Are you going to have it permanently fixed in place or do you want to be able to move it around?
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Look here:
Off The Beaten Track & Recovery - Campervan Culture
campervanculture.com
They have some great gear. I think you'll be hard pressed to find a panel big enough to fit your windscreen completely but you can always prop it between the wind screen and the thermal sheet.
I assume that you'll be using it to trickle charge your main leisure battery whole you're static?
A moveable solar set up is more practical than one fixed to the roof as it allows you to position it facing the sun for maximum efficiency. A roof fixed panel isn't always getting full exposure and relies upon you having to always be conscious of where you park.....
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If you stick a solar panel behind glass the efficiency takes a nose dive.
Make sure you seal it down properly or water will get in & start to rust the vehicle..it’s a common thing.
Also, if you’re vehicle camping under trees.. what’s the point?
All good advice if you're at home, but not suitable for OPs needs. A hard panel is difficult to store in a van, as would be your recommended 30ft of cable.My solar panels are vertical on the south side of my house. They do not need hard, direct sunlight to function. That's a myth. They work better at -20C. Fact of physics. Vertical, they get washed but there's no snow load like there would be on my roof (never more that 4-5 feet deep).
Put your hard solar panel on a support on 30' of #8 wire and pick a sunny spot if you got one.
Remember: the solar panel is useless without batteries to store the juice. That's where your application power will come from.
I use pairs of 6VDC batteries in series for 12VDC since the plate area is the fact for storage capacity. Then, I gang sets of those together like steps in a ladder for enough 12VDC for welding.
Not really, I’ve met people moored up in the shadows & complained they have no power.You started off well with your first point.
Then over assumed on your second.