I now use a mains powered hairdryer, this is kept in my workshop along with the EP Box it's normally 50-60f in there, the secondary gets a blast of warm air clears in seconds and as do the EP's before i use them and when there returned to the case, i just couldn't stand there with a 12v unit the little bit of puff it gave out meant the Tracer would die very quickly and the Obby PSU's wouldn't drive without a voltage drop and there by screwing up the Mount supply and then the GoTo, this is all referring to the Dob the Imagine rig will need a some form of secondary dew protection, taking the kit out of the focuser to give that a puff would really kill a imagine run....