Always install the box in an upright, vertical position. The installation location of solar combiner box should be close to your PV modules to minimize cable length. Avoid areas prone to flooding, direct water spray, or extreme heat. Ensure compliance with IEC marking requirements and local authority preferences. As a device for connecting multiple sets of photovoltaic modules, the combiner box plays a crucial role in aggregating and uniformly. Let's explore the key considerations for determining where to place a solar combiner box: 1.