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Yep. Normal. I 'turn down' charging current to 20A unless I need faster, figuring that less current means less resistance loss and thus less heat in the cable.I notice when I charge my 2022 MYLR from the Tesla Wall Charger the charging cable is warm at the end of a 3 hour charge. Is this normal? It is not hot but definitely warmer than the outside temperature.
not a bad idea. As long as it doesn't get too hot the heat doesn't damage anything but like @Tronguy said, resistive power loss is proportional to the square of the current so cutting the current in half cuts the heat and power loss in the cord by 75%.Yep. Normal. I 'turn down' charging current to 20A unless I need faster, figuring that less current means less resistance loss and thus less heat in the cable.
Acceptable temperature depends primarily on the type of insulation used. Copper doesn’t melt until about 1000°C, but the insulation will melt and burn long before that. 125° F should be ok, regardless but it’s impossible to say without knowing more.I've often thought my (Clipper Creek 50A, charging at 40A) cable gets hot, but it's the same temp from end to end. Garage temp in the 90s.
My cheap IR thermometer reads 125f. I believe anything under about 140f is acceptable. Please correct me if I'm wrong!
Not a very useful response since temperatures well below those values would likely mean that some connection is generating excessive heat and may be close to catastrophic failure. Do they seriously suggest that if the cable and handle gets hot enough to burn me, that I should just "be mindful"? I also seriously doubt "there has never been an issue". I'm sure that hundreds, if not thousands of their units have failed over all the years that Clipper Creek has been selling EVSEs. By their nature, they get plugged and unplugged often and cables and plugs wear out.I asked Clipper Creek about the 125f temp of my charging cable. His response:
...So the rubber jacketing of the cable is rated for 105°C and the internal wires are 10AWG 90°C, which means they can withstand 221°F and 194°F respectively. With that kind of ambient heat in your area and charging during the day the cable is definitely going to get hot. However, we do have these stations installed outdoors throughout California, Arizona, Nevada, Texas, etc, where they have the same heat, plus direct sunlight and there has never been an issue. Just be mindful of the cable when going to grab it and maybe keep it more uncoiled during hotter times so the heat can dissipate faster.
THESE ARE CLIPPER CREEK NUMBERS, NOT Tesla EVSE numbers. Tesla should be able to answer the same question.
It was a very useful response. @Pianewman asked about the cable temp and they answered with clear information on what temps the cable can handle.Not a very useful response since temperatures well below those values would likely mean that some connection is generating excessive heat and may be close to catastrophic failure. Do they seriously suggest that if the cable and handle gets hot enough to burn me, that I should just "be mindful"? I also seriously doubt "there has never been an issue". I'm sure that hundreds, if not thousands of their units have failed over all the years that Clipper Creek has been selling EVSEs. By their nature, they get plugged and unplugged often and cables and plugs wear out.