CA Traveler wrote:
Watched the video above and I did't see any mention of bypass diodes. Did I miss something?
Also the power drop with one cell covered in serial suggests that the 12V panels do not have bypass diodes which is not uncommon for 12V panels.
In the video description he lists the components used. The panels are 200 watt 36 cell 5 busbar Hightec brand panels with diodes.
https://www.ebay.com/itm/1-200-Watt-12-Volt-Battery-Charger-Solar-Panel-Off-Grid-RV-Boat-200-watt-total/283431535074?hash=item41fdd601e2:g:y5wAAOSwwZtacRkO
My own grape solar 180 watt panels have them. My results echo that of the test in the video. Even my old Renogy 100 watt panels had diodes. Most quality solar panels have them, even 12v panels.