Using what you have to do what you want to do will not be highly efficient.
Using a 5000-7500 watt motor-generator rig to charge 2 batteries and run a microwave is serious overkill. Unless you add way more batteries, they will never charge fast enough (nor hold enough energy) to keep the generator from running much less when your demand is high.
When your demand is low, the two battery bank will only hold about one battery rating of mah before you would need to recharge them.
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