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[Oneilkeys]

The following is from an article I saved from an RV magazine.

Power companies are required to provide 120 volts, plus or minus five percent. That runs from 114 volts to 126 volts. Years ago, it was referred to 110 volts with an expected measurement of 117 volts. Anything below 100 volts is considered low voltage and all AC appliances should be turn off to avoid damage. Some articles said most of the AC appliances would be OK at a little below 100 volts except for the air conditioner and the microwave. Other articles said to turn off the air conditioner if the voltage drops below 105 volts. Most of the power Surge Voltage protectors turn off the power when low voltage reaches 102 volts.
You be the judge, but 102 to 105 volts is the best and safest guideline.

If you don’t have a good (expensive) protection system (not just a surge protector) you are risking all the electrical systems in your coach. You will not know when the voltage drops.