GeekEV wrote:I know Ingineer has expressed concerns about runs that long causing too much resistance and creating a lot of loss, thus impacting your charge times and possibly heating the extension cord up too much. Perhaps it's better because you went with 8/3 instead of 12/3 wire
Cord length will definitely increase voltage drop, which would mean slightly slower charging and slightly higher bills. Google "voltage drop calculator", and you can quantify this. Use a maximum 1% voltage drop to be really conservative, or use 2%. For example, according to http://www.southwire.com/ProductCatalog/voltdrop.jsp
if you are using #8 Cu for a 12 amp load at 240V, the length needs to be 144 feet or less to limit the voltage drop to 1%. For #12 Cu, the maximum length for 1% voltage drop or less is 57 feet.
As for heating problems damaging the cord, the only way the cord length matters is if you coil up the excess cord. As long as the cord is laid out so it doesn't touch itself, you're fine.