I am searching for a solar panel that will charge several power banks by Talent cell that I use for my CPAP. I bought a Flexsolar solar 60W panel first and have used it several times outside my house trying to charge and I can’t get any charge at all and it had really good reviews on YouTube. Does anyone have a solar panel that really works well for charging larger batteries?

I am interested in this as well. Also, has anyone found a solar panel that is reasonable in size?

Take a look at the Iris Technology P3 folding 62 watt, 12v solar panel. It is military grade. I do not own one but know someone who does and uses it for various things including laptops out in the hinterlands. A bit bulky but if you need to run a cpap for several hours that should easily do the trick. I think you can get them as "cheap" as $250.

I just use the Luci Pro 2.0. I have a few of them so I can recharge my phone a little. Then I just set them in the sun to recharge. That's one of the reasons I bring more than I need. That way I can drain one completely to charge my phone without worrying about recharging it during the day enough to use again at night.

Look at BougeRV
You are limited to it's output depending the cable connection you use.

https://www.bougerv.com/products/100w-fiberglass-foldable-solar-panel