Sorry, didn't read far enough, my bad. This is 350watts and will run multiple chargers as long as charging doesn't use more than it supplies.

http://www.progressiverc.com/index.p...emart&Itemid=1


There are PSs available to well over 1000watts. PS selection really depends on what you're charging and how many chargers you'll be running off the same supply. You can determine the needs of each charger then allow for the chargers inefficiency and get the needed wattage in a PS.