I have installed a Victron MultiPlus-II 48/5000/70-50 230V in my boat. When I am away from my boat I would like to switch off my batteries and run a single 230V group (security camera's, and a few lights) from shore power only. I tried this by simply switching off the batteries but then the entire Victron shuts down. I thought it would continue passing through shore power but apparently it doesn't. Is there any way to do this?