I plan to hard wire it into the DC distribution panel with a 30amp fuse and appropriate sized wire.  We won't be running anything more than the coffee grinder and recharging a computer and phones. Not having fresh ground Colombian Supremo coffee, is not a good way to start the day.  I looked for 12v coffee grinders and what little I found makes the inverters look inexpensive.

 I just got off the phone with the tech at PowerTech and he said that for their 600W inverter you really need to do a direct connect to the battery.  He suggested 8 awg wire and an 80 amp inline DC circuit breaker.  I can pick up the DC upstream from the distribution panel, put the breaker in there, then run the wire to the mounting point for the inverter.  I had planned to put it next to the distribution panel, but due to its thickness, it's guaranteed to cause bloody shins in the night.  I'll have to poke around for an easy and convenient place to put it.  I might put it under the seat where the water heater and furnace are and wire hook it up to a standard AC plug on the wall under the seat.  The bad thing is that the on/off switch is on the unit so it has to be pretty accessible.  The bigger units come with a remote on/off switch.  Yikes! all of this for a fresh cup of Colombian Supremo.  ....it's worth it.

 I already wired in a couple of USB ports just the other day.  In fact it came with a nifty volt meter that give battery voltage as well as a 12v plug.  I got it from Amazon:  https://www.amazon.com/gp/product/B01MTBXHEV/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

I put it on the wall next to the fridge and ran the wires through the back of the space behind the fridge.  It's in a convenient but out of the way space.