All Solar Panel Diodes tested OK. What else can it be?

Firstly, thanks for watching until the end 😑. Secondly, I'm still ins search-mode with these panels. I'm trying to explain and show why it is not so easy to find this fault. Maybe there is no fault and it is just degradation? Nah, can't be. So, here is the last video with this stuff of measuring solar panels. OK, maybe the second last one... Please subscribe and join me on my journey of the Off-Grid Garage! For more information, please check out my website with links to all batteries, materials, devices and products: https://off-grid-garage.com New to AliExpress? Use my referral code below to register and earn US$19 store credit. What a great start! https://a.aliexpress.com/_mrtR9Ux The 'buy me a beer 🍻' link is here (scroll all the way down): https://off-grid-garage.com Thank you for your support! **** These are the batteries you are looking for **** 🔋➡EVE LF280 LiFePO4 cells 3.2V/280Ah: https://off-grid-garage.com/batteries/ 🌞➡Solar, Controllers, Inverters and accessories: https://off-grid-garage.com/solar/ 🔌➡Batteries, charger and accessories: https://off-grid-garage.com/batteries-3/ ⚡➡Cables, inverters and electronics: https://off-grid-garage.com/electronics/ 🔧➡Tools, analysers and testers: https://off-grid-garage.com/equipment/ Take a sneak peak at the Off-Grid-Garage in the Victron VRM World: https://vrm.victronenergy.com/install...