For most installations, you will need to turn off the AC disconnect switch from the inverter to the main electrical panel and then the DC disconnect switch from the PV array to the combiner box. In this blog, EG4 Electronics explains what a PV disconnect is, why it's crucial for safety and maintenance, how it meets codes and standards, and examples of its importance in real-world situations. . I'm building a simple circuit to disconnect a 18V solar panel from a 12V SLA once the SLA is charged. eg I tested a simple zener (18V-12V = 4V @ 350mA = 1. 4W of heat) and it started to melt the plastic. You have a 100V SCC therefore you need a disconnect that is rated for at least 125V to be safe. Wiring will probably be 10AWF from the panels to the charge controller, if the charge controller will. .
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