Series vs Parallel Solar Panel Connection: Which is Better and When?

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Deciding whether to connect your solar panels in parallel or in series is not an easy decision. This is a very boring but educational video about what you should consider and how to get the maximum effect from your solar panels.
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[@utubeape]

I have heard from another youtuber that even if you have 3 identical panels if one of them experiences a loss in sun input, for example some shade is cast one one of the panels in series it will reduce the output on the other 2 also.
My reason for investigating this is I am wondering whether it is better to have smaller panels connected in parallel on the back of a bike trailer than have one big panel, in case I am blocking some of the panel with my body as I ride.
What do you think?

[@ollelund]

That is right. If you think that one of the panels might be in the shade then parallel is better. In then you will only lose the production from the shaded system and not the whole system.
What solar panels are you using?

[@utubeape]

@@ollelund I have not bought any yet, but likely from amazon :
YINGGUANG 100Watt Flexible Solar Panel, Portable 18V Monocrystalline Solar Panel, 995 x 500 x 3 cm; 1.65 kg
The size is important because of it being behind me on a bike trailer not on a roof.
But I may bring onther the same size to have it working when I am at camp

[@ollelund]

What did you have to pay for that one?