Is there a measurable increase in the output of solar panels during the solar maximum?
The solar panels are by no means a measurement device. They are designed for efficiency and not for reproducibility of the result.
A particular panel can (and unfortunately, will) decrease its efficiency by 5..10% just because of aging during a single solar cycle. This alone will not allow you to see the solar cycle pattern even in space.
A solar panel's output depends on temperature. The derating coefficient is 0.3..0.5% per degree Celsius. The recent global trend is likely 0.3..0.4 degC per decade (and a solar cycle is almost a decade).
Wind patterns (and related dust in the air and over the panels, but also cooling), clouds, rain, number of sunny days per year - all these contribute to the variation of the power output.
The solar panel technology is constantly improving and we see ~2% increase in efficiency of the new panels every year or so.
As you see, there are quite a few factors that impact the solar electricity output power much more than these 0.05% variations in the solar luminosity.
Good luck finding it in the statistics.