I'm looking at setting up coffee van and have found 3.5 kW 2 group espresso machine... However it appears to be electric. Can I use a generator and or inverter to power these both without making too much noise and it costing too much. Obviously I'd prefer gas but these machines are expensive and with grinder and fridge etc maybe it's better to use electric all round. Can someone give me options on best way to power this machine? I'm looking at buying today so any info is appreciated. Thanks 
