That is the NEC's stance. With a 90A circuit you could only charge at 72A. OpenEVSE goes in 2A steps. in any event while I am sure that 100A or better contactors exist I am sure that they are expensive, They would be industrial items . Chris charges $123 for his 90A unit. He makes only a small profit on it. Not like the 40% mark up some suppliers use. I do not want to run any contactor at its limit. on a 90A contactor the most I would pull is 60A. For example I use a 65A contactor at 40A. With that reserve it runs very cool. Not like a Chinese 50A contactroor previously Used.
Your OpenEVSE unit has a 30A Potter and Brumfield relay and a 30A Ji772 cable. 30A leaves no reserve. A enhanced Leaf draws 27.5A leaving only a small reserve. Early Tesla's used that same relay at 40A. If it suddenly opened at that current then it was warranty time. The relay is only rated to pass 40A, not switch it. In Teslas' defense they spot welded all connections. but still that poor relay!
Last edited by GlennD
on Wed Dec 26, 2018 6:05 pm, edited 1 time in total.
2013 Pearl White SL Premium
Traded for a Cirrus White 2014 Mercedes B (totaled)
2016 Urano Gray eGolf SEL w/ drive assist
Loved the VW but it sat too low for my old body
Back to a Cirrus White 2017 B250e
White Ioniq limited.It sits just fine