Interesting parallel vs series video test

rjsurfer wrote:
It seems that panel manufacturers don't advertise the number of diodes and how there connected.

Sometimes hard to find.

For panels with diodes - A diode for every 2 cell rows is a clue: A 4x9 array (common 12V panel) would have 2 diodes while a 6x10 array (common 24V panel) would have 3 diodes. The reason is simple since the junction box area would have the minimum additional wiring for the bypass diodes.

With a actual panel remove the junction box cover and count the diodes (or missing diode locations).

2oldman wrote:
Seems those panels have no bypass diodes.

X2

I've plotted solar data that shows the positive effect of serial panels with bypass diodes and shade.

Solar Panels, Leafy Shadows and Bypass Diodes 3/6/15 Casa Grande

Solar and A Brief Encounter With Leafy Shade 6/17/15 Albuquerque

Good point.

It seems that panel manufacturers don't advertise the number of diodes and how there connected.

Ron W

Seems those panels have no bypass diodes.