No need for 12VDC as the skylight just needs sunshine to do its job.
We leave the door open all day, but once the sun is above the TT, it is dark inside. Having the skylight will/should eliminate the need for interior lights being on in the middle of the day, even thought we use LED's. Less power drain while dry camping...
2013 Jayco Eagle 284BHS
250Watt Grape Solar Panel, MorningStar MPPT 60 Charge Controller
1500 Watt Ramsond PSI, 2 Trojan T145 Batteries (260Ah)
2 - AirSight Wireless IP Cameras (used as rear view cameras)
EnGenius WI-FI extender, D-Link wireless (n) modem
MagicJack Internet Phone
2012 Ford F150XLT, EcoBoost w/3.73
157" Wheel base, HD Towing Package
Our Solar Album http://www.jaycoowners.com/album.php?albumid=329