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Brad,

As far as I remember you have a Magnum 2812 inverter.  The Magnum is rated for 3900 Watts (Volt-amps) surge.  This means that the maximum AC surge load is 3900/120 = 32 Amps.  

Since I usually went ped-to-ped and almost alway ran the generator…the microwave on battery was not an issue. 

I did a quick check on microwaves and most seem to pull about 12-13 amps. 

So…unless you have something like heaters going….the inverter should be able to handle the load.

Do you have an AC clamp on ammeter?  If so…you can get an AC load splitter and measure exactly how much draw is coming from the microwave. 

https://www.amazon.com/gp/product/B003A0...UTF8&psc=1



Something else you might want to consider is to get a second inverter and stack them.  I dont know but I suspect that you could double your amp draw capacity*.  *double check before you take my word.

Bill

I do have a clamp on amp meter.  Just by looking at my Magnum screen I'm pulling 13A as a baseline.  Fridge kicks on and that take me up to 27A.  When the microwave was on (I'm not sure if the fridge was cycling or not at this time), but when the microwave was on that took me up to 170A for a minute until it kicked off.