first, there are lots of alternatives to using a generator just to brew coffee. especially instead of the power hungry Keurig. i love my Keurig but never take it dry camping. i use a Coleman stovetop Drip Coffeemaker.
second, your water heater should be running on propane, instead of running the generator just to heat the water on the electric side.
third, never use the 2000w generator to recharge the batteries when you plan to use power hungry items like the Keurig or the microwave.
make sure the batteries are already recharged before using it for those items.
or as caper said, turn the breaker off for the converter.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC