SA-15K Install Guide and Owner Manual

August 19
th
, 2022 39
Limiter Sensors (CT Sensors)
CT Sensors enable Limited to Home mode (meter zero) and Peak Shaving mode. CT sensors also allow the system to
calculate loads powered upstream of the Grid Breaker in the home. If using multiple inverters or using a critical loads
panel, CT installation is recommended.
CT Sensor Install Location
• CT sensors should be installed on L1 and L2 (also L3 for parallel 3 phase) upstream of everything in the home
except for a Generator Transfer Switch, Knife Blade Disconnect or Bypass Transfer Switch (upstream of Main
Service Panel and Line-Side Tap – see Diagrams Section Pgs. 8-16).
CT Sensor Size
• Each inverter includes a pair of 1 3/8” CT sensors (fits up to 4/0 AWG service wires).
• We have 2” (> 4/0 AWG or Metal Busbars) sensors available for purchase if needed.
• Dimensions refer only to CT sensor hole size; contact Sales at [phone] Ext 1 to purchase larger sensors.
CT Sensor Wiring
• Wire CT sensor on L1 to pins 3 (white) and 4 (black).
• Wire CT sensor on L2 to pins 5 (white) and 6 (black).
• Twist the black and white wires for each sensor along the length of the run.
• If needed, you may extend the range using Shielded Cat 6 (use both twisted pair wires).
CT Sensor Direction
• There is an arrow embossed on the CT sensor housing to determine direction.
• Install pointing upstream to the service meter, EXCEPT in 3 phase installs where this
should be reversed.
Peak Shaving Mode
• Grid Peak Shaving is available with the CT sensors in the location described above and applicable direction.
CT Ratio
Set the CT ratio; the default value is 2000/1. DO NOT change this value unless you speak with technical support; 3
rd
Party
CT sensors require our permission not to void the warranty.
Parallel 120V/240V Split Phase Note
• Each inverter will come with a pair of CT sensors.
• Only install one pair and wire to the master inverter.
• Set the system to Limited to Home mode after CT installation for BEST operation.
Parallel 120V/208V 3 Phase Note
• Each inverter will come with a pair of CT sensors.
• Install only one sensor per phase, wire sensor for L1 and L2 to Phase A Master.
• Install the third sensor on L3 and wire to Phase B master pins 5 (+ white) and 6 (- Black).
• Point the arrow on the CT sensor downstream to the inverters (3 phase only).
CT Sensor Extension Example