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Willmall solar combiner boxes group the outputs of multiple PV strings, adding fusing and protection before the DC enters the inverter.
It groups the DC outputs of multiple PV strings, fuses each string, and provides a single protected feed to the inverter.
Fusing protects each string from reverse-fault current from other strings, isolating a faulty string rather than taking the whole array down.
It is mounted close to the array, usually outdoors, with a weather-resistant enclosure protecting the DC terminations.
Typical protection includes string fuses or circuit breakers and, where specified, DC surge protection.
Sizing matches the string voltage, number of inputs, and the rating of the combined DC output to the inverter.
