[RE-wrenches] PV shedding Enphase

[Mac Lewis]

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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