Thanks for the feedback — sounds like 100W portable will be the ticket for me.
Although my fridge is 12v only (no LPG), my electrical usage is low. However, I’m almost always in obscured conditions so 50W might not be enough.
I have a Zamp solar ready port on the exterior of my camper — my understanding is that they’ve reversed the polarity. However, their panels are enough more that I’m inclined to explore cheaper options