Originally Posted by BigTJohn
I think if you are a 30 amp site, with the adapter needed to connect your 50 amp main cord there will not be power - as in a dead feed for the second A/C unit. Without two 50 amp feeds for the 2 50 amp breakers, half of the cord will be dead. You will only have a single feed from the 30 amp box 1 hot, 1 neutral, one ground (3) wires. In the 50 amp, you have 2 50 amp hot, one neutral and one ground (4) wires.
Big, if he made his own adapter that might be true, but the ones you buy at the store power both 50-amp hots off of the 30-amp hot. Why would you want it any other way?!? You still have only 30 amps to work with of course.