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.
Add the height of your microwave to determine the bottom of the cabinet over the microwave. This will put the bottom of your microwave at the 54 mark. 16-19 is the going height nowadays for modern microwaves, with 17 being the most common size.owever, they then decided on a microwave unit above a gas range, and the microwave manufacturer, Panasonic, stated that the unit could be within a minimum of 13 5/8 from the countertop for an electric stove, and 16 for a gas range. Ah ha-now we have a problem!