Combiner boxes receive the output of multiple solar strings and consolidate them into a single feed that is then sent to an inverter. Combiners are generally required for larger commercial projects because residential installations typically have only two or three strings that connect directly to the inverter — although combiner boxes can make installation, maintenance and disconnecting a much easier task for residential installs, and combiners can include features like disconnect switches, rapid shutdown systems and monitoring solutions that are increasingly popular for projects of all types. Combiner boxes should be of high quality and optimally placed between the solar panels and the inverter for peak performance.

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