There's an alignment issue with the mount, even with mains power. Using the DSLR camera as the objective (prime focus), the alignment is off by about 15', no matter which alignment method I used. The result is the same if I use the 25mm Plossl as the objective. The location, date and time are on the money, the only thing I can think of is that it doesn't take into account elevation.
Any ideas?
Edit: turns out the alignment procedure is a bit more involved than first thought. I found a guide/primer on the 8SE:
http://www.astronomyforum.net/celest...ew-owners.html
I'll give it a run through the next time I use it.