Can you guesstimate panel watts?

50w

Jury-rig a load to take the panel (oriented mid day to full sun) to 12.0 volts. Measure load amperage. That is your usable panel power. Over in Michoacan I have a 500-watt 20 ohm Ohmite rheostat just for that purpose. (Thanks Lockheed surplus auction!)

To answer the question yes..
It will provide info we can compare with know panels
And give a good guesstimate

15 watt harbor freight special 12x36
getting 1 amp in full sun would be spectacular!

red31 wrote:
15 watt harbor freight special 12x36
getting 1 amp in full sun would be spectacular!

If s person were positioned on the equator of the planet Mercury

:E

Nope, the solder would melt.

MEXICOWANDERER wrote:

red31 wrote:
15 watt harbor freight special 12x36
getting 1 amp in full sun would be spectacular!

If s person were positioned on the equator of the planet Mercury

:E

speced 1A@15v
0.8 amp was not uncommon shorted, 31 degrees north, 96 west, earth

folks said it wouldn't help, folks be wrong!

Probably 50-60W. Is it covered in clear plastic or glass?

HF 15W is amorphous, those are less efficient per sq.ft. though more efficient in low light.

Either one isn't much more than a maintainer. I remember a 60W tilted panel on the roof of a rental cabana in winter Mexico. By the evening they could turn on LED string lights for a couple of hours. That's all.