My first reaction reading this is that a bigger inverter/charger can power a standard microwave. But you've found a lower-powered one that works. Good on you. Our microwave sucks our 330ah house bank down rapidly, but it's useful for exactly what you describe. (The toaster uses more amps than the microwave though. I took it off the boat after getting a toaster that fits over the propane stove.)
Second thing, you got the battery monitor. It's the most useful upgrade we've put on the boat.
Do you have a fridge yet? That will really use-up the amps and will require a nice big solar panel or two. LED interior lights could come first (conservation is cheaper than more generation). Once you get the solar panels, you won't need the dock very much at all.
Retired too. Does that mean you'll be cruising full time for awhile?
Good luck and enjoy. Post pictures.
Great minds discuss ideas;
Average minds discuss events;
Small minds discuss people.
The best minds discuss sailing.