As long as teh power supply outputs a little more power than you're using to charge, it will run a charger. Your charger has 250watts of output power. If that is the Ofna PS that has adj voltage, at 14v and 18amps, thats 252watts. Its not enough to run charger at full power, but close. There is some inefficiency in a charger, not sure just how much.

Rehgardless, that supply will certainly run the charger to charge almost anything you'd be charging.