Huge fuse blows,Batteries dead

[berghild]

this a return of last summer's problem with the big fuse by the Xantrex 3000. we replaced the orginal fuse with a bigger, badder fuse. It seems to blow when we leave the Inverter enabled while plugged to shore power. THis time we didn't notice that it blew and woke up to dead batteries.....bone dead. they are now at the shop being charged and waiting to see if they will hold a charge. What do you think..will they come back after being totally dead? And the refrigerator is out. Do I remember correctly that it won't run on AC if the batteries are dead?
the Air won't run because the thermostat must be DC and of course...the electric toilet doesn't flush.
The shop gave us one battery to keep us going...but we must have it hooked up wrong...wany pointers to help with that?
thank you everyone, I always know I can come here and get answers!
Cyndy