We also have 30amp service and two airs...the system your talking about works to prevent overloading the system.
Lets say if you have both airs on and turn on the microwave...the system will shut down one of the airs until the microwave stops. It does this automatically.
There is a button on the front and a led screen for selecting the power source. If you have 15 amp, 20 amp, or 30 amp. Selecting say 15 amp will make the unit shed more stuff quicker.
It works great...we don't even notice if it sheds say the electric hot water heater or the electric setting on the frig when we turn on both airs because it returns those when the airs are not running.
Found this on their website which might help explain it better:
Overview: Fully automatic Power Control System which requires little to no user interface. The display is there
to help the RV user understand power management and the function of the Midi-PCS. The Midi-PCS
monitors the total AC current of an RV and prevents circuit breaker tripping by momentarily shedding up to five
loads. As the user turns on additional appliances (such as a microwave, coffee pot, or hair dryer), the MidiPCS
can shed the loads that it controls, (such as the water heater & air conditioner). As the user’s selected
appliances are turned off, and a minimum of 2 minutes has expired, the Midi-PCS will automatically turn power
back on each of the shed loads in reverse sequence, . The Midi-PCS will constantly monitor 120VAC RV
power and shed and restore power to the five controlled loads. The display panel has all the brains, a data
connector to the I/O module, and an additional connector to control the air conditioners through low voltage
signals. The I/O Module houses a current sensor, two relays to control 120VAC powered appliances, and
Service Type detect circuitry.
2018 Greyhawk 29MVP
2018 Jeep 4 Door Rubicon Recon
Retired and Under New Management (See Spouse For Details)