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8.6kW UMC Gen 2 Charging on SR+ with 277Vac!

earthwormjim

Member
Jun 25, 2019
167
179
California
I decided to update the wiring at my work where I do most of my charging. I was using a 30A 277V circuit, with a NEMA L7-30 to NEMA 14-30 pigtail, connected to my UMC with 14-30 adapter. I was pretty happy with the speed, 6.4kW for only 24 amps is pretty good!

But that wasn't enough, plus I wanted a closer outlet, so I used relocating the outlet as an excuse to upgrade. I installed a 40 amp 277V circuit (Nema 7-50 outlet, 8AWG wiring), ordered a NEMA 6-50 adapter from Tesla (it was cheaper than the 14-50), and made a 7-50 to 6-50 pigtail adapter. Now I'm seeing 8.6kW (32A @ 269V, nice) charging on average, sometimes up to 8.9kW in the morning when line voltage regulation is at 277V. Pretty good for a SR+ which is normally quoted as 7.7kW max.

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