My friend Quinten stepped by and since he owns a Nissan Leaf this was the perfect opportunity to really test my openEVSE. We set the amps to 16 and plugged in the Nissan:

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aaaaaaannnnnnnddd:

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It works!! The Leaf is charging from my homebuild openEVSE.. Awesome.
We decided to push it some more and upped the amps to 48, and plugged in the Nissan again..

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Also works!! well.. for 30 seconds that is.. then the fuse blew..
Turns out the Nissan Leaf charges at 32A on one phase.. and since I installed a 16A fuse, this will not work.

I tried to research the Model 3, and I think it has a 3 phase charger.. so that should work, but I'm not totally sure.