Even with microaire voltage drops to 97 volts, when starting the Dometic 13500 air conditioner with a Yamaha 3000 Sieb. If I add the load support feature on the Magnum to the mix, voltage still makes a huge excursion down and the red over load light triggers on the Magnum remote.
Further, I had to "tweak" the cut in voltage on the autoformer to cut in at 113 volts, when on shore power after the microaire was installed.
If I were to do it again, I'd save my pennies. (i.e. I "fixed" something that was not broken.)