a 700 cooking watts, MW will draw about 1050w, add 10% inverter loss/conversion
and your pulling 1155w from the batteries thats 90~100 amps depending on battery voltage
an engine starts in 2~5 seconds, the inverter will be running for ?? minutes
1 minute to heat water or a cup of coffee would be 20-30 times the power needed to start the engine
6 minutes to bake a potato 120-180 times the power needed to start the engine
large loads require a large battery bank,
fully charged your new two GC's might nuke your bacon or make coffee
but early in the morning after being used at night, you might do them more harm, than you think
i have over 900amp hrs of battery bank, and i still prefer to use the generator for the MW or coffee maker , i will use the inverter, if its quiet hours
but i often buy pre cooked bacon that takes only seconds to heat up
i bake potatoes at supper during generator hours
i can make a 2 egg omelet in 90 seconds, even then i might start the drive engine and let the alternator help the batteries power the inverter