Not really—no. Solar compacting trash bins are designed to harvest energy whenever light is available, not necessarily direct sunlight from dawn to dusk. Most units use a small solar panel to charge a battery, and that battery powers the compactor motor and sensors. On bright days, the panel can top up the battery fairly quickly; on cloudy days or in partial shade, it simply charges more slowly. As long as the bin gets some regular exposure to daylight and the battery has enough capacity, it can keep working through nights and short stretches of bad weather.
That said, placement matters a lot. A bin tucked under a deep building overhang or dense tree canopy may struggle, especially in winter or in cities with frequent overcast weather. Manufacturers usually recommend mounting panels where they can see the sky for a good part of the day—ideally facing south in the northern hemisphere—but “all-day direct sun” is not a hard requirement. Many urban bins also collect ambient light reflected from buildings and pavement.
The practical rule is: avoid heavy shade, keep the panel clean, and make sure the battery is healthy. Dust, bird droppings, and street grime can reduce charging more than a few hours of shade. If a location is truly dark most of the day, a solar compactor may not be the best fit unless it has a backup power option or a larger battery. So for most city installations, they don’t need direct sunlight all day—they need sensible siting and a little maintenance.