From the info supplied (no voltage present at any of the Fuses) it must have been Fuse 11 that failed - that should be 30A, not 20A
And probably why it failed - after the battery was drained, the charging system was sending high current to re-charge the battery plus the normal operating current (which is already in the 15-18 A or so range) and took it over that threshold.
So be sure you have a 30A fuse in that slot!