I bought one of Tony's Model S UMC connectors, and used Chris Howell's new European OpenEVSE board (it is capable of directly running 240V contactors), along with a 40A contactor, and some of Tony's UMC replacement cable (similar cable to the UMC), to build a 40A OpenEVSE... why you ask? who not... why do men climb mountains, because they can
It runs considerably cooler than the Tesla UMC as well, I used 8AWG SEOOW 105 degree C insulation (rated for 40A, but it doesn't even get warm) for the input, on a 14-50 plug. The EVSE cable (basically a copy of what Tesla is using), does get a bit warm. I had to splice the connector to the cable, I used the new solder butt connectors that you heat with a hot air gun to make the connections, seems to work well. All of the splices are then encapsulated in a larger piece of heat shrink.
You might notice I have the OpenEVSE set at 41A, that's one advantage of OpenEVSE, you can adjust the pilot.. I can adjust it in 1A increments from 40A up to 45A (which is %90 of the 50A breaker), under certain conditions you can try and push it. Of course it has lower settings too, such as 12, 15, 16, 20, 24, 30, 35, etc as well)
Photo's
40A-OpenEVSE Photos by mitch672 | Photobucket
Slideshow:
40A-OpenEVSE Slideshow by mitch672 | Photobucket
It runs considerably cooler than the Tesla UMC as well, I used 8AWG SEOOW 105 degree C insulation (rated for 40A, but it doesn't even get warm) for the input, on a 14-50 plug. The EVSE cable (basically a copy of what Tesla is using), does get a bit warm. I had to splice the connector to the cable, I used the new solder butt connectors that you heat with a hot air gun to make the connections, seems to work well. All of the splices are then encapsulated in a larger piece of heat shrink.
You might notice I have the OpenEVSE set at 41A, that's one advantage of OpenEVSE, you can adjust the pilot.. I can adjust it in 1A increments from 40A up to 45A (which is %90 of the 50A breaker), under certain conditions you can try and push it. Of course it has lower settings too, such as 12, 15, 16, 20, 24, 30, 35, etc as well)
Photo's
40A-OpenEVSE Photos by mitch672 | Photobucket
Slideshow:
40A-OpenEVSE Slideshow by mitch672 | Photobucket
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