You could be getting distracted by remote power if you're new to the rig and astrophotography. You can get battery and charger to go to remote dark sites later, but you might be better off getting something like this initially.
https://www.jaycar.com.au/12vdc-7-5a...ocket/p/MP3575
After a few months of figuring out your rig in familiar surrounds at home, how to collect images, process etc may then be in a position to go offsite. When you're learning it can be a lot harder to be in a really dark remote site without internet etc.
While you're sorting out the "engineering" side of things, suburban light pollution (or even the moon) doesn't matter too much.
How do you plan to power the cameras and dew straps? the Pegasus Pocket Powerbox (or something like a "Rigrunner") could be invaluable to keep your wiring under control.