As examples: a Glass Hive Short Guy (
http://www.theglasshive.com/BEADANNEALERS.html) takes 8 amps at 110 Volts. A Regalia 10 LPM oxycon (
http://www.oxygenplusmedical.com/seq...ncentrator.htm) requires about 5 amps at 110/115 Volts.
To power both of these at once would require a 1500 Watt (min.) generator - see
http://powerequipment.honda.com/gene...how-much-power for more information on how to calculate energy needs. So something like this Honda generator would probably work
http://powerequipment.honda.com/gene...models/eu2000i
Depending on where you stop to work you may be able to plug-in, so perhaps a few good heavy duty extension cords are all you need