Hi Mr Wizard,
I've been lucky with having friends and clients that allow me to plug in. Tonight is typical. I have two 15 amp circuits (both GFCI so I'd not be able to use the Magnum).
The battery bank is hungry from running the fridge for most of the day on 120 volt via the inverter. The PD is charging at 22 amps and voltage is only 13.4 (it went into boost mode).
I did my usual checks--and found that voltage dropped to 107. So I added the autoformer which boosted voltage back to an extremely acceptable 116.
The other line is running a 1500 watt (really not 1500) fan based heater. The front of the RV is up to 20 c now (68 f), and the bedroom is about 18 c (64 f).
Once I get the RV heated, I'll turn off the heaters on the autoformer and use the microwave to warm up some turkey!!! I may have to use the Wizard to lower the charge rate or even move it over to the other shore power cord.
I know I can manage -7 c (20 f) on two 15 amp circuits. After that I need three so it is off to the expensive local campground.
I'm missing the Magnum big time.