best way to run residential fridge on limited shore power?

OK i was wrong it's pulling the line voltage down to 109ish. Saw the 2nd zone go to 106 for a brief moment.

Total amps it's using hover between 18-20. These are airexcel high efficiency ACs if that matters. I put them on cool high. Don't think it registers fast enough to show the spike when it kicked on.

Only reason I need the 2nd one on is to get enough air into the back bedroom for sleeping at which point I would have everything else off.

At what point is it damaging the AC? below 100V or is that 106 - 109 an issue?