Electrical Connections
22 Installation Manual for Generac PWRCell Inverter
Connecting CTs to Multiple PWRcell Systems/
Inverters
When an installation has multiple PWRcell inverter
systems, either:
• Run a set of CTs for each inverter.
• Run a set of CTs to one inverter and then run a Cat
5 cable from the spare CT port within that inverter
to any CT port within another inverter.
When running separate sets of CTs for each inverter, the
load value displayed on each inverter screen will be the
total load measured by the CTs.
When daisy-chaining multiple inverters, the total
measured value is shared evenly across the inverters. In
other words, the load value measured and acted upon by
each inverter is inversely proportional to the number of
inverters seeing the signal.
Example: The CT measured load displayed on three
inverters which daisy chain the signal from the first
inverter to the second inverter and the second to the
third inverter, will be one-third of the total load seen.
NOTE: Daisy-chaining CTs across multiple inverters for
distributed load-share is most applicable when each
inverter has a battery attached. Otherwise, this
configuration may not be necessary or desirable.
To daisy-chain a CT signal:
1. Connect and calibrate a set of CTs to the first
inverter. See CT Calibration for more information.
2. Run a new Cat 5 cable between the spare CT
accessory port of the first inverter to either CT
accessory port on the second inverter.
NOTE: Running a new Cat 5 cable between inverter CT
ports prior to calibration in Step 1 may cause calibration
issues.
CT Calibration
•
Install CTs before powering ON the inverter.
• The inverter automatically detects CTs when
turned ON.
• Once CTs are detected, a utility pole symbol will
appear on the lower right corner of the home
screen power flow diagram. Verify operation by
noting power flow.
– To calibrate CTs, navigate to the inverter device
page, access the sub-menu, and select the Cali-
brate CTs option. When the CT calibration pro-
cess has been successfully completed, the
inverter LCD screen will provide feedback show-
ing ct cal success. Otherwise, the screen will
show ct cal = X, where the value of X can be
found in Table 5-11: Automatic Detection
Troubleshooting Table.
– CT2 must be connected to Line 2.
– CT3 must be connected to line 3 (for three phase
applications).
– All CTs must be orientated in the same relative
direction.
– In certain scenarios, additional setpoint modifi-
cations may need to be made. See Table 5-10:
CT Setpoints for more information.
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