higher. Hence the 50amp circuit for a 40amp load. 40amp circuit for a 32 amp load.
Ok, so now I'm confused. I currently have a 40 amp breaker and a 14-30 plug. The Porsche charger display says "24 A". As soon as I receive the ordered 14-50 plug/cable the electrician will be replace the 40 amp breaker with a 50 amp breaker. The wire is the right gauge because I thought the car came with the 14-50 plug (dealer screwed up) and that's what the electrician installed a few days before taking delivery.
A 14-30 plug is rated for 30 amps and the wire should also be at least 30 amps and the breaker should be no more than 30 amps as it is supposed to protect the receptacle and the wire. I guess the charger knows that it is being ran on a 14-30 and thus only pulls 24 amps. When you get the 14-50 receptacle and charger cord it should be pulling 40 amps.
You can run a bigger breaker if the wire is rated higher. You cannot run a bigger breaker on smaller wire. The breaker doesn’t have to match the outlet. For example, I ran a 60 amp circuit with 60 amp breaker but have a 14-50 outlet.
So are you saying the 40 amp breaker is too much (hot) for the receptacle that the 14-30 is plugged into? should be a 30 amp breaker instead?
I think it's much more important that the wire be rated at or over the breaker. but an electrician told me that the breaker was intended to protect both the wire and the receptacles. So for my shop where I wanted a 20 amp circuit we had to find 20 amp rated receptacles.So are you saying the 40 amp breaker is too much (hot) for the receptacle that the 14-30 is plugged into? should be a 30 amp breaker instead?
Is there an electrician “in the house”?
Correct! US code requires the breaker to be no larger than the lowest-rated part of the circuit, including the receptacle (socket).
