I run a 700w Danby MW that wants 1050w input from a Xantrex built 1000 PSW inverter rebranded for a store's house brand.
I got mine on sale at half the price shown here. They come on sale every few months.
http://www.canadiantire.ca/en/pdp/motomaster-1000w-pure-sine-wave-inverter-w-remote-control-0111892p.html#.VRxPq2d0xjoI don't know what all the spec differences are if any, between mine and the OP's but mine does say it will do 1000w not 900w--maybe that's the difference, no idea.
The inverter runs the little Danby, showing its "overload" light on and the readout on the inverter says 1050w. Trimetric shows a 100 amp draw while that is happening. The inverter stays on like that for over the specified 5 minutes allowed on overload, so no issues cooking something for 15 minutes.