Checking GEM120CT Readings
Overview
After installation, verify that the GEM120CT is reading correctly by comparing inverter data.
Verification Steps
-
Switch off all PV generation (turn off PV breakers or disable via web portal).
In the GivEnergy Portal, navigate to:
Inverter → Remote Settings → Control → On/Off State → “Off / Auto Off”.
-
Return to the Data tab and check readings:
|
Measurement
|
Expected Sign
|
Description
|
|---|
|
PAC
|
Negative (–)
|
Indicates import from grid
|
|
Load Power
|
Positive (+)
|
Indicates supply to load |
If both values are equal in magnitude but opposite in sign, the CT orientation is correct.
Troubleshooting
|
Symptom
|
Cause
|
Fix
|
|---|
|
PAC shows positive during import
|
CT reversed
|
Re-orient clamp arrow toward load
|
|
No data on inverter
|
RS485 polarity reversed
|
Swap A/B wires
|
|
Irregular readings
|
CT wires extended
|
Replace with unmodified CT clamp |
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