EZ_livingyea but pay back time is longer. winter is sucky. best in early morning then. a panel that can be more safely left out all day (ie cope with rain) is all the more important so on poor days to get ya one charge cycle of your battery bank you need the hole day instead of good days where ya only need a hour or 2 depending on power bank size of course :) . its September but today has been very sunny where for the last few weeks of aug it was poor but now its back to a sunny month/weeks i suspect.
ive order a 14W etfe usb one from china aliexpress under £39. waiting for it still... https://www.aliexpress.com/item/Xionel-14W-ETFE-Solar-Charger-with-2-Port-USB-Charger-with-High-efficiency-Monocrystalline-Solar-Panel/32823143611.html
would love a lensunsolar drop for there 100w black folding etfe panel or 30w individual panels (mine shiped from uk or china by lensunsolar please. not from usa, that would be expense.)