Since I got one of these displays recently.. and going through the learning curve.. I went back and marked key posts from the last year or so to help others. I skipped the older posts (2-3yrs old) just because of out dated information. If there is something you think that should be marked.. just let me know.
Also, for reference.. for at least @ddebuss 's builds.. I used a 5.5x2.5 dc barrel connector extension cord to power mine. Since I have the larger panels and the warning was to prepare for at least 10amps... I used the heaviest gauge I could find easily on amazon... a 12' 18awg cable - https://www.amazon.com/gp/product/B00M85BINI/ref=ppx_yo_dt_b_asin_title_o01_s00
I also wanted one with a right angle plug.. but could not find one easily.. and the one I found with 2.5mm plugs on both sides, is a bit larger than I wanted. Of course through all this you could use a solder style one too.. but I was just trying to find a plug-n-play option.. without much luck on amazon or ebay quickly.