When we clean VectHor photovoltaic systems we observe an interesting pattern: the energy yield of VectHor increases with cleaning, but the change is much less noticeable than with conventional fixed tilt systems. An example is shown in the figure above. While the energy yield of the 30 degree fixed tilt system increases with cleaning by 4%, the VectHor system in the same location and with the same cleaning schedule only increases its energy yield by 1.4%. This is due to a number of factors. Most importantly the soiling of fixed tilt solar panels at tilt angles ranging from 10 to

Bifacial solar cells now hold more than 90% market share, and their origin traces back to the efforts of Antonio Luque around 1976. There were, admittedly, earlier precedents with designs very different from the one that dominates the market today: Mori’s patent describing contacts on faces perpendicular to the light-incident surfaces, interdigitated back-contact cells (which have limited bifaciality), and developments from the Soviet space program, which barely crossed international borders given the Cold War context. But before the efforts of Luque and his collaborators, the term “bifacial” did not exist in photovoltaic scientific literature. Who deserves the credit matters less

The price of solar panels has dropped from €3,320/kW in 2008 to under €100/kW by mid-2025. Prices began ticking up slightly in early 2026, with stabilization expected over the coming years. The price of solar panels is now a minor part of the total cost of an installation, which can range between €500 and €1,500/kW depending on location, size, and the solar technology chosen. The other components driving up an installation’s total cost are support structures, the necessary electronics, wiring, installation labor, and so on. In some cases — depending on electricity prices — the payback period can be under