>At 40 A over a wire run of 5 m for 9 hours, total energy lost over the wire run for a 300-mile full charge is:
>for AWG#6: (40 A)^2 x (5 m x 1.296 mΩ/m) x 9 hr = 0.093 kWh
>for AWG#5: (40 A)^2 x (5 m x 1.028 mΩ/m) x 9 hr = 0.074 kWh
>for AWG#4: (40 A)^2 x (5 m x 0.8125 mΩ/m) x 9 hr = 0.059 kWh
I do have to wonder - 0.093kWh would cost me 8/10 cent or maybe 25 cents a month. The problem then is only the heat issue.
I was told code was 40A/8Ga and 50A/6Ga, that is 40A breaker and 50A breaker. *Then* you figure that code also says never draw continuously for extended periods more than 80% of max Amperage - so 32A or 40A respectively. I have a 50A circuit and my Wall Charger (gen2) is set to 40A max.
Considering the possible outcomes, why bother pushing the limits? If you have 8Ga, limit your charging to 32A/240V. If you schedule charging for 1AM, odds are you will be fully charged in the morning or the morning after, unless you consistently go very long distances - if you do that, spend the money for a thicker cable.
By the way, I use this:
General Electric WX09X10037 4-Feet 50-Amp 4 Wire Range Cord
https://www.amazon.ca/gp/product/B00LQDFOMY
I have this connected to my wall charger, so I can keep my 14-50 socket in the garage. This works well, this cable never even gets warm to the touch. BTW, the charger only uses ground, red and black, the white is capped off. Interestingly in this product, ground and white is 8Ga and red and black are 6Ga.
>for AWG#6: (40 A)^2 x (5 m x 1.296 mΩ/m) x 9 hr = 0.093 kWh
>for AWG#5: (40 A)^2 x (5 m x 1.028 mΩ/m) x 9 hr = 0.074 kWh
>for AWG#4: (40 A)^2 x (5 m x 0.8125 mΩ/m) x 9 hr = 0.059 kWh
I do have to wonder - 0.093kWh would cost me 8/10 cent or maybe 25 cents a month. The problem then is only the heat issue.
I was told code was 40A/8Ga and 50A/6Ga, that is 40A breaker and 50A breaker. *Then* you figure that code also says never draw continuously for extended periods more than 80% of max Amperage - so 32A or 40A respectively. I have a 50A circuit and my Wall Charger (gen2) is set to 40A max.
Considering the possible outcomes, why bother pushing the limits? If you have 8Ga, limit your charging to 32A/240V. If you schedule charging for 1AM, odds are you will be fully charged in the morning or the morning after, unless you consistently go very long distances - if you do that, spend the money for a thicker cable.
By the way, I use this:
General Electric WX09X10037 4-Feet 50-Amp 4 Wire Range Cord
https://www.amazon.ca/gp/product/B00LQDFOMY
I have this connected to my wall charger, so I can keep my 14-50 socket in the garage. This works well, this cable never even gets warm to the touch. BTW, the charger only uses ground, red and black, the white is capped off. Interestingly in this product, ground and white is 8Ga and red and black are 6Ga.