I have the opportunity now to charge from a 5-20 outlet at work. I was happy for this, they even checked and replaced the GFCI outlet for me. It's in a 6 year old building that is designed to use a lot of power for computer stuff, and as near as I can tell from looking at the breaker panels, and the outlets are all marked for what breaker they go to, there are only 2 outlets on what should be a 12 gauge wire. The wire run is about 130-150 feet, maybe a bit more. The other outlet has nothing running on it for power draw.
When I plug in my 3, the voltage starts at 120, but by the time the charging ramps up to its full 16 amps, voltage sags to 107. It's right on the edge of tripping the charge off. I initially used a new 12 gauge extension cord and was only able to get 105-106 volts with constant extension cord warnings.
Today the car charged at 107 for a while, then it had the charge going on and off, up to 120, back to 107, pausing in between, etc. So I dropped the charging amperage from 16 to 15, and that stabilized it at 108 volts.
There's only 2 GFCI outlets on this circuit, and I've traced the wires. Initially I thought maybe the wiring to my outlet was going into and out of the other GFCI, but I pulled it out of its wall recess, and no, it only has a single hot, ground, and neutral going to each of the 2 GFCI receptacles. So there's a Y connection somewhere in the system, and it's all in metal conduit. So it'd be a real pain to pull it apart and look for a bad connection.
Or maybe I am over thinking it, and it's just a long run from the breaker panel even for 12 gauge wire causing the voltage drop.
When I plug in my 3, the voltage starts at 120, but by the time the charging ramps up to its full 16 amps, voltage sags to 107. It's right on the edge of tripping the charge off. I initially used a new 12 gauge extension cord and was only able to get 105-106 volts with constant extension cord warnings.
Today the car charged at 107 for a while, then it had the charge going on and off, up to 120, back to 107, pausing in between, etc. So I dropped the charging amperage from 16 to 15, and that stabilized it at 108 volts.
There's only 2 GFCI outlets on this circuit, and I've traced the wires. Initially I thought maybe the wiring to my outlet was going into and out of the other GFCI, but I pulled it out of its wall recess, and no, it only has a single hot, ground, and neutral going to each of the 2 GFCI receptacles. So there's a Y connection somewhere in the system, and it's all in metal conduit. So it'd be a real pain to pull it apart and look for a bad connection.
Or maybe I am over thinking it, and it's just a long run from the breaker panel even for 12 gauge wire causing the voltage drop.