Depending on the region, the orientation, the possible masks that would create shadows, and the season, solar inputs to power photovoltaic cells are not the same. Areas that don't receive sunlight may be non-existent in the summer and can greatly impede solar gain in the winter, where the shadows are longer because the sun is low.
The inclination of the panel is also important, a 30% difference in solar energy input depending on the inclination of the panel can be lost, compared to the optimal inclination. In the US, on average in summer, the solar gains are sufficient regardless of the region. The difference becomes higher in the winter season with the north part of the country becoming colder than the south. Despite freezing winters, solar lights get enough Sun’s energy to work, so if you want to buy the best solar lights consumer reports, then you should buy it despite knowing that the winters are coming because those will work smoothly
How can solar lights work all year round?
To be able to take full advantage of the solar lighting in winter as wired lighting, it would be necessary that the power of the solar panels expressed in WC or Wp, the storage capacity of the battery as well as the power in W of the LEDs are closely related and correctly sized. This is rarely the case for ready-to-use finished products, as it would require over-sizing for the winter, and it depends on the region, depending on the solar gain, it is certain that at the equator, the closer of the sun, the problem is not the same.