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The first thing would be to see if you have it overloaded. What else do you have on for any AC loads? Water heater or fridge on AC mode? Those would make a difference on hot day. The set may need some adjustment as well and a load bank test would show you that.
Just checking back to see if perhaps you may have missed my previous response to your question? Easy to do considering the volume of e-mail that most of us get every day! If you need me to resend this, please let me know. Thanks!
It might be or just too much load. 4K is only 4,000 watts and on a hot day the A/C can draw about 2,500 by itself. If this isn't tuned up properly or the generator isn't putting out the full 4,000 watts that can happen. Maybe have it checked and load bank tested to be sure. Thanks for getting back to me.