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You can't run two A/C units in that kind of heat on 30 amps. One will shut down almost immediately. Even on 50 amps you might have an issue IF you have the water heater on AC mode and the fridge on AC mode and other things on. Each A/C can pull up to 20 amps on a very hot day. It doesn't take long to use up another 10 amps. The water heater on AC mode uses 1400 watts right there. So check the other uses and perhaps have the genset load tested with a load bank as soon as you can to be sure it us putting out full power. Hope that proves helpful here. We can run some tests if you have a small digital multimeter. About $20 or so at most hardware stores and easy to use. Let me know...........and all follow ups are included in our fee.
Then take some actual voltage readings and see what you are actually getting from the source and AT the A/C. Check for a loose connection AT the A/C as the vibration from the unit may have caused a connection to come loose. Those would be the next steps here.
An A/C needs a dedicated 20 amp circuit. And do some testing and check for loose connections. When this happens check the actual AC voltage AT that A/C and see if you have any or not. That will tell you which direction to look for the problem working back towards the source.
If you don't do some testing when it happens it will be hard to nail down. And perhaps it is in the thermostat or cables. Don't overlook that as a proximate cause. Remove the cables and then hook them back up again. Check the DC voltage to the thermostat. Failing batteries can do all kinds of weird things and both of these have 12 VDC powered controls.