At least 2500 watts.

The ice frying machine is not the kind of integrated compressor used in refrigerators, right? Is it the same as an ice cream machine, with a motor part and a compressor part connected by a shaft in the middle? If this is the case, then you can use the gasoline engine to directly drive the compressor to run. There is no need for magneto-electromagnetic conversion, which can improve a lot of efficiency! .

Each gasoline engine has auxiliary low-voltage 12-volt power, which can be illuminated by a 12-volt x 30-watt light bulb.

Oh my god, if you use a battery to supply 1800w and add an inverter, the economy and practicality are very poor. The initial investment is large, the battery will be scrapped in a year or two, empty in an hour or two, and it will be heavy. Have you ever made a budget for using data?