Beware of how you do this. You can hook them up, but don't expect them to supply more than 16 amps on a 20 amp circuit in terms of load to the systems. You'll likely trip your breakers. You can get long run time this way though. It's really just a manner of swapping out the plugs. Look for 5-20 or 6-20 plugs (5 or 6 for 120 or 240 voltage respectively).