@Kettlewell: According to Torqeedo it is "completely waterproof to IP 67". However history
showed me those connections where not.
The power point is the only weak point that I found on these units the rest of the unit is all well sealed.
I also have the smaller t1003 unit that I keep on my dinghy
it has a different setup but I can tell you from experience it is fully submersible without problems.
Now I am sure if the power connector was more like the one in the attachment here there wouldnt be a problem.
I could probably take the plastic cover thats sealed off bring it and have it redesigned and printed like on a 3D printer with a new layout for the power.