MrWizard wrote:
converter 5amps * 120v 600 VA/watts input
your looking at 35amps charge into the batteries unless the converter is failing ...
If that power is going to the battery bank, they will be quickly overcharged. It is possible there is another 12VDC load consuming power.
Most DC fuse panels use plug in fuse. With someone monitoring your EMS, start pulling those fuses, one by one, until to current drops.
I always recommend RV's who are a bit "handy" buy an "amp clamp" multi-meter. UNI-T has several models to choose from under $50 on sale on Amazon.com