DC-distribution board for 3 strings solar panels without arrester

Solar systems that have three or more strings connected in parallel need to have each string protected by fuses. Systems that have less than three strings will not generate enough fault current to damage the solar panels. Normally there are two photovoltaic fuses connected on each string (+ and - pole), that protect solar panels from damage and eliminate any safety hazards. Fuses isolate the faulted string. The rest of solar system can continue to generate electricity.