Good Morning Wrenches, I am working through a design with existing PV and a proposed small battery bank backup. We are pairing existing IQ7As with the System Controller 3, and a single 5P battery. We are well above the 150% oversizing of PV to battery capacity that Enphase allows so I need to open some of my branch circuits when off-grid.
Is there a good reason not to use the grid side of the system (NO relays) to detect and open 2 of my branch circuits as opposed to using the aux relay contacts in the IQ System controller to open when off-grid? Is there ever a time when the System controller would bring the excess PV online? It seems cheaper and better to use the grid voltage to perform this logic to me but I may be missing something. Thanks for your input -- Mac Lewis *"Yo solo sé que no sé nada." -Sócrates*
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