Wonderful calculator at calculator.net. Voltage Drop Calculator. Plug in Amperage used, distance and wire gauge and it will tell you the voltage drop in volts and percent. If you drop to 105vac, you will be on the edge of damaging electric controls in your appliances. Voltage loss will depend on actual amperage used on that length and gauge wire.
Having an Electrical Management System like a Progressive Industries one will tell you actual voltage and protect from out of spec power. Even a Kil-a-watt via a 15-30 amp adapter will let you know of power variations as you turn on different appliances.