I believe you need to find out how many amps the convert is putting out and please do not forget to put the proper size fuse on it.
The converter that I have been using is from Digi-Key. it is made by CUI, Inc. Model HK-H1-A12, PRI - 100 -240V 50 - 60 Hz 0.8A SEC 12V=0 -2.5A (set at 2.0A)
This is the information on my converter which was recommended to me 2years ago and I have been using it without any problems.
There are a lot of different converters used with success, you may want to search this site for them, they only thing I know is that amp output is important along with the voltage. I believe the recommended fuse is 3 amps.