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We have 2x 80 w panels on the roof - these are wired in parallel and have their own solar controller
I went for narrow panels so they could lay between the ribs on the roof - I chose flexible panels as I did not want to increase the height of the van at all, it was important to keep below 2.1 metres for car park / height restriction access, also they keep the roof weight down.

As solar panels give very little when the van is shaded I also have a 100w panel that can be positioned around the van and pointed at the sun, this controller has it's own controller

Solar is great but you only get power when the panels are in the sun, the power drops dramatically when a cloud floats in front of the sun or the panels are in the shade.