| Conduct all CT tests with at least 1 kW of power
flowing. |
| Ensure all solar inverters are monitored with
CTs. |
| When using only 1 CT for solar, select Solar (1CT x2) on
the Meter page during device setup. |
For each CT, select the applicable function on the
Current Transformers screen and perform the following steps to ensure it
is in the correct location and orientation:
- Adjust the
Amps/kW slider to see what the CTs are reading.
- Verify the
on-screen values for the CT against the applicable meter (such
as the solar inverter meter or utility meter).
- Ensure that:
- Site CTs
are positive for import, negative for export.
- Solar CTs
are positive when the PV array is producing power (Solar
is NEVER negative during daytime).
|
Negative power flow may indicate CT is installed on the
wrong phase!
- If the “toward
source” CT label is correctly facing the solar inverter but
power flow is negative, a voltage-current mismatch is likely.
- Physically move
the CT to the correct phase with the label facing the correct
direction. Do not use the Flip checkbox in this case.
|
| Solar CTs should only meter generation sources. It is
never recommended to meter both generation and loads using the Solar (1
CT x2) option. If it is absolutely necessary to install solar and a
small amount of loads together without independent metering, you must
install the solar CT on the phase without any downstream loads. |
| Use a handheld clamp or fork meter to verify CT
readings. |