How to Fuse a Solar Panel Array for a DIY Camper Electrical System
14 February 2021 · 7 min · 253K views
What this video covers
Determining whether to install inline fuses in a solar array depends on comparing the array's total short-circuit current against the maximum series fuse rating specified on the solar panel's nameplate.0:57 According to National Electric Code (NEC) 690.9, if the array's short-circuit current exceeds the panel's maximum series fuse rating, each parallel-connected panel or series string requires a fuse to prevent overheating or fire during an internal short.0:57 In such a fault, adjacent panels would otherwise feed current into the shorted panel, exceeding its rated capacity.3:19 If the array's short-circuit current remains below the panel's maximum series fuse rating, fuses provide no additional protection and are not required by code, though a dual-pole solar disconnect remains mandatory under NEC 690.15.2:14 Fuses must be sized to match the maximum series fuse rating listed on the panel's specification sticker.2:07
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