I have seen referenced that we can only charge 80% of rated circuit amperage. But there was not any explanation as to why. Why can we only charge at 40A on a 50A circuit, or 24A on a 30A circuit, etc. Thank you to those that answer. To those of you rolling your eyes now and thinking "this has already been answered, use the search feature." I couldn't find anything. Now is your chance to stop reading and continue to the next thread. I apologize for wasting your time.