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You mount will draw less than half an amp when tracking, so run that off the power tank.
The laptop and camera will draw 5-7 amps combined. Peltier coolers draw ~2amps.
You shouldn't fully discharge a deep cycle battery. Not more than 50% unless you don't mind shortening its life dramatically (don't know why they don't call them a 50amp.hr battery) so you're not going to get much more than a nights observing from that battery.
Remote observing is a challenge!
DT
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