Look at the back of your units,on 240 volt, add all the wattage up. Ie 2400 watt divided by 240 equals 10 amps
Divide the wattage by 240, then throw 10% away as a rough rule of thumb.( so you would be using 11 amps)
On the conservative side.
Hope this is what (not Watt) your chasing.
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