Welcome to the forum, Suzieb

Although I do not have solar blankets

I have seen other travellers

Lay them flat on the ground

Prop one end up, and tie it to the back of a chair

Prop one end up on two sticks

Lay them across their bonnet (if towing a caravan)

I have never actually seen anyone, with hooks on their vehicle/caravan/awning, so that they can hook their solar blanket on

I think that the important thing, is to position it, so that the sun is shining on it

Suzieb wrote:

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Where or how do campers hang/position their solar blanket for optimal performance?

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We just lay our 250W blanket on the ground or, if the car happens to be facing north, across the windscreen. On a pretty bright, sunny day the batteries are at "float" before lunch.

Another thing with solar panels especially with blankets is to keep them clean. Much more than our solid panels they collect dirt. Lots of dirt.