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It can be, but the more probable cause is that the batteries are failing. I would start by having them load tested to be sure. You can easily test the converter with a small digital multimeter like you can find at most hardware stores for around $20 or so. The converter should be putting out about 13.7 VDC and you can usually check that at the fuse panel. If you can give me the make and model of your load center I can add more here. All follow ups are included in our fee.
Just checking back in to see how this is going? Were you able to get the batteries load tested? Please get back to me if we need to dig deeper into the problem here. Thanks!