No issues @ 117 as it pertains to harmful effects on your AC unit running for prolonged periods of time. Our rig is always plugged in while stored in our side yard, we have run our AC unit a few times off of a 20 amp circuit with no issues.
We use plug in type voltmeters available from Amazon or Ebay, we readily know at any given moment our state of DC and AC voltages. Once in a blue moon I will drag out the Fluke DMM although it has been a few years since the last time, these plug in voltmeters are not Fluke accurate but close enough for every day usage.
