The $35 14-50 adapter will allow your mobile connector (UMC) to plug in, but this generation of UMC is limited to 32A. If you want to use the full 40A you're allowed to use on a 50A circuit, they also have the Corded Mobile Connector. It's expensive, like $450, but is a UMC with a hard-wired 14-50 plug. That is a nice alternative to the Gen-3 Wall Charger if you're not installing a new circuit and already have the 14-50 outlet.