Great feedback - thanks Paul! Agreed on the battery power pack - my friend has one in his MP and it absolutely rocks - it's the ability to boil a kettle when not on hookup, but I guess that's what gas power was invented for!
I'd really appreciate any details on your solar setup - I want to write a round-up on the best options for those too. I've seen some low profile options for the MP but involves drilling the roof - not ideal! Thanks again for your comments - makes the time spent on it seem worthwhile!
I bought my solar panel kit from Roger at solarcampersolutions.co.uk. Excellent kit and best addition I have made. I went for the black panels with black frame, see picture, have 2 panels 110 watts each I believe, with a Victron Bluetooth smart charger. Bolts on the roof rail, no need for bonding to roof and comes with full instructions, very simple to fit, cable goes through the boot trunking and connects into charger/battery underneath the fridge. All connections pre made so un clip one and clip in the other, very easy.
This was picture with just one fitted but have two next to each other identical and can get roofbox in front of them, just leave brackets for the roof bar feet in the rail all the time.
Have had fridge running all summer long with no issues, even with little sunshine battery is back trickle charging after a few hours.