No power on inverter without mains power

My batteries are at 13.28v but when I disconnect the mains power (shore power or generator) my inverter shuts down. Victron connect alarms with low battery.
Can anyone advise please?

Check if those 13V make it to the input terminals of the Multiplus (i guess?) May be a blown fuse. Also check that the mode switch is set to “On” not “Charger only”

Thanks, I’m new to this. I found a blown 200A battery fuse, I’ve replaced it and we’ve been running on inverter power for half an hour now.

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