> contactors . . variation in quality. [hcsharp]
I just looked at the updated 'DIY EVSE' project and this worthy endeavor seems to have reached the 'DO try this at home' stage. Very good news indeed. I like that they suggested de-rating it to 24 amps IF you use the moulded plug/cord thingy rather than hardwiring it to a service box. A cautious approach.
However, the contactor specified seems less than robust. Can it be relied upon to break your pricey Tesla from the mains if the Tesla requests this?? My emotional response, unimpeded by the thought process (granted), is that I would want more of a 'clunker' here. Like my 50 amp Cutler-Hammer on my water heater that I can hear thru the wall when I turn on the timer: CLUNK. Sure it draws a bunch of watts, but that heavy spring will ensure a clean disconnect. Compared to all the other goings on during the Charge Cycle (fans, more fans, AC pump, etc) is saving a few watt/hours that significant? Genuine 'clunkers' list for $250+, but NOS on eBay was less than $20-US.
Also, I assume the Tesla has its own contactor so it can shut down EVSE current should the EVSE contactor fuse. Just guessing here, since the HPMC cord presumably contains no contactor.
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