Swapped the van battery over today as I have two,one in the van and one at home on charge.
For any new readers I thought I would repeat some advice given a while ago.
When replacing/reconnecting the battery don't forget to remove the fuse from the solar panel ( Truma say to cover the panel but removing the fuse is easier ) replacing the fuse afterwards of course.
The solar panel fuse can be found under the near side rear bed in a bundle of wires adjacent to the fridge and is blue in colour.
If you don't remove the fuse or cover the panel it can damage the controller which is an expensive mistake.