Hello, I have a question regarding AC output wiring on all in one inverters that supply 240v. My rv takes a 50amp 240v connection for shore power if I'm not mistaken there are 4 wires inside ground, neutral, and a black and red hot. But on the output and input of some of these all in one inverters that say 240v I only see connections for a ground a neutral and 1 hot wire why is this? And how do you get 240v out of only 3 connections.