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Portable panels and the role of the owner
TLDR
Portable panels can be highly-productive and useful, but good results require owner discipline.
the hardware
Rated watts are rated watts; a 100w portable will make the same power as 100w mounted in a lab.
When framed panels are used as portables they are no different than any other panel. Suitcase and some standalone panels are often made of “flex” crystalline cells that break over time.1) CIGS or other film-based cells can flex.
Portables can outperform flat-mounted panels when they are
set out facing ~south
2) at seasonally-optimal
tilt in clear weather; or
moved throughout the day to optimally face the sun in clear weather. This can increase harvest over fixed tilt but requires frequent repositioning. To give you an idea, automated single-axis trackers that follow the sun automatically can increase yield over fixed tilt by 20-35%. Increases from occasional owner repositioning will be lower.
set out in the sun when the mounted solar needs to be shaded
owners not setting them out for whatever reason ←- the biggest issue
set out but fell/blew over face-down
set out in overhead shade or high grass shade
set out facing north (!!) {“as I write this there are two rigs in my line of sight with this unforced error.” - secessus} Note: setting out facing east or west can make sense if direct sun is only available in that direction, or if one is manually “tracking” the sun.
made of “flex” crystalline that breaks
loose dogs pissing on them