Running it, 1800 watts will be fine. However, it isn't running that is the issue, it is the inrush current which can get up to 60 amps, and for that you will need to have around 3500 watts. These watts can be from a pair of Honda eu2000i models, or a 3000 watt generator with access to the battery for the few seconds to deal with the compressor starting up.
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