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Thanks, I had done some googling but did not find that page. given proximity to my shed, a DC power supply for the heaters sounds like a plan, leaving batteries for the rest with resultant lower current draw.
I am thinking of batteries still for the mounts as a short power interruption is not going to bother a heater but could really break a night of imaging when the mount stops tracking long enough to loose the guide star after we have gone to bed for a couple of hours.
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