Happy (belated) Birthday H.
I presume you are talking about a back yard power supply. I've go no complaints with my
MP3098 but since it's not waterproof you do need some cover for it, just in case.
You might want a 15-18V supply to power the Losmandy mount.
SnapTec make 12V->15V inverters and have said they would custom make 12V->18V to order. Part numbers are GB60-1215 and GB60-1218