I have both the Heki and 12v compressor fridge in my Northstar. I have yet to have any problems with the Heki, but if I could do it over again, I would probably not have it. I do like the skylight at night and in cold weather it allows for solar heat to penetrate but in the summer it allows way too much heat to penetrate. I used to leave the screen/blind half open to allow some heat to escape from under the bubble while still blocking some from the inside of the camper. One summer day I went out with an IR thermometer and was reading temperatures over 190*F on the latches and other black parts between the screen and bubble. I now have a reflective car windshield sun shield tucked up inside the bubble blocking most of the light.
I do like my 12v compressor fridge. I use my rig for fishing trips and it's not uncommon for me to park at very unlevel spots while I'm out fishing. I like not having to worry about the fridge when I return. But you must have solar if you plan to use it without hookups. I originally had a single 135w panel and that wasn't quite enough to keep the batteries topped off on cloudy days. I since added a second 140w panel and that easily keeps the batteries charged and the fridge cold. It does automatically switch to AC power when plugged in.
If you have any other questions, this is the place to ask. You're going to love your Northstar.
