What type of AC adapter does the Xantrex 600Watt Powerpack use?

I purchased a Xantrex 600 Watt Powerpack and have not been able to use it, since the charger it came with was defective.





When going to a hardware or electronics store the reps cannot help me pick which size/charge to get and I can't find it on the product description (here is a link to it: http://www.amazon.com/Xantrex-Powerpack-... )





Would you please tell me what type of AC adapter I should buy to charge my powerpack?





Thanks in advance!