[Carl n Susan]

I have the Progressive system and have used it many times on a 30 amp service. One particular campground we stay at is notorious for low power. The Progressive works wonderfully to cut our power when the service drop below 104V.

P.S. It happens so often that we just run off the inverter and 12V (water heater, refer, etc) and only use the shore power to charge the batteries. And since this is on the Oregon coast no AC is required.