I'm an electrician and I have a customer who has purchased a 2012 VOLT. The charging unit has two setting, 12A & 8A. When he sets it to 12A the unit displays the "red" light indicating a Ground Fault. If he uses the 8A setting it is better but still, sometimes, gets the same result, "red" light.
He has used this at other locations and seem to be working just fine on either setting. At his home the electrical source, panel, is ~120' away, 15A #14 wire. Could there be an issue with Voltage Drop causing these results?
Thank you in advance.