Solar Gurus - your wisdom please!!

On my current Adventure camper I have 2 x 65W solar panels which are fixed but tiltable. When camping I orientate the camper so the panels face approx N and tilt them to an appropriate angle and have to date had power to burn.
My new Quantum will have 2 x 80W panels fixed flat to the roof. As they point straight up I assume the orientation of the camper doesn't matter as long as the panels are in the sun for as long as possible each day.
What I'd like to know is how efficient are they going to be. Assuming my current setup is as good as it gets in terms of maximising 'sun catching', what percentage of this 'sun catching' ability will my new set up have?
Thanks in advance for your thoughts
Cheers
TG
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