Dokio 100 Watt Panel

I got this at a local Ham flea market. I think I paid somewhere around $50 to $75 for it. For a 100 watt panel it was a decent price. As you can see it's a complete kit including the tot bag for transport. The charge controller is a basic PWM type. I would rather have had a MPPT one, but they are not commonly found due to the higher cost. People go cheap buying the PWM ones.

Larger solar panels seem to disappear quick at the flea markets during the April to May time frame. People buy them for use during "Field Day" in June.

I also have another 100 watt panel, 2 x 50 watt, 2 x 30 watt, 2 x 20 watt and a collection of 10/5 watt panels in addition to the one in the above photo.

The main application for the panels is for portable and or emergency power.

Some of the panels were purchased new and the rest were flea market finds.

The charge controllers are a collection of PWM and MPPT types for lead-acid or LFP, LiFePO4, battery pack types. One of the 20 watt used panels, which was heavy and had a thick frame with riveted back plate, I discovered later, has an integrated old style shut type charge controller for lead-acid batteries. The output voltage seemed to be low when I first tested it, based on the number of cells, so I suspected the panel might be defective.  It took a while of searching on the Internet before I found the equipment manual that panel was designed to charge up the battery and got the spec's. My measurements matched the manual spec's so it seems to be OK.