The Homerun Combiner Box family was developed by a team of experienced engineers and electricians to reduce the cost and simplify the installation of PV systems. Not your average combiner box, the Homerun line is designed to be tough, weatherproof and easy to use. The HOMERUN combiner box is the #1 choice for top-shelf solar array designers and installers. This product line is UL Listed for safety as an inverter accessory to standard UL1741. An important aspect of the safety listing is the wide temperature testing range which ensures the product will safely deliver full power in the most extreme conditions. The HCB 4 enclosure is powder coated aluminum. The weather-sealed, hinged design allows for vertical or sloped mounting.