Huawei SUN2000-600W-P Quick Manual page 6

The measurement precision of the PV string output resistance depends on the resistance setting
of the multimeter. Select the lowest resistance setting that can meet the measurement
requirements.
Common Exception Scenarios
3. Check that the optimizer input is properly connected, and connect the output power cables
to the optimizer. Measure the PV string resistance when the sunlight is sufficient.
Full Configuration of Optimizers
The probes are
reversely connected.
The measured value
R2 is less than the
resistance measured
when the probes are
correctly connected.
The optimizer input
is not connected:
1.1 kΩ < R1
5
The sunlight is weak:
1.1 kΩ < R1
The optimizer
output is connected
to the PV module
output:
1.1 kΩ < R1
PV string