Mike
I would start by taking the cover off the circuit breaker box (mine is in the bathroom). Using a VOM (Volt, Ohm, Meter) set to a scale of at least 120 volts AC, test both sides of the circuit breakers for your air conditioners (VOM red lead to circuit breaker connection (black wires), VOM black lead to ground bus (white and bare wires)). You should have 120 volts +/- 10 volts on each circuit breaker. If you have no voltage in this box, then you must trace backwards to see where it is being lost. Considering your description, I would suspect that you have lost the ATS (Automatic Transfer Switch) where your shore power supplies and generator supplies come together. If you are not comfortable testing live AC power lines and knowledgeable about appropriate safety precautions, then I would leave testing the ATS to a licensed electrician. Good luck.
Richard