It should be written on a tag on the unit or in the paperwork with the unit. Might not tell you the wattage at different speeds, but it will get you in the ballpark.
I use a 2012 model Frigidaire 30 pint unit. When it's active in dehumidifying, its 300-302W. It's also an "Energy Saver" model. Only because it has an RH thermostat on it. Takes some energy to run the compressor.
Turbo mode on my 50 pint uses 520 watts normal mode is 400 watts. Compressor runs till the coils freeze up then it shuts off and the frost melts into the pan then the cycle repeats My compressor doesn't stay off long maybe 4 or 5 minutes.