enphase IQ System Controller 3M Quick Install Manual page 31

Section C - Wiring
Sequence 2: IQ Battery 5P → IQ Combiner 5/5C → IQ System Controller 3M → IQ Meter Collar
NOTE: The total length of CTRL wiring across the system
cannot exceed 250 feet to ensure the system operates as per
specifications.
WARNING: The drain wire should only be terminated on one end
of the control wiring between the system components, to prevent
ground loops.
Here is a table providing termination resistor locations for the above sequences:
C O N T R O L W I R I N G S E Q U E N C E
IQ Combiner 5/5C → IQ Battery(s) 5P → IQ System Controller 3M
IQ Battery(s) 5P → IQ Combiner 5/5C
IQ System Controller 3M quick install guide
→ IQ Meter Collar
→
IQ System Controller 3M → IQ MeterCollar
Always wire IQ Meter Collar to
top connector of
IQ System Controller 3M
since it contains 24 V source
for the IQ Meter Collar
T E R M I N AT I O N R E S I S TO R L O C AT I O N
• IQ Combiner 5/5C
• IQ Meter Collar
• IQ Meter Collar
• Last IQ Battery 5P in the daisy chain
31