enphase IQ System Controller 3 Quick Install Manual page 31

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Section C - Wiring
Sequence 1b: IQ Combiner 5/5C → IQ System Controller 3 → IQ Battery(s) 5P
(This is only applicable to IQ System Controller 3 where the third DER port can be
used for additional batteries)
NOTE: Total length of CTRL wiring across the system cannot
exceed 250 feet to ensure the system operates as per specifications.
Sequence 2: IQ Combiner 5/5C → IQ Battery(s) 5P → IQ System Controller 3/3G
NOTE: Total length of CTRL wiring across the system cannot
exceed 250 feet to ensure the system operates as per specifications.
IQ System Controller 3/3G Quick Install Guide
31

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