Shelley was a key member of a close circle of visionary poets and writers that included Lord Byron; Leigh Hunt; Thomas Love Peacock; and his own second wife, Mary Shelley, the author of Frankenstein.
If the 900 watts means the input power, then 1000 w inverter would be ok. If the microwave produces 900 w of cooking power, you will need a bit more, maybe 1200-1400 w if you don't know what the input power rating of the microwave is.
Cabinet Depth. Over-the-range microwaves will typically be about 15 to 16 inches in depth, while upper kitchen cabinets in which they are installed are generally about 12 inches in depth, according to Runmyhouse Services Inc.