You should provide details on your coach to help answer the question. In current Winnebago Class A DPs, the Magnum inverter is installed along with an Onan EC-30 AGS. You can set the quiet time in the Onan EC-30. The Magnum AGS is an add-on separate module and to my knowledge, is not installed in current Winnebagos. That is likely not a bad decision as the EC-30 is easier to program and offers greater functionality than the Magnum unit. If you want additional info on the Magnum unit, you can D/L manuals on their site. If your coach has the Onan EC-30, you program your quiet time there and not in the inverter.
09 Journey 39Z