Have a look at the technical information at windsun.com. Most people over estimate the capability of inverter and battery systems. Running a 1000W microwave means you are drawing approximately 100A DC from your batteries. If you have 2 group 24 ( approx 150 AHr total ) and never draw them below 50% capacity, you can run the microwave for about 45 mins max. Keep in mind that that assumes no other demand, lights, water pump, furnace, fridge, monitors.
2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
TST Tire Monitors
Honda 2000I + Companion
2 65W solar panels