You say you are plugged into 50amp. Check that breaker and do both of the legs have power. When you did your inhouse breakers to reset did you turn all of them off then on. Check your GFI outlets make sure they are not tripped.
As stated before double check the battery wiring make sure you did not miss a cable. I know about that from experience drove me crazy for a couple days then a non connected wire showed up. Make sure you did hook up correct wires to pos. and neg posts. Is your battery disconnect switch turned on.
