Hi outwestbound,
To adjust the Magnum charging rate, touch favs, then rotate the dial until F3 appears. That allows you to select the number of amps that the Magnum will draw from shore power (lowest setting is a mere 5 amps) or from a generator (in my case 24 amps from the Yamaha 2800 sIEB).
I do use this feature to limit my demand to 80% (12 amps for a 15 amp, 24 for 30, and 40 for a 50 amp shore power).
If you are in load support mode this will trigger it sooner. If there is poor voltage then limiting the amps can "force" the Magnum to do voltage support and not just load support. I DO NOT RECOMMEND THIS.
Voltage support is best done with an autoformer.
